CN113498738A - Method for creating new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer - Google Patents
Method for creating new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer Download PDFInfo
- Publication number
- CN113498738A CN113498738A CN202110806056.6A CN202110806056A CN113498738A CN 113498738 A CN113498738 A CN 113498738A CN 202110806056 A CN202110806056 A CN 202110806056A CN 113498738 A CN113498738 A CN 113498738A
- Authority
- CN
- China
- Prior art keywords
- tobacco
- plant
- grafting
- culture
- scion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000012546 transfer Methods 0.000 title claims abstract description 26
- 241000208125 Nicotiana Species 0.000 title claims abstract description 23
- 241000196324 Embryophyta Species 0.000 claims abstract description 137
- 244000061176 Nicotiana tabacum Species 0.000 claims abstract description 105
- 206010020649 Hyperkeratosis Diseases 0.000 claims abstract description 47
- 244000020518 Carthamus tinctorius Species 0.000 claims abstract description 30
- 235000003255 Carthamus tinctorius Nutrition 0.000 claims abstract description 30
- 230000006698 induction Effects 0.000 claims abstract description 19
- 238000000338 in vitro Methods 0.000 claims abstract description 16
- 230000008929 regeneration Effects 0.000 claims abstract description 15
- 238000011069 regeneration method Methods 0.000 claims abstract description 15
- 208000020584 Polyploidy Diseases 0.000 claims abstract description 9
- 239000001963 growth medium Substances 0.000 claims description 46
- 239000007787 solid Substances 0.000 claims description 37
- 238000005520 cutting process Methods 0.000 claims description 23
- 238000012258 culturing Methods 0.000 claims description 17
- 230000002452 interceptive effect Effects 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000012216 screening Methods 0.000 claims description 15
- 239000012153 distilled water Substances 0.000 claims description 12
- 229920001817 Agar Polymers 0.000 claims description 10
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 10
- 229930006000 Sucrose Natural products 0.000 claims description 10
- 239000008272 agar Substances 0.000 claims description 10
- 238000005286 illumination Methods 0.000 claims description 10
- 239000002609 medium Substances 0.000 claims description 10
- 239000005720 sucrose Substances 0.000 claims description 10
- 230000003203 everyday effect Effects 0.000 claims description 8
- 235000016709 nutrition Nutrition 0.000 claims description 5
- 230000035764 nutrition Effects 0.000 claims description 5
- 230000002792 vascular Effects 0.000 claims description 5
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 4
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 4
- 238000009331 sowing Methods 0.000 claims description 4
- 239000008223 sterile water Substances 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000004659 sterilization and disinfection Methods 0.000 claims description 2
- 238000009395 breeding Methods 0.000 abstract description 17
- 230000001488 breeding effect Effects 0.000 abstract description 15
- 230000001568 sexual effect Effects 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 abstract description 8
- 210000001519 tissue Anatomy 0.000 description 14
- 238000009396 hybridization Methods 0.000 description 11
- 108090000623 proteins and genes Proteins 0.000 description 10
- 230000002068 genetic effect Effects 0.000 description 8
- 241000894007 species Species 0.000 description 7
- 241000208128 Nicotiana glauca Species 0.000 description 5
- 238000000684 flow cytometry Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000004083 survival effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 3
- 230000000877 morphologic effect Effects 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 210000003462 vein Anatomy 0.000 description 3
- 208000035199 Tetraploidy Diseases 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 230000001086 cytosolic effect Effects 0.000 description 2
- 230000035558 fertility Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000007198 pollen germination Effects 0.000 description 2
- 230000001850 reproductive effect Effects 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000032823 cell division Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000000349 chromosome Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 244000038559 crop plants Species 0.000 description 1
- 238000009402 cross-breeding Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000035784 germination Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 210000002706 plastid Anatomy 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000005582 sexual transmission Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000009261 transgenic effect Effects 0.000 description 1
Images
Classifications
-
- 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
- A01H4/00—Plant reproduction by tissue culture techniques ; Tissue culture techniques therefor
- A01H4/008—Methods for regeneration to complete plants
-
- 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
- A01H4/00—Plant reproduction by tissue culture techniques ; Tissue culture techniques therefor
- A01H4/002—Culture media for tissue culture
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Developmental Biology & Embryology (AREA)
- Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Cell Biology (AREA)
- Botany (AREA)
- Environmental Sciences (AREA)
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
Abstract
The invention discloses a method for creating a new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer, belonging to the technical field of polyploid breeding of tobacco. The invention adopts safflower cultivated tobacco and yellow flower tobacco as grafting parent materials, and realizes the horizontal transfer of tobacco genome by using the test tube in vitro grafting technology; the artificial tissue culture technology is utilized to realize the induction of grafting and jointing calluses and the regeneration of asexual strains of two grafting parents, overcome the sexual breeding obstacle between two kindred tobacco seeds and form fertile tobacco allopolyploid plants.
Description
Technical Field
The invention relates to the technical field of polyploid breeding of tobacco, in particular to a method for creating a novel interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer.
