小麦TaDRLea32基因的克隆及胁迫诱导表达分析
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高等学校博士学科点专项科研基金(201202041100 33);


Cloning of a New Gene TaDRLea32 from Wheat and Its Expression under Different Stresses Treatments
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    摘要:

    胚胎发育后期丰富蛋白(late embryogenesis abundant protein,LEA蛋白) 是植物体中广泛存在的一类与渗透调节相关的家族蛋白,植物受非生物胁迫会大量表达。该研究采用同源克隆技术,从干旱诱导的小麦品种‘郑引1号’ (Triticum aestivum L.)中获得1个新的LEA3家族基因( TaDRLea32),该基因全长668 bp,编码区为570 bp,编码189个氨基酸。生物信息学分析表明该蛋白为亲水性蛋白,二级结构以α螺旋为主,含有9个由11个氨基酸组成的保守结构域,为典型的LEA3蛋白,存在3个磷酸化位点,无信号肽结构域及跨膜结构域,可能定位于细胞质中;实时定量PCR结果表明, TaDRLea32基因受干旱、高盐、低温诱导表达,同时也受外源ABA诱导,推测 TaDRLea32为ABA依赖型 LEA3基因,以不同机制参与小麦对非生物胁迫的应答过程,为深入分析小麦LEA3家族蛋白的抗逆机制奠定了基础。

    Abstract:

    Late embryogenesis abundant protein(LEA) are a suite of important family proteins found in organisms, which are generally involved in osmoregulation and are expressed abundantly when subjected to environmental stresses. In this study, we isolated a novel LEA3 gene TaDRLea32 from wheat‘Zhengyin No.1’. The full length of TaDRLea32 is 668 bp, whose ORF is 570 bp, encoding 189 amino acids, and consists of 9 conserved 11mer repeating motifs; Protein prediction shows that the protein is highly hydrophilic and located in the cytoplasm, with three phosphorylation sites and has no transmembrane domain or signal peptide; Secondary structure analysis shows that the main structure is alpha helix; Homology comparison and regenerating phylogenetic tree were carried out by MEGA5.1. Expression analyses revealed that TaDRLea32 gene was induced by drought, lowtemperature, highsalt stress and also moreover, can be induced by ABA treatment. These results suggested that TaDRLea32 is an ABAdependent LEA3 gene, participating in the response process of wheat under the abiotic stresses in different mechanisms and can lay a foundation for elucidating LEA3 gene protection mechanism under abiotic stresses in wheat.

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梁雅珺,于正阳,强智全,等.小麦TaDRLea32基因的克隆及胁迫诱导表达分析[J].西北植物学报,2016,36(6):1091-1097

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  • 在线发布日期: 2016-07-18
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