不同生育期美丽风毛菊PSⅡ光化学效率和色素含量对UV-B辐射的响应

摘要/Abstract

摘要： 以高山植物美丽风毛菊为材料,在矮嵩草草甸植物群落生长季的不同月份,采用短期滤除太阳辐射光谱中UV-B成分的方法,研究了UV-B辐射对PSⅡ光化学效率、光合色素和紫外吸收物质的影响。结果表明,1)与对照相比,low UV-B处理时3 min暗适应的PSⅡ最大光化学量子效率F_v/F_m呈升高的趋势,说明UV-B辐射能加剧PSⅡ反应中心的可逆失活或损伤程度。2)PSⅡ实际光化学效率Φ_PSⅡ和光化学猝灭系数qP在生长季内具有基本一致的变化趋势;low UV-B处理能引起Φ_PSⅡ和qP的升高和NPQ的降低,表明自然光谱中的UV-B成分能降低叶片的光能捕获效率,促进非光化学能量耗散过程。3)low UV-B处理时光合色素的降低与叶片变薄有关,强太阳UV-B辐射下光合色素的相对增加是一种表象。综上可知,青藏高原强太阳UV-B辐射对高山植物的光合生理过程具有潜在的负影响,叶片中高含量且相对稳定的UV-B吸收物质可有效屏蔽太阳UV-B光量子抵达光合机构等敏感部位,不同生育期叶片PSⅡ光化学效率的差异与环境因子和叶片发育状态有关。

Abstract: A UV-B-exclusion study was performed in alpine Kobresia humilis meadow during plants growing season. The PSⅡ photochemistry efficiency, photosynthetic pigments and UV-B-absorbing compounds were measured on native alpine plant Saussurea superba. 1) The 3 min dark adapted quantum efficiency of PSⅡ photochemistry, F_v/F_m, showed an increasing trend after a short-term removal UV-B radiation from natural sunlight in all measurements. These means there were photo-inactivation and/or photo-damage of photosynthesis occurred in PSⅡ reaction center. 2)There were same tendency in PSⅡ photochemistry efficiency Φ_PSⅡ and photochemical quenching qP for all measurements during plants growing season; The Φ_PSⅡ and qP were increased and NPQ decreased after removal UV-B treatment, which means that there was an increasing in PSⅡ photochemistry efficiency and a decreasing in non-photochemical quenching and current solar UV-B intensity can impair photosynthetic function. 3)The reduction of photosynthetic pigments contents were mainly caused by the reducing of leaf thickness and relative increase of photosynthetic pigments contents in amb UV-B treatment a specious phenomenon. In summary, strong solar UV-B radiation in Qinghai-Tibet region has a potential negative influence on photosynthetic physiology process in S. superba. UV-B-absorbing compounds were not influenced during the short-term removal of UV-B radiation, mainly due to strong stabilization of these compounds existed in the epidermal layer of the alpine plant S. superba and can provide effective defense against the natural solar UV-B intensity.

中图分类号:

Q945.11

丁伟,尚艳霞,师瑞,师生波. 不同生育期美丽风毛菊PSⅡ光化学效率和色素含量对UV-B辐射的响应[J]. 草业学报, 2012, 21(3): 198-205.

DING Wei, SHANG Yan-xia, SHI Rui, SHI Sheng-bo. Response of PSⅡ photochemistry efficiency and photosynthetic pigments during exposure of
alpine plants Saussurea superba to natural UV-B radiation[J]. Acta Prataculturae Sinica, 2012, 21(3): 198-205.

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