乙烯的生物合成与信号及其对种子萌发和休眠的调控

宋松泉,刘军,徐恒恒,张琪,黄荟,伍贤进

Biosynthesis and signaling of ethylene and their regulation on seed germination and dormancy

Song-Quan SONG,Jun LIU,Heng-Heng XU,Qi ZHANG,Hui HUANG,Xian-Jin WU

图3 乙烯、脱落酸和赤霉素在种子萌发和休眠调控中的相互作用 该方案是基于正文中引证的种子对乙烯、脱落酸或者GA响应的遗传分析、芯片数据和生理研究。乙烯通过抑制ABA的合成和促进它的失活或者分解代谢下调ABA的积累, 也负调控ABA信号。ABA通过ACS和ACO的活性抑制乙烯的生物合成。乙烯也增强GA的代谢和信号, 反过来也一样。“→”和“┤”分别表示信号级联的不同元素之间的正、负相互作用。根据Corbineau等[16]重绘。

Fig. 3 Interaction among ethylene, abscisic acid, and gibberellin in the regulation of seed germination and dormancy This scheme is based on genetic analyses, microarray data, and physiological studies on seed responsiveness to ethylene, ABA or GA cited in the text. Ethylene down-regulates ABA accumulation by both inhibiting its synthesis and promoting its inactivation or catabolism, and also negatively regulates ABA signaling. ABA inhibits ethylene biosynthesis through ACS and ACO activities. Ethylene also improves the GA metabolism and signaling, and vice versa. “→” and“ ┤” indicate positive and negative interactions between the different elements of the signaling cascade, respectively. Redrew from Corbineau et al. [16].