【摘要】 应用透射电子显微镜观察0(对照),3,9 g/L盐胁迫4个月下美国白蜡和滨梅根系细胞超微结构的变化。结果表明:低盐(3 g/L)胁迫下,美国白蜡根系细胞质凝聚,质壁分离明显,细胞器降解严重,细胞核核膜部分解离,细胞壁基本正常;滨梅变化不明显。高盐(9 g/L)胁迫下,美国白蜡受到深度伤害,细胞质进一步降解,质壁分离严重;滨梅细胞内降解物质明显增多,细胞器降解,细胞核染色质浓度降低,核膜模糊,细胞质膜局部发生内陷,没有发生明显的质壁分离。比较而言,美国白蜡根系细胞受损较为严重,滨梅表现出较强的抗盐性。更多还原

【Abstract】 The ultrastructural changes of root cells of Fraxinus americana and Prunus maritima under different salt stresses(CK,3 g/L,9 g/L) for four months were studied by applying transmission electron microscopy.The results showed that the cytoplasm of root cells of Fraxinus americana agglomerated,and the plasmolysis was obvious,organelles were seriously degraded under low-salt stress(3 g/L),The nuclear membrane was partially dissociated from the nuclear,but the root cell wall structure of F.americana was basically normal.While there were no significant changes to root cells of Prunus maritima.Under high-salt stress(9 g/L),root cells of Fraxinus americana were severely damaged,plasmolysis was further developed.While there were more degraded materials accumulated in the root cells of Prunu maritima,and the organelles were degraded under high salt stress.The concentration of nuclear chromatin declined and the nuclear membrane became fuzzy.The cytoplasmic membrane was partially invaginated but there was no obvious plasmolysis observed in the root cells of P.maritima.In comparison,root cells of Fraxinus americana were more seriously damaged under salt stress and Prunus maritima exhibited to be more resistant to salt stress.更多还原