盐胁迫对刺槐不同组织及细胞离子吸收和分配的变化

The changes of ion absorbing and distribution in different organ and cell of Robinia pseudoacacia seedlings for salt stress.

该文从器官水平和细胞水平对盐胁迫后的刺槐苗离子含量进行分析 ,比较了不同组织膜透性和盐离子在刺槐组织及细胞中的分配特点 .研究表明 :随胁迫时间的延长 ,叶片细胞膜系统受到的伤害比根部细胞膜系统大 .根部的Na+含量较高 ,其分布量的顺序是根 >茎 >叶 ,叶片中盐离子含量较低 ,从而减少了盐胁迫对地上部的毒害 ;K+的含量则与Na+相反 ,其分布量的顺序为 :叶 >茎 >根 ,幼嫩的组织中分布较多 ,以保证植物正常的代谢活动 .刺槐根皮层细胞的液泡中积累Na+和Cl-的量远高于细胞质 ,说明刺槐的根皮层细胞对Na+和Cl-具有一定的区隔化作用 .刺槐叶肉细胞的细胞壁、细胞质和液泡中Na+和Cl-的含量没有明显差别 .测定结果表明 。

This paper analyzes the ion content of salt stress in Robinia pseudoacacia seedlings both on organ and cellular level, compares the ion permeability in different tissues and the characteristics in salt ion absorbing and distribution.The results show that:as salt stress increased and treatment time extended the leaves were damaged more than that of roots.Distribution of content of Na\++ was root>stem>leaf,the ion content was lower in leaf, so that the damage on ion to the parts above the ground decreased.Effects of K\++ was contrary to Na +,distribution of K + in seedlings was leaf>stem>root,and was higher in plumelet tissuse; it went to stable to ensure the metabolism of seedlings.The accumulation of Na + and Cl - in the vacuolar was much higher than that in the cytoplasm in the cell of root cortex,the cells of root cortex of Rubinia had Na + and Cl - compartmentation.The content of Na + and Cl - did not differ distinctly among the cell walls,cytoplasm and vocuole of the mesophyll cell of Robinia. The data show that its salt resistance mechanism is consistent with that in leave both on organ and cellular level.