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首页> 外文期刊>Journal of Experimental Botany >Rice G-protein subunits qPE9-1and RGB1 play distinct roles in abscisic acid responses and drought adaptation
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Rice G-protein subunits qPE9-1and RGB1 play distinct roles in abscisic acid responses and drought adaptation

机译：水稻G蛋白亚基qPE9-1和RGB1在脱落酸反应和干旱适应中发挥不同的作用

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摘要

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.
机译：异三聚体GTP结合蛋白（G蛋白）介导的脱落酸（ABA）和干旱胁迫反应已在许多植物物种中得到了证明。但是，我们对水稻G蛋白亚基在ABA信号传导和抗旱性中的功能的了解是有限的。在这项研究中，探讨了G蛋白亚基在水稻ABA反应和抗旱性中的作用。结果发现，随着ABA浓度的增加，qPE9-1（大米Gγ亚基）的转录水平逐渐降低，而缺少qPE9-1则表明水稻植株的耐旱性增强。相反，ABA处理显着上调了RGB1（大米Gβ亚基）的mRNA水平，而RGB1的缺乏导致干旱耐受性降低。此外，结果表明，qPE9-1通过抑制参与ABA的关键转录因子的表达和逆境反应来负调控ABA反应，而RGB1在正常和干旱胁迫条件下均通过上调NCED基因表达而正调控ABA生物合成。两者合计，建议RGB1是水稻植物ABA响应和干旱适应的正调节剂，而qPE9-1受RGB1调节并在ABA依赖性干旱胁迫响应中充当负调节剂。

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