Background
The allopolyploid is a combination of genomes from two different species and is a main source of species evolution, and the excellent characters of a plurality of modern crop plants are obtained by an allopolyploid pathway, such as the formation of common tobacco, namely the allopetraploid formed by natural doubling of chromosomes after the hybridization of forest tobacco and villous tobacco. More and more studies have found that the close contact between cells of different species induces a horizontal transfer of genetic material, i.e. the process by which a recipient organism obtains genetic material from a donor organism in a asexual manner, in contrast to the sexual transmission during generational multiplication. Horizontal gene transfer is also called horizontal gene transfer, and the new gene plays an important role in the origin, evolution and environmental adaptability of species, and the horizontal gene transfer is an important way for introducing the new gene into the species, can span the interspecies and can carry out genetic information transfer between organisms with distant or close relativity. Can lead the receptor organism to bypass point mutation and recombination to quickly form a new species, accelerate the innovation and evolution of genome and improve the genetic diversity of organisms. The rootstock and the scion are accompanied with the transfer of genetic materials among cells in the process of the reconstruction of callus, cell walls and vascular tissues. Grafting between plants can result in the communication of DNA fragments or the entire plastid genome. Adventitious buds generated by inducing callus through in vitro culture of the grafting junction part are called as grafting chimeras; the chimera induction technology can overcome sexual breeding obstacle of distant or nearby plants and form fertile allopolyploid. The allopolyploid can occur by a asexual mechanism, and grafting can be used as a rapid method for creating a new allopolyploid.
At present, because a single cultivated variety is selected as a parent for cross breeding of a new variety among varieties in tobacco breeding for a long time, the genetic relationship among the germplasms of domestic cultivated tobacco is relatively close, the genetic basis is narrow, the genetic diversity is low, and the method is a prominent problem faced by the tobacco breeding at present. The tobacco distant hybridization is an effective way for directly transferring dominant disease and insect resistant genes in wild tobacco to common cultivated tobacco. Therefore, the genetic basis of tobacco cultivars is widened and enriched, the genetic potential of the wild species of the tobacco is explored, and the creation of backbone parent materials carrying excellent genes is a problem to be solved urgently in tobacco breeding. However, reproductive isolation is common between tobacco species, such as Nicotiana tabacum and Nicotiana flavicana, and severe reproductive isolation exists between Nicotiana tabacum and most of wild tobacco. Therefore, how to effectively overcome the incompatibility of sexual hybridization between common safflower tobacco and yellow flower tobacco or wild tobacco is a technical problem which needs to be solved urgently in the present tobacco distant hybridization breeding.
Disclosure of Invention
The invention aims to provide a method for creating a new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer, wherein safflower cultivated tobacco and yellow flower tobacco are used as grafting parent materials, and the horizontal transfer of a tobacco genome is realized by utilizing a test tube in vitro grafting technology; the induction of grafting and jointing calluses and the regeneration of asexual strains of two grafting parents are realized by utilizing an artificial tissue culture technology; overcomes sexual breeding obstacle between two closely related tobacco species, and forms fertile allopolyploid.
In order to solve the problems, the invention adopts the following technical scheme:
a method for creating a novel germplasm of an interspecies heteropolyploid of tobacco using horizontal genome transfer, the method comprising the steps of:
(1) and (3) sterile seedling cultivation: pretreating safflower tobacco seeds and yellow flower tobacco seeds in a tissue culture room, respectively sowing the seeds in culture dishes containing a solid culture medium, transplanting seedlings growing to a small cross stage into a culture bottle containing the solid culture medium after culturing for two weeks, putting the culture bottle into the tissue culture room, performing illumination culture for 16 hours every day, performing dark culture for 8 hours every day, and taking the seedlings as grafting parents after the seedlings of the safflower tobacco plants and the yellow flower tobacco plants grow to the plant height of 5-10 cm;
(2) in vitro grafting: performing interactive grafting on the grafting parent obtained in the step (1) to obtain a grafted body, placing the obtained grafted body in an MS culture medium for culturing for 2-4 weeks until the grafting combination part is completely fused, and obtaining a scion plant with vascular tissues at the combination part, wherein the scion plant can normally grow;
(3) graft binding site callus induction: cutting off the grafting combination part on the scion plant obtained in the step (2), transversely cutting the grafting tight combination part into a plurality of slices by using a blade, respectively and horizontally placing each slice in a culture bottle containing a callus solid culture medium for culturing for 25d, and performing callus induction to obtain a plurality of callus blocks;
(4) adventitious bud induction and rooting culture: respectively transferring the plurality of callus blocks obtained in the step (3) to a culture bottle containing an MS culture medium to induce the callus blocks to generate adventitious buds, and respectively transplanting the formed adventitious buds to the culture bottle containing a solid culture medium for culture to obtain a regeneration plant; repeating the steps until no adventitious bud is generated;
(5) transplanting the regenerated plants: washing the root culture medium of the regenerated plant obtained in the step (4) with distilled water, transplanting the washed root culture medium into a nutrition pot filled with a sterilized substrate, hardening the seedling for 25-30 days, transplanting the hardened seedling into a flowerpot of a greenhouse, and performing management cultivation according to conventional tobacco to obtain a regenerated plant;
(6) phenotype screening of regenerated plants: performing phenotype screening on the regenerated plant obtained in the step (5) to screen out a plant with interspecific allopolyploid characteristics;
(7) ploidy identification: and (4) identifying the ploidy of the plant with the interspecific allopolyploid characteristic obtained in the step (6), and screening polyploids to obtain a plurality of tobacco interspecific allopolyploid new germplasm plants.
