Effects of Short-Term Chilling Stress on the Photosystems and Chloroplast Ultrastructure in Sweet Pepper

LI Xin-guo; BI Yu-ping; ZHAO Shi-jie; MENG Qing-wei; HE Qi-wei; ZOU Qi

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Effects of Short-Term Chilling Stress on the Photosystems and Chloroplast Ultrastructure in Sweet Pepper

机译：短期低温胁迫对甜椒光系统和叶绿体超微结构的影响

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By measuring chlorophyll fluorescence parameters, composition of fatty acids, active oxygen species and activities of some antioxidant enzymes, effects of chilling stress (4℃) in the low light (100 μmol m-2 s-1) on chilling-sensitive plants were studied. After 6 h chilling stress (4℃) in the low light, the maximal photochemical efficiency of PSⅡ (Fv/Fm) of sweet pepper leaves decreased by 35.6%, and the oxidizable P700 decreased by 60%. However, chilling stress in the dark had no effect on both of them. Unsaturation of fatty acids in thylakoid membrane was accelerated, which might be helpful to stabilize photosynthetic apparatus. Distortion and swelling of grana caused by chilling in the dark probably decreased activities of antioxidant enzymes, which resulted in the accumulation of active oxygen species. On the contrary,photooxidation might be related to the disintegration and unstacking of grana. Chilling stress induced photoinhibition of PSⅡ and PSⅠ, and active oxygen species might be one of the factors causing the decrease of the oxidizable P700. PSⅠseemed to be more sensitive to chilling stress in the low light than PSⅡ.

机译：通过测量叶绿素荧光参数，脂肪酸的组成，一些抗氧化酶的活性氧物种和活性，在低光（100μmolM-2S-1）上对冷冻敏感植物的冷却应力（4℃）的影响。在低光中冷却应力（4℃）后，甜椒叶片（FV / FM）的最大光化学效率降低了35.6％，可氧化P700降低了60％。然而，黑暗中的寒冷压力对它们的两个都没有影响。加速囊体膜中脂肪酸不饱和，这可能有助于稳定光合仪。在黑暗中冷却引起的Grana的畸变和肿胀可能会降低抗氧化酶的活性，导致活性氧物种的积累。相反，光氧化可能与崩解和难以粘连的关系。寒冷的应力诱导PSⅡ和PSⅠ的光抑制，活性氧物种可能是导致可氧化P700减少的因素之一。 PSⅠEEMEEMESEEMESEEMESEEMET比PSⅡ在低光中更敏感。

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《农业科学学报（英文版）》 |2005年第6期|429-435|共7页
作者
LI Xin-guo; BI Yu-ping; ZHAO Shi-jie; MENG Qing-wei; HE Qi-wei; ZOU Qi;
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作者单位

High-Tech Research Center, Shandong Academy of Agricultural Sciences, Jinan 250100, P.R. China;

Key Lab of Crop Biology of Shandong Province, Tai'an 271018, P.R. China;

High-Tech Research Center, Shandong Academy of Agricultural Sciences, Jinan 250100, P.R. China;

College of Life Sciences, Shandong Agricultural University, Tai'an 271018, P.R. China;

Key Lab of Crop Biology of Shandong Province, Tai'an 271018, P.R. China;

College of Life Sciences, Shandong Agricultural University, Tai'an 271018, P.R. China;

Key Lab of Crop Biology of Shandong Province, Tai'an 271018, P.R. China;

High-Tech Research Center, Shandong Academy of Agricultural Sciences, Jinan 250100, P.R. China;

College of Life Sciences, Shandong Agricultural University, Tai'an 271018, P.R. China;

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原文格式 PDF
正文语种 chi
中图分类农作物;
关键词
Sweet pepper; Chilling stress in the low light; Ultrastructure; Composition of fatty acids; Active oxygen species;

机译：甜椒;弱光下的低温胁迫;超微结构;脂肪酸组成;活性氧;

Effects of Short-Term Chilling Stress on the Photosystems and Chloroplast Ultrastructure in Sweet Pepper

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