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作 者 ：杨景宏, 陈拓, 王勋陵

期 刊 ：植物生态学报 2000年 24卷 1期 页码：102-105

关键词：小麦；紫外线B辐射；叶绿体膜系统；膜脂过；

Keywords:Wheat (Triticum aestivum L. ), Ultraviolet radiation-B, Chloroplast membrane system, Membrane peroxid,

摘 要 ：研究了温室种植的小麦在0kJ·m-2(对照)、8.82kJ·m-2(处理1)和12.6kJ·m-2(处理2)3种剂量的紫外线B辐射下叶绿体膜组分和膜流动性的变化。紫外线B辐射导致了光合色素(包括叶绿素和类胡萝卜素)的降解、Hill反应的抑制、膜脂肪酸组分配比的改变和不饱和度指数(IUFA)的下降、膜流动性的降低以及丙二醛(MDA)含量的升高。分析表明，紫外线B辐射诱导的膜脂过氧化是叶绿体膜系统受破坏的主要原因。

Abstract:Changes in chloroplast membrane composition and membrane fluidity in wheat leaves exposed to 0kJ·m-2 (CK), 8.82kJ·m-2 (T1) and 12.6kJ· m-2 (T2) were studied. Ultraviolet-B radiation induced the degradation of photosynthetic pigments (including chlorophyll and carotenoids),an increase in MDA content and change in the fatty acid composition of chloroplast membrane and a decrease in IUFA. Compared with a control treatment ,both the activity of the Hill reaction and the fluidity of chloroplast membranes were reduced by ultraviolet-B exposure. The analysis indicated that membrane peroxidation might be one of the causes of chloroplast membrane damage induced by ultraviolet-B radiation.

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