CN110759979B - Transcription factor for improving starch synthesis of wheat grainsbZIP2And uses thereof - Google Patents
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Abstract
The invention discloses a transcription factor capable of improving the starch synthesis of wheat grainsbZIP2And uses thereof, the transcription factor isTubZIP2A gene, andTubZIP2gene homology gene in common wheatTabZIP2Three copies of (a):TabZIP‑A2、TabZIP‑ B2andTabZIP‑D2the coding region consists of nucleotide sequences shown by SEQ ID No.1, No.2, No.3 and No.4 respectively. In thatTubZIP2In the case of the over-expressed wheat line of (1),AGPL‑cyto、AGPS‑ cytoandSBEIIathe expression of the protein is obviously improved in the middle and later periods of endosperm filling compared with the wild type, while the expression quantity of other Starch Synthesis Related Genes (SSRG) is not changed, and the grain length and thousand kernel weight are also obviously increased. Knocking out genes in common wheatTabZIP2The total starch and amylopectin content of the knockout line is obviously reduced, and the grain length and thousand grain weight are also obviously reduced.TubZIP2Over-expression lines andTabZIP2the plant height, effective tillering, small spike number and grain length of the knockout line have no obvious change.
Description
Technical Field
The invention relates to the field of genetic engineering, in particular to a transcription factor for improving the expression of wheat starch synthesis related genes and application thereof.
Background
Wheat, one of the major crops in the world, not only provides protein, vitamins and dietary fiber for human health, but also is a major source of starch and energy in the human diet. Starch is the main storage component in the endosperm of wheat grains, accounting for 60-70% of the total weight of grains and 70-85% of the total weight of flour.
Starch synthesis in wheat endosperm cells involves a complex series of reactions requiring the involvement of a series of enzymes. At the start of starch synthesis, AGPase catalyzes the conversion of glucose-1-phosphate (G1 c-1-P) and Adenosine Triphosphate (ATP) to adenosine diphosphateAcid glucose (ADP-glucose), is the glucose donor for amylose and amylopectin synthesis. Thereafter, granule-bound starch synthase (GBSS) catalyzes the ADP-glucose to finally form amylose, while Starch Synthase (SS), Starch Branching Enzyme (SBE) and debranching enzyme (DBE) catalyze the ADP-glucose transfer to highly branched glucan branches to finally form amylopectin. The content of the starch of the grains can be effectively improved by regulating and controlling the expression of the starch synthesis related gene, thereby improving the yield of wheat. However, to date, there have been few reports on transcriptional regulation of starch synthesis in cereal grains. WhereinRSR1AndOsbZIP58is a starch synthesis regulation factor identified in rice;ZmNAC36、ZmbZIP91、ZmEREB156and SUSIBA2are transcription factors that regulate starch synthesis identified in maize and barley, respectively. In wheat, except for riceRSR1Homologous geneTaRSR1There is no report on the systematic study of starch synthesis regulation mechanism.
Disclosure of Invention
The invention identifies a transcription factor Co-expressed with Starch Synthesis Related Genes (SSRG) in endosperm filling period by Weighted Gene Co-expression Network Analysis (WGCNA)TubZIP2。TubZIP2And homologous gene thereof in common wheatTabZIP2Can be remarkably improvedAGPL-cyto、AGPS-cytoAndSBEIIathe expression of the gene further improves the total starch and amylopectin content of the wheat grains. At the same time, the user can select the desired position,TubZIP2andTabZIP2has no any adverse effect on other important agronomic traits of wheat.
The invention is helpful for people to understand the regulation and control of wheat starch synthesis,TubZIP2andTabZIP2can also be used as an important target gene for genetic engineering and traditional breeding to culture a new wheat variety with high yield and high quality.
The inventor identifies and obtains the genome data analysis of endosperm of the grain filling stage of the Wulare diagram wheat G1812TubZIP2Has similar expression pattern with partial SSRG gene. The TubZIP2 subcellular location is in nucleus, and 1-128 aa thereof hasTranscriptional activation activity. In the dual-luciferase reporter gene system analysis and the wheat endosperm transient overexpression analysis,TubZIP2promotion ofAGPL-cyto、AGPS-cytoAndSBEIIaactivity of a gene promoter. In thatTubZIP2In the case of the over-expressed wheat line of (1),AGPL-cyto、AGPS-cytoandSBEIIathe expression of (a) is obviously improved in the middle and later stages of endosperm filling compared with the wild type, and the expression quantity of other SSRG genes is not changed. Correspondingly, the total starch content and the amylopectin content of the overexpression line are obviously improved, and the grain length and the thousand grain weight of the overexpression line are also obviously increased. In contrast, knockouts using CRISPR/Cas9 technologyTubZIP2Homologous genes in common wheatTabZIP2The total starch content and amylopectin content of the knockout line are obviously reduced, and the grain length and thousand grain weight are also obviously reduced.TubZIP2Over-expression lines andTabZIP2the plant height, effective tillering, small spike number and grain length of the knockout line have no obvious change. In any case, it is preferable that,TubZIP2andTabZIP2promotes the synthesis of the starch of the wheat grains, and has no negative influence on other important agronomic traits.
The invention aims to provide a transcription factor for regulating and controlling the expression of an SSRG geneTubZIP2The transcription factor promotes starch synthesis.
The transcription factor provided by the inventionTubZIP2Is derived from wheat with a Wulare diagram and has a coding region consisting of a nucleotide sequence shown as SEQ ID No. 1. The DNA shown in SEQ ID No.1 has a length of 1722 bp (excluding stop codon), belongs to the bZIP family, and encodes a protein of 574 amino acid residues.TubZIP2The homologous gene in common wheat isTabZIP2It has three copiesTabZIP-A2、TabZIP-B2AndTabZIP-D2the coding regions are respectively nucleotide sequences shown in SEQ ID No.2, SEQ ID No.3 and SEQ ID No.4, the length of the coding regions is 1722 bp, and 574 protein with amino acid residues is coded.
Meanwhile, the present invention provides a recombinant vector comprising the transcription factor of claim 1.
The invention also provides an expression vector containing the transcription factor, preferably a plant expression vector.
