镉对离体叶片光合、呼吸强度及细胞膜透性的影响

Effect of Cadmium on Photosynthetic Rate, Respiratory Rate and Membrane Permeability of Isolated Leaf Disc

用镉处理离体的烟草叶片，０．００５ｍｍｏｌ／Ｌ镉处理就引起光合速率降低，０．０２７ｍｍｏｌ／Ｌ镉处理引起叶绿素含量下降，０．１ｍｍｏｌ／Ｌ镉处理引起膜透性增加，随着处理浓度的增加及处理时间的延长，光合速率、叶绿素含量下降程度增加，膜受损程度也增加，而呼吸速率则呈现出降低－增加－降低的变化。

Isolated tobacco leaves were treated with cadmium, the treadment of 0. 005mmolCd/L caused the decreasing of photosynthetic rate, 0. 0275 mmolCd/L resulted in decreasing of chlorophyll content and 0. 1 mmolCd/L cased the increasing of cell membrane permeability. As the increament of Cd concentration and the duration of treatment, the photosynthetic rate and chlorphyll content decreased further. the damaging degree of membrane increased, while the variation Of respiratory rate appeared decreasing-increasing-decreasing.