小麦黄矮病防治关键技术及其新型病毒抑制剂的研究
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摘要
小麦黄矮病(Wheat yellow dwarf)是我国重要的植物病毒病之一,由麦蚜传播大麦黄矮病毒(Barley yellow dwarf virus,BYDV)引起,导致小麦严重减产。为防治小麦黄矮病,选育抗BYDV品种是最经济有效的方法,但栽培品种中抗BYDV基因贫乏,常规育种周期长、定向性差、易带入不良性状;化学防治也是控制小麦黄矮病的主要途径之一,但主要以杀虫剂控制蚜虫为主,而且麦蚜难以准确预报。
     RNA干扰(RNA interference, RNAi)是将与内源性mRNA编码区序列同源的双链RNA导入细胞后,该mRNA发生特异性降解,从而导致该基因表达沉默的现象。小干扰RNA(small interfering RNA, siRNA)作为RNAi途径的重要中介,能够高效抑制病毒复制;阻断相应的病毒粘附受体的表达,切断病毒侵染途径;而且小干扰RNA介导的抗病毒效应具有高度特异性,对非同源基因的表达没有影响,已被广泛应用于哺乳动物和人细胞体系中基因功能和抗病毒研究。
     为防治小麦黄矮病及制备新型病毒抑制剂,本试验进行了如下研究:
     1.采用病毒抑制剂和杀虫剂相结合的方式进行了小麦黄矮病的田间药效试验。在小麦起身期,将大麦黄矮病毒GAV株系接种于陕恳9740上,喷施杀虫剂(2000倍液2.5%吡虫啉可湿性粉剂)与病毒抑制剂(500倍液20%病毒A可湿性粉剂、500倍液3.95%病毒必克可湿性粉剂、500倍液5%菌毒清水剂和300倍液2%菌克毒克水剂)组合后,于小麦开花期,统计发病率、病情指数和小麦叶片黄化率,结果表明,各组合均能早期预防和防治小麦黄矮病发生和发展,且预防效果优于防治效果,其中病毒必克与吡虫啉组合的平均预防和防治效果较显著,分别为58.08%和53.03%;
     2.初步研究了病毒必克对BYDV的作用机制。利用500倍液3.95%病毒必克可湿性粉剂,在室内进行的防治性试验,选用分析纯丙酮和分析纯乙醇混合液(2:1)浸泡提取叶绿素,测量叶绿素后发现,病毒必克可有效抑制GAV对叶绿素的破坏,可减轻大麦黄矮病毒对小麦的为害。
     3.初步制备了靶向BYDV-GAV株系依赖RNA的RNA聚合酶(RNA-dependent RNA polymerase, RdRp)和外壳蛋白(Coat protein, CP)的生物制剂。依据BYDV-GAV基因组全序列,设计并合成了siRNA的寡核苷酸序列,与含有转移DNA(Transferred-DNA, T-DNA)整合必需序列、卡那霉素抗性选择标记基因(nptⅡ)和35S启动子的双元表达载体pBI121连接,构建了重组表达载体pBI/siRNA,转至大肠杆菌鉴定繁殖后,再转至根癌农杆菌中,经电泳鉴定,质粒pBI/siRNA已转到根癌农杆菌中,表明得到了可能对BYDV-GAV有干扰作用的菌株。再将该菌株28℃在LB培养基上(含50μg/ml卡那霉素)过夜培养后,所得菌丝配置后,制成了可能对BYDV-GAV有干扰作用的生物制剂。
     采用病毒抑制剂和杀虫剂相结合的施药方式,有望广泛应用于由昆虫介体传播的植物病毒病的防治中;利用DNA重组技术,能获得对病毒有抑制作用的改良微生物,通过液体或固体发酵,可进行规模化生产,有助于植物病毒病的防治。
Wheat yellow dwarf is induced by barley yellow dwarf viruses (BYDV) that are vectored by aphids, is one of the most serious viral diseases. Control methods against wheat yellow dwarf are mainly based on resistant or tolerant cultivars and vector control (insecticide treatments) in China, however, the former is more economical and environmentally desirable, but the resistant gene to BYDV is scarce in wheat, and conventional breeding has the limitation of long cycle, undesirable directional selection, and is easy to bring undesirable agronomic traitsa. the latter option is more effective method,but it is difficult to forecast accurately the occurrence of aphid..