The invention provides an application of the transcription factor in improving the expression of SSRG genes in the filling stage in wheat; the application is to transform the transcription factor into wheat and screen a positive transgenic line over expressing the transcription factor.
The invention also provides a method for over-expressing the transcription factor in endosperm, which is to transform the endosperm of common wheat by using an over-expression vector containing the transcription factor, preferably to transform the endosperm 15 days after the common wheat blossoms by using a gene gun method.
Also, the present invention provides amplificationTubZIP2AndTabZIP2the universal primer pair of the full length of the coding region, wherein the sequence of the forward primer is shown as SEQ ID No.5, and the sequence of the reverse primer is shown as SEQ ID No. 6.
The invention also provides a method for determining and regulating the candidate transcription factor expressed by the SSRG gene by utilizing co-expression analysis, which finds the transcription factor with a similar expression mode to the SSRG gene by analyzing the transcriptome of the endosperm of the wheat in the filling stage of the Ural chart through RNA-Seq.
The invention provides a method for detecting the regulation intensity of a transcription factor on an SSRG gene promoter region, which comprises the steps of co-transforming an overexpression vector of the transcription factor and a report vector of the SSRG gene promoter driving the expression of Firefly luciferase (Firefly luciferase) gene into a wheat protoplast cell, and detecting the intensity of the activity of the transcription factor regulating the SSRG gene promoter region by taking Renilla luciferase (Renilla luciferase) as an internal reference.
The invention provides a method for detecting the regulation and control of SSRG gene expression by transcription factor through endosperm overexpression, which comprises the steps of converting an overexpression vector of the transcription factor into endosperm 15 days after common wheat blossoms by a gene gun method, carrying out dark culture in a hypertonic culture medium for 48 hours, and detecting the change of SSR gene expression in the endosperm by RT-PCR.
The invention provides a Ular pattern wheatTubZIP2Can be used for up-regulating immature seeds of common wheatAGPL-cyto、AGPS-cytoAndSBEIIathe expression of the gene and finally the content of the total starch and the amylopectin of the mature seeds are improved. Its homologous gene in common wheatTabZIP2Has the same function. Due to the fact thatIn this way, the temperature of the molten steel is controlled,bZIP2has important significance for improving the starch quality of wheat.
Drawings
FIG. 1 shows a schematic view of aTubZIP2Evolutionary tree analysis, subcellular localization, transcriptional activation activity and expression pattern analysis. Wherein, A is the structure of TubZIP2, wherein 128-179 amino acids (aa) represent the core region of bZIP family transcription factor; b is an evolutionary tree analysis displayTubZIP2And homologous genes thereof are conserved in wheat families, and have a far relation with homologous genes from other families of the gramineae family; c is the N-terminal (1-127 aa) of TubZIP2 with transcriptional activation activity; d is TubZIP2 located in cell nucleus; e isTubZIP2In thatT. urartuPerforming specific expression in mature endosperm; f isTubZIP2And a part of the SSRG gene inT. urartuCo-expression in the grouting process.
FIG. 2TubZIP2In vitro enhancementAGPL-cyto、AGPS-cytoAndSBEIIatranscription of the gene. A is a schematic diagram of a report vector, an expression vector and an internal reference in a dual-luciferase reporter gene system, wherein REN: renilla luciferase; LUC: firefly luciferase; ubi: ubiquitin; p: a promoter; ter: and (6) terminating. B isTubZIP2Significant improvement in dual luciferase reporter systemsAGPL-cyto、AGPS-cytoAndSBEIIapromoter activity of the gene; c isTubZIP2A schematic representation of the overexpression of the vector in the endosperm; d isTubZIP2Increased overexpression in endospermAGPL-cyto、AGPS-cytoAndSBEIIatranscription of the gene.
FIG. 3TubZIP2Increasing wheat over-expression in linesAGPL-cyto、AGPS-cytoAndSBEIIathe level of transcription of the gene. A and B represent the results of RNA-seq and RT-PCR, respectivelyTubZIP2Overexpression in the immature endosperm of transgenic wheat; C. e and G are in endosperm 7 days, 14 days and 21 days after anthesis in RNA-seq analysis, respectivelyAGPL-cyto、AGPS-cytoAndSBEIIaa change in the level of transcription; D. f and H represent endosperm 7 days, 14 days and 21 days after RT-PCR validationAGPL- cyto、AGPS-cytoAndSBEIIachange in the amount of gene expression.
FIG. 4TubZIP2The total starch content and the amylopectin content of the overexpression system are improved. A isTubZIP2Remarkably improving the total starch content of the over-expression line planted in the 2017-plus 2018 Beijing, the dike and the Zhao county; b, finding that the number of A-type starch granules in the over-expression line seeds planted in Zhao county is more than that of wild type grains in scanning comparison by an electron microscope, wherein A and B respectively represent A-type and B-type starch granules; C. d and E are the amylopectin content, the amylose content and the ratio of amylose to amylopectin of the three-site overexpression lines, respectively; f is the higher peak viscosity of the overexpression line of Beijing in RVA analysis compared with the wild type.
FIG. 5 TubZIP2The thousand kernel weight and the grain width of the over-expression line grains are improved. A and B are respectively wild type and overexpression line plant and spike morphology; C. d and E are respectively the plant height, effective tillering and the number of spikelets per spike of the wild type and the overexpression line; f is the grain length and grain width shape of wild type and over-expression line grains; g isTubZIP2No influence on the grain length of the transgenic line; h and I are eachTubZIP2The grain width and thousand grain weight of the over-expression line are improved.
FIG. 6 TabZIP2In vitro enhancementAGPL-cyto、AGPS-cytoAndSBEIIatranscription of the gene. A isTabZIP2Specific expression in common wheat endosperm; b isTabZIP2AndAGPL-cyto、AGPS-cytoandSBEIIaco-expression; c isTabZIP2A schematic representation of the overexpression of the vector in the endosperm; d isTabZIP2Increased overexpression in endospermAGPL-cyto、AGPS- cytoAndSBEIIatranscription of the gene.
