Rice G-protein subunits qPE9-1 and RGB1 play distinct roles in abscisic acid responses and drought adaptation

Dong Ping Zhang, Yong Zhou, Jian Feng Yin, Xue Jiao Yan, Sheng Lin, Wei Feng Xu*, František Baluška, Yi Ping Wang, Yiji XIA, Guo Hua Liang, Jian Sheng Liang

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

71 Citations (Scopus)


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 Gγ 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 Gβ subunit) were signifcantly 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.

Original languageEnglish
Pages (from-to)6371-6384
Number of pages14
JournalJournal of Experimental Botany
Issue number20
Publication statusPublished - Oct 2015

Scopus Subject Areas

  • Physiology
  • Plant Science

User-Defined Keywords

  • Abscisic acid
  • Drought
  • G-protein subunits
  • QPE9-1
  • RGB1
  • Rice


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