共查询到20条相似文献,搜索用时 93 毫秒
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分别调查了不采取防治措施田块和采取一定防治措施田块的发病率,详细讨论了在新的栽培条件下水稻条纹叶枯病的综合防治技术。本省水稻条纹叶枯病的防治关键时期为秧田期。应采取以农业防治为基础、以治虫防病为中心的综合防治措施,同时药剂防治灰飞虱,选用抗耐病品种,并通过一定的农业生产措施,达到减轻水稻条纹叶枯病发生重的目的。 相似文献
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由于耕作、栽培、气候等条件的变化,传毒灰飞虱的数量与日俱增,加之感病品种面积大,导致水稻条纹叶枯病近几年发生危害逐年加重。研究发现:应用综防措施,实施治虫控病战略,争得防病的主动权,能有效减轻水稻条纹叶枯病的危害。 相似文献
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水稻条纹叶枯病主要是由灰飞虱传播的一种病毒病。具有暴发性和流行性。我国南北稻区16个省市均有发生,2004年、2005年在江苏、安徽、河南等省大发生,有些地区病田率80%,病穴率达70%,病株率达40%以上,给水稻生产带来巨大损失。 相似文献
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近几年水稻条纹叶枯病(Rice stripe virus简称RSV)自然发生程度严重,通过实施综合防治措施,病害得到了有效控制.而2010年在局部又出现重发,上海市发生面积约12 093.33 hm2,平均病株率0.66%,严重田块病株率达20%以上.主要因素是灰飞虱发生量大、带毒率高、麦田和绿肥田混茬种植、一代灰飞虱成虫迁移峰期与水稻苗期吻合期长等.根据发生因素分析,提出了麦收后及时耕翻和灌水、适当推迟播期、避开稻麦共生等综防措施. 相似文献
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[目的]明确离体条件下水稻条纹病毒(RSV)外壳蛋白(CP)能否进入叶绿体,为研究RSV的致病机理提供依据和方法.[方法]参考有关文献的方法提取获得水稻和小麦叶绿体,在离体条件下进行RSV-CP的叶绿体跨膜运输试验,同时研究孵育时间、病毒浓度等对RSV-CP在水稻叶绿体中离体跨膜运输的影响.[结果]在离体条件下5min,RSV-CP即可进入RSV寄主植物水稻、小麦的叶绿体内,其离体跨膜运输的基本条件为RSV浓度58.1 μg/mL、孵育时间15 min.随着孵育时间的延长,进入叶绿体中的CP量有所增加;反应体系中RSV浓度加大,进入叶绿体中的RSV-CP量随之增加.[结论]离体条件下RSV-CP可进入寄主植物水稻、小麦的叶绿体中,病毒外壳蛋白进入叶绿体可能是其诱发花叶症状的主要原因之一. 相似文献
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水稻条纹叶枯病成灾原因初探 总被引:3,自引:0,他引:3
张家兴 《西北农林科技大学学报(自然科学版)》2005,33(Z1):65-67
针对水稻条纹叶枯病在江淮地区大发生及其治理中存在的问题,分析了该病的为害特点和影响因素,提出了一些措施与建议。 相似文献
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《农业科学学报》2016,(11)
Rice stripe virus(RSV) often causes severe rice yield loss in temperate regions of East Asia. Although the correlation of small interfering RNAs(si RNAs) with transgenic virus resistance of plants using RNA interference(RNAi) is known for decades, no systematical research has been done on the profiling of si RNAs from a genomic scale. Our research is aiming to systematically study the RNAi impact in RSV-resistant transgenic rice, which was generated by introducing an inverted repeat construct that targets RSV nucleocapsid protein(NCP) gene. In this paper, three independent RSV-retsistant transgenic rice lines were generated, their stable integration of the T-DNA fragment and the expression of si RNAs were confirmed by Southern blotting and Northern blotting analyses, and the majority of si RNAs were in lengths of 21, 22, and 24 nucleotides(nt), which have validated a connection between the presence of the RSV NCP homologous si RNAs and the RSV resistance in those transgenic rice lines. In one of these transgenic lines(T4-B1), the T-DNA fragment was found to have been inserted at chromosome 1 of the rice genome, substituting the rice genome fragment from 32 158 773 to 32 158 787 nt. Bioinformatics analysis of small RNA-Seq data on the T4-B1 line also confirmed the large population of NCP-derived si RNAs in transgenic plants, and the RSV-infected library(T4-B1-V) possessed more si RNAs than its mock inoculated libraries(T4-B1-VF), these results indicating the inverted repeat construct and RSV could introduce abundance of si RNAs in transgenic rice. Moreover, a varied expression level of specific si RNAs was found among different segments of the NCP gene template, about 47% of NCP-derived si RNAs reads aligned with the fragment from 594 to 832 nt(239 nt in length) in NCP gene(969 nt in length) in the T4-B1-V, indicating a potential usage of hotspot regions for RNAi silencing in future research. In conclusion, as the first study to address the si RNA profile in RSV-resistant transgenic plant using next generation sequencing(NGS) technique, we confirmed that the massive abundance of si RNA derived from the inverted repeat of NCP is the major reason for RSV-resistance. 相似文献
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小麦条锈病的发病规律与综合防治技术 总被引:3,自引:0,他引:3
小麦条锈病是小麦种植区的主要病害.我国的华北、西北、淮北等北方冬麦区为多发区和重发区,大流行年份往往造成大幅度减产,甚至绝收.特别近年来新的生理小种产生和发展,使现有生产用种抗性丧失,小麦生产处于条锈病的潜在威胁之中.因此深入了解该病的发病规律与综合防治技术具有十分重要的意义. 相似文献