US20130055466A1 - Methods and Compositions for Watermelon Firmness - Google Patents

Methods and Compositions for Watermelon Firmness Download PDF

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US20130055466A1
US20130055466A1 US13/600,612 US201213600612A US2013055466A1 US 20130055466 A1 US20130055466 A1 US 20130055466A1 US 201213600612 A US201213600612 A US 201213600612A US 2013055466 A1 US2013055466 A1 US 2013055466A1
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seq
watermelon
loci
nucleic acid
firm
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Benito Juarez
Joseph J. King
Eleni Bachlava
Adam M. Wentzell
Jeffrey M. Mills
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Seminis Vegetable Seeds Inc
Monsanto Technology LLC
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Monsanto Technology LLC
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Priority to US14/743,682 priority patent/US10036032B2/en
Priority to US14/886,955 priority patent/US11044860B2/en
Priority to US17/343,359 priority patent/US20210378195A1/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H5/00—Angiosperms, i.e. flowering plants, characterised by their plant parts; Angiosperms characterised otherwise than by their botanic taxonomy
    • A01H5/08—Fruits
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
    • C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
    • C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
    • C12Q1/6895—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms for plants, fungi or algae
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2600/00—Oligonucleotides characterized by their use
    • C12Q2600/13—Plant traits
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2600/00—Oligonucleotides characterized by their use
    • C12Q2600/156—Polymorphic or mutational markers
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q2600/00—Oligonucleotides characterized by their use
    • C12Q2600/158—Expression markers

Definitions

  • Watermelon [ Citrullus lanatus ], is an important commercial member of the Cucurbitaceae family.
  • the fruits display a wide range of coloring on the outside rind. Color in the edible tissue varies from different shades of red to orange to yellow to white. Additional variation in the marketplace can be found with both seeded and seedless types. Unlike the flesh coloring—which is caused by varying genetic loci—the distinction between seeded and seedless varieties is usually caused by varying the ploidy levels.
  • Diploid lines typically have the lowest flesh firmness levels. For reasons that are unclear, the process of changing a diploid line to a tetraploid line correlates with firmer fruit flesh, and thus, tetraploid lines usually have firmer fruit flesh than diploids. Triploids, being a cross between a tetraploid and a diploid, have an intermediate level of fruit firmness.
  • cut fruit displays In addition to offering convenience to the consumer, one advantage of cut fruit displays is that the consumer can visually inspect the quality of the fruit, and in particular, judge whether the fruit is mature and ready to consume. Often, immature fruits will not be uniform in pigmentation, and overripe fruit will display signs of decay.
  • Certain embodiments of the present invention provide for unique watermelon plants with an ultra-firm flesh phenotype and their progeny.
  • compositions and methods for producing, breeding, identifying, selecting, and the like of such plants or germplasm are provided.
  • Novel plants of the present invention comprise an introgressed allele locus—located in a genomic region flanked by loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18)—that is associated with the ultra-firm watermelon flesh phenotype.
  • an introgressed allele locus associated with an ultra-firm watermelon flesh phenotype is one flanked by:
  • the plants also comprise one or more polymorphic loci comprising alleles or combinations of alleles that are not found in an ultra-firm watermelon flesh variety and that are linked to the locus associated with an ultra-firm watermelon flesh phenotype.
  • the introgressed allele locus is introduced into a background different from that of a previously existing ultra-firm watermelon flesh variety.
  • the introgressed allele locus comprises at least one polymorphic nucleic acid selected from the group consisting of NW0248953 (SEQ ID NO: 2), NW0250301 (SEQ ID NO: 3), NW0248949 (SEQ ID NO: 4), NW0248646 (SEQ ID NO: 5), NW0249077 (SEQ ID NO: 6), NW0249132 (SEQ ID NO: 7), NW0252494 (SEQ ID NO: 8), NW0248163 (SEQ ID NO: 9), NW0252274 (SEQ ID NO: 10), NW0248905 (SEQ ID NO: 11), NW0251011 (SEQ ID NO: 12), NW0248869 (SEQ ID NO: 13), NW0251470 (SEQ ID NO: 14), NW0251308 (SEQ ID NO: 15), NW0250718 (SEQ ID NO: 16), and NW0248059 (SEQ ID NO: 17).
  • Certain embodiments provide for a method of identifying a watermelon plant with a genotype associated with an ultra-firm watermelon flesh phenotype. Such methods include detecting a genotype associated with an ultra-firm watermelon flesh phenotype in a watermelon plant. In certain embodiments a polymorphic nucleic acid is detected in a genomic region flanked by loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18), or in a sub-region thereof as described herein.
  • At least one polymorphic nucleic acid is selected from the group consisting of NW0248953 (SEQ ID NO: 2), NW0250301 (SEQ ID NO: 3), NW0248949 (SEQ ID NO: 4), NW0248646 (SEQ ID NO: 5), NW0249077 (SEQ ID NO: 6), NW0249132 (SEQ ID NO: 7), NW0252494 (SEQ ID NO: 8), NW0248163 (SEQ ID NO: 9), NW0252274 (SEQ ID NO: 10), NW0248905 (SEQ ID NO: 11), NW0251011 (SEQ ID NO: 12), NW0248869 (SEQ ID NO: 13), NW0251470 (SEQ ID NO: 14), NW0251308 (SEQ ID NO: 15), NW0250718 (SEQ ID NO: 16), and NW0248059 (SEQ ID NO: 17).
  • a watermelon plant that is identified having a genotype associated with an ultra-firm flesh watermelon phenotype can be denoted as comprising a genotype associated with an ultra-firm watermelon flesh phenotype.
  • a watermelon plant, such as a denoted watermelon plant, comprising a genotype associated with an ultra-firm watermelon flesh phenotype can then be selected from a population of plants.
  • Certain embodiments of the invention provide for a method of producing a watermelon plant having in its genome an introgressed locus associated with an ultra-firm watermelon flesh phenotype.
  • a watermelon plant lacking a locus associated with an ultra-firm watermelon flesh phenotype is crossed with a second watermelon plant that comprises: (a) an allele of at least one polymorphic nucleic acid that is associated with an ultra-firm watermelon flesh phenotype located in a genomic region flanked by loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18) (or in a sub-region thereof as described herein), and (b) at least one additional polymorphic locus located outside of the region that is not present in said first watermelon plant.