FIG. 7TabZIP2The total starch content and amylopectin content of the knockout line were reduced. A is Beijing, on the dike and Zhao countyTabZIP2The total starch content of the knockout system is obviously reduced; b, finding that the number of A-type starch grains in the knock-out seeds planted in Zhao county is less than that of wild type grains in electron microscope scanning comparison, wherein A and B respectively represent A-type and B-type starch grains; c is the amylopectin content of the three-site knockout line; d is the lower peak viscosity of the Beijing-planted knockout line compared to the wild type in the Rapid Viscometry (RVA) analysis; e and F show a significant reduction in grain width and thousand grain weight, respectively, for the knockout line.
Detailed Description
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1 Ural wheatTubZIP2And the evolutionary tree analysis, the subcellular localization, the transcriptional activation activity and the co-expression analysis of the SSR genes, and specifically comprises the following steps:
(1) wheat (Triticum aestivum L.)bZIP2Cloning of the genes: according toTRIUR3_00571The 5 'end and the 3' end of (3) and designed amplificationTubZIP2The primer of the coding region (the sequence of the forward primer is shown as SEQ ID No.5, the sequence of the reverse primer is shown as SEQ ID No. 6), and the cDNA of endosperm 15 days after the wheat blossom of the Ural chart is used as a template to clone to obtain the geneTubZIP2And the sequence is shown as SEQ ID No. 1. According toTubZIP2Sequence search IWGSC BLAST (https:// urgi. versalles. inra. fr/BLAST _ IWGSC @dbgroup=wheat_iwgsc_refseq_v1_chromosomes&program = blastn) and WheatExp BLAST (https:// was. pw. usda. gov/WheatExp /), usingTubZIP2The full-length primer takes the cDNA of the endosperm 15 days after the spring bloom of common wheat as a template,TubZIP2the full-length primer (the sequence of the forward primer is shown as SEQ ID No.5, and the sequence of the reverse primer is shown as SEQ ID No. 6) is subjected to PCR amplification and monoclonal sequencing to obtain the common wheatTabZIP2Three copies ofTabZIP-A2、TabZIP-B2AndTabZIP-D2the sequences of the two are respectively shown as SEQ ID No.2, SEQ ID No.3 and SEQ ID No. 4.
(2) And (3) analyzing the evolutionary tree: will be provided withTubZIP2AndTabZIP2and the amino acid sequences of genes with more than 80% sequence similarity in GenBank are compared by Clustal Omega (http:// www.ebi.ac.uk/Tools/msa/clustalo /) software, and then a evolutionary tree is constructed by Mega 5.05 (http:// www.megasoftware.net /), and the results are shown in FIG. 1B,TubZIP2and the homologous genes in the wheat family are independently gathered into a branch in the evolutionary tree analysis and are far away from the homologous genes from other families, which indicates thatbZIP2The genes are conserved in the wheat family.
(3) Detection of transcriptional activation Activity:TubZIP2the amino acid sequence was determined by NCBI Protein BLAST (https:// blast.ncbi.nlm.nih.gov/blast.cgi)PROGRAM=blastp&PAGE_TYPE=BlastSearch&LINK _ LOC = blastome), and analysis shows that TubZIP2 is a transcription factor of bZIP family, and comprises a basic leucoine zipper (bZIP) structural domain (128-179 aa), and the result is shown in FIG. 1A, wherein 128-179 aa of TubZIP2 is a DNA binding domain (bZIP domain). Recombinant plasmids were constructed by combining the full-length of TubZIP2 and the coding region sequences corresponding to fragments 1-127 aa, 128-179 aa and 180-574 aa, respectively, with pGBKT7 (Clontech, California, USA). Transformation of yeast strains AH109 (Clontech, California, USA) with the recombinant plasmids the results are shown in FIG. 1C, all strains grow normally on solid medium (SD/-Trp), but only strains transformed with the complete gene and the recombinant plasmid for the transcriptional activation region can turn X-gal blue, whereas strains transformed with the recombinant plasmid for the DNA binding region cannot turn blue. This indicates that TubZIP2 has transcriptional activation activity, and its N-terminal 1-127 aa functions for transcriptional activation activity.
(4) Subcellular localization: will be provided withTubZIP2The recombinant plasmid pJIT163-UBI-TubZIP2-hGFP fused with GFP is constructed by connecting to a pJIT163-UBI-hGFP vector, the protoplast cells of wheat leaves are transformed, and the expression of TubZIP2 fusion is realized under the drive of a ubitin promoter. The results are shown in FIG. 1D, TubZIP2 localized to the nucleus of protoplast cells.TubZIP2Localization in the nucleus indicates that it functions in the nucleus, consistent with the characteristics of transcription factors.
(5) Tissue-specific expression analysis: extracting total RNA of root, stem, leaf and endosperm 15 days after wheat blossom of Ural chart by Trizol methodTubZIP2Specific primers, their tissue-specific expression was verified by RT-PCR, the results are shown in FIG. 1E,TubZIP2expressed in large amounts in the endosperm.
(6) Wheat (Triticum aestivum L.)bZIP2Verification of Gene and SSRG Gene expression patterns: in the endosperm of the wheat in the filling stage of the Ural chart, the use ofTubZIP2And specific primers of partial SSRG genes, and the expression patterns of the two genes are verified by RT-PCR. The results are shown in figure 1F of the drawings,TubZIP2and expression of the selected SSRG gene peaked 5 days after the flower and then gradually decreased, which is consistent with the results of RNA-Seq.
Example 2 common wheatTabZIP2And tissue-specific expression and in vitro promotion of the SSRG GeneAGPL-cyto、AGPS-cytoAndSBEIIatranscription of (4).
(1) Tissue-specific expression analysis: extracting total RNA of root, stem, flag leaf, ear and endosperm of plant 15 days after spring bloom of common wheat TabZIP-A2、TabZIP-B2AndTabZIP-D2the specific primers of (1) were verified for their tissue-specific expression by RT-PCR, and the results are shown in FIG. 6A, in roots, stems, flag leaves, ears 15 days after flowering,TabZIP-B2there is a small amount of expression of the gene,TabZIP-A2andTabZIP-D2trace expression is present; in the endosperm 15 days after the flower,TabZIP-A2、TabZIP-B2andTabZIP-D2are abundantly expressed and are expressed inTabZIP-B2The expression level of (2) is highest.
