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Lilium regale WRKY transcription factor gene LrWRKY4 and application thereof

A transcription factor and gene technology, applied in application, genetic engineering, plant genetic improvement and other directions, can solve the problems affecting the yield and quality of cut lily flowers, scale rot and shedding, and the quality of seed bulbs, and achieve broad market application prospects and breeding cycles. The effect of shortening, reducing usage

Active Publication Date: 2020-01-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fusarium infection of lily bulbs causes basal necrosis and scale rot and falls off, resulting in a decline in bulb quality; leaves turn yellow, wilt and droop after plants are infected with Fusarium, and plants wither and die early, seriously affecting the yield and quality of lily cut flowers

Method used

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  • Lilium regale WRKY transcription factor gene LrWRKY4 and application thereof
  • Lilium regale WRKY transcription factor gene LrWRKY4 and application thereof
  • Lilium regale WRKY transcription factor gene LrWRKY4 and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: LrWRKY4 Full-length gene cloning and sequence analysis

[0021] The roots of lily were inoculated with Fusarium oxysporum, total RNA was extracted from the root 24 h after inoculation, the treated root of lily was ground into powder with liquid nitrogen, then transferred into a centrifuge tube, and extracted by guanidine isothiocyanate method Total RNA; M-MLV reverse transcriptase (promega) was used to synthesize the first strand of cDNA using total RNA as a template. The reaction system and operation process were as follows: take 5 μg Total RNA, add 50 ng oligo (dT), 2 μL dNTP Mix ( 2.5mM each), the reaction volume was made up to 14.5 μL with DEPC water; after mixing, heat denaturation at 70°C for 5 min, then rapidly cool on ice for 5 min, then add 4 μL 5×First-stand buffer, 0.5 μL RNasin (200U), 1 μL M-MLV (200U), mix well and centrifuge briefly, incubate at 42°C for 1.5 h, take it out and heat at 70°C for 10 min to terminate the reaction; after the first ...

Embodiment 2

[0024] Embodiment 2: plant overexpression vector construction

[0025] Use the SanPrep column plasmid DNA mini-extraction kit (Shanghai Sangong) to extract the insert LrWRKY4 coli plasmid pGEM-T- LrWRKY4 As well as the plasmid of the plant expression vector pCAMBIA2300S, take 1 μL for agarose gel electrophoresis to detect the integrity and concentration of the extracted plasmid; Xba I and Eco RI respectively for plasmid pGEM-T- LrWRKY4 and pCAMBIA2300S for double enzyme digestion (100 μL system), the reaction system and operation process are as follows: take 20 μL pGEM-T- LrWRKY4 and pCAMBIA2300S plasmid, add 10μL 10×M buffer, 5μL Xba I, 5 μL Eco RI, 60 μL ddH 2 O, after mixing, centrifuge for a short time, and place at 37°C for overnight reaction. All digested products were subjected to agarose gel electrophoresis, and then the LrWRKY4 The fragments and the large fragments of the pCAMBIA2300S vector were gel-recovered separately, and 1 μL of the recovered product ...

Embodiment 3

[0028] Example 3: Plant genetic transformation mediated by Agrobacterium and screening of transgenic plants

[0029] The transgenic recipient in this experiment was tobacco ( Nicotiana tabacum ), the tobacco seeds were soaked in 75% alcohol for 30s, washed with sterile water and washed with 0.1% HgCl 2 Soak for 8 minutes, then wash several times with sterile water, sow on 1 / 2 MS medium, culture in dark at 28°C for 5-8d, transfer to light incubator after germination (25°C, 16h / d light), and then Subculture once a month with 1 / 2 MS medium.

[0030] Take out the stored pCAMBIA2300S-containing pCAMBIA2300S- LrWRKY4 Agrobacterium LBA4404 strain of the plasmid, inoculated 20 μL into 5 mL LB liquid medium containing 50 mg / L Km and 20 mg / L rifampin, and cultured at 28°C until the medium was turbid. Pipette 1 mL of turbid bacterial solution onto LB solid medium containing 50 mg / L Km, and incubate at 28°C for 48 h; then scrape off an appropriate amount of Agrobacterium on LB solid m...

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Abstract

The invention discloses a lilium regale WRKY transcription factor gene LrWRKY4. The nucleotide sequence of the lilium regale WRKY transcription factor gene LrWRKY4 is described as in the SEQ ID NO:1,and the coded protein of the lilium regale WRKY transcription factor gene LrWRKY4 corresponds to the amino acid sequence described in the SEQ ID NO:2. According to the lilium regale WRKY transcriptionfactor gene LrWRKY4, it is proved that the LrWRKY4 gene has the function of improving the antifungal ability of plants through the technical research related to the functional genomics, the antifungal LrWRKY4 gene is constructed to a plant expression vector and transferred into tobacco for overexpression, the transgenic tobacco has very high antifungal activity, and the experimental result showsthat the tobacco with the LrWRKY4 gene overexpressed is highly resistant to infestation of nigrospora oryzae, fusarium graminearum, fusarium graminearum, botryosphaeria and fusarium solanum.

Description

Technical field [0001] The invention relates to the research fields of molecular biology and genetic engineering related technologies, in particular to a Minjiang lily WRKY transcription factor gene LrWRKY4 and applications. Background technique [0002] Plants will be subject to a variety of abiotic or biotic stresses during their growth and development. Abiotic stresses include drought, waterlogging, salinity, lack of nutrients, low temperature, radiation, etc. Biological stresses include fungi, bacteria, viruses, nematodes or parasitism. Seed plants etc. Among biotic stresses, fungi cause the largest number of plant diseases, accounting for more than 70%, seriously harming plant growth and economic value. Fungi are tenacious and many pathogenic fungi can form special tissues or spores to overwinter and are harmful all year round. Fungi spread easily, mainly through airflow and water flow in fields; in addition, wind, rain, and insects can also spread fungal diseases. ...

Claims

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Application Information

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IPC IPC(8): C07K14/415C12N15/29C12N15/84A01H5/00A01H6/82
CPCC07K14/415C12N15/8282
Inventor 刘迪秋赵秦郑锂蕾陈虹均王自娥李珊葛锋
Owner KUNMING UNIV OF SCI & TECH
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