Because the method is adopted, the safflower cultivated tobacco and the yellow flower tobacco are used as grafting parent materials, and the safflower cultivated tobacco and the yellow flower tobacco are incompatible in sexual hybridization and cannot obtain filial generations, the invention realizes the horizontal transfer of tobacco genomes by utilizing a test tube in vitro grafting technology; the artificial tissue culture technology is utilized to realize the induction of grafting and jointing calluses and the regeneration of asexual strains of two grafting parents, overcome the sexual breeding obstacle between two kindred tobacco seeds and form a plurality of fertile tobacco allopolyploid plants. The fertile tobacco allopolyploid plants formed by the invention are tall and big, the stems are thick and strong, the leaves are large and deep in color, and the fruits and seeds are large.
Preferably, the pretreatment in the step (1) is to wash 3 times with sterile water after carrying out disinfection pretreatment with a sodium hypochlorite solution; the illumination intensity of the illumination culture is 50 mu Em-2 S-1The temperature of light culture is 24 ℃, and the temperature of dark culture is 22 ℃;
by adopting the method, the tobacco seeds are pretreated and then cleaned, so that the germination rate of the seeds is effectively improved; the healthy and strong tobacco seedlings can be conveniently obtained by culturing under specific illumination intensity and temperature, and the plant height of the tobacco seedlings can be influenced by the intensity of the illumination intensity and the temperature.
Preferably, the composition of the solid medium in the step (1) and the step (4) is as follows: 4.74g/L MS, 30g/L sucrose, 6g/L agar and distilled water, and the pH of the solid medium is 5.8.
By adopting the method, the elongation and growth of the tobacco seedling stem and the regenerated plant can be better promoted by selecting the culture medium, and the composition and components of the solid culture medium can more or less influence the growth of the seedling and the plant.
Preferably, the callus solid medium in the step (3) has the following composition: 4.74g/L MS, 5mg/L KT, 0.2mg/L NAA, 30g/L sucrose, 6g/L agar, and the pH of the callus solid medium is 5.8.
By adopting the method, the specific callus solid culture medium is selected, so that mineral nutrition required by tobacco tissue production can be ensured, cell division is induced, formation of roots is facilitated, differentiation of stems and leaves is inhibited, and rapid growth of induced callus can be accelerated; the composition and components of the solid callus culture medium are more or less, which influences whether the callus can be well induced.
Preferably, the interactive grafting method in the step (2) is as follows: selecting a seedling plant of the safflower tobacco as a scion plant, reserving 2 small leaves at the top of the scion plant, removing the rest leaves, symmetrically beveling the scion plant by 45 degrees along two sides of a stem to form a wedge-shaped interface; selecting a yellow tobacco seedling plant as a stock plant, reserving a stem section which is 3cm above the root system of the stock plant, cutting off the rest, and splitting an interface matched with a wedge-shaped interface of a scion plant from the middle part of the reserved stem by using a double-sided blade; inserting the wedge-shaped end of the scion plant into the stock plant interface, and fixing the interface by using a plastic sleeve to complete the interactive grafting.
Preferably, the interactive grafting method in the step (2) is as follows: selecting a yellow tobacco seedling plant as a scion plant, reserving 2 small leaves on the top of the scion plant, removing the rest leaves, symmetrically beveling the scion plant by 45 degrees along two sides of a stem to form a wedge-shaped interface; selecting a safflower tobacco seedling plant as a stock plant, reserving a stem section which is 3cm above the root system of the stock plant, cutting off the rest, and splitting an interface matched with a wedge-shaped interface of a scion plant from the middle part of the reserved stem by using a double-sided blade; inserting the wedge-shaped end of the scion plant into the stock plant interface, and fixing the interface by using a plastic sleeve to complete the interactive grafting.
By adopting the method, the two grafting parents of the safflower tobacco and the yellow flower tobacco can be mutually used as scions or stocks for interactive grafting, the grafting and the callus induction and the asexual line regeneration are carried out, the sexual breeding obstacle between two kindred tobacco seeds is overcome, and a multi-plant fertile tobacco allopolyploid plant is formed.
Preferably, the thickness of the slice cut from the grafting tight combination part is 1-2 mm.
Compared with the prior art, the invention has the advantages that:
(1) the invention realizes the horizontal transfer of the genome of the cultivated tobacco and the wild tobacco by using the test tube in vitro grafting technology for the first time, proves that the test tube in vitro grafting technology is an effective method for overcoming distant hybridization incompatibility, and the method can be applied to germplasm creation and variety breeding of other horticultural crops which are easy to graft and organize for culture.
(2) The invention adopts safflower cultivated tobacco and yellow flower tobacco as grafting parent materials, and realizes the horizontal transfer of tobacco genome by using the test tube in vitro grafting technology; the artificial tissue culture technology is utilized to realize the induction of grafting and jointing calluses and the regeneration of asexual strains of two grafting parents, overcome the sexual hybridization obstacle between two kindred tobacco seeds and obtain a plurality of fertile tobacco allopolyploid plants.
(3) The method has strong practicability and simple and easy operation, saves the time for obtaining the allopolyploid, can be widely applied to tobacco distant hybridization breeding with sexual hybridization incompatibility among tobacco seeds, and the allopolyploid material obtained by the method does not contain any transgenic component and can be directly applied to variety breeding.
(4) The invention effectively solves the problems of insufficient exploitation and utilization of wild tobacco resources and narrow genetic basis of common tobacco at present, creates a tobacco germplasm resource bank and has a guiding function on innovation of a tobacco breeding method.
