title: [Effects of exogenous Ca2+ on leaf photosynthetic apparatus and active oxygen scavenging enzyme system of chrysanthemum under high temperature stress].
abstract: Taking cut flower chrysanthemum 'Jinba' as test material, the effects of exogenous Ca2+ on its photosynthetic system and antioxidant enzyme activities under high temperature stress were investigated, with the possible action mechanisms of Ca2+ discussed. The results showed that under high temperature stress, Ca2+ addition greatly inhibited the net photosynthesis rate (P(n)) and quantum yield of PS II electron transport (phi(PS II)). After 24 h treatment, the P(n) and psi(PS II) were increased by 31.11% and 21.88% , respectively, and the initial fluorescence (F(o)) decreased by 13.19%, compare with the control. Ca2+ addition also greatly enhanced the activities of SOD, POD and CAT, and thus, the active oxygen was scavenged timely. After 24 h treatment, the MDA accumulation and REC were 29.20% and 35.81% lower than the control, respectively. In conclusion, Ca2+ addition could efficiently protect chrysanthemum leaves from the damage in photosynthetic apparatus under short-term high temperature stress.
authors.affiliation: State Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai' an 271018, Shandong, China. sunxianzhi@126.com
authors.forename: Xian-Zhi
authors.initials: XZ
authors.lastname: Sun
authors.forename: Xian-Feng
authors.initials: XF
authors.lastname: Guo
authors.forename: Cheng-Shu
authors.initials: CS
authors.lastname: Zheng
authors.forename: Wen-Li
authors.initials: WL
authors.lastname: Wang
authors.forename: Fang
authors.initials: F
authors.lastname: Liang
mesh_terms: D002118:Calcium / Q000494:pharmacology*; D002374:Catalase / Q000378:metabolism; D031202:Chrysanthemum / Q000201:enzymology / Q000502:physiology*; D006358:Hot Temperature; D009195:Peroxidase / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects* / Q000502:physiology; D018515:Plant Leaves / Q000201:enzymology / Q000502:physiology; D013482:Superoxide Dismutase / Q000378:metabolism*
chemical_list: D002374:Catalase; D009195:Peroxidase; D013482:Superoxide Dismutase; D002118:Calcium