植物内皮层的分化及其屏障功能研究进展

植物根系最主要的作用之一是从土壤中获取养分并将其运输至地上部。水和营养物质径向穿过根的表皮、皮层、内皮层等所有外部细胞层,才能到达中柱,以供地上部代谢所需。其中,内皮层细胞在发育过程中会经历两个特殊的分化阶段,分别形成凯氏带和木栓层两种扩散屏障,二者在控制养分获取与流失方面起着重要的作用。该文就近年来国内外有关植物内皮层分化过程及其屏障功能方面的研究进展进行了综述,以期对深入探索内皮层屏障在植物生长发育和逆境适应中的作用提供参考,为植物育种工作开辟新的思路。

Research Progress on Differentiation and Barrier Function of Endodermis of Plant

One of the most important functions of plant roots is to uptake nutrients from the soil and upwards them to the aerial parts. Water and nutrients are transported across epidermis, cortex and endodermis of the concentric root cell layers before reaching the central vasculature for aboveground metabolism. The endodermis undergoes two stages of differentiation with forming two diffusion barriers, Casparian strips and suberin lamellae, which play important roles in controlling nutrients acquisition and loss. This review summarizes the research progress of endodermal differentiation and barrier function in the past few years, and put forward the future research directions, so as to provide a theoretical basis for the further exploring the role of endodermal barrier in plant growth and development, as well as stress adaptation, and opens up a new thought for plant breeding in turn.