应用生态学报2011，Vol.22Issue(5)：1147-1154,8.
短期UV-B辐射对青藏高原美丽风毛菊PS Ⅱ光化学效率的影响
Effects of short term enhanced UV-B radiation on the PS Ⅱ photochemical efficiency of alpine plant Saussurea superba
摘要
Abstract
A simulation experiment of short term supplementation of UV-B was conducted to study the changes of chlorophyll fluorescence coefficients of alpine plant Saussurea superba under three typical weather conditions ( sunny, cloudy, and shady) in Qinghai-Tibet Plateau. When the weather changed from sunny to shady, the maximal quantum efficiency of PS Ⅱ photochemistry ( Fv/Fm)after 3 minutes of dark adaptation increased significantly, the actual photochemical efficiency of Ps Ⅱ ( ΦpsⅡ ) and photochemical quenching (qp) also increased. but the non-photochemical quenching (NPQ) decreased. demonstrating that PAR was the main factor affecting the PSⅡ photochemical efficiency of S. superba. After the short term supplementation of UV-B. the Fv/Fm and NPQ under the three typical weather conditions had a slight decrease but the ΦPsⅡ and qp had a slight increase. while the photosynthetic gas exchange had less change. The increasing trend of net photosynthetic rate Pn and ΦPsⅡ under enhanced UV-B radiation could be related to the existence of more UV-A component. and also. benefited from the increased leaf thickness. UV-B radiation had potential negative effects on leaf photosynthetic components.关键词
美丽风毛菊/叶绿素荧光/PSⅡ光化学效率/青藏高原/UV-B辐射/天气分类
农业科技引用本文复制引用
师生波,尚艳霞,朱鹏锦,杨莉..短期UV-B辐射对青藏高原美丽风毛菊PS Ⅱ光化学效率的影响[J].应用生态学报,2011,22(5):1147-1154,8.基金项目
国家自然科学基金项目(30670307.30570270,30170154)和国际科技合作计划重点项目(2002CB714006)资助. （30670307.30570270,30170154）