Drawings
FIG. 1 is a diagram of an in vitro grafted plant of the present invention;
FIG. 2 is a diagram of callus induced from the grafting binding site according to the present invention;
FIG. 3 is a diagram of the morphological characteristics of the plants of the grafted parent nicotiana tabacum Yunyan 87, nicotiana tabacum G391 and the allopolyploid GY7 of the present invention;
FIG. 4 is a graph of the relative DNA content analysis of the grafted parent and the allopolyploid plant of the present invention;
Detailed Description
The following examples are further illustrative of the present invention and are not intended to be limiting thereof.
Example 1:
a method for creating a novel germplasm of an interspecies heteropolyploid of tobacco using horizontal genome transfer, the method comprising the steps of:
because the carthamus tinctorius (Yunyan 87) and the yellow flower tobacco (G391) are incompatible in sexual hybridization and filial generation cannot be obtained, the carthamus tinctorius (Yunyan 87) and the yellow flower tobacco (G391) which are commonly cultivated are selected as two grafting parents, the carthamus tinctorius (Yunyan 87) seedling plant is taken as a scion plant, and the yellow flower tobacco (G391) seedling plant is taken as a stock plant.
(1) Cultivation of aseptic seedlings
Sterilizing the surfaces of safflower tobacco seeds (Yunyan 87) and yellow flower tobacco seeds (G391) by using a sodium hypochlorite solution in a tissue culture room, then repeatedly cleaning the surfaces by using sterile water for 3 times, respectively sowing the seeds into culture dishes containing solid culture media, transplanting seedlings growing to a small cross stage into a culture bottle containing the solid culture media after culturing for two weeks, putting the culture bottle into the tissue culture room, culturing for 16 hours every day by illumination, culturing for 8 hours every day in the dark, and taking the safflower tobacco plants and the yellow flower tobacco seedlings as grafting parents to perform subsequent tests after the safflower tobacco plants and the yellow flower tobacco seedlings grow to the plant height of 10 cm; the solid culture medium comprises the following components: 4.74g/L MS, 30g/L sucrose, 6g/L agar and distilled water, and the pH value of the solid culture medium is 5.8; the light intensity of the above light culture is 50 μ Em-2S-1The temperature for light culture was 24 ℃ and the temperature for dark culture was 22 ℃.
2) In vitro grafting:
and (2) carrying out interactive grafting on the grafting parent obtained in the step (1) to obtain a grafted body, and placing the obtained grafted body in an MS culture medium for culturing for 2-4 weeks until the grafting combination part is completely fused, so as to obtain a scion plant capable of normally growing. Selecting tobacco aseptic seedlings with similar stem circumferences as grafting parents, taking safflower tobacco seedling plants as scion plants, reserving 2 small leaves on the tops of the scion plants, removing the rest leaves, and symmetrically beveling the scion plants by 45 degrees along two sides of a stem to form a wedge-shaped interface, wherein the stem lengths are about 3 cm; selecting yellow tobacco seedling plants as stock plants, reserving stem sections which are 3cm above root systems of the stock plants, and cutting off the rest; splitting a 5mm interface from the middle part of the stem by using a double-sided blade; inserting the wedge-shaped end of the scion into a stock interface, beveling the stems of two grafting parents by about 45 degrees after cambiums are matched, connecting the stems to ensure that the cambiums are matched, and fixing the stems by using a plastic sleeve to complete the interactive grafting (as shown in figure 1); culturing the treated graft in an MS culture medium for 2-4 weeks until the grafting combination part is completely fused, and timely shearing axillary buds growing on the rootstock every week during the period; the sign of in vitro grafting survival is that the combination part of the rootstock and the scion forms functional vascular tissues, and the scion plant grows normally. The solid medium used was 4.74g/L MS +30g/L sucrose +6g/L agar, the remainder was distilled water, pH 5.8.
(3) Graft binding site callus induction: cutting off the grafting combination part on the scion plant obtained in the step (2), transversely cutting the grafting tight combination part into a plurality of slices by using a blade, respectively and horizontally placing each slice in a culture bottle containing a callus solid culture medium for culturing for 25d, and performing callus induction to obtain a plurality of callus blocks. Selecting a grafting body with better grafting survival, cutting off a grafting combination part, cutting off parts which are not adhered at two ends, only keeping the parts of two grafting parents which are tightly combined, transversely cutting the combination part into thin slices with the thickness of about 1mm by a blade, generally cutting one grafting part into about 4 slices, then horizontally placing the thin slices of the grafting combination part in a culture bottle containing a solid culture medium for about 25 days, and carrying out callus induction (as shown in figure 2).
(4) Adventitious bud induction and rooting culture: respectively transferring the plurality of callus blocks obtained in the step (3) to a culture bottle containing an MS culture medium to induce the callus blocks to generate adventitious buds, and respectively transplanting the formed adventitious buds to the culture bottle containing a solid culture medium for culture to obtain a regeneration plant; in the process, the callus can continuously generate adventitious buds, and the callus needs to be continuously transplanted until no adventitious buds are generated; the solid medium used was 4.74g/L MS +30g/L sucrose +6g/L agar, the remainder was distilled water, pH 5.8.
