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Soybean chalcone reductase gene CHR3 and applications thereof

A reductase and gene technology, applied in the field of biosynthesis of plant secondary metabolite daidzein, can solve problems related to unclear synthetic ability

Inactive Publication Date: 2013-10-02
JILIN AGRICULTURAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is only one soybean reductase gene CHR1 whose function can be confirmed in GENEBANK in the United States
So far, there is no conclusion about the type and quantity of chalcone reductase (CHR) in soybean, and it is not clear that different types of chalcone reductase (CHR) are related to the synthesis ability of daidzein in plants

Method used

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  • Soybean chalcone reductase gene CHR3 and applications thereof
  • Soybean chalcone reductase gene CHR3 and applications thereof
  • Soybean chalcone reductase gene CHR3 and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Cloning of Soybean Chalcone Reductase Gene CHR3

[0021] The soybean variety "Jinong 17" (seeds provided by the Biotechnology Center of Jilin Agricultural University) was selected and planted in the field. When the plants grew to the flowering stage, the leaf tissue was selected, and the total RNA was extracted using the kit RNAiso Plus, and followed by the American Fermentas company. Reverse transcription was performed according to the instructions of the reverse transcription kit, and the first strand of cDNA was synthesized. Primers P1 and P2 were designed according to an incomplete gene fragment of unknown function (No. TC227002) contained in the soybean EST library of the National Center for Biological Information (NCBI). RT-PCR was used to amplify specific fragments using cDNA as a template. Then, the RACE kit from TAKARA Company was used to clone the 3' end fragment and the 5' end fragment of the target gene respectively. After the sequences at both...

Embodiment 2

[0027] Example 2 Construction of Plant Expression Vector PBI121-CHR3 Gene

[0028]The gene sequence of the open reading frame was predicted by the special analysis software on the website of the National Center for Biological Information (NCBI), and the predicted result was a fragment with a length of 969 bp, and the open reading frame was at 1-969 bp. According to the cDNA sequence of soybean chalcone reductase CHR3 gene, design primers with restriction enzyme sites and amplify the complete coding reading frame, add XbaⅠ enzyme site at the upstream, add BamHI enzyme site at the downstream, and add a BamHI enzyme site at the upstream Primer: GGG TCTAGA ATGGCAGGAAAGAAAATC, downstream primer: TTT GGATCC TCAAACGTCTCCATCCC, using the cDNA obtained in Example 1 as a template for PCR amplification, and connecting the amplified fragment of CHR3 with upstream and downstream restriction sites to the PMD-18T vector . Then digest the plasmid vector of the CHR3 gene with XbaⅠ / BamHI coh...

Embodiment 3

[0030] Example 3 Cultivation of Transformed CHR3 Gene Tobacco

[0031] Then the recombinant expression vector pBI121-CHR3 was transformed into competent Agrobacterium DH105 by heat shock method. Tobacco explants were prepared for transformation with Agrobacterium. Select tobacco seeds with full grains, sterilize them with 70% alcohol and 5% sodium hypochlorite solution, wash them with sterile deionized water, inoculate them on the tobacco germination medium, and cultivate them in a bright place for 15 days; transform Agrobacterium in YEP The liquid medium was cultured with shaking at 28°C until the OD600 value was 0.6-0.8, and the bacteria were collected by centrifugation and resuspended with MS liquid medium. Cut off the sprouted tobacco 1cm 2 Leaves of the same size and punched a number of holes, put them into the MS medium containing transformed Agrobacterium and suspended them for 8 minutes, then placed the leaves on the common medium of tobacco, and cultivated them in...

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Abstract

The invention discloses a soybean chalcone reductase gene CHR3 and applications thereof. CHR3 gene is a novel chalcone reductase gene in soybean. Tests have testified that the expression product of the CHR2 gene is capable of catalyzing to synthesize isoliquiritigenin. CHR3 is originated from soybean, and has optimized codon, which is suitable for dicotyledons such as soybean. CHR3 gene engineering acceptor is mainly suitable for dicotyledons such as soybean, tobacco, cotton, and the like, and is also suitable for monocotyledons such as paddy rice, wheat, corn, and the like. CHR3 gene can be induced into plants as a target gene to catalyzed synthesis of isoliquiritigenin, which is a necessary precursor substance for biological synthesis of daidzein, and daidzein content is increased in the plants. Daidzein is a plant defensin, which can improve the disease resistance of plants, has prevention and curative functions on a plurality of human diseases, and is also a very good health-care product.

Description

technical field [0001] The invention relates to soybean chalcone reductase gene CHR3 and its application in genetic engineering. The invention belongs to the field of genetic engineering, and specifically relates to the biosynthesis of plant secondary metabolite daidzein. technical background [0002] Rapid amplification of complementary DNA ends (RACE technology) is a molecular biology technique that completely separates and clones the 3' and 5' ends of incomplete genes. So far, with the rapid development of library construction technology and high-throughput sequencing technology, more and more nucleic acid fragments have been isolated and sequenced. However, the problem is that the integrity and functionality of nucleic acid fragments still require a lot of experimental work to determine, and continue to explore and discover genetic resources that are beneficial to human practical use. [0003] Daidzein is one of the main components of soybean isoflavones, accounting fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N15/53C12N15/84A01H5/00
Inventor 王丕武张卓付永平王鑫雨马建刘思言张超魏洪波吴楠李丹
Owner JILIN AGRICULTURAL UNIV
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