植物凯氏带化学成分、生理功能及相关调控机制的研究进展

Chemical components, physiological functions and regulation mechanism of plant Casparian strips

凯氏带是一种环绕在内皮层细胞径向壁和横向壁上的木质化和木栓化带状增厚结构.凯氏带作为一种保护性屏障,不仅可以调节物质和水分在维管束与皮层细胞之间的渗透性流动,而且在抵御盐胁迫、生物胁迫以及营养物质的选择性吸收等方面也发挥重要作用.随着近年来生物化学分析技术及遗传学研究方法的发展,凯氏带的相关研究取得了极大进展.本文简要概述了凯氏带在植物体内的组织结构、化学组成和发育过程,并重点对凯氏带生理功能、重要调控基因及其相关调控机制等方面的最新进展进行了总结,以期为凯氏带的深入研究和开发利用提供参考.

Casparian strips are diagnostically modified structure mainly appeared in the endodermis,in which the radial parts of the cell walls are characterized by the deposition of lignin and suberin in the primary cell wall.As a barrier to the apoplastic movement of solutes from the cortex to the stele,Casparian strips are essential for the exclusion of salts and pathogens,selective nutrient uptake,and many other processes.With the development of biochemical analysis techniques and genetic research methods,the research in Casparian strips was increasing and has accumulated a large number of data.In this paper,we summarize the research progress in cytological structure,development processes,chemical components of Casparian strips.We focus in particular on recent advances in physiological functions and the regulation mechanism of Casparian strips during developmental processes and the response to different environmental conditions.This review can provide significant information for further investigation on the development of Casparian strips.