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当前位置: 首页 > 文章 > 黄瓜幼苗光合及荧光特性对弱光的响应 园艺学报 2008,35 (1) 119-122
Position: Home > Articles > Effects of Low Light on Photosynthetic and Fluorescent Characteristics of Seedlings of Cucumis sativus Acta Horticulturae Sinica 2008,35 (1) 119-122

黄瓜幼苗光合及荧光特性对弱光的响应

作  者：
李伟;黄金丽;眭晓蕾;王绍辉;关秋竹;周明;胡丽萍;张振贤
单  位：
中国农业科学院农业环境与可持续发展研究所;北京农学院植物科学技术系;中国农业大学农学与生物技术学院
关键词：
黄瓜;幼苗;弱光;气体交换;叶绿素a荧光
摘  要：
以不耐弱光的‘津研2号’和较耐弱光的‘戴多星’黄瓜(Cucumis sativus L.)为试材,在人工气候室内研究其光合及荧光特性对弱光(75～85μmol·m~(-2)·s~(-1))的响应。结果表明,弱光处理后叶片光合色素含量、总叶绿素/类胡萝卜素比值呈增加趋势,尤其是戴多星更明显;叶绿素a/b比值呈减小趋势,且戴多星的减小幅度大于津研2号;净光合速率、水分利用效率呈下降趋势,戴多星下降幅度小于津研2号;叶片最大光化学效率、光系统Ⅱ实际光化学效率、光化学反应速率、光系统非环式电子传递速率、光系统Ⅱ吸收光能用于光化学反应的比例,对弱光的响应有一定差异,弱光下戴多星均有明显增加,而津研2号的增减不规律,且幅度均较小,说明弱光下戴多星对弱光的利用能力明显强于津研2号。
译  名：
Effects of Low Light on Photosynthetic and Fluorescent Characteristics of Seedlings of Cucumis sativus
作  者：
LI Wei~1 HUANG Jin-li~2 SUI Xiao-lei~1 WANG Shao-hui~3 GUAN Qiu-zhu~1 ZHOU Ming~1 HU Li-ping~1 ZHANG Zhen-xian~(1*) (1 College of Agronomy and Biotechnology,China Agricultural University,Beijing 100094,China;2 Institute of Agricultural Environment and Sustainable Development,Chinese Academy of Agricultural Sciences,Beijing 100081,China;3 Department of Plant Science and Technology,Beijing Agricultural College,Beijing 102206,China)
关键词：
Cucumis sativus;;seedling;;low light;;gas exchange;;chlorophyll a fluorescence
摘  要：
The effects of low light on photosynthetic and fluorescent characteristics of seedlings of Cucu- mis sativus (shade susceptible‘Jinyan 2’and shade tolerant‘Dehastar’) were investigated in the growth chamber.After 20 days of treatment under low light intensity(75-85mol·m~(-2)·s~(-1)),the photosynthesis pigment contents and the ratios of chlorophylls/carotenoids[Chl.(a+b)/Car.] in leaves of the two culti- vars increased,and the values were higher in‘Deltastar’than in‘Jinyan 2’.While,the ratios of Chl.a/b decreased,especially in‘Deltastar’.The net photosynthesis rate(Pn) and water use efficiency in the two eultivars decreased but the smaller reduction extents and higher values were observed in‘Deltastar’.There were some differences in effects of low light on the maximal photochemical efficiency of PSⅡin the dark (Fv/ Fm),the actual photochemical efficiency of PSⅡin the light(ΦPSⅡ),the photochemical reaction rate (Prate),the linear whole-chain electron transport rate and the partitioning proportion for photochemical reac- tion of light energy absorbed by PSⅡbetween the two cuhivars,which increased markedly in‘Dehastar’, while less changes were obsearved in‘Jinyan 2’.It indicated that light energy use capability in‘Deltastar’was stronger than that in‘Jinyan 2’under low light.

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