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以3年生枳砧兴津温州蜜柑盆栽苗为试材,研究高温处理对柑桔幼果细胞膜脂过氧化作用和内原乙烯水平的影响,及其与幼果脱落的关系,以探讨柑桔高温热害的生理机制.结果表明:高温处理使SOD活性下降,MDA含量增加;膜脂脂肪酸组分中亚麻酸比例减少,硬脂城比例上升;致使股脂不饱和脂肪酸指数下降;加速了内原乙烯合成;加剧了幼果脱落.细胞膜脂脂质过氧化产物MDA含量与不饱和脂肪酸指数呈极显著负相关(r=-0.8407),而与幼果累积落果率呈极显著正相关(r=0.8707).细胞膜脂过氧化作用加剧可能是高温热害加速幼果脱落的初始反应.
The effects of high temperature treatment on the membrane lipid peroxidation and endogenous ethylene level in young Citrus reticulata L. and its relationship with the shedding of young fruit were studied with 3-year-old Poncirus trifoliata plants grown on the leaves of Citrus unshiu zhengjin, The results showed that: high temperature treatment decreased SOD activity and increased MDA content; the ratio of linolenic acid in the fatty acid component decreased and the proportion of stearic acid increased; the unsaturated fatty acid index decreased; the endoethylene synthesis accelerated (R = -0.8407), but there was a significant positive correlation (r = 0.8707) between the content of malondialdehyde (MDA) and unsaturated fatty acid index Increased cell membrane lipid peroxidation may be the initial reaction to accelerate the shedding of young fruit under high temperature heat damage.