  • a population of watermelon plants segregating for the polymorphic locus that is associated with an ultra-firm watermelon flesh phenotype and the additional polymorphic locus is obtained.
  • the polymorphic locus that is associated with an ultra-firm watermelon flesh phenotype is detected in at least one watermelon plant of the population.
  • a watermelon plant can then be selected having the locus associated with an ultra-firm watermelon flesh phenotype that lacks the additional polymorphic locus, thereby obtaining a watermelon plant that comprises in its genome at least one introgressed allele of a polymorphic nucleic acid associated with a firm watermelon flesh phenotype.
  • At least one polymorphic nucleic acid is selected from the group consisting of NW0248953 (SEQ ID NO: 2), NW0250301 (SEQ ID NO: 3), NW0248949 (SEQ ID NO: 4), NW0248646 (SEQ ID NO: 5), NW0249077 (SEQ ID NO: 6), NW0249132 (SEQ ID NO: 7), NW0252494 (SEQ ID NO: 8), NW0248163 (SEQ ID NO: 9), NW0252274 (SEQ ID NO: 10), NW0248905 (SEQ ID NO: 11), NW0251011 (SEQ ID NO: 12), NW0248869 (SEQ ID NO: 13), NW0251470 (SEQ ID NO: 14), NW0251308 (SEQ ID NO: 15), NW0250718 (SEQ ID NO: 16), and NW0248059 (SEQ ID NO: 17).
  • Certain embodiments provide for a method of watermelon plant breeding. At least one watermelon that comprises at least one allele of a polymorphic nucleic acid that is genetically linked to a QTL that is flanked by loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18) and associated with an ultra-firm watermelon flesh phenotype is selected. This watermelon plant is then crossed with itself or a second watermelon plant to produce progeny watermelon plants that have the QTL associated with an ultra-firm watermelon flesh phenotype.
  • the at least one polymorphic nucleic acid that is genetically linked to the QTL is selected from the group consisting of NW0248953 (SEQ ID NO: 2), NW0250301 (SEQ ID NO: 3), NW0248949 (SEQ ID NO: 4), NW0248646 (SEQ ID NO: 5), NW0249077 (SEQ ID NO: 6), NW0249132 (SEQ ID NO: 7), NW0252494 (SEQ ID NO: 8), NW0248163 (SEQ ID NO: 9), NW0252274 (SEQ ID NO: 10), NW0248905 (SEQ ID NO: 11), NW0251011 (SEQ ID NO: 12), NW0248869 (SEQ ID NO: 13), NW0251470 (SEQ ID NO: 14), NW0251308 (SEQ ID NO: 15), NW0250718 (SEQ ID NO: 16), and NW0248059 (SEQ ID NO: 17).
  • Certain embodiments of the invention provide for a method of introgressing an allele into a watermelon plant.
  • a population of watermelon plants is provided from which at least one watermelon plant is genotyped with respect to at least one polymorphic nucleic acid located in a genomic region flanked by loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18).
  • At least one watermelon plant is then selected from the population wherein the watermelon plant has at least one allele associated with an ultra-firm watermelon flesh phenotype.
  • At least one polymorphic nucleic acid is selected from the group consisting of NW0248953 (SEQ ID NO: 2), NW0250301 (SEQ ID NO: 3), NW0248949 (SEQ ID NO: 4), NW0248646 (SEQ ID NO: 5), NW0249077 (SEQ ID NO: 6), NW0249132 (SEQ ID NO: 7), NW0252494 (SEQ ID NO: 8), NW0248163 (SEQ ID NO: 9), NW0252274 (SEQ ID NO: 10), NW0248905 (SEQ ID NO: 11), NW0251011 (SEQ ID NO: 12), NW0248869 (SEQ ID NO: 13), NW0251470 (SEQ ID NO: 14), NW0251308 (SEQ ID NO: 15), NW0250718 (SEQ ID NO: 16), and NW0248059 (SEQ ID NO: 17).
  • Certain embodiments of the invention provide for a watermelon plant obtained by any of the methods described herein capable of producing a watermelon plant such as by producing, breeding, introgressing, etc., or a progeny plant thereof.
  • Certain embodiments of the invention are drawn to a part of such a plant including, but not limited to pollen, an ovule, a leaf, an embryo, a root, a root tip, an anther, a flower, a fruit, a stem, a shoot, a seed, a protoplast, a cell, or a callus from the plant.
  • Certain embodiments of the invention are drawn to the seed of a watermelon plant obtained by any of the methods described herein capable of producing a watermelon plant such as by producing, breeding, introgressing, etc., or a seed of a progeny plant thereof.
  • Certain embodiments of the invention provide for an isolated nucleic acid probe or primer that hybridizes under conditions of 5 ⁇ SSC, 50% formamide, and at 42° C. to a nucleic acid sequence selected from the group consisting of SEQ ID NOs: 1-18 or a fragment thereof, that contains a specific allelic variant.
  • the probe or primer is at least 12 nucleotides in length.
  • Certain embodiments of the invention provide for an isolated oligonucleotide comprising a nucleic acid molecule selected from the group consisting of SEQ ID NOs: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18, and any specific allelic variants thereof.
  • Certain embodiments of the invention provide for an isolated oligonucleotide comprising a nucleic acid fragment of SEQ ID NOs: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18, that contains a specific allelic variant thereof and that is at least 12 nucleotides in length. Certain embodiments of the invention provide for an isolated oligonucleotide comprising a nucleic acid fragment of SEQ ID NOs: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18, that contains a specific allelic variant thereof, wherein the fragment that contains said allelic variant is at least 15, at least 18, at least 20, at least 22, at least 25, or at least 30 nucleotides in length.
  • FIG. 1 shows the distributions of firmness phenotypes in three environments tested (Woodland, Calif. Test Year 1 and Test Year 3; Tifton, Ga. Test Year 1).
  • FIG. 2 shows the major firmness QTL identified on linkage group 9 (of the genetic map of the 03LB3378-1 x WAS-35-2438 derived population) and co-localized QTL for Brix and lycopene content identified using QTL Cartographer. Black bars show the QTL curves correspond to the 2-LOD confidence intervals and white squares on each bar identify the QTL peaks.
  • FIG. 3 Major QTL for firmness identified on linkage group 9 using Rqtl.