(2)TabZIP2Validation of gene and SSRG gene expression patterns: RT-PCR is utilized to detect the endosperm of common wheat in the China spring filling stageTabZIP2And the expression pattern of the SSRG gene, as shown in FIG. 6B,TabZIP-A2、 TabZIP-B2andTabZIP-D2has the same expression pattern with partial SSRG gene, namely starting from 5 days after the flower and reaching the peak value 10 days after the flower, and then the expression quantity begins to decline; this also suggests that these three copies are involved in the regulation of the expression of the SSRG gene in Triticum aestivum.
Example 3 wheatbZIP2Function of the Gene
1. Wheat (Triticum aestivum L.)bZIP2Direct regulation of the SSRG Gene
(1) Dual luciferase reporter gene system detectionTubZIP2Regulation of SSR gene promoter: driven by the ubiquitin promoterTubZIP2(Ubi P:: TubZIP 2) in large scale, and constructionTubZIP2The expression vector of (1); promoter using SSRG Gene (-2000 bp to-1 bp)) Drives the expression of Firefly luciferase (Firefly luciferase) gene, constructs an expression vector (SSRG P:: LUC), and uses the vector as a reporter vector. The two recombinant vectors are co-transformed into wheat protoplast cells, a Renilla luciferase (Renilla luciferase) overexpression vector (Ubi P:: REN) is used as a control, the vector schematic diagram is shown in 2A, and LUC/REN represents the expression activity of an SSR gene promoter. Fluorescence intensity was measured using the Dual-Luciferase Reporter Assay System kit (Promega, Madison, USA) and Gloma 20/20 Luminometer (Promega, Madison, USA). The results are shown in figure 2B which shows,TubZIP2significantly improves the SSRG geneAGPL-cyto、AGPS-cytoAndSBEIIathe promoter activity of (1).
(2)bZIP2Endosperm over-expression of (a): the pJIT163-UBI-hGFP vector (ampicillin resistance), supplied by Cabernet Gaussler, institute of genetics and developmental biology, of the Chinese academy of sciences, driven the expression of GFP by the ubiquitin promoter. Will be provided withTubZIP2、TabZIP-A2、TabZIP-B2AndTabZIP-D2respectively recombined in pJIT163-UBI-hGFP vector, and the ubiquitin promoter in the vector is drivenbZIP2For high-level expression, the vector schemes are shown in FIGS. 2C and 6C, respectively.
Disinfecting seeds of common wheat 15 days after spring flowering in China with 70% alcohol, bombarding endosperm with a gene gun to realize transient expression of the recombinant plasmid in the endosperm, and then culturing the recombinant plasmid in a hypertonic culture medium for 48 hours in a dark place; extracting total RNA of endosperm, and performing reverse transcription to obtain cDNA; RT-PCR validationTubZIP2、TabZIP-A2、TabZIP-B2AndTabZIP-D2the transient expression and its effect on the expression of the SSRG gene are shown in FIG. 2D: (TubZIP2) It is shown that, compared with the wild-type endosperm introduced with the empty plasmid,TubZIP2can be obviously improvedAGPL-cyto、AGPS-cytoAndSBEIIa the promoter activity of (a);TabZIP2the results of (a) are shown in figure 6D,TabZIP-A2、TabZIP-B2andTabZIP-D2can both up-regulate the expression of the SSRG gene, in whichTabZIP-B2The strength of the up-regulation of (a) is the maximum,TabZIP-D2the effect is not obvious.
Wheat (Triticum aestivum L.)TubZIP2Overexpression line RNA-seq and phenotype identification (1) wheat transgenic plant screening:construction and utilizationGlu-1Bx14Promoter driveTubZIP2The over-expression carrier makes the transcription factor specifically express in kernel endosperm, and makes gene gun transformation on the transgenic platform of institute of genetics and developmental biology of Chinese academy of sciences, the obtained transformed seedling is planted in greenhouse, and according to the conventional method, its genome DNA is slightly extracted, 100 ng of genome DNA is taken as template, and the primer pair (shown by SEQ ID No.5 and SEQ ID No. 6) is used, and utilizes the wild type wheat genome DNA as control to make conventional PCR amplification so as to further detect positive plant. Homozygous selfing to T2Transgenic wheat of the generations was used for subsequent experiments.
(2) And (3) taking materials of endosperm 7 days, 14 days and 21 days after the flowering respectively, quickly freezing and storing the materials by using liquid nitrogen, placing the materials in a refrigerator at the temperature of-80 ℃, extracting RNA by using Trizol, and performing transcriptome sequencing (RNA-seq) on three repeated samples. Simultaneously reverse transcribing the RNA to cDNATa4045(ubiquinol-cytochrome C reaction enzyme ron-sulfurr subunit) as a control, and the expression of the SSRG gene was verified by RT-PCR using a primer specific to the SSRG gene. The results are shown in FIG. 3A and FIG. 3B, and the results of RNA-seq and RT-PCR validation both showTubZIP2Expression was significantly upregulated in all three phases; FIGS. 3C and 3D showTubZIP2No obvious regulation effect is realized 7 days after the flowers bloom; as shown in figures 3E and 3F,TubZIP2can be remarkably increased at 14 days after the flower blossomAGPL-cyto、AGPS-cytoAndSBEIIaexpression of the gene; FIGS. 3G and 3H show that the gene has reduced regulation and is mainly up-regulated 21 days after floweringSBEIIaExpression of the gene.
(3) And (3) determining the total starch content of the mature seeds: total starch content was determined by means of a Total starch kit (K-TSTA; Megazyme). The results are shown in fig. 4A, where the total starch content of wheat over-expressed lines was significantly increased in three locations, beijing, hebeibei embankment and zhao county, compared to wild type, with an average increase of about 2.88%, 4.93% and 4.38% for three lines OE82, OE85 and OE87, respectively.AGPS-cytoAndAGPL-cytois the rate-limiting enzyme in the starch biosynthesis pathway, and the increase in total starch content is associated with an increase in the transcription level of both transgenic lines.
(4) Scanning mature seeds by an electron microscope: and transversely cutting the mature seeds of the wild wheat and the over-expression wheat by using a blade, and scanning the transverse section by using an electron microscope. As shown in fig. 4B, the over-expressed line had more type a starch granules, which is consistent with an increase in total starch content.
