气体信号分子硫化氢在植物中的生理功能及作用机制

硫化氢（hydrogen sulfide，H2S）是继一氧化氮（nitric oxide，NO）和一氧化碳（carbon monoxide，CO）之后发现的第3种气体信号分子，它能参与生物体内的多种生理生化过程并发挥特定功能。在动物体内，H2S能够调节血管及神经系统功能。植物也能通过产生内源H2S来提高对环境的适应能力，缓解多种逆境胁迫造成的损伤和毒害，参与特定的生理代谢过程，诸如参与气孔运动和延缓衰老等。本文从H2S产生和代谢途径、已发现的生理功能和信号转导机制等方面综述H2S在植物中的最新研究进展，同时也探讨了H2S与其它信号分子的相互作用以及H2S对蛋白质的修饰机制。

The Physiological Function and Molecular Mechanism of Signaling Molecule Hydrogen Sulfide in Plants

Hydrogen sulfide（H2S）has been identified as the third gasotransmitter just as nitric oxide（NO）and carbon monoxide（CO）. It has been proved to participate in various physiological and biochemical processes to exert specific functions. H2S plays an important role in regulating the nervous system and the cardiovascular system in animals. In plants，H2S improves the ability of adapting to the environment,alleviates injury and toxicity caused by the stress conditions. In addition，it also participates in specific physiological and metabolic processes such as stomatal movement and delaying senescence. In this article,the latest research advances of hydrogen sulfide in plants were summarized，including its biosynthesis，metabolic pathways，physiological functions and signal transduction mechanisms. We also discussed the interaction between H2S and other gasotransmitters. The mechanism of H2S modifying proteins was also mentioned.