摘要
光呼吸抑制剂2,3-环氧丙酸钾对水稻光合功能具有明显的改善作用,不论在整体叶片水平还是在离体叶绿体条件下,均能提高光系统Ⅱ(PSⅡ)的活性和原初光能转化效率;提高叶绿体的 PSⅡ和光系统Ⅰ(PSⅠ)及全链(PSⅡ+PSⅠ)的电子传递速率;同时它还可以提高镁离子(Mg^(2+))和叶绿体膜蛋白磷酸化对两个光系统之间光能分配的调节能力。结果表明了2,3-环氧丙酸钾在水稻生产上有一定应用前景。
The photosynthetic functions of rice were obviously improved by pretreatment with 150 ppm 2,3-epoxypropionate.The activity of Photosystem Ⅱ(PSII)and the efficiency of primary conversion of light energy of PSII detected either with intact leaves or chloroplasts were en- hanced by pretreatment of 2,3-epoxypropionate.Electron transport rate of PSII,Photosystem Ⅰ (PSI)and the whole chain in chloroplasts were higher than those in untreated ones.It was also confirmed that the capacity of excitation energy distribution between PSII and PSI which was regulated by Mg^(2+) or phosphorylation of chloroplast membrane proteins in pretreated rice was larger than that in the control From these results it can be predicted that 2,3-epoxypropionate will have some prospect for practical application to rice production.
