茉莉酸甲酯对水稻幼苗光呼吸代谢的影响

EFFECT OF METHYL JASMONATE ON THE PHOTORESPIRATORY METABOLISM OF RICE SEEDLINGS

摘要:

经2．5×10-4mol／L茉莉酸甲酯（MJ）处理后的水稻幼苗，在处理后第2天即表现出RuBP加氧酶活性的明显升高，至处理后第4天，叶片中乙醇酸氧化酶的活性也升高，同时叶片中的乙醇酸累积量也明显高于对照。经α-HPMS预处理后的幼苗叶片材料中，这种乙醇酸累积量升高的程度更大，表明2．5×10-4mol／LMJ处理能促进水稻幼苗光呼吸的增强，但2．5×10-7mol／LMJ处理对叶片中乙醇酸的累积和光呼吸过程中的有关酶系没有影响。

Abstract:

Rice seedlings treated with methyl jasmonate (MJ) showed that the activity of RuBP oxygenase in leaves was apparently increased since the second day after 2.5 x 10-4 mol/L MJ treatment, and the activity of glycolate oxidase markedly increased on the fourth day. Meanwhile the accumulation of glycolate in leaves of rice seedlings was also enhanced, and the content of glycolate was increased more markedly when the leaves were pretreated with a-HPMS. These results indicated that the treatment with 2.5 x 10-4 mol/L MJ could hasten the photorespiration of rice seedlings. But the accumulation of glycolate and the activities of some enzymes related to photorespiratory process were not affected by the treatment with 2.5 x 10-7 mol/L MJ.