丁香属植物光合机构的热响应特征研究  

Responses of photosynthesis and heat-tolerance in seedling of four lilacs to high-temperature

作　　者：姚军朋[1,2] 陈莉[2] 崔洪霞[2] 姚拓[1] 

机构地区：[1]甘肃农业大学草业学院草业生态系统教育部重点实验室中-美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]中国科学院植物研究所,北京100093

出　　处：《草原与草坪》2010年第5期50-55,58,共7页Grassland and Turf

基　　金：国家自然科学基金(30570175);中国科学院知识创新工程植物园专项(KSCX2-YW-Z-059)资助

摘　　要：为研究植物迁地保育的引种适应机制,以丁香属广布种和狭域种4种代表种质为试验材料,研究了丁香属种间叶片光合气体交换、叶绿素荧光的热响应特征。结果显示,引种地旱季37℃高温使4种丁香净光合速率(Pn)呈不同变化趋势,气孔导度(Gs)和胞间CO2浓度(Ci)均呈上升趋势;与冷凉处理相比,适度高温下4种丁香叶片羧化效率(CE)不同程度下降,而蒸腾速率(Tr)与之相反;高温下,4种丁香光系统II(PSII)的激发能捕获效率(Fv′/Fm′)、光化学淬灭(qP)、实际光化学效率(ΦPSII)和电子传递速率(ETR)与净光合速率变化相一致。与紫丁香和暴马丁香相比,红丁香和羽叶丁香的非光化学淬灭(NPQ)均显著升高。综合分析表明:(1)在适度高温下,非气孔因素是丁香狭域种光合速率下降的主要原因;(2)较高的蒸腾速率和较强的光能利用效率可能是丁香广布种在适度高温下保持光合机构热稳定性的重要原因;(3)紫丁香、暴马丁香较耐热,羽叶丁香的耐热性最差。High temperature is one of the major abiotic factors that limited plant growth and development in many regions of the world.We investigated the effects of high temperature on leaf gas exchange and chlorophyll fluorescence,and heat-tolerance of the photosynthesis were synthetically evaluated by a fuzzy membership function in four seedlings of lilacs.The results showed that high temperature induced a decreased net photosynthetic rate to Syringa villosa and Syringa pinnatifolia,but increased to Syringa oblata and Syringa amurensis,which all the lilacs had distinct high stomatal conductance,transpiration and intercellular CO2 concentration.The carboxylation effciency of Syringa villosa and Syringa pinnatifolia were remarkable decreased compared to Syringa oblata and Syringa amurensis.Though the ФPSII,Fv′/Fm′,qP of high temperature treatment were significantly higher than cold ones,the NPQ were remarkably lower than S.oblata and S.amurensis.Therefore,non-stomatal factor is the main reason for discreasing of syringa photosynthetic rate;higher leaf transpiration rate and light utilization efficiency could help to enhance their photosynthetic capacity for S.oblata and S.amurensis;and S.oblata and S.amurensis were the most heat-tolerant germplasm among the tested Lilacs.

关 键 词：丁香 高温 光合作用 耐热性 

分 类 号：S685.26[农业科学—观赏园艺] Q945[农业科学—园艺学]