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当前位置: 首页 > 文章 > NaHSO_3对UV-B辐射增强下菠菜幼苗光合作用的影响 园艺学报 2009,36 (3) 369-376
Position: Home > Articles > Effects of NaHSO_3 on Photosynthesis in Spinach Seedlings Under Enhanced UV-B Radiation Acta Horticulturae Sinica 2009,36 (3) 369-376

NaHSO_3对UV-B辐射增强下菠菜幼苗光合作用的影响

作  者：
马红群;洪鸿;周忆堂;胡丽涛;梁丽娇;吴能表
单  位：
三峡库区生态环境教育部重点实验室;西南大学生命科学学院
关键词：
菠菜;NaHSO_3;UV-B辐射;光合速率;Hill反应;叶绿素荧光
摘  要：
研究了NaHSO3对不同强度UV-B辐射下菠菜幼苗光合速率、Hill反应速率、叶片色素含量以及叶绿素荧光参数的影响。结果表明,UV-B辐射降低了叶片光合色素含量、净光合速率(Pn)、原初光能转化效率(Fv/Fm)、光化学猝灭系数(qP)、非光化学猝灭系数(qN)、实际光化学效率(ΦPSⅡ)及Hill反应速率;提高了叶绿素a与b(Chl.a/b)和类胡萝卜素与叶绿素(Car./Chl.)的比值;在UV-B辐射胁迫和NaHSO3复合作用下,NaHSO3降低了重度UV-B辐射胁迫下上述指标的变化幅度,而轻度UV-B辐射胁迫下变化无显著差异。分析认为,随着UV-B辐射胁迫剂量的累积,NaHSO3的正效应可以减轻UV-B辐射对菠菜的负效应。复合处理下叶片Chl.a含量、Hill反应速率、原初光能转化效率(Fv/Fm)及ΦPSⅡ的升高是NaHSO3提高UV-B胁迫下Pn的内在原因。
译  名：
Effects of NaHSO_3 on Photosynthesis in Spinach Seedlings Under Enhanced UV-B Radiation
作  者：
MA Hong-qun,HONG Hong,ZHOU Yi-tang,HU Li-tao,LIANG Li-jiao,and WU Neng-biao(Key Laboratory of Eco-environments in Three Gorges Reservoir Region,Ministry of Education,School of Life Science,Southwest China University,Chongqing 400715,China)
关键词：
spinach;NaHSO_3;UV-B radiation;photosynthetic rate;Hill reaction;chlorophyll fluorescence
摘  要：
Effects of NaHSO3 on the changes of photosynthetic rate,Hill reaction rate,pigment content and the parameters of chlorophyll fluorescence under enhanced UV-B radiation were investigated in spinach leaves.The results were as follows:The content of pigment,net photosynthetic rate,conversion efficiency of primary light energy(Fv/Fm)of PSⅡ,the photochemical quenching coefficient(qP),the non-photochemical quenching coefficient(qN),the quantum yield of PSⅡelectron transport(ΦPSⅡ)and the Hill reaction rate were decreased while Chl.a/b,Car./Chl.were enhanced by UV-B stress.Under the combined treatment of enhanced UV-B radiation and NaHSO3,NaHSO3 could significantly alleviate the inhibition of high dosage UV-B treatment while improved little at low dosage UV-B radiation on the indexes above.It was suggested that the positive effects of NaHSO3 could lighten the negative effects of UV-B radiation treatment as UV-B radiation became intensified.It is a primary reason of net photosynthetic rate enhancing that the Chl.a content,Hill reaction rate,Fv/Fm and ΦPSⅡ were increased by combined treatment.

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