(5) Transplanting the regenerated plants: washing the root culture medium of the regenerated plant obtained in the step (4) with distilled water, transplanting the washed root culture medium into a nutrition pot filled with a sterilized substrate, hardening the seedling for 25-30 days, transplanting the hardened seedling into a flowerpot of a greenhouse, and performing management cultivation according to conventional tobacco to obtain a regenerated plant;
(6) phenotype screening of regenerated plants: performing phenotype screening on the regenerated plant obtained in the step (5) to screen out a plant with interspecific allopolyploid characteristics;
the external shape of the plant with the allopolyploid characteristic shows that the plant is tall and big, the stem is thick and strong, the leaves are large, the color of the leaves is dark, and the fruit and the seeds are large. According to the difference between the phenotype characters of the asexual regeneration plant and the two grafting parents, preliminarily screening out the plant line which is possible to be interspecific allopolyploid after investigating the phenotype characters. Morphological structures of pistils and stamens and pollen germination determination are observed, and fertility of the allopolyploid material is observed through selfing and backcrossing.
Compared with the grafted parent Yunyan 87 and G391, the leaf shape and the leaf tip of the allopolyploid GY7 plant are similar to the Yunyan 87, and the main botanical trait differences are that the leaf color is light green, the main vein is thick, the branch vein is thick and malformed, the branch vein at the leaf ear is densely distributed, and the leaf is thick (as shown in figure 3 and table 1)
Table 1: comparison of the botanical traits of the grafted parent Yunyan 87, G391 and the allopolyploid asexual Strain GY7
(7) Ploidy identification: and (4) identifying the ploidy of the plant with the interspecific allopolyploid characteristic obtained in the step (6), and screening polyploids to obtain a plurality of tobacco interspecific allopolyploid new germplasm plants.
The DNA content and ploidy level of the asexual regeneration plant are determined by adopting a flow cytometry, the tetraploid Yunyan 87 is taken as an external standard, and the relative fluorescence intensity values of G391, a cytoplasmic male sterile line (MS Yunyan 87) and G1 of various heterologous polyploid regeneration lines are determined by flow cytometry, according to the formula: sample ploidy × (sample G1 peak fluorescence intensity/external standard G1 peak fluorescence intensity value) for the external standard sample, the theoretical ploidy level for each unknown sample was calculated. The results show that the asexual strains obtained by the in vitro grafting combination part have allopolyploid such as pentaploid, hexaploid and octaploid (shown in figure 4 and table 2), and 8 new allopolyploid germplasm such as GY4, GY5, GY7, GY11, GY13, GY14, GY19 and GY38 are obtained in total.
Table 2: ploidy level of grafted parent and asexual strain
Example 2:
a method for creating a novel germplasm of an interspecies heteropolyploid of tobacco using horizontal genome transfer, the method comprising the steps of:
because the carthamus tinctorius (Yunyan 87) and the yellow flower tobacco (G391) are incompatible in sexual hybridization and cannot obtain filial generations, the carthamus tinctorius (Yunyan 87) and the yellow flower tobacco (G391) which are commonly cultivated are selected as two grafting parents, the yellow flower tobacco (G391) seedling plant is taken as a scion plant, and the safflower tobacco (Yunyan 87) seedling plant is taken as a stock plant.
(1) Cultivation of aseptic seedlings
Sterilizing the surfaces of safflower tobacco seeds (Yunyan 87) and yellow flower tobacco seeds (G391) by using a sodium hypochlorite solution in a tissue culture room, then repeatedly cleaning the surfaces by using sterile water for 3 times, respectively sowing the seeds into culture dishes containing solid culture media, transplanting seedlings growing to a small cross stage into a culture bottle containing the solid culture media after culturing for two weeks, putting the culture bottle into the tissue culture room, performing illumination culture 16 every day, and performing dark culture 8 every day, and taking the safflower tobacco plants and the yellow flower tobacco seedlings as grafting parents to perform subsequent tests after the safflower tobacco plants and the yellow flower tobacco seedlings grow to the plant height of 8 cm; the solid culture medium comprises the following components: 4.74g/L MS, 30g/L sucrose, 6g/L agar and distilled water, and the pH value of the solid culture medium is 5.8; the light intensity of the above light culture is 50 μ Em-2 S-1The temperature for light culture was 24 ℃ and the temperature for dark culture was 22 ℃.
2) In vitro grafting:
and (2) carrying out interactive grafting on the grafting parent obtained in the step (1) to obtain a grafted body, and placing the obtained grafted body in an MS culture medium for culturing for 2-4 weeks until the grafting combination part is completely fused, so as to obtain a scion plant capable of normally growing. Selecting tobacco aseptic seedlings with similar stem circumferences as grafting parents, taking yellow tobacco (G391) seedling plants as scion plants, reserving 2 small leaves on the tops of the scion plants, removing the rest leaves, and symmetrically beveling the scion plants by 45 degrees along two sides of a stem to form a wedge-shaped interface, wherein the stem lengths are about 3 cm; selecting seedling plants of the tobacco (Yunyan 87) with safflower, reserving stem sections which are 3cm above root systems of the stock plants, and cutting off the rest; splitting a 5mm interface from the middle part of the stem by using a double-sided blade; inserting the wedge-shaped end of the scion into a stock interface, beveling the stems of two grafting parents by about 45 degrees after cambiums are matched, connecting the stems to ensure that the cambiums are matched, and fixing the stems by using a plastic sleeve to complete the interactive grafting (as shown in figure 1); culturing the treated graft in an MS culture medium for 4 times until the grafting combination part is completely fused, and timely cutting off axillary buds growing on the rootstock every week during the period; the sign of in vitro grafting survival is that the combination part of the rootstock and the scion forms functional vascular tissues, and the scion plant grows normally. The solid medium used was 4.74g/L MS +30g/L sucrose +6g/L agar, the remainder was distilled water, pH 5.8.
