NO在植物生长发育和环境胁迫响应中的作用

一氧化氮(NO)是具有生物活性和信号转导作用的气体活性分子,它不仅对植物的许多生命活动如种子萌发、生长和衰老等具有直接的生理调节功能,而且作为防御反应中的关键信使,参与了植物对外界环境胁迫的响应,如干旱胁迫、热胁迫、盐胁迫、UV-B辐射、臭氧胁迫、重金属胁迫、机械损伤以及植物抗病反应。NO与各种激素如乙烯、脱落酸、水杨酸、生长素和细胞分裂素等,在调节植物的生理活动与信号转导方面有明显的协同作用,通过激素起作用可能是植物内源NO作用的机理之一。探明在正常生长状况下植物内源NO对植物生长发育的调控机制及其参与信号转导的生理机制是目前研究的重点。

Role of nitric oxide in plant development and stress responses

Nitric oxide is a bioactive and signal transmitting molecule that does not only directly exert physiological regulations on many life activities of plants such as germination, growth and senescence but also participates in the adapting of plants to environmental stresses working as the key signal carrier in defense response, such as drought stress, heat and chilling stress, salt stress, UV-B radiation, and ozone exposure, heavy metal, mechanical stress and disease resistance. Nitric oxide presents synergistic effects with phytohormones in physiological regulation and signal transmission, such as Ethylene, Abscisicacid, Saliccylicaeid, indole-3-acetic acid and cytokinin, it is one of nitric oxide regulation mechanisms for plants to resorts to phytohormones to play its physiological functions. In present, it is an important study to investigate endogenous NO mechanisms for plants physiological regulation and signal transmission.