  • A. The graph shows overlay of LOD curves of single-QTL genome scans conducted by three interval mapping methods (EM algorithm), Haley-Knott regression and multiple imputations for the 19 linkage groups of the 03LB3387 x WAS-35-2438 genetic map.
  • B. The heat plot corresponds to two-QTL genome scans and shows the main effect for firmness identified on linkage group 9 below the diagonal and the lack of two-locus epistatic interactions above the diagonal.
  • plant includes plant cells, plant protoplasts, plant cells of tissue culture from which watermelon plants can be regenerated, plant calli, plant clumps and plant cells that are intact in plants or parts of plants such as pollen, flowers, seeds, leaves, stems, and the like.
  • having a watermelon “ultra-firm flesh phenotype” means that the edible flesh of a watermelon measures at least about 3.5 pounds force (lb/F) of pressure as evaluated with a penetrometer by methods described herein.
  • a penetrometer is a device used to measure force, such as used to measure fruit firmness.
  • population means a genetically heterogenous collection of plants that share a common parental derivation.
  • variable means a group of similar plants that by their genetic pedigrees and performance can be identified from other varieties within the same species.
  • soluble solids means the percent of solid material found in the edible portion of the fruit. As used herein, soluble solids are measured quantitatively with a refractometer as degrees Brix. Brix is formally defined as weight percent sucrose: if the only soluble solid present in an aqueous solution is sucrose, an actual percentage sucrose will then be measured. However, if other soluble solids are present, as is almost always the case, the reading is not equal to the percentage sucrose, but approximates the overall percentage of soluble solids in the sample. In short, although Brix is technically defined as weight percent sucrose, those of skill in the art recognize that weight percent soluble solids, as obtained with a refractometer, approximate weight percent sucrose and accurately indicates sweetness. Therefore, the higher the percentage soluble solids, as indicated by degree Brix, the higher the perceived sweetness of the fruit.
  • an “allele” refers to one of two or more alternative forms of a genomic sequence at a given locus on a chromosome.
  • QTL Quality of Trait Locus
  • a “marker” means a detectable characteristic that can be used to discriminate between organisms. Examples of such characteristics include, but are not limited to, genetic markers, biochemical markers, metabolites, morphological characteristics, and agronomic characteristics.
  • phenotype means the detectable characteristics of a cell or organism that can be influenced by gene expression.
  • the term “genotype” means the specific allelic makeup of a plant.
  • Introgressed when used in reference to a genetic locus, refers to a genetic locus that has been introduced into a new genetic background. Intro gression of a genetic locus can thus be achieved through plant breeding methods and/or by molecular genetic methods.
  • molecular genetic methods include, but are not limited to, various plant transformation techniques and/or methods that provide for homologous recombination, non-homologous recombination, site-specific recombination, and/or genomic modifications that provide for locus substitution or locus conversion.
  • the term “linked,” when used in the context of nucleic acid markers and/or genomic regions, means that the markers and/or genomic regions are located on the same linkage group or chromosome.
  • the term “maturity” means maturity of fruit development. Maturity indicates the time a watermelon fruit is ready to be harvested. In watermelon, the maturity comes associated with changes in flesh color and sugar content.
  • the term “denoting” when used in reference to a plant genotype refers to any method whereby a plant is indicated to have a certain genotype. This includes any means of identification of a plant having a certain genotype. Indication of a certain genotype may include, but is not limited to, any entry into any type of written or electronic medium or database whereby the plant's genotype is provided. Indications of a certain genotype may also include, but are not limited to, any method where a plant is physically marked or tagged. Illustrative examples of physical marking or tags useful in the invention include, but are not limited to, a barcode, a radio-frequency identification (RFID), a label, or the like.
  • RFID radio-frequency identification
  • Certain embodiments of the present invention provide for watermelon plants comprising in their genome an introgressed allele locus associated with an ultra-firm watermelon flesh phenotype wherein the introgressed locus allele has not previously been introgressed into the genomic background of a specific variety or cultivar. Certain embodiments provide for methods of detecting in a watermelon plant a genotype associated with an ultra-firm flesh phenotype in a watermelon plant. Certain embodiments provide for methods of identifying and selecting a watermelon plant comprising in its genome a genotype associated with an ultra-firm flesh phenotype.
  • certain embodiments provide for methods of producing a watermelon plant that comprises in its genome at least one introgressed locus associated with an ultra-firm flesh phenotype and methods for introgressing such an allele into a watermelon plant.
  • Watermelon plants and parts thereof made by any of said methods are also provided for in certain embodiments of the invention as well as polymorphic nucleic acid sequences.
  • markers to infer a phenotype of interest results in the economization of a breeding program by substituting costly, time-intensive phenotyping assays with genotyping.
  • breeding programs can be designed to explicitly drive the frequency of specific favorable phenotypes by targeting particular genotypes (U.S. Pat. No. 6,399,855). Fidelity of these associations may be monitored continuously to ensure maintained predictive ability and, thus, informed breeding decisions (U.S. Patent Pub. No. 2005/0015827).
  • Successful watermelon production depends on attention to various horticultural practices. These include soil management with special attention to proper fertilization, crop establishment with appropriate spacing, weed control, the introduction of bees for pollination, irrigation, pest management, and if producing fruit from triploid plants, a suitable pollen source for producing seedless (triploid) watermelon.
  • Watermelon fruit size and shape, rind color, thickness and toughness, seed size, color, and number, flesh color, texture, and sugar content, and freedom from fruit defects are all important characteristics to be considered in selection of watermelon varieties.
  • Commercial seed companies typically offer the grower the opportunity to observe these criteria in demonstration plots of their varieties, and some Agricultural Universities provide cultivar analysis data to the local growers (Roberts et al. (2004), Maynard and Sidoti (2003), Schultheis and Thompson (2004), and Leskovar et al. (2004).
  • Watermelon crops can be established from seed or from transplants. Transplanting has become more common because transplanting can result in an earlier crop compared with a crop produced from direct seeding. When a grower wants to raise a seedless fruited crop, transplanting is preferred. Transplanting helps achieve complete plant stands rapidly, especially where higher seed costs, as with triploid seeds, make direct-seeding risky.
  • Watermelon is the only economically important cucurbit with pinnatifid (lobed) leaves; all of the other species have whole (non-lobed) leaves.
  • Watermelon growth habit is a trailing vine.
  • the stems are thin, hairy, angular, grooved, and have branched tendrils at each node.
