Studies On The Physiological Mechanism Of Premature Senility Of Leaf In Super Hybrid Rice Pei'ai 64S/E32

Using early senescing super hybrid rice combination Pei'ai 64S/E32 as the material, non early senescing super hybrid rice combination Liangyoupeijiu as the control, physiological and biochemical and their change rule of flag leaf and leaf sheath at different developmental stages as well as the sword leaf's photosynthesis ability, main conclusions are follows:1. The SOD activity in Pei'ai 64S/E32's leaf and leaf sheath was remarkably lower than in the control in the entire life cycle, this indicates a close relationship between low SOD activity of Pei'ai 64S/E32 and it's premature senility.2. The content of MDA in Pei'ai 64S/E32's leaf and leaf sheath was lower than the control at the earlier and intermediate stage, but appeared remarkably rise in later stage, and was higher than in the control.3. The content of V_C in Pei'ai 64S/E32's leaf and leaf sheath was obviously lower than the control in the entire life cycle. This phenomenon indicated the in crease of the V_C content in leaf have certain function to delay Pei'ai 64S/E32's leaf blade senenscence.4. The content of V_E in Pei'ai 64S/E32's leaf at each developmental stages was lower than in the control at the same stage.In the booting stage, the earing stage and the full ripe stage ,it was remarkably lower than in the control; the changes of the content of V_E of leaf sheath was disorder.5. The content of ROS in Pei'ai 64S/E32's leaf showed constant rise in entire life cycle, obviously higher than in the control; the content of ROS in leaf sheath showed obviously rise around the grouting period,and in the grouting period ,the ripe stage and the full ripe stage were remarkably higher than in the control.6. The content of GSH in Pei'ai 64S/E32's leaf was in inferiority in contrast to...