中文摘要：

为了在玉米抵抗的改进上学习钾(K) 申请的机制走，在细胞的水平腐烂，扫描电子显微镜和传播电子显微镜被用来在玉米梗木髓织物和 K 和病原体影响的年轻的根尖端房间的超微结构上观察 K 的效果。在 K 缺乏的处理，梗木髓的实质房间有反常结构，并且在上面、更低的邻近的房间之间的房间墙被损坏导致在脉管的房间和不够的支持能力之间的连接的损失。然而，改进 K 营养帮助与厚房间墙保留根房间的相当紧密的安排，并且有效地阻止病原体的侵略。而且， K 对待根房间有丰富的 golgi 仪器，它能排泄降级的大量分泌物菌丝体。乳突、高度电子的紧张点在入侵的点被积累阻止菌丝体的发展。改进 K 营养能增加玉米植物的抵抗能力走腐烂，通过保留房间结构稳定性，阻止细胞内部的空间的扩大减少病原体侵略的机会，并且通过增强，细胞间、细胞内部的材料的房间墙和形成在主人房间推进病原体的开发限制。

英文摘要：

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 deveJopment 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.