  • the stems are highly branched and up to 30 feet long (Wehner et al. In: Watermelons: Characteristics, Production and Marketing. Maynard, editor. ASHS Press, Alexandria, Va. (2001)).
  • Watermelon breeders are challenged with anticipating changes in growing conditions, new pathogen pressure, and changing consumer preferences. With these projections, a breeder will attempt to create new cultivars that will fit the developing needs of growers, shippers, retailers, and consumers. Thus, the breeder is challenged to combine in a single genotype as many favorable attributes as possible for good growing distribution and eating.
  • Fruit size is an important consideration because there are different market requirements for particular groups of shippers and consumers.
  • the general categories are: icebox ( ⁇ 12 lb), small (12-18 lb), medium (18-24 lb), large (24-32 lb), and giant (>32 lb).
  • Fruit size is inherited in polygenic fashion, with an estimated 25 genes involved.
  • Fruit is distributed from the grower to the retailer by shippers, who focus with particular weight categories, such as 18-24 lb for seeded and 14-18 lb for seedless.
  • weight categories such as 18-24 lb for seeded and 14-18 lb for seedless.
  • Fruit flesh firmness is another important characteristic. Consumers have varying textural preferences for watermelon fruit, and flesh firmness is correlated with texture. Additionally, fruit firmness is a critical parameter that determines how long cut fruit will last on the retailer's shelf. Cut fruit shelf life research is usually qualitative, with evaluations on when the fruit becomes “slimy” (Perkins-Veazie et al. 1998 HortScience 33:605). A more quantitative evaluation of cut fruit shelf life is to measure the flesh firmness directly using a penetrometer and/or the liquid purge from the cut fruit.
  • Watermelons with firmer flesh have increased field holding, allowing growers to harvest less frequently and/or harvest fruit at a more mature stage (85-95% maturity versus 70% of current market standard). They retain water, nutrients, and flavor during processing; thus having a higher fresh cut yield for processors, lower purge, and longer shelf-life for retailers and consumers.
  • Current marketed watermelon products typically have a firmness of about 2 lb/F, while watermelons with an ultra-firm flesh phenotype have edible flesh that resists a pressure of at least 3.5 lb/F.
  • Table 1 shows flesh firmness data from commercial hybrids and inbred lines.
  • QTL quantitative trait locus
  • SNP single nucleotide polymorphism
  • Table 2 shows flesh firmness and sugar content from inbred line PI296341, and other various inbred lines created from PI296341 (see U.S. patent application Ser. No. 12/856,286 which is incorporated herein by reference).
  • PI29634 is resistant to Fusarium wilt, race 2 pathogen ( Fusarium oxysporum ), and is characterized by having very small round fruits between about 4 and about 6 inches in diameter and weighing between about 1 and about 2.6 pounds. Its fruit flesh is white, very firm, and having low sugars. Organoleptic evaluations of these fruits range from no perception of sweetness to bitter.
  • cultiva type For most breeding objectives, commercial breeders work within germplasm that is often referred to as the “cultivated type.” This germplasm is easier to breed with because it generally performs well when evaluated for horticultural performance.
  • the performance advantage the cultivated type provides is sometimes offset by a lack of allelic diversity. This is the tradeoff a breeder accepts when working with cultivated germplasm—better overall performance, but a lack of allelic diversity. Breeders generally accept this tradeoff because progress is faster when working with cultivated material than when breeding with genetically diverse sources.
  • the plant introduction accessions are typically lines that produce fruits with undesirable production and eating qualities. Even though these lines have poor horticultural qualities, some watermelon breeders, like some other crop breeders, attempt to breed with these PI lines because they potentially contain novel alleles. To date, the most commonly attempted breeding objective for use of the PI lines is to introgress new disease resistance genes. The process of introgressing novel resistance genes from the PI lines into acceptable commercial types is a long and often arduous process. This process can be difficult because the trait may be polygenic, or have low heritability, or have linkage drag or some combination thereof.
  • phenotypes are determined by the genotype at one locus. These simple traits, like those studied by Gregor Mendel, fall in discontinuous categories such as green or yellow seeds. Most variation observed in nature, however, is continuous, like yield in field corn, or human blood pressure. Unlike simply inherited traits, continuous variation can be the result of polygenic inheritance. Loci that affect continuous variation are referred to as quantitative trait loci (QTLs). Variation in the phenotype of a quantitative trait is the result of the allelic composition at the QTLs and the environmental effect. The heritability of a trait is the proportion of the phenotypic variation attributed to the genetic variance. This ratio varies between 0 and 1.0. Thus, a trait with heritability near 1.0 is not greatly affected by the environment. Those skilled in the art recognize the importance of creating commercial lines with high heritability horticultural traits because these cultivars will allow growers to produce a crop with uniform market specifications.
  • Minimally processed watermelon has a short shelf life of 2 to 3 days (Perkins-Veazie et al. (1998) Hortscience 33:605; Wehner et al. in: Watermelons: Characteristics, Production and Marketing. Maynard, editor. ASHA Press, Alexandria, Va. (2001)). Although the maximum shelf life of cut watermelon fruit is only a few days, product quality begins to deteriorate rapidly after being processed. In cut products presented in plastic food containers, the consumer can see this rapid deterioration because liquid will leak out of the cut products and accumulate in the bottom of the container.
  • Water leakage (also referred to as purge), can be evaluated using the following water retention test. The test is performed at 4° C. To measure liquid loss, the edible portion of the fruits were cut into approximately 1′′ cubes and weighed. The cube size was chosen because it best approximates the processed product size found in retail outlets. Over a 16 day period, solid samples are re-weighed, and the liquid loss is estimated by calculating the percent weight loss.
  • the cut flesh from the fruit of a watermelon of the invention with a genotype associated with an ultra-firm flesh phenotype loses less than about four percent water after three days storage at 4° centigrade.
  • the cut flesh from the fruit of a watermelon of the invention with a genotype associated with an ultra-firm flesh phenotype loses less than about three percent or less than about two percent water after three days storage at 4° centigrade. Watermelon fruit that retain liquid when cut will achieve a longer period of consumer acceptability after processing in the minimally processed watermelon market.
  • genomic region located at the proximal end of watermelon linkage group 9 (of the genetic map of the 03LB3378-1 x WAS-35-2438 population) and flanked by loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18).
