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首页> 外文期刊>Journal of Experimental Botany >Calcium-sensing receptor regulates stomatal closure through hydrogen peroxide and nitric oxide in response to extracellular calcium in Arabidopsis
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Calcium-sensing receptor regulates stomatal closure through hydrogen peroxide and nitric oxide in response to extracellular calcium in Arabidopsis

机译：钙敏感受体响应拟南芥中的细胞外钙，通过过氧化氢和一氧化氮调节气孔关闭

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摘要

The Arabidopsis calcium-sensing receptor CAS is a crucial regulator of extracellular calcium-induced stomatal closure. Free cytosolic Ca2+ (Ca2+i) increases in response to a high extracellular calcium (Ca2+o) level through a CAS signalling pathway and finally leads to stomatal closure. Multidisciplinary approaches including histochemical, pharmacological, fluorescent, electrochemical, and molecular biological methods were used to discuss the relationship of hydrogen peroxide (H2O2) and nitric oxide (NO) signalling in the CAS signalling pathway in guard cells in response to Ca2+o. Here it is shown that Ca2+o could induce H2O2 and NO production from guard cells but only H2O2 from chloroplasts, leading to stomatal closure. In addition, the CASas mutant, the atrbohD/F double mutant, and the Atnoa1 mutant were all insensitive to Ca2+o-stimulated stomatal closure, as well as H2O2 and NO elevation in the case of CASas. Furthermore, it was found that the antioxidant system might function as a mediator in Ca2+o and H2O2 signalling in guard cells. The results suggest a hypothetical model whereby Ca2+o induces H2O2 and NO accumulation in guard cells through the CAS signalling pathway, which further triggers Ca2+i transients and finally stomatal closure. The possible cross-talk of Ca2+o and abscisic acid signalling as well as the antioxidant system are discussed.
机译：拟南芥钙敏感受体CAS是细胞外钙诱导的气孔关闭的关键调节剂。游离胞质Ca 2 + （Ca 2 + i ）随高细胞外钙（Ca 2 + o ）水平通过CAS信号传导途径，最终导致气孔关闭。使用多学科方法，包括组织化学，药理学，荧光，电化学和分子生物学方法，探讨过氧化氢（H 2 O 2 ）与一氧化氮（NO）的关系。 Ca 2 + o 对保卫细胞CAS信号通路中的信号转导。在这里显示Ca 2 + o 可以诱导保卫细胞产生H 2 O 2 和NO，但是叶绿体中只有H 2 O 2 ，导致气孔关闭。此外，CASas突变体，atrbohD / F双突变体和Atnoa1突变体均对Ca 2 + o 刺激的气孔闭合以及H <对于CASas，sub> 2 O 2 和NO升高。此外，还发现抗氧化剂体系可能在Ca 2 + o 和H 2 O 2 o 诱导保卫细胞中H 2 O 2 和NO的积累通过CAS信号通路，进一步触发Ca 2 + i 瞬变并最终导致气孔关闭。讨论了Ca 2 + o 与脱落酸信号传递以及抗氧化系统之间可能的串扰。

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