(5) And (3) determining the amylose content of the mature seeds: and (3) measuring the amylose content of the over-expression system and wild flour by using a DPCZ-II type amylose analyzer, wherein the difference value of the total starch content and the amylose content is the amylopectin content. As shown in FIG. 4C, the amylopectin content of the three site-overexpressed lines was significantly higher than that of the wild type, with an average increase of 4.79% for OE82 and 8.06% and 7.50% for OE85 and OE87, respectively, which is associated with the resultsSBEIIaThe catalytic synthesis of the amylopectin is consistent. There was no difference in amylose content on the hebei embankment and the zhao county (9.57% reduction in OE87 in zhao county), but the amylose content of OE82, OE85 and OE87 in the beijing area was reduced by 7.15%, 5.02% and 5.60%, respectively, as shown in fig. 4D. The values for three over-expressed amylose/amylopectin from three sites were significantly reduced due to the increased amylopectin content and the steady and even reduced amylose content (no significant change in amylose/amylopectin from OE82 on embankment and zhao county), as shown in fig. 4E.
(6) Overexpression lines mature seed RVA characteristics: rapid Viscometers (RVA) are widely used to evaluate the gelatinization properties of starch, and the peak viscosity produced by RVA is inversely related to the amylose to amylopectin ratio, consistent with a decrease in the straight-to-branched ratio, as shown in fig. 4F, with a significant increase in the peak viscosity for both over-expressed lines of wheat grown in beijing. .
(7) Plant phenotype identification of over-expressed line wheat: the characteristics of transgenic wheat in three places are investigated, and as shown in fig. 5A, 5B and 5F, the characteristics of plants, ears and grains of wild type and overexpression lines are respectively represented; FIGS. 5C, 5D and 5E show no significant differences in plant height, effective tillering and number of spikelets per plant and wild type, respectively, for the over-expressed lines; fig. 5G, 5H and 5I show grain length, grain width and thousand kernel weight, respectively, of the kernel, where there was no significant difference in grain length, and both grain width and thousand kernel weight of the over-expressed lines were higher than wild type. Wherein the grain width increase amplitude of OE85 is maximum and is as high as 6.62%, and the increase amplitude of OE82 is minimum and is only 3.72%. The increase in grain width caused a change in thousand kernel weight of the kernels, with an average increase in the thousand kernel weight of OE85 of the most, up to 13.50%, and an average increase in OE82 and OE87 of 6.98% and 11.46%.
Wheat (Triticum aestivum L.)TabZIP2Phenotypic characterization of knockout lines
(1) Determining the total starch content of mature seeds of the knockout line: 2017 and 2018 wheat planted in Beijing, Hebei dyke and Zhao countyTabZIP2Knock-out line T2The passage line was used for subsequent assays. Total starch content was determined by means of a Total starch kit (K-TSTA; Megazyme). As shown in FIG. 7A, the total starch content of the knockout lines in Beijing, Dingshang and Zhao county locations was significantly lower than that of the wild type, bZIP2kn-ab 、bZIP2kn-abd1 and bZIP2knAn average reduction of 4.18%, 5.69% and 5.75% for-abd 2.
(2) Electron microscopy scanning of knockout line mature seeds: mature seeds of wild wheat and knockout wheat are transversely cut by a blade, the transverse section is subjected to electron microscope scanning, and the A, B type starch grain distribution of the seeds is changed along with the reduction of total starch. As shown in fig. 7B, the knockout line contained fewer a-type starch grains.
(3) Determining the amylose content of mature seeds of the knockout line: measuring amylose content of wild type and knockout line flour with DPCZ-II type amylose analyzer, wherein the difference between total starch content and amylose content is amylopectin content, as shown in FIG. 7C, the amylopectin content of knockout line at three positions except bZIP2 on dikeknNo apparent ab change, three lines in the other three sites showed a decrease, bZIP2kn-ab average decrease 3.42%, bZIP2kn-abd1 and bZIP2knThe decrease of-abd 2 was 5.57% and 10.10%, respectively. Reduction of Total starch content and amylopectin content and knock-out linesTabZIP2To pairTaAGPL-cyto、TaAGPS-cytoAndTaSBEIIathe transcriptional activity was consistently decreased. (4) RVA characteristics of knockout line mature seeds: analysis of the flour viscosity by RVA, as shown in figure 7D, the peak viscosity of the knockout line was significantly lower than the wild type. A decrease in amylopectin content in the knockout line causes a significant decrease in the peak viscosity of the RVA.
(5) Knockout line mature seed kernelShape: as shown in FIGS. 7E and 7F, the grain width and thousand grain weight of the three spot knockout lines were significantly lower than the wild type, where bZIP2kn-ab、bZIP2kn-abd1 and bZIP2knThe average grain width of abd2 decreased by 3.79%, 5.40% and 5.78%, corresponding to an average reduction in thousand kernel weight of 9.19%, 14.78% and 15.30%.TabZIP2In knockout linesTaAGPL-cyto、TaAGPS-cytoAndTaSBEIIathe transcription activity of the compound enzyme is reduced, so that the total starch content and the amylopectin content of mature grains are reduced, the grain width of the grains is obviously reduced, and the thousand grain weight of the grains is further obviously reduced compared with the wild type.
<110> institute of genetics and developmental biology of Chinese academy of sciences
<120> transcription factor bZIP2 for improving total starch content and amylopectin content of wheat grains and application thereof
<160> 6
<210> 1
<211> 1722
<212> CDS
<213> TubZIP2, Triticum aestivum L.)
