共查询到20条相似文献,搜索用时 734 毫秒
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全国粮食生产先进市、县(区)衡阳市、岳阳市,赫山区、衡阳县、桃源县、沅江市、醴陵市、望城区、岳阳县、安仁县、湘阴县、祁东县、双峰县、衡南县、汨罗县、耒阳市、宜章县、湘乡市、华容县、湘潭县、邵东县、道县。全国粮食生产先进工作者许靖波、吴振文、朱克服、钟武云、戴渐红、杨厚波、王峰、陈安柏、黎作风、熊春来、龙国文。全国种粮大户陈文敏(衡阳县)、刘啸(澧 相似文献
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一、安徽亳州市政府药材生产办公室所属的中药种植技术推广中心,现有药材种苗繁殖基地200多公顷,常年提供板蓝根、桔梗、薏米、牡丹皮、白术、白芷、菊花、北沙参、黄芩、黄芪、怀牛膝、生地、山药、防风、天南星、党参、百合、丹参、玄参、大黄等60多个品种的种子种苗.该中心地址:安徽亳州市药都大厦508室,邮政编码:236800. 相似文献
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目前,微量元素对农作物具有增产增收作用,已被农业科技界所证实.氨基酸微肥的使用范围很广,从粮食作物(水稻、小麦、玉米)到油料作物(油菜、大豆、花生),以及经济作物(棉花、茶叶、烟叶、桑叶)、水果(苹果、梨、柑桔、荔枝、龙眼、桃、李、杏、葡萄)、蔬菜(黄瓜、青菜、扁豆)等,几乎对所有的农作物都有不同程度的促进作用. 相似文献
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RNA干涉原理及其应用 总被引:5,自引:0,他引:5
RNA干涉是指外源dsRNA引发生物体内的基因的同源序列降解,从而表现出的基因转录后的沉默现象,它与植物中的共抑制和真菌中的基因压制可能具有相同的作用机制。在这一过程中,需要eIF2c类似蛋白因子、RNA螺旋酶、RNA依赖性RNA多聚酶、核糖核酸酶、ATP和转膜蛋白参与。RNA干涉可以用于功能基因组学研究,也可用于克服转基因生物的基因沉默现象,使外源基因在遗传改良生物中能更好地表达,还用于基因治疗,抑制有害基因的表达等。 相似文献
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RNA干扰(RNA interference,RNAi)是由双链RNA分子在mRNA水平关闭相应序列基因表达或使其沉默的过程。RNA干扰技术作为新兴的基因阻断技术具有明显优势,已经广泛地被应用于基因功能研究、抗肿瘤和抗病毒等热门领域。 相似文献
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Increasingly complex networks of small RNAs act through RNA-interference (RNAi) pathways to regulate gene expression, to mediate antiviral responses, to organize chromosomal domains, and to restrain the spread of selfish genetic elements. Historically, RNAi has been defined as a response to double-stranded RNA. However, some small RNA species may not arise from double-stranded RNA precursors. Yet, like microRNAs and small interfering RNAs, such species guide Argonaute proteins to silencing targets through complementary base-pairing. Silencing can be achieved by corecruitment of accessory factors or through the activity of Argonaute itself, which often has endonucleolytic activity. As a specific and adaptive regulatory system, RNAi is used throughout eukarya, which indicates a long evolutionary history. A likely function of RNAi throughout that history is to protect the genome from both pathogenic and parasitic invaders. 相似文献
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RNA interference in Colorado potato beetle(Leptinotarsa decemlineata): A potential strategy for pest control
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Colorado potato beetle(CPB), Leptinotarsa decemlineata, is a notorious destructive pest that mainly feeds on the leaves of potato and several other solanaceous plants. CPB is widely recognized for its adaptation to a remarkable variety of host plants and diverse climates, and its high resistance to insecticides and Bacillus thuringiensis toxins. RNA interference(RNAi) is a sequence-specific, endogenous gene silencing mechanism evoked by small RNA molecules that is used as a robust tool for virus and pest control. RNAi has been extensively tested for CPB management by employing various target genes and delivery methods. This article reviews the screening of RNAi target genes, efficient RNAi delivery systems, and factors affecting RNAi efficiency in CPB, which may help understand the mechanisms of RNAi and its application in CPB control strategy. 相似文献
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随着水稻全基因组测序的完成,探究水稻中许多未知基因的功能成了当前的研究重点之一。RNA干扰技术(RNAi)作为新发展起来的基因功能研究方法正在被广泛采用。以农杆菌介导转化水稻技术也逐渐成熟。简要综述了RNAi作用机制及其在水稻基因功能研究中的应用的最新进展。 相似文献
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双链RNA激发的植物基因沉默及其在植物育种上的应用 总被引:1,自引:0,他引:1
在生物体内,存在大量的非编码RNA(ncRNA),小干扰RNA(siRNA)是其中一种,由双链RNA切割形成,能干扰基因表达,激发转录后的基因沉默。尽管双链RNA干扰是把基因"敲低"而不是"敲除",但它的高效和易操作性使之成为研究植物基因功能的有用工具,并通过转基因途径用于植物改良。与反义RNA技术和共抑制技术相比,RNA干扰对基因的沉默效率高,效果稳定。单基因RNA干扰就可调控多基因家族控制的农艺性状,而不必累积单基因突变。把病毒基因构建成反向重复结构转入植物体内,其转录出的RNA会通过分子内序列互补形成双链结构,激发转基因植物的RNA干扰机制,将入侵病毒的同源序列降解,使转基因植株获得对病毒的抗性。RNA干扰型抗病毒转基因植株中,转病毒基因的mRNA不存在或存在量很少,也不会翻译成有功能的病毒蛋白质,因此不存在病毒RNA重组、异源包装及协生作用的潜在生物风险,具有较高的生物安全性。 相似文献
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The RNA interference (RNAi) pathway is found in most eukaryotic lineages but curiously is absent in others, including that of Saccharomyces cerevisiae. We show that reconstituting RNAi in S. cerevisiae causes loss of a beneficial double-stranded RNA virus known as killer virus. Incompatibility between RNAi and killer viruses extends to other fungal species in that RNAi is absent in all species known to possess double-stranded RNA killer viruses, whereas killer viruses are absent in closely related species that retained RNAi. Thus, the advantage imparted by acquiring and retaining killer viruses explains the persistence of RNAi-deficient species during fungal evolution. 相似文献