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SSU72 参与气孔大小发育和干旱胁迫应答
刘亚男,陈兰,丁勇
0
(中国科学技术大学生命与医学部,中国科学技术大学生命科学学院,合肥微尺度国家物理科学实验室分子细胞生物物理研究所,合肥 230027)
摘要:
植物在受到外界环境干旱胁迫时,会启动一系列的生理反应,包括气孔的关闭和ABA的产生,然而,植物如何平衡干旱胁迫和生命周期,并不清楚。SSU72编码C末端结构域(C-terminal domain , CTD)的磷酸化酶,抑制拟南芥(Arabidopsis thaliana)的开花时间。研究发现SSU72参与拟南芥的干旱胁迫应答,SSU72定位于细胞核中,功能缺失的SSU72失水速率快、气孔大,并且气孔的关闭对ABA不敏感;进一步检测下游的基因RD29B, RD22, RD29A COR15A的表达水平,表明SSU72参与ABA和非ABA途径干旱基因的激活。因此,SSU72很可能是对环境适应的重要调节因子,平衡非生物胁迫和生长周期。
关键词:  SSU72基因  气孔  干旱胁迫  ABA
DOI:10.13610/j.cnki.1672-352x.20220106.003
投稿时间:2021-04-08
基金项目:安徽省大学协同创新计划(GXXT-2019-033)和国家自然科学基金(32000242, 32000241, 31871278 和U19A2021)共同资助。
SSU72 is involved in stomata development and dehydration stress
LIU Yanan,CHEN Lan,DING Yong
(School of Life Sciences, USTC Life Sciences and Medicine, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science & Technology of China, Hefei 230027)
Abstract:
The plant physiological adaption including stomata closure and elevated ABA concentration is crucial for survival in response to dehydration stress, however, how plant balances the dehydration and life cycle remains unclear. Here, we reported that SSU72 encoding a C-terminal domain (CTD) phosphatase is involved in flowering time. The results showed that: under dehydration stress, SSU72, localized on the nucleus, was involved in dehydration stress, and the loss of SSU72 function displayed the larger stomata size and increase of the water loss. In addition, the stomata opening was hyposensitive to ABA treatment. The transcripts of dehydration response genes, RD29B, RD22, RD29A and COR15A, were reduced in SSU72 mutant with or without dehydration stress, indicating SSU72 may activate drought stress response in ABA and non-ABA pathways. Together, our study provides a new insight that SSU72 might be a novel factor involving in environmental adaptation, balancing abiotic stress and growth cycle.
Key words:  SSU72  stomata  dehydration stress  ABA

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