  • NW0251464 SEQ ID NO: 1
  • NW0250266 SEQ ID NO: 18
  • a major watermelon flesh firmness QTL was found to be located within this region.
  • Certain of the various embodiments of the invention utilize a QTL or polymorphic nucleic acid marker or allele located in this genomic region. Subregions of this genomic region associated with an ultra-firm watermelon flesh phenotype can be described as being flanked by:
  • Certain of the various embodiments of the invention utilize a QTL or polymorphic nucleic acid marker or allele located in one or more of these subregions.
  • Polymorphic nucleic acid markers located within the region flanked by loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18) include, but are not limited to: NW0248953 (SEQ ID NO: 2), NW0250301 (SEQ ID NO: 3), NW0248949 (SEQ ID NO: 4), NW0248646 (SEQ ID NO: 5), NW0249077 (SEQ ID NO: 6), NW0249132 (SEQ ID NO: 7), NW0252494 (SEQ ID NO: 8), NW0248163 (SEQ ID NO: 9), NW0252274 (SEQ ID NO: 10), NW0248905 (SEQ ID NO: 11), NW0251011 (SEQ ID NO: 12), NW0248869 (SEQ ID NO: 13), NW0251470 (SEQ ID NO: 14), NW0251308 (SEQ ID NO: 15), NW0250718 (SEQ ID NO: 16), and NW0248059 (SEQ ID NO:
  • markers are believed to be associated with the ultra-firm watermelon flesh phenotype because of their location and proximity to the major firmness QTL.
  • Certain of the various embodiments of the invention utilize one or more polymorphic nucleic acids selected from this group. In certain embodiments, at least two of such markers are used.
  • the peak of the QTL was found to be in close proximity to at least NW0249132 (SEQ ID NO: 7), NW0248163 (SEQ ID NO: 9), NW0251011 (SEQ ID NO: 12), and NW0250266 (SEQ ID NO:18).
  • NW0250301 SEQ ID NO: 3
  • NW0248646 SEQ ID NO: 5
  • NW0252274 SEQ ID NO:10
  • At least one polymorphic nucleic acid selected from the group consisting of NW0250301 (SEQ ID NO: 3), NW0248646 (SEQ ID NO: 5), and NW0252274 (SEQ ID NO: 10) is used.
  • at least two polymorphic nucleic acids selected from this group are used.
  • at least all three of NW0250301 (SEQ ID NO: 3), NW0248646 (SEQ ID NO: 5), and NW0252274 (SEQ ID NO: 10) are used.
  • a watermelon plant has an allelic state that is associated with an ultra-firm flesh phenotype (Table 3). In certain other embodiments, it is useful to detect in, or determine whether, a watermelon plant has an allelic state that is not associated with an ultra-firm flesh phenotype (Table 3) (The position of the polymorphic site identified in Table 3 for each of these marker sequences is contained in Table 6 and the accompanying Sequence Listing).
  • a plant is identified in which at least one allele at a polymorphic locus associated with an ultra-firm watermelon flesh phenotype is detected.
  • a diploid plant in which the allelic state at a polymorphic locus comprises one allele associated with an ultra-firm watermelon flesh phenotype and one allele that is not associated with an ultra-firm flesh phenotype (i.e., heterozygous at that locus).
  • a triploid or tetraploid watermelon plant in which the allelic state at a locus comprises at least one allele associated with an ultra-firm watermelon flesh phenotype wherein other alleles of the locus may or may not also be an allele associated with an ultra-firm watermelon flesh phenotype.
  • Non-limiting exemplary examples include identifying a plant that: has at least one allele of the C allelic state of the polymorphic nucleic acid of NW0252274 (SEQ ID NO: 10); has at least one allele of the C allelic state of the polymorphic nucleic acid of NW0248646 (SEQ ID NO: 5); or has at least one allele of the G allelic state of the polymorphic nucleic acid of NW0250301 (SEQ ID NO: 3); any combination of two of these allelic states, or comprising all three.
  • Certain embodiments include identifying a watermelon plant that: is a diploid plant having one allele of the C allelic state of the polymorphic nucleic acid of NW0252274 (SEQ ID NO: 10) and one allele of the T allelic state of the polymorphic nucleic acid of NW0252274 (SEQ ID NO: 10); is a diploid plant having one allele of the C allelic state of the polymorphic nucleic acid of NW0248646 (SEQ ID NO: 5) and one allele of the A allelic state of the polymorphic nucleic acid of NW0248646 (SEQ ID NO: 5); or is a diploid plant having one allele of the G allelic state of the polymorphic nucleic acid of NW0250301 (SEQ ID NO: 3) and one allele of the A allelic state of the polymorphic nucleic acid of NW0250301 (SEQ ID NO: 3); any combination of two of these allelic states, or comprising all three.
  • One of skill in the art will also recognize that it can be useful to identify at a genetic locus a polymorphic nucleic acid marker that is not associated with an ultra-firm watermelon flesh phenotype in a plant, such as when introgressing a QTL associated with an ultra-firm watermelon flesh phenotype into a genetic background not associated with such a phenotype.
  • a plant is identified in which at least two alleles associated with an ultra-firm watermelon flesh phenotype at a locus are detected.
  • a diploid plant in which both allelic states at a polymorphic locus are associated with an ultra-firm watermelon flesh phenotype (i.e., homozygous at that locus).
  • a triploid or tetraploid watermelon plant in which the allelic state comprises at least two alleles at a locus that are associated with an ultra-firm watermelon flesh phenotype, wherein other alleles at the locus may or may not also be an allele associated with an ultra-firm watermelon flesh phenotype.
  • Certain non-limiting exemplary examples include identifying: a diploid watermelon plant that has the CC allelic state of the polymorphic nucleic acid of NW0248646 (SEQ ID NO: 5); a diploid watermelon plant that has the CC allelic state of the polymorphic nucleic acid of NW0248646 (SEQ ID NO: 5); or a diploid watermelon plant that has the GG allelic state of the polymorphic nucleic acid of NW0250301 (SEQ ID NO: 3); any combination of two of these allelic states, or the plant comprises all three.
  • markers and allelic states are exemplary. From Table 3, one of skill in the art would recognize how to identify watermelon plants with other polymorphic nucleic acid markers and allelic states thereof related to watermelon firmness consistent with the present invention. One of skill the art would also know how to identify the allelic state of other polymorphic nucleic acid markers located in the genomic region(s) or linked to the QTL or other markers identified herein, to determine their association with watermelon firmness.
