小麦MTP基因家族分析及其在胁迫下的作用
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湖北省教育厅科学研究计划重点项目(D20191305)


Bioinformatic Analysis of Wheat Metal Tolerance Protein (MTP) Gene Family and Its Role under Stress
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    摘要:

    金属耐性蛋白(metal tolerance protein,MTP)通过结合流入或流出胞质溶胶中的金属来维持植物体内的金属稳态。该研究通过多种生物信息学方法鉴定并分析小麦基因组TaMTP基因,并用qRTPCR技术分析TaMTP基因在多种重金属胁迫下的表达情况,为深入研究该家族基因对小麦生长发育的调控机理及其抗逆性提供理论依据。结果表明:(1)TaMTPs均具有阳离子外排家族结构域,大多数成员具有锌转运蛋白二聚结构域;系统发育和聚类分析显示,TaMTP蛋白主要分为G1、G5、G6、G7、G8、G9和G12七组;基因结构和基序分析表明,TaMTP基因多具有相对保守的外显子内含子排列和保守基序。(2)由RNASeq数据的基因表达谱分析发现,不同TaMTP基因都有其独特的表达机制,其中TaMTP11BbTaMTP11D在非生物胁迫下表达水平较高,TaMTP11ATaMTP11BbTaMTP11DTaMTP113AbTaMTP113BTaMTP113D在生物胁迫下有较高的表达量。(3)qRTPCR分析表明,当小麦遭受锌(Zn)、铜(Cu)、钴(Co)、镉(Cd)、锰(Mn)和铁(Fe)重金属胁迫时,TaMTP11ATaMTP84ATaMTP84DTaMTP113AaTaMTP113B共5个TaMTP基因的表达水平增加,表明每种金属离子均可诱导这些TaMTP基因在根和叶的表达,但TaMTP11ATaMTP84A在Fe3+与Cu2+胁迫下的表达情况完全相反,且在Fe3+胁迫下小麦叶和根组织中2个基因的表达量均很低,推测TaMTPs可能参与相应的微量元素的耐受或转运,但不同TaMTP对不同金属的转运功能存在差异。

    Abstract:

    Metal tolerant protein (MTP) maintains metal homeostasis in plants by absorbing and expelling metals from the cytoplasmic sol. In this study, we used a variety of bioinformatic methods to identify and analyze the TaMTP genes in the wheat genome, and qRTPCR to analyze the expression of TaMTP genes under the stress of various heavy metals, so as to provide theoretical basis for indepth study of the regulatory mechanism and stress resistance of this family of genes on the growth and development of wheat. The results showed that: (1) TaMTPs all had cationic Efferent family domain, and most members had zinc transporter dimeric domain. Phylogenetic and cluster analysis showed that TaMTP proteins were divided into seven groups: G1, G5, G6, G7, G8, G9 and G12. Analysis of gene structure and motif revealed that most TaMTP genes had relatively conservative exonintron arrangement and conserved motif composition. (2) Gene expression profile analysis of RNASEQ data showed that different TaMTP genes had their own unique expression mechanism, among which TaMTP11Bb and TaMTP11D had higher expression levels under abiotic stress, TaMTP11A, TaMTP11Bb, TaMTP11D, TaMTP113Ab, TaMTP113B and TaMTP113D had higher expression levels under biological stress. (3) qRTPCR analysis showed that when wheat was subjected to heavy metal stress of zinc (Zn), copper (Cu), cobalt (Co), cadmium (Cd), manganese (Mn) and iron (Fe), the expression levels of TaMTP11ATaMTP84ATaMTP84DTaMTP113Aa and TaMTP113B were increased. The results showed that each metal ion could induce the expression of these TaMTP genes in roots and leaves. However, the expressions of TaMTP11A and TaMTP84A under Fe3+ and Cu2+ stress were completely opposite, and the expression levels of the two genes in wheat leaves and root tissues were low under Fe3+ stress. It was speculated that TaMTPs might be involved in the tolerance or transport of corresponding trace elements, but different TaMTP had different transport functions for different metals.

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杨 蕾,卢 晨,朱永兴,等.小麦MTP基因家族分析及其在胁迫下的作用[J].西北植物学报,2020,40(7):1123-1134

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  • 在线发布日期: 2020-08-24
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