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作物学报 ›› 2015, Vol. 41 ›› Issue (11): 1682-1691.doi: 10.3724/SP.J.1006.2015.01682

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

过表达谷子液泡H+-ATPase E亚基基因在拟南芥中的耐盐性

冯露1,2,钟理2,3,陈丹丹4,马有志2,徐兆师2,李连城2,周永斌2,陈明2,*,张小红1,   

  1. 1 西北农林科技大学生命科学学院, 陕西杨凌 712100; 2 中国农业科学院作物科学研究所 / 农作物基因资源与基因改良国家重大科学工程 / 农业部麦类生物学与遗传育种重点实验室, 北京 100081; 3 贵州省草业研究所, 贵州贵阳 550006; 4 西北农林科技大学农学院, 陕西杨凌 712100
  • 收稿日期:2015-02-11 修回日期:2015-06-01 出版日期:2015-11-12 网络出版日期:2015-06-29
  • 基金资助:

    本研究是由北京市科技计划项目(Z141100002314018), 国家转基因生物新品种培育重大专项(2014ZX08002-003B)和陕西省科技攻关项目(2014K02-04-05)资助。

Overexpression of Vacuole H+-ATPase E Subunit Gene SiVHA-E from Foxtail Millet Enhances Salt Resistance in Transgenic Arabidopsis thaliana

FENG Lu1,2,ZHONG Li2,3,CHEN Dan-Dan4,MA You-Zhi2,XU Zhao-Shi2,LI Lian-Cheng2,ZHOU Yong-Bin2,CHEN Ming2,*,ZHANG Xiao-Hong1,*   

  1. 1 College of Life Science, Northwest A&F University, Yangling 712100, China; 2 Institute of Crop Science, Chinese Academy of Agricultural Science / National Key Facility for Crop Gene Response and Genetic Improvement / Key Laboratory of Biology and Genetic Improvement of Triticeae Crop, Ministry of Agriculture, Beijing 100081, China; 3 Guizhou Provincial Institute of Grass Industry, Guiyang 550006, China; 4 College of Agronomy, Northwest A&F University, Yangling 712100, China
  • Received:2015-02-11 Revised:2015-06-01 Published:2015-11-12 Published online:2015-06-29

摘要:

在植物生长、发育和胁迫响应等生物学过程中发挥重要作用。本研究通过序列比对,从谷子中克隆到亚基基因。进化树分析显示,基因在进化上属于亚族,与玉亚基基因亲缘关系较近。表达谱分析结果显示,在高盐、茉莉酸甲酯、水杨酸和脱落酸处理下表达上调,在低温和低氮处理下表达下调。亚细胞定位分析表明定位于液泡膜上。遗传转化拟南芥的耐盐性鉴定表明,在盐处理条件下,转基因株系的种子萌发率、幼苗主根长、植株鲜重及存活率显著高于野生型的。与野生型拟南芥植株相比,过表达植株体内含量减少,体内相对含水量提高。此外,萌发试验结果显示,在种子萌发后期,过表达植株对更加敏感。研究表明,谷子可以显著提高拟南芥耐盐性,这可能与其正向调控信号途径以及减少植株体内积累和水分散失有关。

关键词: 谷子, V-H+-ATPase E亚基基因, 耐盐性, 作用机制

Abstract:

The V-H+-ATPase plays an important role in processes of plant growth, development and response to stresses. In this research, SiVHA-E, a V-H+-ATPase E subunit gene, was cloned from millet by the Blast analysis against GenBank database. Phylogenetic tree showed that the gene belongs to E1/E3 subgroup and is close with ZmVHA-EL, a V-H+-ATPase E subunit from maize. The quantitative Real-time PCR (qRT-PCR) analysis revealed that the expression levels of SiVHA-E were up-regulated under treatments of high-salt, exogenous MeJA, SA, and ABA hormones, while down-regulated under stresses of cold and low nitrogen. Protein subcellular localization analysis using protoplast showed that SiVHA-E is located on tonoplast. The results of salt tolerance assay showed that the germination rate of SiVHA-E transgenic lines was significantly higher than that of wild type plant under salt stress. During seedlings period, the root lengths were significantly longer as well as fresh weight and survival rate were significantly higher in transgenic lines than in wild type plant under salt treatment. Compared with wild type plant, transgenic plant reduced the content of Na+ and increased the relative water content inside cells. In addition, the results of germination experiment used ABA showed that SiVHA-E transgenic Arabidopsis was more sensitive to ABA than wild type plant during post-germination. In short, overexpressing SiVHA-E in transgenic Arabidopsis lines enhances salt tolerance, which might be relates to positive regulation of ABA signaling pathway or reduction of Na+ accumulation and water loss in transgenic plants.

Key words: Foxtail millet, V-type H+-ATPase E subunit gene, Salt stress tolerance, Mechanism

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