【作者】 孙宪芝； 郭先锋； 郑成淑； 王文莉； 梁芳；

【Author】 SUN Xian-zhi GUO Xian-feng ZHENG Cheng-shu WANG Wen-li LIANG Fang(College of Horticulture Science and Engineering,Shandong Agricultural University,State Key Laboratory of Crop Biology;College of Forestry,Shandong Asricultural University,Tai’an,271018)

【机构】 山东农业大学园艺科学与工程学院作物生物学国家重点实验室； 山东农业大学林学院；

【摘要】 以切花菊品种‘神马’为材料,研究了高温胁迫下外源Ca²⁺对菊花光合系统及活性氧清除酶系统的影响,探讨了Ca²⁺在高温下的作用及可能的作用机制。结果表明,高温胁迫下外源Ca²⁺抑制了净光合速率（Pn）、最大光能转化效率（Fv/Fm）、实际量子效率（ΦPSⅡ）的大幅度降低,并使初始荧光（Fo）维持在较低的水平;Ca²⁺明显激活了高温胁迫下叶片超氧物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）的活性,降低了高温胁迫下膜脂过氧化产物丙二醛（MDA）的积累与相对电导率（REC）的增加,缓解了短期高温胁迫对菊花光合系统的破坏。更多还原

【Abstract】 Cut flower chrysanthemum ’ Jinba’ was used to study effects of exogenous Ca²⁺ on photosynthetic system and activ- ities of the antioxidant enzymes under high temperature stress.The result showed that,under high temperature stress,additions of Ca²⁺ distinctly restrained the decrease of net photosynthesis rate （Pn）,photochemical efficiency of PSⅡ（Fv/Fm） and quantum yield of PSII electron transport （ΦPSⅡ）,and preserved lower initial fluorescence （Fo） compared to control.Ca²⁺ addition significantly enhanced the activities of SOD,POD and CAT.In conclusion,addition of Ca²⁺ efficiently protected chrysanthemum leaves against the damage in photosynthetic apparatus suffered from short high temperature stress,and the ac- tive oxygen was scavenged by the enhanced antioxidant enzymes,and thus the membrane lipid peroxidization was significantly alleviated indicated by REC and MDA accumulation.更多还原