  • Allele 1 Allele 2 SEQ ID Linkage Genetic Map (non-firm (ultra-firm flesh phenotype Marker Name NO: Group position (cM) flesh) QTL-associated) NW0251464 1 2 122.4666304 A or G deletion, absence of allele NW0248953 2 2 131.6920961 A T NW0250301 3 2 134.2525663 A G NW0248949 4 2 136.2284633 G A NW0248646 5 2 136.9855946 A C NW0249077 6 2 136.9855946 A or C deletion, absence of allele NW0249132 7 2 136.9920737 T or C deletion, absence of allele NW0252494 8 2 137.6844216 T or C deletion, absence of allele NW0248163 9 2 138.2842599 A or C deletion, absence of allele NW0248163 9 2 138.2842599 A or C deletion, absence of allele NW0248163 9 2 138.2842599 A or C
  • watermelons are natural diploids, having their chromosomes arranged in pairs. Watermelon plants, however, can undergo a duplication of their entire set of chromosomes and exist as tetraploids. While it is uncommon for watermelons to produce spontaneous tetraploids, this process can be routinely produced in the laboratory using cell biology techniques. Triploid seeds can be produced by crossing a tetraploid parent by a diploid parent. When triploid plants are grown, seed formation in the fruit aborts because of the ploidy level differences, resulting in seedless fruits.
  • a male parent diploid plant is homozygous for the QTL or a polymorphic nucleic acid marker allele associated with the firm watermelon flesh phenotype.
  • the male parent diploid is crossed with a female tetraploid lacking the QTL or a polymorphic nucleic acid marker allele associated with the firm watermelon flesh phenotype, to produce triploid hybrid progeny. This results in one copy of the QTL or polymorphic marker allele associated with the firm watermelon flesh phenotype (from the diploid parent) and two non-QTL/marker alleles (from the tetraploid parent) in the triploid hybrid.
  • Certain embodiments of the invention contemplate the use of dihaploidization to produce an inbred line.
  • a haploid plant has only one copy of each chromosome instead of the normal pair of chromosomes in a diploid plant.
  • Haploid plants can be produced, for example, by treating with a haploid inducer.
  • Haploids plants can be subjected to treatment that causes the single copy chromosome set to double, producing a duplicate copy of the original set.
  • the resulting plant is termed a “double-haploid” and contains pairs of chromosomes that are generally in a homozygous allelic state at any given locus.
  • Dihaploidization can reduce the time required to develop new inbred lines in comparison to developing lines through successive rounds of backcrossing.
  • a homozygous allelic state is represented as AA, CC, GG, or TT, where the designated polymorphic position of the allele comprises alternate nucleotide bases.
  • a homozygous allelic state is represented as DD, where the designated polymorphic position of the allele comprises a deletion of one or more bases in comparison to an alternate allele.
  • genomic regions identified may be used in certain embodiments of the methods of the invention.
  • additional markers located either within or near this genomic region that are associated with the phenotype can be obtained by typing new markers in various germplasm.
  • the genomic region, QTL, and polymorphic markers identified herein can also be mapped relative to any publically available physical or genetic map to place the region described herein on such map.
  • polymorphic nucleic acids that are genetically linked to the QTL associated with a firm watermelon flesh phenotype and that map within 40 cM, 20 cM, 10 cM, 5 cM, or 1 cM of the QTL associated with a firm watermelon flesh phenotype may also be used.
  • unique watermelon germplasms or watermelon plants comprising an introgressed genomic region that is associated with a firm watermelon flesh phenotype and method of obtaining the same.
  • Marker-assisted introgression involves the transfer of a chromosomal region, defined by one or more markers, from one germplasm to a second germplasm.
  • Offspring of a cross that contain the introgressed genomic region can be identified by the combination of markers characteristic of the desired introgressed genomic region from a first germplasm (e.g., a firm watermelon flesh phenotype germplasm) and both linked and unlinked markers characteristic of the desired genetic background of a second germplasm.
  • Flanking markers that identify a genomic region associated with a firm watermelon flesh phenotype are loci NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18), and those that identify sub-regions thereof include, but are not limited to:
  • Flanking markers that fall on both the telomere proximal end and the centromere proximal end (such as those provided herein) of any of these genomic intervals may be useful in a variety of breeding efforts that include, but are not limited to, introgression of genomic regions associated with an ultra-firm watermelon flesh phenotype into a genetic background comprising markers associated with germplasm that ordinarily contains a genotype associated with a non-firm flesh phenotype. Markers that are linked and either immediately adjacent or adjacent to the identified ultra-firm watermelon flesh phenotype QTL that permit introgression of the QTL in the absence of extraneous linked DNA from the source germplasm containing the QTL are provided herewith.
  • telomere proximal or centromere proximal markers that are immediately adjacent to a larger genomic region comprising the QTL can be used to introgress that smaller genomic region.
  • Watermelon plants or germplasm comprising an introgressed region that is associated with an ultra-firm watermelon flesh phenotype wherein at least 10%, 25%, 50%, 75%, 90%, or 99% of the remaining genomic sequences carry markers characteristic of plant or germplasm that otherwise or ordinarily comprise a genomic region associated with an non-ultra-firm flesh phenotype, are thus provided. Furthermore, watermelon plants comprising an introgressed region where closely linked regions adjacent and/or immediately adjacent to the genomic regions, QTL, and markers provided herewith that comprise genomic sequences carrying markers characteristic of watermelon plants or germplasm that otherwise or ordinarily comprise a genomic region associated with the phenotype are also provided.
  • Genetic markers that can be used in the practice of the present invention include, but are not limited to, Restriction Fragment Length Polymorphisms (RFLP), Amplified Fragment Length Polymorphisms (AFLP), Simple Sequence Repeats (SSR), Single Nucleotide Polymorphisms (SNP), Insertion/Deletion Polymorphisms (Indels), Variable Number Tandem Repeats (VNTR), and Random Amplified Polymorphic DNA (RAPD), and others known to those skilled in the art. Marker discovery and development in crops provides the initial framework for applications to marker-assisted breeding activities (U.S. Patent Pub.
  • the resulting “genetic map” is the representation of the relative position of characterized loci (polymorphic nucleic acid markers or any other locus for which alleles can be identified) to each other.
