溃疡病菌在杨树树皮组织中的扩展和对寄主细胞超微结构的影响  

Histopathology and Ultrastructure of Periderm Parenchyma Cells on Poplar Stem in Response to the Infection of Botryosphaeria dothidea

作　　者：赵仕光[1] 朱玮[1] 岳红艳[1] 

机构地区：[1]西北林学院

出　　处：《林业科学研究》1999年第2期118-126,共9页Forest Research

基　　金：1994年国家自然科学基金;1997年西北林学院课题

摘　　要：病理解剖和超微结构研究发现，溃疡病菌是在胞间隙和被分解了的细胞壁中穿行的；其对寄主组织最直接的危害是分解并利用细胞壁，破坏寄主组织细胞结构；抗病的毛白杨在被病菌侵害后，细胞内形成高电子密度的羽形结晶状沉积物，细胞壁膨胀而不疏散，而感病的北京杨和中抗的陕林４号杨在被病菌侵害后，细胞内并不形成类似毛白杨的沉积物，它们的细胞壁因侵染而变得膨胀且松散，毛白杨与北京杨、陕林４号杨在细胞壁结构上的不同，可能是毛白杨产生抗病性的原因之一。The infection process of Botryosphaeria dothidea in the bark of poplar and the response of poplar bark to the infection were studied. By the use of phenoamonia blue,the infected and response cells can be stained blue and thus differed from the normal cells. As the fungus progressed in the periderma,they were always intercelluse of mycothirum cells,cells 46 layers around can be affected and cytoplasima condensed into protrusions.After 40 days, phenoderma formed between the necotic tissues and normal cells,and the resistant poplar have a thicker new periderm than that of the susceptible one. Above all, the resistant poplar can form a boundary of stindark tyloses in the new periderm cells which may take the role as to restructed the hyphae from continued expansion. There is no such a boundary in the wounded but uninoculated controls. Ultrastructure study by electron micrographs showed that mycelium were abounded in the susceptible cultivars and always exist between cells or in the swollen and thickened or dissolved cell walls. In the cells of resistant poplars,a kind of electron dense, hairlike,crystal deposit were formed.

关 键 词：杨树 溃疡病菌 组织病理 超微结构 

分 类 号：S763.150.1[农业科学—森林保护学] S763.721.1[农业科学—林学]