.硅在植物体内的分布和吸收及其在病害逆境胁迫中的抗性作用.pdfVIP

2010, 30( 10): 2745 2755 Acta Ecologica Sinica 1, 2 1 1, * 1 高 丹 , 陈基宁, 蔡昆争 , 骆世明 ( 1. , 510642; 2. , 100193) : , , , [ Si( OH ) ] , 4 , , , , ( )(), , , , ( ) : ; ; ; ; D istri ution and a sorption of silicon in plant and its role in plant disease resistance under environmental stress 1, 2 1 1, * 1 GAO Dan , CHEN Jin ing, CA IKunzheng , LUO Shmi ing 1Key Laboratory of EcologicalAgriculture of M inistry of Agriculture, South ChinaAgricultural University, Guangzhou 510642, China 2 College of Resources and Environmental Sciences, China Agricultural University, eij ing 100193, China A stract: Silicon ( S i) is the second largest abundantm ineral elem ent in the earth s crust. A lthough S i is stillnot listed as an essential elem ent for the m ajority of plant species, it plays mi portant roles in stmi ulating plant grow th and nutrition upta e and enhancing plant resistance to abiotic and biotic stresses. This paper rev iew ed the d istribution and absorption of S i in plant and its physiological functions w ith focusing on the m echanism s of Si m ediated pathogen resistance. H igher plants mainly ta e up S i in the form of [ S i(OH) ], and there are active and passive Si upta e mechan ism s. Silicon can 4 deposit in the epiderm al cell walls beneath the cuticle, form a cuticleSi double layer and enhance cellw allm echanical strength and stab ility, and therefore retard and resist pathogen from penetration and spreading. M ore research ev idence show s that S itreated plants can significantly increase the activ ity of protective enzym es such as perox idase, polyphenol oxidase,