  • polymorphic markers serve as a useful tool for fingerprinting plants to inform the degree of identity of lines or varieties (U.S. Pat. No. 6,207,367). These markers form the basis for determining associations with phenotypes and can be used to drive genetic gain.
  • polymorphic nucleic acids can be used to detect in a watermelon plant a genotype associated with a firm watermelon flesh phenotype, identify a watermelon plant with a genotype associated with a firm watermelon flesh phenotype, and to select a watermelon plant with a genotype associated with a firm watermelon flesh phenotype.
  • polymorphic nucleic acids can be used to produce a watermelon plant that comprises in its genome an introgressed locus associated with a firm watermelon flesh phenotype. In certain embodiments of the invention, polymorphic nucleic acids can be used to breed progeny watermelon plants comprising a locus associated with a firm watermelon flesh phenotype.
  • Certain genetic markers useful in the present invention include “dominant” or “codominant” markers. “Codominant” markers reveal the presence of two or more alleles (two per diploid individual). “Dominant” markers reveal the presence of only a single allele. The presence of the dominant marker phenotype (e.g., a band of DNA) is an indication that one allele is present in either the homozygous or heterozygous condition. The absence of the dominant marker phenotype (e.g., absence of a DNA band) is merely evidence that “some other” undefined allele is present. In the case of populations where individuals are predominantly homozygous and loci are predominantly dimorphic, dominant and codominant markers can be equally valuable. As populations become more heterozygous and multiallelic, codominant markers often become more informative of the genotype than dominant markers.
  • Nucleic acid-based analyses for determining the presence or absence of the genetic polymorphism can be used in breeding programs for identification, selection, intro gression, and the like.
  • a wide variety of genetic markers for the analysis of genetic polymorphisms are available and known to those of skill in the art. The analysis may be used to select for genes, portions of genes, QTL, alleles, or genomic regions that comprise or are linked to a genetic marker that is linked to or associated with a firm watermelon flesh phenotype.
  • nucleic acid analysis methods include, but are not limited to, PCR-based detection methods (for example, TaqMan assays), microarray methods, mass spectrometry-based methods and/or nucleic acid sequencing methods, including whole genome sequencing.
  • the detection of polymorphic sites in a sample of DNA, RNA, or cDNA may be facilitated through the use of nucleic acid amplification methods.
  • Such methods specifically increase the concentration of polynucleotides that span the polymorphic site, or include that site and sequences located either distal or proximal to it.
  • Such amplified molecules can be readily detected by gel electrophoresis, fluorescence detection methods, or other means.
  • PCR polymerase chain reaction
  • Polymorphisms in DNA sequences can be detected or typed by a variety of effective methods well known in the art including, but not limited to, those disclosed in U.S. Pat. Nos. 5,468,613, 5,217,863; 5,210,015; 5,876,930; 6,030,787; 6,004,744; 6,013,431; 5,595,890; 5,762,876; 5,945,283; 5,468,613; 6,090,558; 5,800,944; 5,616,464; 7,312,039; 7,238,476; 7,297,485; 7,282,355; 7,270,981 and 7,250,252 all of which are incorporated herein by reference in their entireties.
  • compositions and methods of the present invention can be used in conjunction with any polymorphism typing method to type polymorphisms in genomic DNA samples.
  • genomic DNA samples used include but are not limited to genomic DNA isolated directly from a plant, cloned genomic DNA, or amplified genomic DNA.
  • polymorphisms in DNA sequences can be detected by hybridization to allele-specific oligonucleotide (ASO) probes as disclosed in U.S. Pat. Nos. 5,468,613 and 5,217,863.
  • ASO allele-specific oligonucleotide
  • U.S. Pat. No. 5,468,613 discloses allele specific oligonucleotide hybridizations where single or multiple nucleotide variations in nucleic acid sequence can be detected in nucleic acids by a process in which the sequence containing the nucleotide variation is amplified, spotted on a membrane and treated with a labeled sequence-specific oligonucleotide probe.
  • Target nucleic acid sequence can also be detected by probe ligation methods as disclosed in U.S. Pat. No. 5,800,944 where sequence of interest is amplified and hybridized to probes followed by ligation to detect a labeled part of the probe.
  • Microarrays can also be used for polymorphism detection, wherein oligonucleotide probe sets are assembled in an overlapping fashion to represent a single sequence such that a difference in the target sequence at one point would result in partial probe hybridization (Borevitz et al., Genome Res. 13:513-523 (2003); Cui et al., Bioinformatics 21:3852-3858 (2005).
  • target sequences On any one microarray, it is expected there will be a plurality of target sequences, which may represent genes and/or noncoding regions wherein each target sequence is represented by a series of overlapping oligonucleotides, rather than by a single probe.
  • This platform provides for high throughput screening of a plurality of polymorphisms. Typing of target sequences by microarray-based methods is disclosed in U.S. Pat. Nos. 6,799,122; 6,913,879; and 6,996,476.
  • Target nucleic acid sequence can also be detected by probe linking methods as disclosed in U.S. Pat. No. 5,616,464, employing at least one pair of probes having sequences homologous to adjacent portions of the target nucleic acid sequence and having side chains which non-covalently bind to form a stem upon base pairing of the probes to the target nucleic acid sequence. At least one of the side chains has a photoactivatable group which can form a covalent cross-link with the other side chain member of the stem.
  • SBE methods include single base extension (SBE) methods.
  • SBE methods include, but are not limited, to those disclosed in U.S. Pat. Nos. 6,004,744; 6,013,431; 5,595,890; 5,762,876; and 5,945,283.
  • SBE methods are based on extension of a nucleotide primer that is adjacent to a polymorphism to incorporate a detectable nucleotide residue upon extension of the primer.
  • the SBE method uses three synthetic oligonucleotides. Two of the oligonucleotides serve as PCR primers and are complementary to sequence of the locus of genomic DNA which flanks a region containing the polymorphism to be assayed.
  • the PCR product is mixed with the third oligonucleotide (called an extension primer) which is designed to hybridize to the amplified DNA adjacent to the polymorphism in the presence of DNA polymerase and two differentially labeled dideoxynucleosidetriphosphates. If the polymorphism is present on the template, one of the labeled dideoxynucleosidetriphosphates can be added to the primer in a single base chain extension. The allele present is then inferred by determining which of the two differential labels was added to the extension primer. Homozygous samples will result in only one of the two labeled bases being incorporated and thus only one of the two labels will be detected. Heterozygous samples have both alleles present, and will thus direct incorporation of both labels (into different molecules of the extension primer) and thus both labels will be detected.