<400> 1
ATGGCCATCG CGGAGGCGTC CCCCTTCGCG GACCTGCCCT TCCCCGACGA CCTGCCGGAG TTCCCGCACG GCCCCGTCGG GGACGACGAC GCCTTCGCCC TGGACGGCTT CGATCTCGAC GATCTGGACA TCGACTTCGA CTTCGACCTC GACCTCGACC TCCTCCCCAC CGACGACGTG CGGCTCCCGT CGCCGCCGCC GCCGCTCGCC ACGTCCTCCT CCTCGGCCGG GTCGCCGGGC GGGGCAGGGG ACTCCTCCTC CGGCTCCGGT GGCGGAGCGG ACGGCGGCCT GAAGAACGAC GAGTCCTCGG AGACGTCTTC GAGGAGCGCG AGCGCTGGGA GCGACGGCAA GGCTAAGGAG GGGGAGGGTG AGGACGACAA GCGGCGGGCG CGGCTGGTGC GGAACCGGGA GAGCGCGCAC CTGTCGCGGC AGAGGAAGAA GCAGTACGTG GAGGAGCTGG AGGGGAAGGT CAAGGCCATG CAGGCCACCA TCGCCGACCT CTCCACCAGG ATCTCCTGCG TCACTGCTGA GAACGCCGCT CTCAAGCAGC AACTGGCCGG TGCTGGTGGA GCAGGCGTCC CGCCGCCGCT GCCGATGTAC CCGGGATTGT ACCCTTTGCC GCTGCCATGG ATGCACCCGG CTTATGCGAT GGGAGCGCGC GGCTCCCAAG TGCCGCTCAT GCCGATACCT CGGCTGAAAA CCAAGCAGCC TGCGTCGGCT GCCGCAGAGC CACCGGCCAA GAAGTCTAGG AAGACCAAGA AGGTTGCCAG TGTTAGCCTC CTTGGATTGC TGTTCCTGAC GATGCTCTGT GGGTGTTTGG TTCCTGCGGT AAATCGGATG TATGGAGCAG TTGATTCCCG AGAAGGAATT GTGCTTGGTC CATCACAATC ACGTCATGGG AGGGTTCTGG CTGTTGACGG GCCTCGAGAT GGTGTCCCGG AAGGTGTTGA TTCGAAGTTG CCACATAATT CAAGTGAGAC GCTCCCGGCC TTGTTGTATA TTCCAAGGAA TGGGAAGCAT GTCAAGATCA ATGGAAATCT TGTTATCCAG TCTGTTGTTG CGAGTGAGAA AGCTTCTTCG CGCATGTGTC ACTCTGATGG GAAGACTTCA TGTAACCAAG GACAAGAAGA TACTAGTTTG GCAATTCCTG GCCATGTTGC TCAGTTGAAT TCTGGAGAAG TCATGGAATC TGCTAAAGCA ATAAAAAATA AACTGATGGC TTTACCTCCT GGAGATGGAA GCATATACAG AGACGATGAT GAATTACTGC CACAATGGTT TAGTGAAGCA ATGTCAGGTC CTATGTTGAG TTCCGGAATG TGCACCGAAG TGTTCCAGTT TGATATATCG CCGACCACCA TTGTTCCTGT CTACTCCAGT GGTATGCACA ATGCATCACA TAACTCCACG GAGAACCTCC CCTCCAGTCA GTCCCATAAG GTCAAGAACA GAAGGATTTT ACATACCATG GCCGTTCCCC TAAAAGGTTC AACGTCCAAC CACACCGATC ACCTCAAAGC GCACCCCAAG AACGAGAGCT TTGCTGGAAA GAAACCGGCT TCATCGGTGG TGGTCTCTGT CCTGGCTGAC CCTAGAGTGG ATGCTGATGG AAGGATCTCT TCGAAGTCAT TGTCGCGTAT ATTTGTTGTA GTCCTCGTTG ACAGTGTAAA GTATGTCACT TACTCTTGCG TCCTGCCGTT CAAAACCCAT AGCCCTCATC TG
<210> 2
<211> 1722
<212> CDS
<213> TabZIP-A2, Triticum aestivum L.)
<400> 2
ATGGCCATCG CGGAGGCGTC CCCCTTCGCG GACCTGCCCT TCCCCGACGA CCTGCCGGAG TTCCCGCACG GCCCCGTCGG GGACGACGAC GCCTTCGCCC TGGACGGCTT CGATCTCGAC GATCTGGACA TCGACTTCGA CTTCGACCTC GACCTCGACC TCCTCCCCAC CGACGACGTG CAGCTCCCGT CGCCGCCGCC GCCGCTCGCC ACGTCCTCCT CCTCGGCCGG GTCGCCGGGC GGGGCAGGGG ACTCCTCCTC CGGCTCCGGT GCCGGAGCGG ACGGCGGCCT GAAGAACGAC GAGTCCTCGG AGACGTCTTC CAGGAGCGCG AGCGCTGGAA GCGACGGCAA GGCTATGAAC GGGGAGGGTG AGGACGACAA GCGGCGGGCG CGGCTGGTGC GGAACAGGGA GAGCGCACAC CTGTCGCGGC AGAGGAAGAA GCAGTACGTG GAGGAGCTGG AGGGGAAGGT CAAGGCCATG CAGGCCACCA TCGCCGACCT CTCCACCAGG ATCTCCTGCG TCACGGCTGA GAACGCCGCT CTCAAGCAGC AACTGGCCGG TGCCGGTGGC GCAGGCGTCC CGCCGCCGCT GCCGATGTAC CCTGGATTGT ACCCTTTGCC GCTGCCATGG ATGCACCCGG CTTATGCGAT GGGAGCGCAC GGCTCCCAAG TGCCGCTCAT GCCGATACCT CGGCTGAAAA CCAAGCAGCC TGCGTCGGCT GCCGCAGAGC CACCGGCCAA GAAGTCTAGG AAGACCAAGA AGGTTGCTAG TGTTAGCCTC CTTGGATTGC TGTTCCTGAT GATGCTCTGT GGGTGTTTGG TTCCTGCGGT AAATCGGATG TATGGAGCAG TTGATTCCCG AGAAGGAATT GTGCTTGGTC CATCACAATC ACGTCATGGG AGGGTTCTGG CTGTTGACGG GCCTCGAGAT GGTGTCTTGG AAGGTGTTGA TTCGAAGTTG CCGCATAATT CAAGTGAGAC GCTCCCGGCG TTGTTGTATA TTCCTAGGAA TGGGAAGCAT GTCAAGATCA ATGGAAATTT GGTTATCCGG TCTGTTGTTG CGAGTGAGAA AGCCTCTTCG CGCATGTGTC ACTCTGATGG GAAGACTTCA TGTAACCAAG GACAAGAAGA TACTAGTTTG GCAATTCCTG GCCATGTTGC TCAGTTGAAT TCTGGAGAAG TCATGGAATC TGCTAAAGCA ATAAAAAATA AACTGATGGC TTTACCTCCT GGAGATGGAA GCATATACAG AGACGATGAT GAATTACTGC CACAATGGTT TAGTGAAGCA ATGTCAGGTC CTATGTTGAG CTCCGGAATG TGCACCGAAG TGTTCCAGTT TGATATATCG CCGACCACCA TTGTTCCTGT CTACTCCAGT GGTATGCACA ACGCATCACA TAACTCCACG GAGAACCTCA CCTCCAGTCA GTCCGATAAG GTCAAGAACA GAAGGATTTT ACATTCCATG GCCGTTCCCC TAAAAGGTTC AACGTCCAAC CACACCGATC ACCTCAAAGC GCACCCCAAG AACGAGAGCT TTGCTGGAAA CAAACCGGCT TCATCAGTGG TGGTCTCTGT CCTGGCTGAC CCGAGAGTGG ACGCTGATGG AAGGATCTCT TCGAAGTCAT TGTCGCGTAT ATTTGTTGTA GTCCTTGTTG ACAGTGTAAA GTATGTCACT TACTCTTGCG TCCTGCCGTT CAAAACCCAT AGCCCTCATC TG
<210> 3
<211> 1722
<212> CDS
<213> TabZIP-B2, Triticum aestivum L.)
