CN109456947A - A kind of method that efficient indoor winter saves propagation southern rice black-streaked dwarf virus - Google Patents

A kind of method that efficient indoor winter saves propagation southern rice black-streaked dwarf virus Download PDF

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CN109456947A
CN109456947A CN201811441017.5A CN201811441017A CN109456947A CN 109456947 A CN109456947 A CN 109456947A CN 201811441017 A CN201811441017 A CN 201811441017A CN 109456947 A CN109456947 A CN 109456947A
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srbsdv
rice
backed planthopper
white backed
dwarf virus
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李有志
胡奎
丁文兵
邱林
贺华良
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Hunan Agricultural University
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    • C12N7/00Viruses; Bacteriophages; Compositions thereof; Preparation or purification thereof
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    • C12NMICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N2720/00MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA dsRNA viruses
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    • C12N2720/12011Reoviridae

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Abstract

A kind of method that efficient indoor winter saves propagation southern rice black-streaked dwarf virus, it is the rice freezen protective that will infect southern rice black-streaked dwarf virus (SRBSDV), liquid nitrogen processing is lower will to freeze rice grind into powder, SRBSDV virion is extracted with phosphate buffer (pH 7.4) again, and the viral extract of extraction is injected into the internal of white backed planthopper, it can be obtained the white backed planthopper of the carrying southern rice black-streaked dwarf virus for passing poison.The white backed planthopper that infection southern rice black-streaked dwarf virus is obtained using this method, can solve the bottleneck that rice of catching an illness is difficult to long-term preservation (especially rice cannot survive under winter cryogenic conditions).The present invention can be also used for interaction of the research SRBSDV virus between the intracorporal infection mechanism of white backed planthopper, and virus and mediator white backed planthopper.

