【摘要】 在不同灌水条件下,对盆栽柿幼树叶片组织相对含水量,细胞透性,超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性,膜脂脂肪酸组分和脂质过氧化作用产物——丙二醛(MDA)含量进行测定,结果表明:当水势Ψ_S下降时,细胞透性(PERM)增大,SOD和CAT活性下降,脂质过氧化作用增强,膜脂中不饱和脂肪酸含量下降,饱和脂肪酸含量升高。试验证明:土壤水势(?)_S=-3.80±0.47bar,各指标变化最明显。本试验条件下,幼柿叶片SOD活性,CAT活性,MDA含量,PERM,不饱和脂肪酸指数(IUFA)与组织相对含水量(RWC)和土壤水势(Ψ_s)间具显著相关关系。更多还原

【Abstract】 The relative water content (RWC), cell permeability (PERM); the acti-vities of superoxide dismutase (SOD) and catalase (CAT), the malondialde-hyde (MDA) content produced by lipid peroxidation, and the components offatty acid in membrane lipid of potted persimmon tree leaves were measuredunder different water conditions. The results indicated that as the soil waterpotential (ψ_S) decreased, cell permeability (PERM) increased, the activities of SODand CAT decreased, lipid perxidatin increased, the content of unsaturated fattyacid in membrane lipid reduced, while the saturated fatty acid content raised.It was proved that the changes in all indexes were most obvious as soil wa-ter potential ψ_S =-3.80±0.47bar. There were significant correlations betwe-en SOD activity, CAT activity, MDA content, PERM, index of unsaturatedfatty acid (IUFA) and leaf tissue relative water content (RWC), as well assoil water potential (ψ_S) under the present experimental conditions for youngpersimmon tree.更多还原