光对小麦幼叶脂氧合酶活性及膜脂过氧化作用的影响

选用抗旱型小麦品种陕合６号和水分敏感型小麦品种郑引１号的黄化幼苗为材料，研究了光处理对小麦幼叶脂氧合酶活性和膜脂氧化作用的影响。结果表明：光处理后黄叶变绿，叶片中的ＬＯＸ活性降低，丙二醛含量和叶绿素含量增加，膜透性升高，ＩＵＦＡ升高。ＬＯＸ活性与光抑制过程的恢复，光保护过程及膜脂过氧化作用有关。光诱导产生的膜脂过氧化作用是一种“准膜脂过氧化作用”。

EFFECT OF LIGHT ON THE LOX ACTIVITY AND LIPID PEROXIDATION IN YOUNG WHEAT LEAVES

Light was used to treat the etiolated younng wheat seedlings. The results showed that afterthe treatment of Light,the etiolated leaf turned to green,the LOX activity in it decreased dramat-ically,meamwhile,the MDA content. chlorophyll content and the membrane permeability in-creased. The fatty acid composition also changed,ie. with the decrease of ralative content of satu-rated fatty acid(especially C_(16:0)),the unsaturated fatty acid(especially the C_(18:3))and IUFA in-creased.The LOX activity was closely related to the recovery from photo inhibition,photo protec-tion and Lipid peroxidation in young wheat leaves. The lipid peroxidation induced by light was aquasi-Lipib peroxidation which differ from the lipid peroxidation usurally mentioned.