  • an extension primer the third oligonucleotide
  • SNPs and Indels can be detected by methods disclosed in U.S. Pat. Nos. 5,210,015; 5,876,930; and 6,030,787 in which an oligonucleotide probe having a 5′ fluorescent reporter dye and a 3′ quencher dye covalently linked to the 5′ and 3′ ends of the probe.
  • an oligonucleotide probe having a 5′ fluorescent reporter dye and a 3′ quencher dye covalently linked to the 5′ and 3′ ends of the probe.
  • the proximity of the reporter dye to the quencher dye results in the suppression of the reporter dye fluorescence, e.g. by Forster-type energy transfer.
  • the locus or loci of interest can be directly sequenced using nucleic acid sequencing technologies.
  • Methods for nucleic acid sequencing are known in the art and include technologies provided by 454 Life Sciences (Branford, Conn.), Agencourt Bioscience (Beverly, Mass.), Applied Biosystems (Foster City, Calif.), LI-COR Biosciences (Lincoln, Nebr.), NimbleGen Systems (Madison, Wis.), Illumina (San Diego, Calif.), and VisiGen Biotechnologies (Houston, Tex.).
  • nucleic acid sequencing technologies comprise formats such as parallel bead arrays, sequencing by ligation, capillary electrophoresis, electronic microchips, “biochips,” microarrays, parallel microchips, and single-molecule arrays, as reviewed by R.F. Service Science 2006 311:1544-1546.
  • the markers to be used in the methods of the present invention should preferably be diagnostic of origin in order for inferences to be made about subsequent populations.
  • SNP markers may be ideal for mapping because the likelihood that a particular SNP allele is derived from independent origins in the extant populations of a particular species is very low. As such, SNP markers appear to be useful for tracking and assisting intro gression of QTLs.
  • PI296341 is a C. lanatus var. citroides accession originating from Africa available through the Germplasm Resources Information Network. PI296341 was backcrossed for several generations to all sweet type elite inbred lines ( C. lanatus var. lanatus ) to derive the ultra-firm flesh watermelon line 03LB3387-1.
  • a segregating population was developed from the cross of 03LB3387-1 and WAS-35-2438 by single seed descent for the mapping of the ultra-firm flesh trait.
  • the population 03LB3387-1 x WAS-35-2438 consisted of 186 F4:5 lines and was planted in three environments: Woodland, Calif. and Tifton, Ga. Test Year 1, and Woodland, Calif. in Test Year 3. The two experiments in Woodland, Calif., were planted in randomized complete block designs, while the Test Year 1 trial in Tifton was a complete randomized design.
  • the parental lines 03LB3387-1 and WAS-35-2438 and their F1 hybrid were used as controls in each of the three trials.
  • Firmness, total soluble solids (Brix), and lycopene data was collected in the Woodland and Tifton Test Year 1 trials.
  • Firmness and Brix data was collected in Woodland in Test Year 3.
  • Firmness data was collected as three penetrometer readings per fruit. The goal was to position readings longitudinally in the proximal, middle, and distal thirds of each fruit, and transversely mid-way between the rind and the center.
  • Brix values were measured with a hand held refractometer (Atago, model PAL-1) using juice extracted with a citrus juicer from fruit samples ( ⁇ 11.5 cm 3 ) with mature-red color.
  • Lycopene content was quantified by HPLC using a bulk of 4 to 5 core samples ( ⁇ 21 cm 3 each) taken from multiple flesh positions of fruit with mature-red color. Data was obtained in Test Year 1 using a penetrometer with a maximum reading of 12 lb/F; therefore, it is possible that for the Test Year 1 trials, a reported value of 12 may actually represent a value greater than 12 lb/F. During the Test Year 3 trial, data was obtained with an instrument that had a range of readings from 1 to 30 lb/F. Therefore, data for each of the three trials was analyzed separately instead of deriving phenotypic means and conducting QTL mapping analysis across the three environments.
  • One-hundred and eighty six 03LB3387-1 x WAS-35-2438 lines were genotyped at the F4 generation using 1,536 SNP markers.
  • a linkage map of the segregating population was constructed using 404 polymorphic markers with JoinMap software. The genetic map consisted of 19 linkage groups ranging in length from 4.5 to 142.1 cM, and had an average length of 64.1 cM. The average distance between adjacent SNP markers across the 19 linkage groups was 3.9 cM.
  • QTL mapping analysis using composite interval mapping in QTL Cartographer identified a major locus controlling firmness on the proximal end of linkage group 9 ([ FIG. 2 ).
  • QTL for Brix and lycopene content were also mapped in the same genomic interval and had moderate to low QTL effects (Table 5).
  • the QTL for flesh firmness was localized to the genomic region flanked by NW0251464 (SEQ ID NO: 1) and NW0250266 (SEQ ID NO: 18), and the peak of the QTL was in close proximity to NW0251011 (SEQ ID NO: 12), NW0249132 (SEQ ID NO: 7), NW0248163 (SEQ ID NO: 9), and NW0250266 (SEQ ID NO: 18).
  • Linkage group 9 from the genetic map of the 03LB3378-1 x WAS-35-2438 population was later aligned to linkage group 2 of a consensus watermelon SNP map constructed with three additional segregating populations (Table 3).
  • Additional markers were identified within the QTL interval including: NW0248953 (SEQ ID NO:2); NW0250301 (SEQ ID NO: 3), NW0248949 (SEQ ID NO: 4), NW0248646 (SEQ ID NO: 5), NW0249077 (SEQ ID NO: 6), NW0252494 (SEQ ID NO: 8), NW0252274 (SEQ ID NO: 10]), NW0248905 (SEQ ID NO: 11), NW0248869 (SEQ ID NO: 13), NW0251470 (SEQ ID NO: 14), NW0251308 (SEQ ID NO: 15), NW0250718 (SEQ ID NO: 16), and NW0248059 (SEQ ID NO: 17).
  • the markers NW0252274 (SEQ ID NO: 10), NW0248646 (SEQ ID NO: 5), and NW0250301 (SEQ ID NO: 3) were found to predict the firm flesh phenotype accurately in diverse watermelon germplasm.

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TR201907519T4 (tr) 2019-06-21
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