摘要
当绿豆幼苗在自然条件下生长到12d龄时,剪下第一对叶片,漂浮在水面,以蓝光荧光灯照射叶片,用白光和黑暗为对照。蓝光处理可延缓叶片叶绿素和蛋白质含量的降低,促进气孔的开放,维持SOD活性在较高的水平,从而延缓了质膜相对透性的增大。因此,我们认为,蓝光可以延缓绿豆幼苗离体叶片的衰老。
When mung bean seedlings were grown under natural condition for 12 days, leaves were cut off and floated on water. These detached leaves were treated with dark, white light and blue light respectively. The light intensity was 10 ± 2 μmol· m-2s-1. Some physiological parameters were determined during 8 days of treatment.
As compared with the treatment in the dark, the treatments with blue and white lights were more effective in retarding the losses of chlorophyll and protein. However, there were no sig nif-icant difference in contents of these two substances under white and blue lights. In addition, blue light led up to the obvious opening of stomata and the increase of transpiration rate. After blue light illumination, SOD activity was maintained at a higher level and the increase of relative permeability of plasmalemma was retarded. The results indicate that blue light is able to retard the senescence in detached leaves of mung bean seedling.
