首页|期刊导航|中国农业科学（英文版）|Effect of Potassium on Ultrastructure of Maize Stalk Pith and Young Root and Their Relation to Stalk Rot Resistance
中国农业科学（英文版）2010，Vol.9Issue(10)：1467-1474,8.DOI:10.1016/S1671-2927(09)60239-X
Effect of Potassium on Ultrastructure of Maize Stalk Pith and Young Root and Their Relation to Stalk Rot Resistance
Effect of Potassium on Ultrastructure of Maize Stalk Pith and Young Root and Their Relation to Stalk Rot Resistance
摘要
Abstract
To study the mechanism of potassium(K)application on improvement of maize resistance to stalk rot at cellular level,scanning electron microscope and transmission electron microscope were used to observe the effect of K on the ultrastructure of maize stalk pith tissue and young root tip cell influenced by K and pathogen.In K deficient treatment,parenchyma cells of stalk pith had abnormal structure,and the cell wall between upper and lower adjacent cell was damaged,resulting in the loss of connections between vascular cells and insufficient supporting capacity.However,an improved K nutrition helped to keep a quite tight arrangement of root cell with thick cell wall,and prevent the invasion of pathogen effectively.Moreover,K treated root cell had abundant golgi apparatus,which could excrete large amount of secretions to degrade mycelium.Papillary and highly electronic intensity dot were accumulated at the invading point to prevent the development of the mycelium.Improved K nutrition could increase the resistant ability of maize plant to stalk rot,through keeping cell structure stability,preventing the expansion of intracellular space to reduce the chances of pathogen invasions,and through reinforcing cell wall and formation of intercellular and intracellular material to restrict further development of pathogen in host cell.关键词
potassium(K)/maize stalk rot/ultrastructure/disease resistanceKey words
potassium(K)/maize stalk rot/ultrastructure/disease resistance分类
农业科技引用本文复制引用
LI Wen-juan,HE Ping,JIN Ji-yun..Effect of Potassium on Ultrastructure of Maize Stalk Pith and Young Root and Their Relation to Stalk Rot Resistance[J].中国农业科学（英文版）,2010,9(10):1467-1474,8.基金项目
This research was supported by the National Basic Research Program of China(973 Program,2007CB109306),the National Natural Science Foundation of China(30571018),the Natural Science Foundation of Beijing, China(6062025),and the International Plant Nutrition Insitute. （973 Program,2007CB109306）
