植物根中质外体屏障结构和生理功能研究进展

综述了近10年来植物根中质外体屏障结构和功能的研究进展。质外体屏障指根中内、外皮层初生壁的凯氏带，或次生壁栓质化和木质化，以及植物体表角质层组成的保护组织，能隔绝水、离子和氧气不能自由进出植物体的屏障结构，具有保护植物体的生理功能。根中凯氏带的分子发育机理研究表明根内皮层类似哺乳动物上皮组织的保护作用。植物根中质外体保证内部各种生理代谢在稳定的内部环境中进行，是植物适应各种逆境的重要屏障结构。根中质外体屏障在植物适应干旱、洪涝灾害、离子胁迫和病虫害的侵袭等方面具有重要作用，在探索适应并修复极端生态环境的植物资源中有广阔的应用前景。

Progress on the Structure and Physiological Functions of Apoplastic Barriers in Root

The progress on the structure and physiological functions of apoplastic barriers in root is presented for recently ten years. The apoplastic barriers consist of the cell wall with Casparian bands, suberin lamellae or lignin which showed as protective tissue, that tight block water, ion and oxygen between plant and environment. The molecular information of Casparian bands indicated the endodermis similar to tight junctions of epithelial barrier. The apoplastic barriers are the key structure for plant adapted to adverse environment that guarantee various physiological and biochemical reactions processing under steady inner surroundings. The apoplastic barriers reacted well to drought, flooding, ion deficiency, and disease stresses, and broadly applied to explore plant resource to adapt and restore the extreme environment.