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.
出处
《华北农学报》
CSCD
北大核心
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
关键词
西葫芦
低温弱光
净光合速率
叶绿素荧光
Zucchini
Chilling under weak light
Net photosynthetic rate
Cholorophyll fluorescence
作者简介
刘栓桃(1969-),女,山西长治人,副研究员,硕士,主要从事蔬菜作物单倍体培养、生理生化及分子标记研究。
通讯作者:何启伟(1940-),男,山东济南人,研究员,博士生导师,主要从事蔬菜遗传育种、蔬菜分子生物学以及设施蔬菜栽培生理研究。