高温胁迫对希蒙得木幼苗叶片光合生理特性的影响  

Effects of High-temperature Stress on Physiological Characteristics of Seedling Leafin Simmondsia chinensis

作　　者：张念念[1] 黄溦溦[1] 胡庭兴[1] 李晓清[2] 尹丽[1] 刘文婷[1] 

机构地区：[1]四川农业大学林学院,四川省林业生态工程重点实验室,四川雅安625014 [2]四川省林业科学研究院,成都610081

出　　处：《四川农业大学学报》2011年第3期311-316,333,共7页Journal of Sichuan Agricultural University

基　　金：国家林业局“948”引进项目(20000404);四川省青年基金项目(09ZQ026-057);四川省重点学科建设项目(SZD2008)

摘　　要：在人工气候室内采用盆栽土培的方法,研究了不同程度高温胁迫对希蒙得木幼苗叶片光合作用和相关生理指标的影响。结果表明,对照(CK)叶片净光合速率(Pn)日变化呈"双峰"型,高温处理后叶片净光合速率日变化呈"单峰"型,T1和T2处理比CK同一时间峰值分别下降了17.4%和35.5%。T1和T2处理叶片的蒸腾速率(Tr)显著降低,气孔导度(Gs)日变化均随高温胁迫强度的加剧而极显著下降,高温胁迫使叶片胞间CO2浓度(Ci)升高,说明高温胁迫下希蒙得木幼苗叶片光合能力降低主要是受非气孔因素限制。此外,高温胁迫下的希蒙得木幼苗叶片相对含水量(LRWC)和叶绿素含量(Chl)显著降低;叶片相对电导率、丙二醛含量(MDA)、超氧化物歧化酶活性(SOD)、过氧化物酶活性(POD)、脯氨酸含量(Pro)和可溶性糖含量均随高温胁迫强度的加剧而显著升高。试验表明希蒙得木具有较高的耐热能力。Using phytotron to simulate high temperature environment,the study was made on the physiological characteristics of leaves of S.chinensis under different degree of high-temperature stress（CK,T1,T2） were studied.The results showed that diurnal change of net photosynthetic rate（Pn） of CK was double peak type,but those under T1 and T2 were single-peak type and they decreased by 17.4% and 35.5% respectively than CK.With the intensification of the stress temperature,transpiration rate（Tr） and stomata conductance（Gs） decreased significantly,while the intercellular CO2 concentration（Ci） increased.It showed that the decrease of Pn wasn＇t mainly stomata factor.Moreover,the leaf relative water content（LRWC） decreased significantly.The content of chlorophyll（Chl）,relative conductivity,the content of malondialdehyde（MDA）,the activity of peroxidase（POD） and superoxide dismutase（SOD）,Proline（Pro） and soluble sugar increased significantly with the intensification of the stress temperature.The research indicated that S.chinensis had a good high-temperature resistance capability.

关 键 词：希蒙得木 高温胁迫 光合 生理特性 

分 类 号：Q948.112.2[生物学—植物学]