【摘要】 对烟草的不定根、茎外韧皮部、花蕾及上、中、下三个部位叶片的超氧物歧化酶(SOD)、脂氧合酶(Lox)活性及蛋白质、丙二醛(MDA)含量进行了分析比较.发现花蕾的SOD活性最高,而Lox活性及MDA含量最低.不同部位叶片之间相比,以进入衰老期的下部叶SOD活性和蛋白质含量最低,而MDA含量最高.更多还原

【Abstract】 Physiological characteristics of different organs including adventitious root, stem phloem .flower bud and leaves at different stalk positions of tobacco were comparatively studied. Among the organs tested the flower bud had the highest activity of superoxide dismutase and the lowest activity of lipoxygenase and content of malondialdehyde. Among leaves at various stalk positions, the leaf at lower stalk position, which had senesced, had the lowest activity of superoxide dismutase,content of protein and the highest content of malondialdehyde.更多还原