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淹水对玉米叶片细胞超微结构的影响
引用本文:魏和平,得容千.淹水对玉米叶片细胞超微结构的影响[J].Acta Botanica Sinica,2000,42(8):811-817.
作者姓名:魏和平  得容千
作者单位:武汉大学生命科学学院!武汉430072
摘    要:对淹水过程中玉米(Zea mays L.)叶片细胞超微结构的变化进行连续观察。淹水2h后,液泡膜发生明显内陷。淹水6h后,液泡膜内陷加剧,呈极度松弛状态;叶发体被膜局部向外突出一个由单层膜包裹的泡状结构。淹水12h后,液泡膜局部破裂;叶绿体被膜破坏加剧,成为一松弛的单膜结构,同时,基质类囊体出现空泡化。淹水18h后,叶绿体的破坏进一步加剧:被膜完全消失,基质类囊体开始消化;同时,线粒体膜和核膜也开

关 键 词:淹水  玉米  叶片细胞  超微结构

Ultrastructural Changes in Leaf Cells of Submerged Maize
Abstract:The ultrastructural changes in leaf cells of submerged maize (Zea mays L.) were observed. After 2 h under submergence, an inward collapse of tonoplast was immediately observed while other cell components remained unaltered. After 6 h under submergence, the chloroplast envelope started to degrade and the inward collapse of tonoplast became more prominent. Until 12 h under submergence, localized splitting of the tonoplast appeared; the stromatic thylakoid membrane of the chloroplast started to be vacuolated when its envelope underwent further degradation. With prolongation of submergence to 18 h, the injury of chloroplast was enhanced. As the envelope was completely destroyed and disappeared and degraded the stromatic thylakoid membrane degraded. Meantime, the mitochondrial and nuclear membrane also started to be destroyed. During 24-48 h under submergence, the chloroplast, mitochondria and nucleus of the anoxic leaf cells became gradually disintegrated. Finally, under 72 h of submergence, the leaf cells became completely degraded with little condensed contents. The results indicated that the injury in membrane structure of various organelles, especially vacuole and chloroplast, was closely associated with the eventual demise of leaf cells of the submerged maize.
Keywords:submergence  maize  leaf cell  ultrastructure
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