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植物抗病基因工程的研究进展及前景展望 总被引:9,自引:1,他引:9
近年来,随着植物抗病基因(尤其是抗病毒基因)的分离,植物抗病机制的分子生物学和植物抗病基因工程的研究轰轰烈烈地展开并取得重大突破。本文针对植物抗病基因工程的原理、抗病基因、转化方法等方面的进展进行了综述,并对抗病基因工程的应用前景做了展望。 相似文献
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作物抗病基因工程研究进展 总被引:1,自引:2,他引:1
控制植物病害的关键,取决于对植物与病原菌相互作用的分子机理的了解。将抗病基因、信号传导/调控基因、抗菌蛋白基因等导入拟改良的作物、选育抗病新品系,是当前作物抗病基因工程研究的主要策略。本文介绍利用植物抗病反应中系列重要基因进行作物抗病基因工程的研究进展,讨论了目前作物抗病基因工程中存在的问题及其解决的方法。 相似文献
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林木抗病基因工程研究的关键是建立高效的遗传转化体系和选择优良的抗病目的基因。本文就近年来林木抗病基因工程中有关遗传转化体系的建立及抗病目的基因的应用进行简要综述。 相似文献
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SGTl是多种植物抗病基因介导的抗病信号途径的必要组件。SGTl基因的突变或沉默会导致多种植物R基因介导抗病性的丧失。另外,SGTl还参与调控植物的非宿主抗性(non-host resistance)。SGTl主要作为分子伴侣或调控泛素化对植物抗病反应进行调控。本文综述了SGTl蛋白结构、SGTl在不同植物抗病反应中的重要性与作用机制,并对SGTl在植物抗病基因工程中的应用潜力进行讨论。 相似文献
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农作物抗病基因的研究对植物抗病机理和抗病基因工程都是很重要的,在理论上和应用前景上都引人兴趣。在抗病基因尚未分离和证实之前,人们对这方面的看法颇有分歧。如抗病性是由单基因或多基因决定的?它是组成型的或是诱导型的等等。在许多基因被分离并克隆出来的令天,为何农作物抗病基因迟迟未被分离出来,甚至连抗病基因的产物是什么也无所知。本文对这些问题作了简要的评述。 相似文献
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水稻条纹病毒引起的水稻条纹叶枯病在水稻种植区造成巨大的经济损失,有关病毒本身及抗病基因一直是近年研究的热点。根据近年的研究成果,综述在病毒的核酸、蛋白质、抗病基因及应用基因工程控制病害等方面的研究进展,并对利用抗病基因工程策略控制病害的应用前景进行了展望。 相似文献
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SGT1在植物抗病反应中的功能研究进展 总被引:1,自引:0,他引:1
SGT1是多种植物抗病基因介导的抗病信号途径的必要组件.SGT1基因的突变或沉默会导致多种植物R基因介导抗病性的丧失.另外,SGT1还参与调控植物的非宿主抗性(non-host resistance).SGT1主要作为分子伴侣或调控泛素化对植物抗病反应进行调控.本文综述了SGT1蛋白结构、SGT1在不同植物抗病反应中的重要性与作用机制,并对SGT1在植物抗病基因工程中的应用潜力进行讨论. 相似文献
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植物抗病基因克隆研究进展 总被引:1,自引:0,他引:1
随着分子生物学及其相关技术的飞速发展,人们对植物与病原微生物相互作用的分子机制了解得越来越透彻。本文对植物过敏性反应和系统获得抗性作了简要概述,并着重讨论了植物抗病基因克隆的进展,涉及到转座子标签技术、定位克隆技术、染色体步行、染色体登陆等方法和策略,归纳了克隆到的植物抗病基因及其产物结构,概述了这些基因产物所共有的特点,并简要介绍了植物抗病基因工程的进展。 相似文献
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基因捕捉及其在植物基因分离和功能基因组学上的应用 总被引:3,自引:0,他引:3
基因捕捉是一种报告基因的随机整合技术。基因捕捉系统已成为分离基因、鉴定基因功能的重要手段。基因捕捉(gene traps)包括增强子捕捉(enhancer trap)、启动子捕捉(promoter trap)和基因捕捉(gene trap),通称为基因捕捉(gcne traps)。在增强子捕捉中,报告基因与一个基本启动子融合,这个启动子不能使报告基因表达,但可被临近的增强子激活。在启动子捕捉和基因捕捉中,报告基因的启动子被去除,融合基因只有以正确的方向插入到转录单元内才能表达。对基因捕捉系统的结构特征、构建方法、应用范围、研究现状和应用前景等作了系统论述,并对有关问题进行了讨论。 相似文献
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Pinaceae show elevated rates of gene turnover that are robust to incomplete gene annotation
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Claudio Casola Tomasz E. Koralewski 《The Plant journal : for cell and molecular biology》2018,95(5):862-876
Gene duplications and gene losses are major determinants of genome evolution and phenotypic diversity. The frequency of gene turnover (gene gains and gene losses combined) is known to vary between organisms. Comparative genomic analyses of gene families can highlight such variation; however, estimates of gene turnover may be biased when using highly fragmented genome assemblies resulting in poor gene annotations. Here, we address potential biases introduced by gene annotation errors in estimates of gene turnover frequencies in a dataset including both well‐annotated angiosperm genomes and the incomplete gene sets of four Pinaceae, including two pine species, Norway spruce and Douglas‐fir. We show that Pinaceae experienced higher gene turnover rates than angiosperm lineages lacking recent whole‐genome duplications. This finding is robust to both known major issues in Pinaceae gene sets: missing gene models and erroneous annotation of pseudogenes. A separate analysis limited to the four Pinaceae gene sets pointed to an accelerated gene turnover rate in pines compared with Norway spruce and Douglas‐fir. Our results indicate that gene turnover significantly contributes to genome variation and possibly to speciation in Pinaceae, particularly in pines. Moreover, these findings indicate that reliable estimates of gene turnover frequencies can be discerned in incomplete and potentially inaccurate gene sets. Because gymnosperms are known to exhibit low overall substitution rates compared with angiosperms, our results suggest that the rate of single‐base pair mutations is uncoupled from the rate of large DNA duplications and deletions associated with gene turnover in Pinaceae. 相似文献
