水稻HSP90基因家族功能研究
发布时间:2018-02-04 04:39
本文关键词: 水稻 HSP90 基因家族 表达 逆境 出处:《四川农业大学》2016年博士论文 论文类型:学位论文
【摘要】:随着近年来极端天气的出现愈加频繁,高温、低温、干旱及土壤盐渍化等逆境胁迫对作物的生长、发育、产量的影响也越发凸显。研究作物耐逆机制,培育耐逆品种成为当前亟待解决的问题。HSP90家族蛋白是一类丰富的分子伴侣蛋白,并广泛存在于真核生物中的保守蛋白。HSP90家族蛋白的主要功能主要是协助其它蛋白的正确折叠,并在逆境应答网络中发挥重要作用。本实验中利用生物信息学的工具,发现并分析了日本晴中HSP90家族的9个OsHSP90蛋白(OsHSP90-1至OsHSP90-9).通过序列比对,我们在水稻HSP90家族蛋白中确定了三个基序。通过进化树分析,将水稻HSP90家族蛋白分为三簇(Ⅰ,Ⅱ,Ⅲ)。本实验在水稻10个组织中对这9个OsHSP90蛋白基因进行了表达量分析。结果表明在10个部位的组织中OsHSP90-4、OsHSP90-6和OsHSP90-7有较高的表达水平,而OsHSP90-5和OsHSP90-8的表达水平非常低。OsHSP90-1只特异性的在开花14天后的胚中表达。据文献报道,在热激和其它逆境胁迫下,热激蛋白的表达会受到正向调控。但在本研究中,不同逆境胁迫条件下,水稻OsHSP90家族蛋白的表达模式却是各式各样的。在干旱、高盐、低温、热激胁迫下OsHSP90-2和OsHSP90-4的表达受到了正向调控,在高盐、干旱的胁迫下OsHSP90-3和OsHSP90-5的表达受到了负向调控。在干旱胁迫下OsHSP90-7和OsHSP90-9受到负向调控。与对照相比,在多种逆境胁迫下OsHSP90-6的表达量基本保持不变。我们分别用OsHSP90-2和OsHSP90-4转化大肠杆菌,均能提高转化菌株的细胞活性并提高对高温、高盐、干旱逆境环境的耐受力。我们分别用OsHsP90-2和OSHsP90-4转化水稻,但只有OsHSP90-4的水稻转化子对高温的耐受力有明显提高并增强水稻转化子对ABA的敏感性。这些结果为进一步研究水稻OsHSP90基因家族提供了新的视角。
[Abstract]:With the increasing occurrence of extreme weather in recent years, high temperature, low temperature, drought and soil salinization and other stresses on crop growth, development, yield has become more and more prominent. Breeding of stress tolerance varieties has become a problem to be solved. HSP90 family protein is a kind of abundant molecular chaperone protein. The main function of the conserved protein. HSP90 family, which is widely present in eukaryotes, is to assist in the correct folding of other proteins. And play an important role in adversity response network. In this experiment, bioinformatics tools are used. Nine OsHSP90 proteins from the HSP90 family in Nippon were found and analyzed by sequence alignment from OsHSP90-1 to OsHSP90-9. We identified three motifs in rice HSP90 family proteins. By phylogenetic tree analysis, rice HSP90 family proteins were divided into three clusters (鈪,
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