<400>3
ATGGCCCTCG CGGAGGCGTC CCCCTTCGCG GACCTGCCCT TCCCCGACGA CCTGCCGGAG TTCCCGCACG GCCCCGTCGG GGACGACGAC GCCTTCGCCC TGGACGGCTT CGATCTCGAC GATCTGGACA TCGACTTCGA CTTCGACCTC GACCTCGACC TCCTCCCCAC CGACGACGTG CAGCTCCCGT CGCCCCCACC GCCGCTCGCC ACGTCCTCGT CCTCGGCCGG GTCGCCGGGC GGGGCAGGGG ACTCCTCCTC CGGCTCAGGT GGCGGAGCGG ACGGCGCCCT GAAGAACGAC GAGTCCTCGG AGACGTCTTC CAGGAGCGCG AGCGCTGGGA GCGACGGCAA GGCTAAGGAC GGGGAGGGTG AGGACGACAA GCGGCGGGCG CGGCTGGTGC GGAACCGGGA GAGCGCGCAT CTGTCGCGGC AGAGGAAGAA GCAGTACCTC GAGGAGCTGG AGGGGAAGGT CAAAGCCATG CAGGCCACCA TCGCCGACCT CTCCACCAGG ATCTCCTGCG TCACTGCCGA GAACGCTGCT CTCAAGCAGC AGCTGGCTGG CGCCGGTGGC GCAGGCGTCC CCCCGCCGCT GCCGATGTAC CCCGGATTGT ACCCTTTGCC ACCGCCATGG ATGCACCCTG CTTATGCGAT GGGAGCGCGC GGCTCCCAAG TGCCGCTCAT GCCCATACCT CGGCTGAAAA CCAAGCAGCC TGCGTCGGCT GCCGCAGAGC CACCGGCCAA GAAGTCTAGG AAGACCAAGA AGGTTGCCAG TGTTAGCCTC CTTGGATTGC TGTTCCTGAT GATGCTCTGC GGGTGTTTGG TTCCTGCAGT AAATCGGATG TATGGACCAG TTGATTCCCG AGAAGGAATT GTGCTTGGTC CTTCACAATC ACGTCATGGG AGGGTTCTGG CTGTTGATGG GCCTCGAGAT GGTGTCTCGG AAGGTGTTGA TTCGAAGTTG CCACATAATT CAAGTGAGAC GCTCCCGGCA TTGTTGTATA TTCCGAGGAA TGGGAAACAT GTCAAGATCA ATGGTAATCT TGTTATCCAG TCTGTTGTTG CGAGTGAGAA AGCTTCTTCA CGCATGTGTC ACTCTGATGG GAAGACTTCA TGTAACCAAG GACAAGAAGA TACTAGTTTG GCAATTCCTG GCCACGTTGC TCAGTTGAAT TCTGGAGAAG TCATGGAATC TGCTAAAGCA ATAAAAAATA AACTGATGGC TTTACCTCCT GGAGATGGAA GCATATACAG AGAGGATGAT GAATTACTGC CACAATGGTT TAGTGAAGCA ATGTCAGGTC CTATGTTGAG CTCTGGAATG TGCACCGAAG TGTTCCAGTT TGATATATCG CCAACCACCA TTGTTCCTGT CTACTCCAGT GGTATGCACA ACGCATCACA TAACTCCACG GAGAACCTCC CCTCCAGTCA GTCCCATAAG GTCAAGAACA GAAGGATTTT ACATTCCATG GCCATTCCCC TAAAAGGTTC AACGTCCAAC CACACCGATC ACCTCAAAGC GCACCCCAAG AACGAGAGCT TTGCTGGAAA CAAACCGGCT TCATCGGTGG TGGTCTCTGT CCTGGCTGAC CCTAGAGTGG ATGCTGATGG AAGGATCTCT TCGAAGTCAT TGTCGCGTAT ATTTGTTGTA GTCCTTGTTG ACAGTGTAAA GTATGTCACT TACTCTTGCG TCCTGCCGTT CAAAACCCAT AGCCCTCATC TG
<210> 4
<211> 1722
<212> CDS
<213> TabZIP-D2, Triticum aestivum L.)
