Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 66, Issue 20, Pages 6371-6384Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erv350
Keywords
Abscisic acid; drought; G-protein subunits; qPE9-1; RGB1; rice
Categories
Funding
- National Science Foundation of China [31271622, 31272229, 31422047]
- Hi-Tech Research and Development Program ('863' project) from the Ministry of Science and Technology of China [2008AA10Z120]
- National Basic Research Program of China [2013CB127402]
- strategic leading special science and technology project of Chinese Academy of Sciences [XDB15030201]
Ask authors/readers for more resources
Heterotrimeric GTP-binding protein (G-protein)-mediated abscisic acid (ABA) and drought-stress responses have been documented in numerous plant species. However, our understanding of the function of rice G-protein subunits in ABA signalling and drought tolerance is limited. In this study, the function of G-protein subunits in ABA response and drought resistance in rice plants was explored. It was found that the transcription level of qPE9-1 (rice G gamma subunit) gradually decreased with increasing ABA concentration and the lack of qPE9-1 showed an enhanced drought tolerance in rice plants. In contrast, mRNA levels of RGB1 (rice G beta subunit) were significantly upregulated by ABA treatment and the lack of RGB1 led to reduced drought tolerance. Furthermore, the results suggested that qPE9-1 negatively regulates the ABA response by suppressing the expression of key transcription factors involved in ABA and stress responses, while RGB1 positively regulates ABA biosynthesis by upregulating NCED gene expression under both normal and drought stress conditions. Taken together, it is proposed that RGB1 is a positive regulator of the ABA response and drought adaption in rice plants, whereas qPE9-1 is modulated by RGB1 and functions as a negative regulator in the ABA-dependent drought-stress responses.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available