title: [Effects of NO3- stress and recovery on chlorophyll fluorescence parameters and Atpase activities of cucumber seedling leaves].
abstract: With water culture, this paper studied the effects of NO3- stress and recovery on the chlorophyll contents, chlorophyll fluorescence parameters, and ATPase activities of cucumber seedling leaves. The results showed that under stress for 7 days, the chlorophyll a, chlorophyll b, total chlorophyll and carotenoid contents, intrinsic fluorescence (Fo), and Mg-ATPase and Ca-ATPase activities were increased significantly when the NO3- concentration was high (168 mmol x L(-1)), while the intrinsic photochemical efficiency (Fv/Fm), potential activities (Fv/Fo) and quantum yield (phiPS II) of PSII were decreased with increasing NO3- concentration. After recovery for 7 days, the chlorophyll and carotenoid contents of all treatments with NO3- were lower than CK, while the intrinsic fluorescence, intrinsic photochemical efficiency and quantum yield of PS II were similar to CK when the NO3- concentration was < or = 84 mmol x L((-1), and the Fv/Fm and phiPS II were significantly lower than CK when the NO3-concentration was > 84 mmol x L(-1). The potential activity of PS II was similar to CK when the NO3- concentration was 42 and 126 mmol x L(-1), but significantly lower than CK in other treatments. The activities of Mg-ATPase and Ca-ATPase were decreased firstly but increased then when the NO3- concentration was > 84 mmol x L(-1).
authors.affiliation: College of Horticulture Science and Engineering, Shandong Agricultural Univeristy, Tai'an 271018, China. beautyyfj@163.com
authors.forename: Fengjuan
authors.initials: F
authors.lastname: Yang
authors.forename: Xiufeng
authors.initials: X
authors.lastname: Wang
authors.forename: Min
authors.initials: M
authors.lastname: Wei
authors.forename: Xiurong
authors.initials: X
authors.lastname: Su
authors.forename: Tong
authors.initials: T
authors.lastname: Yan
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D002734:Chlorophyll / Q000032:analysis*; D018553:Cucumis sativus / Q000378:metabolism*; D009566:Nitrates / Q000032:analysis*; D018515:Plant Leaves / Q000378:metabolism; D036226:Seedlings / Q000378:metabolism*
chemical_list: D009566:Nitrates; D002734:Chlorophyll; D000251:Adenosine Triphosphatases