Description

A kind of method that efficient indoor winter saves propagation southern rice black-streaked dwarf virus
Technical field
The invention belongs to field of biotechnology, specifically, being a kind of efficient indoor winter preservation propagation south rice The method of black-streaked dwarf virus.
Background technique
Southern rice black-streaked dwarf virus (southern rice black-streaked dwarf virus, SRBSDV) Be the 2nd group of Reoviridae (Reoviridae) Fijivirus category (Fijivirus) a novel species (Zhou Guohui etc., 2008).White backed planthopper (Sogatella furcifera) is the unique propagation mediator of the virus, with persistently, walk around to proliferous type side Formula is propagated.SRBSDV is since, due to passing the activity of migrating of virus mediator white backed planthopper, fast propagation, to south China rice The Rice Production in area causes great loss.The virus also results in the Rice Production of Vietnam, Japan and South Korea serious It influences.2009 and 2010, the area that China's rice is infected by SRBSDV was up to 33.33 ten thousand hm2With 66.67 ten thousand hm2.Hereafter, by In actively taking disease prevention and control measure, the occurring area of the virus is controlled in 250,000 hm2Left and right.But according to Liu Wancai etc. (2016) it reports, from 2016, which had the trend that comes back again.
Since virus report, the researcher with regard to there are many is active in research disease-white backed planthopper-rice interaction pass System, effective prevention and control measure etc..According to the occurrence regularity of SRBSDV, " controlling worm diseases prevention " is to control effectively arranging for disease prevalence It applies.But by the white backed planthopper service life is short and rice of catching an illness be difficult to long-term preservation (especially under the cryogenic conditions in winter, rice It is easily withered) limitation, researchers generally require 4 annual~May is coastal in south China and the rice regions such as Hainan Province Field acquisition catch an illness rice, taking back laboratory qualification and expanding numerous rear can be used for further scientific research.Acquisition and identification dye This process of sick rice is complicated, time-consuming and laborious and expends financial resources, it is often more important that significantly limits laboratory research The progress of the virus.Some effort have also been made in terms of saving the virus indoors in researcher.CN102630640A discloses one kind Preparation method and its application for carrying the white backed planthopper of southern rice black-streaked dwarf virus, describe white backed planthopper in freeze-thaw The rice caught an illness on feeding, white backed planthopper can carry the virus.In fact, this method and unstable, Liu et al. (2016) card Bright white backed planthopper can obtain poison from the rice of defrosting, but virus can not cause this white in the internal duplication of white backed planthopper Backward flight lice will not propagate SRBSDV.And pass through electron microscope observation, Liu et al. discovery, the virion of SRBSDV after freezing Coat protein rupture, so that virion enteral in white backed planthopper loses protection and digested, or because of virus capsid protein Rupture cannot cannot break through the middle Gut barrie r of white backed planthopper by the Receptor recognition on midgut epithelial cell without can enter middle intestines.
So far, the method that indoor winter saves SRBSDV is still study the virus during urgent need to resolve ask Topic.
Summary of the invention
The technical problems to be solved by the present invention are: being directed to the deficiency of above-mentioned existing SRBSDV Techniques of preserving, one kind is provided Efficient interior winter saves the method for propagating southern rice black-streaked dwarf virus.
In order to solve the above technical problems, the technical scheme adopted by the invention is that: a kind of efficient indoor winter preservation biography The method for broadcasting southern rice black-streaked dwarf virus, the method steps are as follows:
A. the paddy rice low freezen protective of southern rice black-streaked dwarf virus will be infected;
B. the phosphate buffer for being 7.4 with pH value extracts to extract SRBSDV virion freezing rice, obtains SRBSDV extracting solution;
C. SRBSDV extracting solution is injected into the lymph not with the white backed planthopper of SRBSDV, obtains that taking for poison can be passed White backed planthopper with SRBSDV.
Cryogenic freezing storage temperature in the step A is -60~-100 DEG C.
SRBSDV extracting solution is after the rice liquid feeding nitrogen of freezing is pulverized in the step B, and it is 7.4 that pH value, which is added, Phosphate buffer, every gram of freezing rice add 800~2000 μ L phosphate buffers, mix, and in 4 DEG C of 0.5~3h of extraction, centrifugation is taken Supernatant obtains.
In the step C, the injection volume of SRBSDV extracting solution is that every white backed planthopper injects 20~150nL;For injecting White backed planthopper be 3~5 age nymphs and sprout wings 1~2d adult, injection position be chest of the white backed planthopper in addition to foot and wing.
Specifically, steps are as follows for operation of the present invention:
A. it the acquisition and preservation of contamination rice: from the rice sample of field acquisition suspected infection SRBSDV, is examined through RT-PCR After surveying identification, taking qualification result is the rice of SRBSDV infection, is placed in -60~-100 DEG C of freezen protectives;
B. the extraction to SRBSDV virion: using liquid nitrogen flash freezer grinding rice at powder, then the phosphoric acid for being 7.4 with pH value Buffer is in 4 DEG C of extraction 0.5~3h of Rice Powder to extract SRBSDV virion, and after high speed centrifugation, supernatant is SRBSDV extracting solution;
C. SRBSDV extracting solution is injected into the lymph not with the white backed planthopper of SRBSDV with microinjection instrument;
D. the white backed planthopper after injection SRBSDV is fed with the rice seedling of health, after 3~5d, is carried on the back with RT-PCR method dialogue The malicious situation of the band of plant hopper is checked that SRBSDV is expanded in white backed planthopper body;
E. the white backed planthopper of the injection of healthy rice seedlings feeding 5d SRBSDV is transferred on the rice of early tillering stage, into Row man power single stem rice passes poison test.The detection of rice band poison situation is carried out to rice leaf with RT-PCR method, white backed planthopper smoothly will SRBSDV is passed on rice;
