花生叶片衰老与活性氧代谢

Leaf senescence and the metabolism of active oxygen in peannt

高产花生品种鲁花 11号和辐 870 7叶片衰老研究表明 ,花生叶片展开至衰老过程中 ,超氧化物歧化酶 (SOD)、过氧化氢酶 (CAT)、过氧化物酶 (POD)活性的变化趋势均可用Y =A +Bx +Cx2 拟合 ;叶片丙二醛(MDA)含量、活性氧 (O2·)释放速率和质膜透性变化符合Y =AeBx。叶片展开后 2 5 30d至 5 5 60d为叶片缓衰期 ;叶片展开 5 5 60d以后为叶片速衰期。两品种相比 ,辐 870 7叶片的衰老早于鲁花 11。

The leaf senescence and the metabolism of active oxygen in peanut were studied with two high-yielding peanut cultivars (cv. Luhua No.11 and Fu 8707) in the campus and experiment farm of Shandong Agricultural University. The results showed that changes of many physiobiological characters such as activities of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) in leaves, may be simulated with a parabolic function, Y=A+Bx+Cx 2. Content of malondialdehyde (MDA), production of active oxygen (O 2 · ) and permeability of plasma membrane in leaves changed to increase after leaf unfolding during leaf senescence. These tendencies of change could be described by an exponential function of Y=Ae Bx . The leaf senescence could be divided into slow senescence phase (the leaf age was from 25~30 to 55~60 days after unfolding) and rapid senescence phase (the leaf age was from 55~60 days after unfolding to falling off). The leaf senescence of Fu8707 was earlier than that of Luhua No.11.