<400> 4
ATGGCCATCG CGGAGGCGTC CCCCTTCGCG GACCTGCCCT TCCCCGACGA CCTGCCGGAG TTCCCGCACG GCCCCGTCGG GGACGACGAC GCGTTCGCCC TGGACGGCTT CGATCTCGAC GATCTGGACA TCGACTTCGA CTTCGACCTC GACCTCGACC TCCTCCCCAC CGACGACGTG CAGCTCCCGT CGCCGCCGCC GCCGCTCGCC ACGTCCTCGT CCTCGGCCGG GTCGCCGGGC GGGGCAGGGG ACTCCTCCTC CGGCTCCGGT GGCGGAGCGG ACGGCGGCCT GAAGAACGAC GAGTCCTCGG AGACGTCTTC CAGGAGCGCG AGCGCTGGGA GCGACGACAA GGCTAGGGAT GGGGAGGGTG AGGACGCCAA GCGGCGCGCG CGGCTGGTGC GGAACAGGGA GAGCGCGCAC CTGTCGCGGC AGAGGAAGAA GCAGTACGTG GAGGAGCTGG AGGGGAAGGT CAAAGCCATG CAGGCCACCA TCGCCGATCT GTCCACCAGG ATCTCCTGTG TCACCGCCGA GAACGCTGCT CTCAAGCAGC AACTGGCTGG CGCAGGTGGT GCAGGGGTCC CGCCGCCGCT TCCTATGTAC CCAGGATTGT ACCCTTTGCC ACCGCCATGG ATGCACCCGG CTTATGCGAT GGGAGCGCGC GGCTCCCAAG TGCCGCTCAT GCCGATACCT CGGCTGAAAA CCAAGCAGCC TGCGTCGGCT GCCGCAGAGC CACCGGCCAA GAAGTCCAGG AAGACCAAGA AGGTTGCGAG TGTCAGCCTC CTTGGATTGT TGTTACTGAT GATGCTCTGC GGGTGTTTGG TTCCTGCGGT AAATCGGATG TATGGAGCAG TTGATACTCG AGAAGGAATT GTGCTTGGTC CATCACAATC ACGTCATGGG AGGGTTCTGG CTGTTGATGG GCCTCGAGAT GGTGTCTCGG AAGGTGTTGA TTCGAAGCTG CCACATAATT CAAGTGAAAA GCTCCCGGCG TTGTTGTATA TTCCAAGGAA TGGGAAGCAT GTCAAGATCA ATGGAAATCT TGTTATCCAG TCTGTTGTTG CGAGTGAGGA AGCTTCTTCG CGCATGTGTC ACTCTGATGG GAAGACTTCA TGTAACCAAG GGCAAGAAGA TACTAGTTTG GCAATTCCTG GCCATGTTGC TCAGTTGAAT TCTGGAGAAG TCATGGAATC TGCCAAAGCA ATAAAAAACA AACTGATGGC TTTACCTCCT GGAGATGGAA GCATATACAG AGACGATGAT GAATTACTGC CACAATGGTT TAGTGAAGCA ATGTCAGGTC CTATGTTGAG CTCCGGAATG TGCACCGAAG TGTTCCAGTT CGATATATCA CCGACCACCA TTGTTCCTGT CTACTCCAGT GGTATGCACA ACGCATCACA TAACTCCACG GAGAACCTCC CCTCCAGTCA GTCCCATAAG GTCAAGAACA GAAGGATTTT ACATTCCATG GCCATTCCCC TAAAAAGTTC AACGTCCAAC CACACCGATA ACCTCAAAGC GCACCCCAAG AACGAGAGCT TTGCTGGAAA CAAACCGGCT TCATCGGTGG TGGTCTCTGT CCTGGCTGAC CCTAGAGTGG ATGCTGATGG AAGGATCTCT TCGAAGTCAT TGTCGCGTAT ATTTGTTGTG GTCCTTGTTG ACAGTGTAAA GTATGTCACT TACTCTTGCG TCCTGCCGTT CAAAACCCAT AGCCCTCATC TG
<210> 5
<211> 20
<212> DNA
<213> artificially synthesized sequence
<400> 5
ATGGCAGACCACCTTCAAGT
<210> 6
<211> 22
<212> DNA
<213> artificially synthesized sequence
<400> 6
TCAGTACTTCCACATGCCATCC
Claims (5)
1. The application of the transcription factor for improving the synthesis of the seed starch in improving the expression of the SSRG gene in the filling stage in wheat is characterized in that: the transcription factor isTubZIP2A gene or isTubZIP2Gene homology gene in common wheatTabZIP2Two copies of (a):TabZIP-A2、TabZIP-B2saidTubZIP2Gene, gene,TabZIP-A2Gene, gene,TabZIP-B2The coding region of the gene consists of nucleotide sequences shown by SEQ ID No.1, SEQ ID No.2 and SEQ ID No.3 respectively.
2. The use of claim 1, wherein: transforming the transcription factor into wheat, and screening a positive transgenic line over expressing the transcription factor.
3. The application of the transcription factor for improving the synthesis of the seed starch in improving the expression of the SSRG gene and promoting the accumulation of the starch in the wheat is characterized in that: converting the over-expression vector of the transcription factor into common wheat, and screening to obtain a positive transgenic line with increased starch content; the transcription factor isTubZIP2A gene or isTubZIP2Gene homology gene in common wheatTabZIP2Two copies of (a):TabZIP-A2、TabZIP-B2saidTubZIP2Gene, gene,TabZIP-A2Gene, gene,TabZIP-B2The coding region of the gene consists of nucleotide sequences shown by SEQ ID No.1, SEQ ID No.2 and SEQ ID No.3 respectively.
4. Use according to claim 3, characterized in that: the transcription factor isTubZIP2。
5. The application of the transcription factor for improving the synthesis of the seed starch in reducing the expression of the SSRG gene and the starch accumulation in common wheat is characterized in that: the transcription factor isTubZIP2A gene or isTubZIP2Gene homology gene in common wheatTabZIP2Two copies of (a):TabZIP-A2、TabZIP-B2saidTubZIP2Gene, gene,TabZIP-A2Gene, gene,TabZIP-B2The coding regions of the genes respectively consist of nucleotide sequences shown in SEQ ID No.1, SEQ ID No.2 and SEQ ID No.3, and the genes are knocked out by using CRISPR/Cas9 technologyTabZIP2Two copies of (a):TabZIP-A2、TabZIP-B2and screening out positive transgenic lines.
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CN114807163B (en) * | 2022-03-28 | 2023-08-25 | 河南农业大学 | Application of TaSBE I Gene in Promoting Wheat Starch Synthesis |
CN117866983B (en) * | 2024-03-11 | 2024-05-07 | 浙江大学海南研究院 | Application of OsbZIP10 gene in regulation of amylose content of rice grains |
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