F. nontoxic white backed planthopper is connected to detection in step E and detects the band of white backed planthopper after 7d on virulent rice Malicious situation, white backed planthopper smoothly can obtain poison from this rice.
The method that the present invention uses microinjection, by PBS (phosphate buffer, pH=7.4) from the infection SRBSDV of freezing The viral extract extracted in rice is injected directly into the lymph not with the white backed planthopper of SRBSDV, as a result SRBSDV energy Amplification is replicated in white backed planthopper body, and white backed planthopper can pass to the virus on healthy rice.Method provided by the invention Can the SRBSDV of freezing be gone in white backed planthopper body and be replicated, and white backed planthopper can pass to SRBSDV on rice, solve SRBSDV material subculture problem in winter room, researcher no longer need annual to acquire the rice of infection SRBSDV and white from field Backward flight lice.
In this way, virus is extracted the present invention provides the SRBSDV material of freezen protective is ground, then through PBS, finally with aobvious The method of microinjection by virus injection to the white backed planthopper body not with SRBSDV in, successfully make white backed planthopper with poison method. This method successfully solves the technical bottleneck that SRBSDV and subculture cannot be effectively saved in winter room, goes on smoothly section for researcher It learns research and provides the guarantee of experimental material.
Detailed description of the invention
Fig. 1 is the electrophoretogram of SRBSDV in the rice sample of RT-PCR detection field acquisition.
Wherein: M maker;1~4 is rice sample.
Fig. 2 is electrophoretogram of the white backed planthopper with malicious situation after RT-PCR detection injection SRBSDV extracting solution 5d.
Wherein: M maker;1~30 is the white backed planthopper sample that injection has SRBSDV virus.
Fig. 3 is that RT-PCR detection injection obtains the electrophoretogram that malicious white backed planthopper passes the rice band poison situation of poison.
Wherein: M maker;1~30 rice sample to be passed poison.
Fig. 4 is that RT-PCR white backed planthopper of the detection without SRBSDV is obtained from the malicious successfully rice of the malicious white backed planthopper biography of injection band The electrophoretogram of poison.
Wherein: M maker;1~30 is the white backed planthopper sample for obtaining poison.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
1. acquisition, identification and the preservation of field SRBSDV infection rice
From the rice sample of field acquisition suspected infection SRBSDV, using all pretty equal (2010, Zhou Qian, Zhu Junzi, Liang Jin Just, southern rice black-streaked dwarf virus is waited quickly to detect [J] genomics and applied biology, 2010,29 (5): 1009- 1012.) the SRBSDV in RT-PCR method detection rice.Specifically: referring to precious bioengineering (Dalian) Co., Ltd (TaKaRa) nucleic acid extraction kit specification (Code No.9767) extracts rice sample total serum IgE, then with the first of TaKaRa Chain cDNA synthetic agent box (Code No.6210) synthesizes cDNA.PCR reaction system: Ex Taq Version 2.0 (TaKaRa) 10 μ L, each 1 μ L of upstream and downstream primer (S10F/S10R), 1 μ L of cDNA template add ddH2O complements to reaction system final volume 20 μ L, PCR response procedures are as follows: 94 DEG C of 2min of initial denaturation are denaturalized 94 DEG C of 30s, and anneal 55 DEG C of 30s, 72 DEG C of extension 1min, circulation Amplification 30 times, last 72 DEG C of extensions 10min.It is expected that amplification purpose band is 477bp, 1.5% Ago-Gel of amplified production Electrophoresis is analyzed, as a result as shown in Figure 1, rice sample is SRBSDV infection.The rice for being accredited as the SRBSDV positive is encapsulated in Valve bag is placed in -80 DEG C of preservations.
2. the acquisition and raising of nontoxic white backed planthopper
Never the rice field that SRBSDV occurs collects white backed planthopper nymph, and the indoor non-nontoxic seedling of insect-proof rice is raised, Temperature is 25~30 DEG C, relative humidity 70% or so, photoperiod 14L:10D.It is more than indoor raising three generations.And survey sample, Ensure white backed planthopper without SRBSDV virus.
The preparation of 3.SRBSDV extracting solution
The rice 0.5g for taking cryogenic freezing adds liquid nitrogen grinding, and powder is transferred to the sterile centrifugation tube of 1.5mL, is added 800 μ L's PBS (phosphate buffer, pH=7.4) oscillation mixes, 1.5h (therebetween, mixing is rocked in not timing) under the conditions of centrifuge tube is placed in 4 DEG C, 12000rpm/min is centrifuged 10min, and supernatant is SRBSDV extracting solution.
4. SRBSDV is injected into white backed planthopper body by microinjection
Collect 4 age white backed planthopper nymphs of aforementioned indoor raising, CO21~2min is anaesthetized, microinjection instrument is used SRBSDV extracting solution is injected into white backed planthopper from the mesopodium and metapedes base portion of white backed planthopper by (Drummond Scientific) In lymph, volume injected is the every worm of 100nL/.White backed planthopper after injection is raised with the rice seedling for being uninfected by SRBSDV virus It supports.After 5d, RT-PCR method single head detects the malicious situation of white backed planthopper band.Detection method is the same as the field rice band poison in abovementioned steps 1 As a result detection is shown in that Fig. 2, display SRBSDV are expanded in white backed planthopper body.
5. white backed planthopper passes poison and obtains malicious test
The white backed planthopper with SRBSDV virus that injection is obtained, is transferred on the rice of early tillering stage with 10 heads/plant, is adopted Malicious method is connect with single plant, is repeated 30 times.White backed planthopper removes after feeding 3d on rice.Rice is placed in solarium's culture of no worm After 30d, the detection of rice band poison situation is carried out to rice leaf with RT-PCR method (the same), testing result is shown in Fig. 3, shows white backward flight Lice smoothly passes to SRBSDV on rice.The 3 age white backed planthoppers not with SRBSDV virus are transferred to above-mentioned detection band poison Rice on, after 7d using RT-PCR method (the same) single head detection white backed planthopper band poison situation, detect 30 cephalonts altogether, as a result see Fig. 4, white backed planthopper can smoothly obtain SRBSDV virus from this rice.