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Gene set analysis allows the inclusion of knowledge from established gene sets, such as gene pathways, and potentially improves the power of detecting differentially expressed genes. However, conventional methods of gene set analysis focus on gene marginal effects in a gene set, and ignore gene interactions which may contribute to complex human diseases. In this study, we propose a method of gene interaction enrichment analysis, which incorporates knowledge of predefined gene sets (e.g. gene pathways) to identify enriched gene interaction effects on a phenotype of interest. In our proposed method, we also discuss the reduction of irrelevant genes and the extraction of a core set of gene interactions for an identified gene set, which contribute to the statistical variation of a phenotype of interest. The utility of our method is demonstrated through analyses on two publicly available microarray datasets. The results show that our method can identify gene sets that show strong gene interaction enrichments. The enriched gene interactions identified by our method may provide clues to new gene regulation mechanisms related to the studied phenotypes. In summary, our method offers a powerful tool for researchers to exhaustively examine the large numbers of gene interactions associated with complex human diseases, and can be a useful complement to classical gene set analyses which only considers single genes in a gene set. 相似文献
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利用套叠PCR技术进行基因突变和拼接 总被引:11,自引:4,他引:11
利用套叠PCR技术(又称重叠区扩增基因拼接法)对hGM-CSF基因内第28位氨基酸处的糖基化位点进行突变和进行人促性腺激素基因,腺苷酸激酶短肽与胰岛素样生长因子-基因三者之间的拼接,结果表明采用该技术能在体外实行有效的基因重组和定点突变,其成功率为100%,这一技术不需要内切酶消化和连接酶处理,技术操作员简单易行,在基因拼接,基因内部突变方面具有良好的应用价值。 相似文献
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Organization of the bacteriophage P1 tail-fibre operon 总被引:9,自引:0,他引:9
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Dietrich MR 《Comptes rendus de l'Académie des sciences. Série III, Sciences de la vie》2000,323(12):1139-1146
During the early 20th century the diverse practices of genetics were unified by the concept of the gene. This classical gene was simultaneously a unit of structure, function, mutation, and recombination. Starting in the 1940s, however, the classical gene began to fragment. Today when we speak of a gene for some malady, a regulatory gene, a structural gene, or a gene frequency, it is entirely possible that we are deploying different gene concepts even though we are using the same term. The problem of the gene addresses the fragmentation of the classical gene concept by asking to what extent a comprehensive and unifying gene concept is possible or desirable. Fully comprehensive gene concepts seem untenable today, but, within different disciplinary domains, unifying, but non-comprehensive, gene concepts can be epistemically worthwhile. The problem of the gene persists, however, not because of its epistemic value, but because of its political value. Using both the arguments for newly proposed gene concepts and the historical dispute over the classical gene, I argue that the desirability of gene concepts rests in part on the political ramifications of their deployment and contestation. 相似文献