论文部分内容阅读
在－０．３Ｐａ和－１．０ＰａＰＥＧ胁迫过程中，大白菜幼苗根系膜透性，ＴＴＣ还原能力和丙二醛含量的变化显示根受到的不同程度伤害．渗透胁迫处理下，根系对钙的吸收速率在［Ｃａ２＋］＞０．７５ｍｍｏｌ／Ｌ时明显受到抑制．根系对４５Ｃａ２＋的积累能力分别在－０．３ＰａＰＥＧ胁迫５ｈ和－１．０ＰａＰＥＧ胁迫３ｈ后受到抑制．而且大白菜各器官（根、茎、叶）对４５Ｃａ２＋的吸收、转运能力在渗透胁迫下发生不同程度下降．其中叶对渗透胁迫反映最敏感．胁迫条件下，叶片各部位４５Ｃａ２＋积累明显减少．其中叶缘反映最为敏感．
During -0.3Pa and -1.0PaPEG stress, the changes of membrane permeability, TTC reducing ability and MDA content in roots of Chinese cabbage showed different degrees of root damage. Under osmotic stress, the rate of calcium uptake by roots was significantly inhibited when [Ca2 +]> 0.75 mmol / L. The root accumulation of 45Ca2 + was inhibited at -0.3PaPEG for 5h and -1.0PaPEG respectively for 3h. In addition, the uptake and transport of 45Ca2 + in Chinese cabbage organs (roots, stems and leaves) decreased with different degrees of osmotic stress. Among them, leaf is the most sensitive to osmotic stress. Stress conditions, the leaves of various parts of 45Ca2 accumulation decreased significantly. Leaf edge reflects the most sensitive.