(3) Grafting binding site callus: cutting off the grafting combination part on the scion plant obtained in the step (2), transversely cutting the grafting tight combination part into a plurality of slices by using a blade, respectively and horizontally placing each slice in a culture bottle containing a callus solid culture medium for culturing for 25d, and performing callus induction to obtain a plurality of callus blocks. Selecting a grafting body with better grafting survival, cutting off a grafting combination part, cutting off parts which are not adhered at two ends, only keeping the parts of two grafting parents which are tightly combined, transversely cutting the combination part into thin slices with the thickness of about 1mm by a blade, generally cutting one grafting part into about 4 slices, then horizontally placing the thin slices of the grafting combination part in a culture bottle containing a solid culture medium for about 25 days, and carrying out callus induction (as shown in figure 2).
(4) Adventitious bud induction and rooting culture: respectively transferring the plurality of callus blocks obtained in the step (3) to a culture bottle containing an MS culture medium to induce the callus blocks to generate adventitious buds, and respectively transplanting the formed adventitious buds to the culture bottle containing a solid culture medium for culture to obtain a regeneration plant; in the process, the callus can continuously generate adventitious buds, and the callus needs to be continuously transplanted until no adventitious buds are generated; the solid medium used was 4.74g/L MS +30g/L sucrose +6g/L agar, the remainder was distilled water, pH 5.8.
(5) Transplanting the regenerated plants: and (4) washing the root culture medium of the regenerated plant obtained in the step (4) with distilled water, transplanting the washed root culture medium into a nutrition pot filled with a sterilized substrate, hardening the seedling for 25-30 days, transplanting the hardened seedling into a flowerpot of a greenhouse, and managing and cultivating the hardened seedling according to conventional tobacco.
(6) Phenotype screening of regenerated plants: performing phenotype screening on the regenerated plant obtained in the step (5) to screen out a plant with interspecific allopolyploid characteristics; the external morphology of polyploids generally shows that plants are tall and big, stems are thick and strong, leaves are large, the color of the leaves is dark, and fruits and seeds are large. According to the difference between the phenotype characters of the asexual regeneration plant and the two grafting parents, preliminarily screening out the plant line which is possible to be interspecific allopolyploid after investigating the phenotype characters. Morphological structures of pistils and stamens and pollen germination determination are observed, and fertility of the allopolyploid material is observed through selfing and backcrossing.
(7) Ploidy identification: and (4) identifying the ploidy of the plant with the interspecific allopolyploid characteristic obtained in the step (6), and screening polyploids to obtain a plurality of tobacco interspecific allopolyploid new germplasm plants. The DNA content and ploidy level of the asexual regeneration plant are determined by adopting a flow cytometry, the tetraploid Yunyan 87 is taken as an external standard, and the relative fluorescence intensity values of G391, a cytoplasmic male sterile line (MS Yunyan 87) and G1 of various heterologous polyploid regeneration lines are determined by flow cytometry, according to the formula: sample ploidy × (sample G1 peak fluorescence intensity/external standard G1 peak fluorescence intensity value) for the external standard sample, the theoretical ploidy level for each unknown sample was calculated. The results show that the asexual strains obtained by the in vitro grafting and combining parts have allopolyploids such as pentaploid, hexaploid and octaploid, and 8 allopolyploid new germplasms are obtained in total.
The inventor finds that the two grafting parents of the safflower tobacco and the yellow flower tobacco can be mutually used as scions or stocks for interactive grafting, the grafting and grafting callus is induced and asexual strains are regenerated, and 8 new allopolyploid germplasm can be obtained through phenotype screening and ploidy identification of regenerated plants. Overcomes sexual breeding obstacle between two closely related tobacco species, forms fertile tobacco allopolyploid plants, and has guiding effect on innovation of tobacco breeding method. The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.
Claims (7)
1. A method for creating a novel germplasm of an interspecies heteropolyploid of tobacco by using horizontal genome transfer, which is characterized by comprising the following steps: the method comprises the following steps:
(1) and (3) sterile seedling cultivation: pretreating safflower tobacco seeds and yellow flower tobacco seeds in a tissue culture room, respectively sowing the seeds in culture dishes containing a solid culture medium, transplanting seedlings growing to a small cross stage into a culture bottle containing the solid culture medium after culturing for two weeks, putting the culture bottle into the tissue culture room, performing illumination culture for 16 hours every day, performing dark culture for 8 hours every day, and taking the seedlings as grafting parents after the seedlings of the safflower tobacco plants and the yellow flower tobacco plants grow to the plant height of 5-10 cm;
(2) in vitro grafting: performing interactive grafting on the grafting parent obtained in the step (1) to obtain a grafted body, placing the obtained grafted body in an MS culture medium for culturing for 2-4 weeks until the grafting combination part is completely fused, and obtaining a scion plant with vascular tissues at the combination part, wherein the scion plant can normally grow;
(3) graft binding site callus induction: cutting off the grafting combination part on the scion plant obtained in the step (2), transversely cutting the grafting tight combination part into a plurality of slices by using a blade, respectively and horizontally placing each slice in a culture bottle containing a callus solid culture medium for culturing for 25d, and performing callus induction to obtain a plurality of callus blocks;
(4) adventitious bud induction and rooting culture: respectively transferring the plurality of callus blocks obtained in the step (3) to a culture bottle containing an MS culture medium to induce the callus blocks to generate adventitious buds, and respectively transplanting the formed adventitious buds to the culture bottle containing a solid culture medium for culture to obtain a regeneration plant; repeating the steps until no adventitious bud is generated;
(5) transplanting the regenerated plants: washing the root culture medium of the regenerated plant obtained in the step (4) with distilled water, transplanting the washed root culture medium into a nutrition pot filled with a sterilized substrate, hardening the seedling for 25-30 days, transplanting the hardened seedling into a flowerpot of a greenhouse, and performing management cultivation according to conventional tobacco to obtain a regenerated plant;
(6) phenotype screening of regenerated plants: performing phenotype screening on the regenerated plant obtained in the step (5) to screen out a plant with interspecific allopolyploid characteristics;
(7) ploidy identification: and (4) identifying the ploidy of the plant with the interspecific allopolyploid characteristic obtained in the step (6), and screening polyploids to obtain a plurality of tobacco interspecific allopolyploid new germplasm plants.
