蓝光对水稻幼苗呼吸代谢的影响

 就蓝光对水稻幼苗呼吸代谢的影响进行了研究。蓝光下生长幼苗叶片呼吸速率较白光幼苗提高了50%。蓝光处理提高了幼苗丙酮酸激酶和苹果酸脱氢酶的活性。丙二酸和正磷酸钠对蓝光幼苗叶片呼吸速率的抑制率分别为76%和24%；而对相应的白光幼苗的抑制率分别为70%和32%。这些结果说明蓝光主要是通过EMP-TCA途径而加强呼吸。蓝光处理提高了幼苗叶片ATP含量。

Effect of Blue Light on the Respiration of Rice(Oryza sativa) Seedlings

Effect of blue light on the respiration of rice seedlings was studied.The respiratory rate of leaves in blue-light-grown seedlings was about 1.5 times over that in white-light-grown seedlings.Measurement of activities of key enzymes in respiratory pathways showed that the activities of pyruvate kinase and malate dehydrogenase were higher in blue light treatment.Using respiratory inhibitors,we have demonstrated that malonic acid inhibited 76%of total respiration in blue-light-grown seedlings and 70% in white-light-grown seedlings,and Na3PO4 only inhibited 24% and 32% of total respiration in blue-light and white-light-grown seedlings respectively.Those results indicated that the enhancement of seedling respiration caused by blue light was mainly from strengthening EMP-TCA pathway.The leaf ATP content was increased after blue light irridiation.