盐胁迫对白三叶肉细胞超微结构的影响

利用透射电镜技术对盐胁迫下白三叶叶肉细胞的超微结构进行了观察.结果表明,对照组叶肉细胞排列疏松,各种细胞器结构完整,叶绿体含少量淀粉粒和脂质球.轻度盐胁迫对叶肉细胞超微结构影响较小.中度和重度盐胁迫引起叶肉细胞超微结构的改变,对叶绿体的膜系统产生伤害,叶绿体由原来的长椭圆形变成圆球状,片层逐渐解体,外形轮廓发生变化,内...

Effect of salt stress on ultrastructure of mesophyll cells in white clover

The ultrastructural changes of mesophyll cells during salt stress were observed in white clover(Trifolium repens L.) using transmission electron microscopy.The results showed that mesophyll cells arranged loosely and various organelles structure was integrated,at the same time,some starch grains and lipid globules were presented in chloroplasts in the control group.The influence of mild salt stress on msesophyll cell ultrastructure was less.But moderate and severe salt stress induced ultrastructure changes in mesophyll cells.Chloroplast membrane system produced injury;chloroplasts changed from the long oval into around ball;the layers gradual disintegrated,and its contour changed;the minor internal layers happened light expand;the number of grana lamella reduced,and a large number of starch granules appeared;mitochondrial cristae disappearance and mitochondrial swelling,the cell internal structure changed simplify,and even degradation.