2. The method of creating new germplasm of tobacco allopolyploids by horizontal genome transfer according to claim 1, wherein the new germplasm comprises: the pretreatment in the step (1) is to use a sodium hypochlorite solution for disinfection pretreatment and then use sterile water for cleaning for 3 times; the illumination intensity of the illumination culture is 50 mu Em-2S-1The temperature for light culture is 24 ℃, and the temperature for dark culture is 22 ℃.
3. The method of creating new germplasm of tobacco allopolyploids by horizontal genome transfer according to claim 1, wherein the new germplasm comprises: the solid culture medium in the step (1) and the step (4) comprises the following components: 4.74g/L MS, 30g/L sucrose, 6g/L agar and distilled water, and the pH of the solid medium is 5.8.
4. The method of creating new germplasm of tobacco allopolyploids by horizontal genome transfer according to claim 1, wherein the new germplasm comprises: the callus solid culture medium in the step (3) comprises the following components: 4.74g/L MS, 5mg/L KT, 0.2mg/L NAA, 30g/L sucrose, 6g/L agar, and the pH of the callus solid medium is 5.8.
5. The method of creating new germplasm of tobacco allopolyploids by horizontal genome transfer according to claim 1, wherein the new germplasm comprises: the interactive grafting method in the step (2) comprises the following steps: selecting a seedling plant of the safflower tobacco as a scion plant, reserving 2 small leaves at the top of the scion plant, removing the rest leaves, symmetrically beveling the scion plant by 45 degrees along two sides of a stem to form a wedge-shaped interface; selecting a yellow tobacco seedling plant as a stock plant, reserving a stem section which is 3cm above the root system of the stock plant, cutting off the rest, and splitting an interface matched with a wedge-shaped interface of a scion plant from the middle part of the reserved stem by using a double-sided blade; inserting the wedge-shaped end of the scion plant into the stock plant interface, and fixing the interface by using a plastic sleeve to complete the interactive grafting.
6. The method of creating new germplasm of tobacco allopolyploids by horizontal genome transfer according to claim 1, wherein the new germplasm comprises: the interactive grafting method in the step (2) comprises the following steps: selecting a yellow tobacco seedling plant as a scion plant, reserving 2 small leaves on the top of the scion plant, removing the rest leaves, symmetrically beveling the scion plant by about 45 degrees along two sides of a stem to form a wedge-shaped interface; selecting a safflower tobacco seedling plant as a stock plant, reserving a stem section which is 3cm above the root system of the stock plant, cutting off the rest, and splitting an interface matched with a wedge-shaped interface of a scion plant from the middle part of the reserved stem by using a double-sided blade; inserting the wedge-shaped end of the scion plant into the stock plant interface, and fixing the interface by using a plastic sleeve to complete the interactive grafting.
