OsIAA18, an Aux/IAA Transcription Factor Gene, Is Involved in Salt and Drought Tolerance in Rice

作者：Feibing Wang, Hao-fei NIU, Dongqing Xin, Yi Long, Guangpeng Wang, Zongmei Liu, Gang Li, Fan Zhang, Mingyang Qi, Yuxiu Ye, Zunxin Wang, Baolei Pei, Laibao Hu, Caiyong Yuan, Xinhong Chen · 发表于：Frontiers in Plant Science · 年份：2021 · DOI：10.3389/fpls.2021.738660 · 被引用次数：75 · 研究领域：Plant Stress Responses and Tolerance、Plant Molecular Biology Research、Photosynthetic Processes and Mechanisms

Auxin/indoleacetic acid (Aux/IAA) proteins play an important regulatory role in the developmental process of plants and their responses to stresses. A previous study has shown that constitutive expression of OsIAA18 , an Aux/IAA transcription factor gene of rice improved salt and osmotic tolerance in transgenic Arabidopsis plants. However, little work is known about the regulatory functions of the OsIAA18 gene in regulating the abiotic stress tolerance of rice. In this study, the OsIAA18 gene was introduced into the rice cultivar, Zhonghua 11 and the OsIAA18 overexpression in rice plants exhibited significantly enhanced salt and drought tolerance compared to the wild type (WT). Moreover, overexpression of OsIAA18 in rice increased endogenous levels of abscisic acid (ABA) and the overexpression of OsIAA18 in rice plants showed hypersensitivity to exogenous ABA treatment at both the germination and postgermination stages compared to WT. Overexpression of OsIAA18 upregulated the genes involved in ABA biosynthesis and signaling pathways, proline biosynthesis pathway, and reactive oxygen species (ROS)-scavenging system in the overexpression of OsIAA18 in rice plants under salt and drought stresses. Proline content, superoxide dismutase (SOD), and peroxidase (POD) activities were significantly increased, whereas malonaldehyde (MDA), hydrogen peroxide (H 2 O 2 ), and superoxide anion radical (O 2 – ) content were significantly decreased in the transgenic plants under salt and drough...