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Gene silencing technique based Laodelphax striatellus lethal gene fragment Tubulin and dsRNA thereof

A gene fragment and technology of SBPH, applied in the field of agricultural biology, can solve problems such as environmental pollution and poor control effect of chemicals, and achieve the effects of convenient experimental operation, reduced mechanical damage, and low synthesis cost

Inactive Publication Date: 2011-10-19
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In my country, the continuous single long-term use of chemical agents has led to varying degrees of resistance of the planthopper to various pesticides. It is necessary to continuously increase the amount of pesticides used to achieve satisfactory control effects, resulting in more serious environmental pollution. vicious circle
In addition, rice stripe leaf blight caused by stripe virus transmitted by SBPH is poorly controlled by pesticides after the onset, and can only be controlled by pest control

Method used

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  • Gene silencing technique based Laodelphax striatellus lethal gene fragment Tubulin and dsRNA thereof
  • Gene silencing technique based Laodelphax striatellus lethal gene fragment Tubulin and dsRNA thereof
  • Gene silencing technique based Laodelphax striatellus lethal gene fragment Tubulin and dsRNA thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Cloning method of Tubulin gene fragment:

[0039] (1) Get 10-20 heads of SBPH, and use the TRIzol method to extract total RNA;

[0040] (2) Synthesizing the first strand of cDNA;

[0041] (3) Obtain the gene fragment sequence from the SBPH transcriptome, and after homology comparison at http: / / www.ncbi.nlm.nih.gov / , it is predicted to be the SBPH Tubulin gene, using Primer premier 5.0 Software design P 1 and P 2, amplified by RT-PCR method;

[0042] Upstream primer (P1): 5'GCGACTTGTGAACCTG 3' (SEQ ID NO.2),

[0043] Downstream primer (P2): 5'TCTGCTGACGCTGAAA 3' (SEQ ID NO.3);

[0044] The PCR reaction program was: denaturation at 94°C for 2 min, 30 sec at 94°C, 30 sec at 55°C, 30 sec at 72°C, 35 cycles, and extension at 72°C.

[0045] PCR reaction system (50μL):

[0046]

[0047]

[0048] (4) The PCR product is separated by agarose gel electrophoresis, and the target DNA fragment is recovered;

[0049] (5) Insert the recovered target fragment into the pEA...

Embodiment 2

[0053] Embodiment 2.dsRNA synthesis and recovery

[0054] (1) According to the verified Tubulin gene fragment sequence, use Primer Premier 5.0 software to design P3 and P4.

[0055] The T7 promoter sequence TAATACGACTCACTATAGGG was added to the 5' end of the downstream primer;

[0056] Upstream primer (P4): 5' TAATACGACTCACTATAGGGGCGACTTGTGAACCTG 3' (SEQ ID NO.5)

[0057] Upstream primer (P5): 5' TAATACGACTCACTATAGGGTCTGCTGACGCTGAAA 3' (SEQ ID NO.6)

[0058]

[0059] PCR reaction program: denaturation at 94°C for 2min, 30sec at 94°C, 30sec at 60°C, 30sec at 72°C, 38 cycles, extension at 72°C.

[0060] (2) The PCR product was separated by electrophoresis on a low-melting point agarose gel with a concentration of 1% and observed under ultraviolet light. The results are shown in figure 1 , whose sequence is shown in SEQ ID NO.4.

[0061] (3) Using Promega's SV Gel and PCR Clean-Up System kit for recovery:

[0062] ① Cut the gel of the separated target fragment, put it i...

Embodiment 3

[0072] Embodiment 3.dsRNA feeding experiment

[0073] (1) Seal one end of the glass tube with a parafilm, suck the second-instar SBPH into the glass tube with a sucker, and seal the other end with gauze;

[0074] (2) Gently pat the insects to one end with your hands, remove the gauze from the other end, and put the prepared parafilm sticker face up, pull evenly to both sides, pull it into a square, and then cover it on the glass On the nozzle of the tube, place the tube upright on the ultra-clean table;

[0075] (3) Draw 100 μl of feed with a pipette gun and drop it in the center of the sealing film, the control only adds feed (see Table 2 for formula), the treatment group adds dsRNA of Tubulin gene (see Table 1 for concentration) in feed, and seals with a new Film, with the side of the sticker facing down, is pasted on the nozzle of the glass tube, and the feed and dsRNA are sealed between two layers of parafilm;

[0076] (4) Put the glass tube with feed and dsRNA back on t...

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Abstract

The invention belongs to the field of agricultural and biological technology and relates to a Laodelphax striatellus lethal gene fragment thereof. The invention is to screen the Laodelphax striatellus lethal gene fragment Tubulin, which can lead to the death of Laodelphax striatellus after interference and has a sequence represented by SEQ ID No.1, from Laodelphax striatellus by using a laboratory improved dsRNA feeding method. When the dsRNA of the gene fragment is used for feeding Laodelphax striatellus, the maximum adjusted mortality of the Laodelphax striatellus may reach 67.4 percent, and a sequence basis and a data basis are provided for the construction of a new policy of controlling pests by using RNA interference technology.

Description

technical field [0001] The invention belongs to the field of agricultural biotechnology, and relates to the lethal gene fragment Tubulin and dsRNA thereof based on gene silencing technology. Background technique [0002] In my country, the continuous single long-term use of chemical agents has led to varying degrees of resistance of the planthopper to various pesticides. It is necessary to continuously increase the amount of pesticides used to achieve satisfactory control effects, resulting in more serious environmental pollution. vicious circle. In addition, the rice stripe leaf blight caused by the stripe virus transmitted by the striatellus striatellus is poorly controlled by pesticides after the onset, so we can only rely on pest control to prevent disease. Therefore, in the practice of agricultural production, there is an urgent need for alternative control methods other than chemical pesticides. [0003] RNA interference (RNA interference, RNAi) is a gene silencing ph...

Claims

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Application Information

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IPC IPC(8): C12N15/12C12N15/113C12N15/10A01K67/033
Inventor 李飞李国清董双林韩召军姜卫华
Owner NANJING AGRICULTURAL UNIVERSITY
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