7. The method of creating new germplasm of tobacco allopolyploids by horizontal genome transfer according to claim 1, wherein the new germplasm comprises: the thickness of the slice cut from the grafting tight combination part is 1-2 mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110806056.6A CN113498738A (en) | 2021-07-16 | 2021-07-16 | Method for creating new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202110806056.6A CN113498738A (en) | 2021-07-16 | 2021-07-16 | Method for creating new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer |
Publications (1)
Publication Number | Publication Date |
---|---|
CN113498738A true CN113498738A (en) | 2021-10-15 |
Family
ID=78013617
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202110806056.6A Pending CN113498738A (en) | 2021-07-16 | 2021-07-16 | Method for creating new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN113498738A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114097615A (en) * | 2021-11-23 | 2022-03-01 | 云南省烟草农业科学研究院 | Method for overcoming distant hybridization II type lethality and improving valeric acid content germplasm by applying tissue culture technology |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1229140A (en) * | 1999-03-30 | 1999-09-22 | 中国科学院遗传研究所 | Producing method for transfer-gen plant |
CA2904855A1 (en) * | 1999-03-18 | 2000-09-21 | The University Of Chicago | Plant centromeres |
US20080189805A1 (en) * | 2006-12-13 | 2008-08-07 | Serbin John J | Novel genes and rna molecules that confer stress tolerance |
CN101707963A (en) * | 2009-12-30 | 2010-05-19 | 河南省农业科学院 | Cotton breeding method |
CN101933458A (en) * | 2010-07-05 | 2011-01-05 | 江苏徐州甘薯研究中心 | Method for stimulating gene exchange among sweet potato germplasm sources |
CN102217536A (en) * | 2011-04-20 | 2011-10-19 | 西南大学 | Method for rapidly transferring plastid transgenic plants with tissue culture |
CN105766642A (en) * | 2016-03-28 | 2016-07-20 | 南京晓庄学院 | Method for building cell culture system for chimera obtained through grafting vinca rosea to vinca minor |
CN108522290A (en) * | 2017-03-02 | 2018-09-14 | 云南纳博生物科技有限公司 | A kind of self-luminous tobacco and transgenic method |
CN110982820A (en) * | 2020-01-03 | 2020-04-10 | 云南中烟工业有限责任公司 | Gene editing method of tobacco haploid |
-
2021
- 2021-07-16 CN CN202110806056.6A patent/CN113498738A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2904855A1 (en) * | 1999-03-18 | 2000-09-21 | The University Of Chicago | Plant centromeres |
CN1229140A (en) * | 1999-03-30 | 1999-09-22 | 中国科学院遗传研究所 | Producing method for transfer-gen plant |
US20080189805A1 (en) * | 2006-12-13 | 2008-08-07 | Serbin John J | Novel genes and rna molecules that confer stress tolerance |
CN101707963A (en) * | 2009-12-30 | 2010-05-19 | 河南省农业科学院 | Cotton breeding method |
CN101933458A (en) * | 2010-07-05 | 2011-01-05 | 江苏徐州甘薯研究中心 | Method for stimulating gene exchange among sweet potato germplasm sources |
CN102217536A (en) * | 2011-04-20 | 2011-10-19 | 西南大学 | Method for rapidly transferring plastid transgenic plants with tissue culture |
CN105766642A (en) * | 2016-03-28 | 2016-07-20 | 南京晓庄学院 | Method for building cell culture system for chimera obtained through grafting vinca rosea to vinca minor |
CN108522290A (en) * | 2017-03-02 | 2018-09-14 | 云南纳博生物科技有限公司 | A kind of self-luminous tobacco and transgenic method |
CN110982820A (en) * | 2020-01-03 | 2020-04-10 | 云南中烟工业有限责任公司 | Gene editing method of tobacco haploid |
Non-Patent Citations (2)
Title |
---|
IGNACIA FUENTES等: "Horizontal genome transfer as an asexual path to the formation of new species", 《NATURE》 * |
陆玉建等: "本生烟草愈伤组织的诱导和再生体系的建立", 《江苏农业科学》 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114097615A (en) * | 2021-11-23 | 2022-03-01 | 云南省烟草农业科学研究院 | Method for overcoming distant hybridization II type lethality and improving valeric acid content germplasm by applying tissue culture technology |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Kouassi et al. | Development of backcross generations and new interspecific hybrid combinations for introgression breeding in eggplant (Solanum melongena) | |
Mallikarjuna et al. | Production of hybrids between Cajanus platycarpus and Cajanus cajan | |
Thurling et al. | The influence of donor plant genotype and environment on production of multicellular microspores in cultured anthers of Brassica napus ssp. oleifera | |
KR20180130547A (en) | How to select and breed cruciferous vegetables materials and varieties in rapeseed haploid guiding system | |
CN101707963A (en) | Cotton breeding method | |
Rotino | Anther culture in eggplant (Solanum melongena L.) | |
Costa et al. | Advances observed in papaya tree propagation | |
JP4364282B2 (en) | Euphorbia (Euphorbia) interspecific hybrid plant | |
CN113498738A (en) | Method for creating new interspecific allopolyploid germplasm of tobacco by utilizing horizontal genome transfer | |
CN107047311A (en) | A kind of leek Unfertilized Ovaries in-vitro culture method | |
CN108308017B (en) | Cultivation method of virus-resistant interspecific introgression line of sweet potatoes | |
Mallikarjuna et al. | Chickpea hybridization using in vitro techniques | |
CN101828525B (en) | Method for obtaining plant graft chimaera progeny by embryo rescue | |
JPH05276845A (en) | Method for breeding porato and production of seed potato | |
Clements et al. | Interspecific crossing among the New World lupin species for Lupinus mutabilis crop improvement | |
Marks et al. | Physiological variability arising from in vitro culture is induced by shoot selection and manipulation strategies | |
Chitra et al. | A comparative study on field performance of micropropagated plants and stem cutting derived plants of S-36 cultivar of Mulberry (Morus indica L.) | |
Rokka | Anther culture through direct embryogenesis in a genetically diverse range of potato (Solanum) species and their interspecific and intergeneric hybrids | |
AU2002217763A1 (en) | Euphorbia interspecific hybrid plant | |
CN108834604B (en) | Distant hybridization method for potato tetraploid cultivars and diploid wild species | |
CN101485292A (en) | Rapid breeding method for Amur honeysuckle with long green period | |
Wolyn et al. | Asparagus microspore and anther culture | |
US11672216B2 (en) | Methods for promoting production of viable seeds from apomictic guayule plants | |
CN107667861B (en) | Grafting method of peanut tissue culture seedlings | |
Oo et al. | Effect of Different Concentrations and Combinations of BAP and NAA on Micropropagation of Anthurium (Anthurium andraeanum Linn.) Red |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211015 |