Indole Acetic Acid-Amido Synthetase GH3-6 Negatively Regulates Response to Drought and Salt in Arabidopsis

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  • 1College of Agronomy, Xinjiang Agricultural University, Urumqi 830052, China
    2Hunan Provincial Key Laboratory of Phytohormones and Growth Development, Hunan Agricultural University, Changsha 410128, China
    3Shanghai Entry-Exit Inspection and Quarantine Bureau, Shanghai 200135, China

# Co-first authors

Received date: 2015-12-22

  Accepted date: 2016-04-26

  Online published: 2016-09-27

Abstract

Auxin is an important phytohormone involved in almost all aspects of plant life. GH3-6 encodes a protein possessing adenylation activity that can conjugate amino acid to indole acetic acid (IAA), which leads to temporarily or permanently inactive IAA. Here we investigated the role of GH3-6 in plant stress adaptation. The expression of GH3-6 was induced by drought, abscisic acid (ABA) and high salt. Compared with the wild type, transgenic plants with GH3-6 overexpression (named dfl1-D) were sensitive to drought and lost more water from detached rosette leaves. dfl1-D also exhibited hyporesistance to high salt. In addition, overexpression of GH3-6 inhibited the expression of stress-responsive genes, including RD22, KIN1, RD29A and DREB1A. The content of ABA was lower in dfl1-D than the wild type under drought treatment. Overexpression of GH3-6 negatively regulates stress resistance in Arabidopsis.

Cite this article

Xiaodong Liu, Ruozhong Wang, Binbin Jiao, Peihong Dai, Yue Li . Indole Acetic Acid-Amido Synthetase GH3-6 Negatively Regulates Response to Drought and Salt in Arabidopsis[J]. Chinese Bulletin of Botany, 2016 , 51(5) : 586 -593 . DOI: 10.11983/CBB15223

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