Claims (6)

1. a kind of efficient indoor winter saves the method for propagating southern rice black-streaked dwarf virus, which is characterized in that this method Steps are as follows:
A. the paddy rice low freezen protective of southern rice black-streaked dwarf virus will be infected;
B. the phosphate buffer for being 7.4 with pH value extracts to extract SRBSDV virion freezing rice, obtains SRBSDV Extracting solution;
C. SRBSDV extracting solution is injected into the lymph not with the white backed planthopper of SRBSDV, obtains the carrying that can pass poison The white backed planthopper of SRBSDV.
2. a kind of efficient indoor winter as described in claim 1 saves the method for propagating southern rice black-streaked dwarf virus, It is characterized in that, the cryogenic freezing storage temperature in the step A is -60~-100 DEG C.
3. a kind of efficient indoor winter as described in claim 1 saves the method for propagating southern rice black-streaked dwarf virus, It is characterized in that, SRBSDV extracting solution is that phosphoric acid buffer is added after the rice liquid feeding nitrogen of freezing is pulverized in the step B Liquid, 1g freezing rice add 800~2000 μ L phosphate buffers, mix, and in 4 DEG C of 0.5~3h of extraction, centrifugation takes supernatant, obtains It arrives.
4. a kind of efficient indoor winter as described in claim 1 saves the method for propagating southern rice black-streaked dwarf virus, It is characterized in that, the injection volume of SRBSDV extracting solution is the every worm of 20~150nL/ in the step C.
5. a kind of efficient indoor winter as described in claim 1 saves the method for propagating southern rice black-streaked dwarf virus, It is characterized in that, the white backed planthopper in the step C for injection is the adult of 3~5 age nymphs and the 1~2d that sprouts wings.
6. a kind of efficient indoor winter as described in claim 1 saves the method for propagating southern rice black-streaked dwarf virus, The injection position chosen when it is characterized in that, injecting white backed planthopper in the step C is chest of the white backed planthopper in addition to foot and wing.
CN201811441017.5A 2018-11-29 2018-11-29 A kind of method that efficient indoor winter saves propagation southern rice black-streaked dwarf virus Pending CN109456947A (en)

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