Nawrath Christiane, Schreiber Lukas, Franke Rochus Benni, Geldner Niko, Reina-Pinto José J, Kunst Ljerka
University of Lausanne, Department of Plant Molecular Biology, Biophore Building, CH-1015 Lausanne, Switzerland.
University of Bonn, Department of Ecophysiology of Plants, Institute of Cellular and Molecular Botany (IZMB), Kirschallee 1, D-53115 Bonn, Germany.
Arabidopsis Book. 2013 Dec 27;11:e0167. doi: 10.1199/tab.0167.
During the development of Arabidopsis and other land plants, diffusion barriers are formed in the apoplast of specialized tissues within a variety of plant organs. While the cuticle of the epidermis is the primary diffusion barrier in the shoot, the Casparian strips and suberin lamellae of the endodermis and the periderm represent the diffusion barriers in the root. Different classes of molecules contribute to the formation of extracellular diffusion barriers in an organ- and tissue-specific manner. Cutin and wax are the major components of the cuticle, lignin forms the early Casparian strip, and suberin is deposited in the stage II endodermis and the periderm. The current status of our understanding of the relationships between the chemical structure, ultrastructure and physiological functions of plant diffusion barriers is discussed. Specific aspects of the synthesis of diffusion barrier components and protocols that can be used for the assessment of barrier function and important barrier properties are also presented.
在拟南芥和其他陆地植物的发育过程中，扩散屏障在多种植物器官内特化组织的质外体中形成。虽然表皮的角质层是地上部分的主要扩散屏障，但内皮层和周皮的凯氏带和栓质化层是根部的扩散屏障。不同类别的分子以器官和组织特异性的方式促成细胞外扩散屏障的形成。角质和蜡质是角质层的主要成分，木质素形成早期凯氏带，栓质则沉积在II期内皮层和周皮中。本文讨论了我们目前对植物扩散屏障的化学结构、超微结构和生理功能之间关系的理解现状。还介绍了扩散屏障成分合成的具体方面以及可用于评估屏障功能和重要屏障特性的方案。
