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.