麦根腐长蠕孢毒素对抗病和感病小麦品种叶组织超微结构的影响  

ULTRASTRUCTURE OF LEAF TISSUES OF RESISTANT OR SUSCEPTIBLE WHEAT EXPOSED TO TOXIN PRODUCED BY HELMINTHOSPORIUM SATIVUM

作　　者：高必达[1] 吴畏[1] 程晖[1] 吴友三[1] 

机构地区：[1]沈阳农业大学植物免疫室

出　　处：《植物病理学报》1993年第2期107-113,共7页Acta Phytopathologica Sinica

基　　金：国家教委高教科学技术基金

摘　　要：用3种浓度的麦根腐长蠕孢毒素处理小麦5日苗第一叶,引起了显著的超微结构变化,包括细胞壁变形,中胶层分解;质膜内陷,质壁分离;叶绿体和线粒体局部破裂,内部间质电子透明化;叶绿体片层膨胀,排列紊乱,线粒休嵴膨胀,颗粒化甚至空泡化。损害发生得最早最严重的是线粒体嵴。抗病品种比感病品种膜系统受害轻,近细胞壁处有电子密集物沉积。讨论了此毒素的作用位点以及小麦耐毒素的可能机制。An ultrastructural study was made of the primary leaves of R-type or S-type wheat exposed to helminthosporal toxin,a phytotoxin produced by H.sativum,at three concentrations.A series of subcellular changes were observedsuch as invaginated plasma membranes,swollen cristae,electronlucent matrixand disrupted outer-membranes of mitochondria,dilated and distorted granalamellae and disrupted envelop membranes of chloroplasts,collapsed cell wallsand plasmolysis.The damages on membrane systems of the cells occurred more slightly and later in the R-type cv.than in the S-type cv.The action sites of the toxin on the wheat cells and the tolerance mechanism of wheatleaf tissues to the toxin were discussed.

关 键 词：小麦 品种 叶 根腐病 长蠕孢毒素 

分 类 号：S435.121[农业科学—农业昆虫与害虫防治]