低温弱光对两个西葫芦品种幼苗光合速率及叶绿素荧光参数的影响  

Effect of Chilling Stress under Weak Light on Photosynthetic Rate and Chlorophyll Fluorescence Parameters in Two Zucchini Seedling

作　　者：刘栓桃[1] 董艳敏[1,2] 卢亚楠[1,3] 卢金东[1] 何启伟[1] 

机构地区：[1]山东省农业科学院蔬菜研究所,国家蔬菜改良中心山东分中心,山东省设施蔬菜生物学重点实验室,山东济南250100 [2]首都师范大学生命科学学院,北京100037 [3]四川农业大学,四川雅安625014

出　　处：《华北农学报》2009年第2期139-143,共5页Acta Agriculturae Boreali-Sinica

基　　金：山东省农业科学院青年基金(2005YQ003);山东省自然科学基金(Q2006D11);山东省农业科学院高技术自主创新基金(2006YCX014;2006YCX040);山东省良种产业化工程

摘　　要：以西葫芦进口品种元帅和地方品种X6-4为试材,研究了12℃低温和140μmol/(m2.s)弱光同时处理对二者幼苗叶片净光合速率(Pn)及叶绿素荧光参数的影响。结果表明:低温弱光使两品种西葫芦幼苗Pn显著下降,元帅Pn的下降幅度较小,并在恢复生长12 d后基本恢复至对照水平;低温弱光胁迫条件下,两品种最大光化学效率Fv/Fm、有效光化学效率Yield、光化学淬灭系数qP及非光化学淬灭系数qN均有不同程度的下降,其中元帅的各项参数下降幅度较小且在恢复生长12 d后各参数均能恢复或接近对照水平。说明12℃低温140μmol/(m2.s)弱光条件下,元帅PSⅡ反应中心所受的伤害轻,反应中心进行光合作用的能力较高。The effects of chilling stress（ 12 ℃ ）combined with weak light（ 140 μmol/（m^2· s））were investigated on net photosynthetic rate（Pn）and chlorophyll fluorescence parameters in leaves of two Zucchini seedlings, YAGUAR and X6-4. The results showed that the Pn of the two Zucchini varieties was decreased significantly after chilling and weak light stress, with YAGUAR＇s Pn decreasing to a less extent than X6-4＇s. At the same time, maximal photosynthetic efficiency （Fv/Fm）, practical photosynthetic efficiency（Yield）,photochemical quenching（qP） and non photochemical quenching （qN）were all declined to a greater extent in leaves of X6-4 than that of YAGUAR after treatment. Almost all the deter- mined indices could restore completely to the level of control in YAGUAR after they came back to controled condition for 12 d,while they couldn＇t in X6-4.The results indicated that 12℃ of low temperatrue combined with 140μmol/（m^2· S） low illumination caused less harmful to photosynthetic center of PS Ⅱ in leaves of YAGUAR than in those of X6-4.

关 键 词：西葫芦 低温弱光 净光合速率 叶绿素荧光 

分 类 号：S642.6[农业科学—蔬菜学]