水杨酸对高温胁迫下半夏叶片光合作用及叶绿素荧光的影响  被引量:8

Effects of Salicylic Acid on Photosynthesis and Chlorophyll Fluorescence in Pinellia ternata Leaves under High Temperature

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作  者:薛建平[1,2] 王兴[1,3] 张爱民[1] 常莉[1] 

机构地区:[1]淮北煤炭师范学院生命科学学院,安徽淮北235000 [2]资源植物生物学安徽省重点实验室,安徽淮北235000 [3]中国农业大学资源与环境学院,北京100094

出  处:《中国药学杂志》2008年第24期1855-1858,共4页Chinese Pharmaceutical Journal

基  金:国家农业成果转化资金重点项目(05EFN213400124);淮北市重大专项(06085)

摘  要:目的在大田气温高于30℃条件下,研究不同浓度的外源水杨酸对半夏光合作用和叶绿素荧光的影响。方法待半夏植株高约15cm左右时,对半夏喷施不同浓度的sA溶液,3次后测定半夏叶片的叶绿素含量、光合指标和叶绿素荧光指标。结果与对照相比,用0.1~1mmol·L^-1水杨酸处理叶片,提高叶绿素含量和叶绿素a/b比值;提高半夏叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、原初光能转换效率(Fv/Fm)、光合电子传递量子效率(ФPSⅡ)、最大荧光(Fm)和光化学猝灭系数(qP),降低胞间CO2浓度(Ci、初始荧光(Fo)及非光化学猝灭(NPQ)系数。结论SA对高温胁迫下半夏叶片光合机构具有保护作用,以喷施SA浓度为0.5mmol·L^-1的效果最佳。OBJECTIVE To investigate the effects of different concentrations of exogenous salicylic acid on photosynthesis and chlorophyll fluorescence in PineUia ternata under daejeon temperature above 30 ℃. METHODS SA of different concentration was sprayed to the plant as it grew about 15 cm high. Then the chlorophyll content, the photosynthetic indicators and chlorophyll fluorescence indicators were measured after 3 times spray. RESULTS 0. 1 - 1 mmol · L^-1 SA pretreatment increased chlorophyll contents, the ratio of chlorophyll a to b, the net photosynthetic rate (Pn), transpiration rate ( Tr ), stomatal conductance ( Cs ), photochemical efficiency ( Fv/Fm ), quantum yield of PS Ⅱ ( ФPS Ⅱ ), maximum fluorescence value ( Fm ) and photochemical quenching (qP), but inhibited intercellular CO2 concentration (Ci, initial fluorescence value (Fo ) and nonphotochemical quenching (NPQ). CONCLUSION SA shows a protective role against the photosynthetic system under high temperature stress. Comparatively, lower concentration of SA (0. 5 mmol· L^-1 ) was the most efficient.

关 键 词:半夏 水杨酸 光合作用 叶绿素荧光 

分 类 号:R282.2[医药卫生—中药学]

 

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