乙烯代谢途径中基因表达与器官脱落研究进展

Advance in organ abscission in relation to expression of genes associated with ethylene metabolic pathway

器官脱落是一种由各种因素共同调节的复杂生理过程,多种激素对其都有影响,其中乙烯对脱落的影响最大。乙烯含量的上升和器官脱落正相关,但乙烯含量的上升和器官脱落之间并非相邻的两个步骤。器官脱落首先须使植物体本身乙烯合成量增加,之后通过乙烯受体基因和乙烯进行结合,再通过乙烯信号传递体把乙烯上升信号传递下去,从而引起离区细胞壁水解酶活性增强和基因表达量上升,进而导致离区细胞壁发生破碎,最终导致器官脱落。综述了乙烯代谢途径中的乙烯合成、膜上乙烯受体、乙烯膜内信号传递体与器官脱落的研究进展。

Organ abscission is a kind of complex physiological process,which regulated by various iactors. Hormone intluenced the process, especially, ethylene. The relationship between ethylene rise and organ abscission was positived. But the rise of ethylene to organabscissionwere not adjacent two steps. It contained many process. Firstly, the synthesis of ethylene must be increased. The next step was to combine ethylene with the ethylene receptor genes. And then passed the signal down through the regulator of the ethylene. Then increased the activity and genes expression of the cell wall hydrolases,leading to the cell wall degradation of abscission zone and the organ abscission ultimately. Therefore, this paper summarized the new research progress in the ethylene biosynthesis, ethylene receptor, and the regulator of the ethylene response pathway when organ occurred fall off.