1. The miR165/166 Mediated Regulatory Module Plays Critical Roles in ABA Homeostasis and Response in Arabidopsis thaliana.
- Author
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Yan, Jun, Zhao, Chunzhao, Zhou, Jianping, Yang, Yu, Wang, Pengcheng, Zhu, Xiaohong, Tang, Guiliang, Bressan, Ray A., and Zhu, Jian-Kang
- Subjects
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HOMEOSTASIS , *PLANT growth , *GERMINATION , *PLANT development , *ABIOTIC stress - Abstract
The function of miR165/166 in plant growth and development has been extensively studied, however, its roles in abiotic stress responses remain largely unknown. Here, we report that reduction in the expression of miR165/166 conferred a drought and cold resistance phenotype and hypersensitivity to ABA during seed germination and post-germination seedling development. We further show that the ABA hypersensitive phenotype is associated with a changed transcript abundance of ABA-responsive genes and a higher expression level of ABI4, which can be directly regulated by a miR165/166 target. Additionally, we found that reduction in miR165/166 expression leads to elevated ABA levels, which occurs at least partially through the increased expression of BG1, a gene that is directly regulated by a miR165/166 target. Taken together, our results uncover a novel role for miR165/166 in the regulation of ABA and abiotic stress responses and control of ABA homeostasis. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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