     RNA interference (RNAi) is a phenomenon in which double-strand RNA (dsRNA) specifically suppresses the expression of target protein by degrading the target mRNA. Small interference RNA (siRNA), an intermediated of the RNA-interference pathway, is effective in suppression of gene expression and virus infection in animal systems and human cells. Because siRNA can inhibit virus from replication efficiently, block to express of corresponding viral adhesion receptor so as to cut transmission route of virus, and siRNA-mediate resistance to virus exerted high specificity, and can’t influence on expression of non-homologous gene.
     In order to attempt to control wheat yellow dwarf with agrichemicals, and develop a new plant virus inhibitors, following trails were conducted in this paper.
     1. the efficacy trial was conducted in the field in the manner of combination between pesticide and plant virus inhibitors, including sowing wheat varieties Shanken 9740 on the field plot last year, inoculating strain GAV of barley yellow dwarf virus(BYDV) with Schizaphis graminum at wheat setting stage, praying agrochemicals combination between pesticide 2.5% imidacloprid wettable power at a dilution of 2000 and plant virus inhibitors (20% Virus A wettable power at a dilution of 500, 3.95% Bilken virucide wettable power at a dilution of 500, 5% Junduqing aqueous solution at a dilution of 500 and 2% Ningnanmycin aqueous solution at a dilution of 300) three times, investigating incidence and disease index of wheat yellow dwarf as well as the number of yellowing leaf at flowering stage, the results showed that all combinations have preventive and control effect on accidence and development of wheat yellow dwarf, and the preventive effect is superior to the control effect. Among the above combinations, the combination of Bilken viruaside and imidacloprid was most significant, and the average preventive and control effect were 58.08% and 53.03%,respectively.
     2. The influence of Bilken viruaside on inhibition of BYDV from the harm of chlorophyll was researched under Indoor condition. Chlorophyll in wheat leaves,extracted by mixed soak with analytically pure acetone and analytically pure ethanol(2:1),can be measured in test which wheat yellow dwarf was controlled by 3.95% Bilken virucide wettable power at a dilution of 500 in laboratory, the result indicated that Bilken viruaside can inhibit BYDV from the harm of chlorophyll so as to relieve the damage.
     3. A new plant virus inhibitors contained small interfering RNA aimed to RNA-dependent RNA polymerase and coat protein of BYDV-GAV was prepared on laboratory platform. In order to prove interference of the homologous siRNA with BYDV-GAV, oligonucleotides expressed siRNA were designed and synthesized according to the target protein gene of RNA-dependent RNA polymerase and coat protein of BYDV-GAV and sub cloned to the binary vector pBI121 which T-DNA contained the Gus reporter gene controlled by 35S promoter and nptII selectable marker gene controlled by the nopaline synthase (NOS) promoter, Then, these construction of expression vector pBI121/siRNA were introduced into A.tumefaciens strain EHA105 by freeze-thaw method. After electrophoretic analysis, vector pBI121/siRNA was confirmed to introduce into A.tumefaciens, Then,A.tumefaciens strain introduced expression vector pBI121/siRNA was incubated into LB medium contained 50μg/ml kanamycin, after overnight culture at 28℃,mycelium were developed into inhibitor by adding adjuvant.
     In the future, the control method in the manner of combination between pesticide and plant virus inhibitors will be applied extensively to plant virus disease transmitted by vector. Antagonistic microorganisms can be gained by genetic engineering, and suit to the large scale production by liquid fermentation so as to contribute to control of the plant virus disease.
引文
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