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干旱胁迫对不同种源香椿主要叶绿素荧光参数的影响 预览 被引量:26

Effects of Drought Stress on Chlorophyll Fluorescence Parameters in Seedlings of Different Toona sinensis Provenances
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摘要 以江苏南京、四川广元、湖南洞口、湖北随州、河南西峡、陕西安康6个种源香椿苗木为材料进行盆栽试验,研究干旱胁迫对香椿苗木3个主要叶绿素荧光参数的影响。结果表明:6个种源香椿苗木不同荧光参数的变化趋势并不完全一致。在持续性胁迫期间,6个种源香椿叶片的Fv/Fm值下降幅度较小;恢复供水后,除湖南洞口和湖北随州种源外,其余4个种源几乎都恢复至正常供水的水平。随着胁迫的持续,光化学猝灭系数(qP)受影响程度加大;胁迫末期,除河南西峡和陕西安康2个种源外,其余4个种源的下降幅度均增大,且湖南洞口和湖北随州2个种源的下降幅度最大,恢复供水后几乎没有恢复,说明这2个种源叶片的光化学淬灭受胁迫的影响最大。非光化学淬灭系数(qN)在胁迫初期、胁迫末期(四川广元种源除外)和复水后(湖北随州种源除外)有不同程度的增大,避免了过剩光能对光合器官的伤害;但胁迫中期,6个种源呈现降低趋势。各种源3个主要荧光参数的动态变化与其抗旱性强弱等级一致。 An experiment was conducted to study the effects of drought stress on three main parameters of chlorophyll fluorescence in Toona sinensis potted seedlings from six provenances,including Nanjing of Jiangsu,Guangyuan of Sichuan,Dongkou of Hunan,Suizhou of Hubei,Xixia of Henan and Ankang of Shanxi. Results showed that the changing tendencies of the parameters were not completely identical. With the continuance of drought stress,the decreasing extent of Fv/Fm of T.sinensis leaves was very small for the six provenances. After rewatering,the other four provenances could almost recover to normal level except Dongkou of Hunan and Suizhou of Hubei. The photochemical quenching (qP) was heavily influenced by the prolonged drought stress. During the later stages of drought stress,the qP of Xixia of Henan and Ankang of Shanxi changed little,while the decreasing extent of qP of the other four provenances increased,especially for Dongkou of Hunan and Suizhou of Hubei provenances,but after rewatering,the two provenances could hardly recover. This indicated that the photochemical quenching of these two provenances was heavily influenced by drought stress. The non-photochemical quenching (qN) of all the six provenances increased to some extent in the initial and the later stages(except Guangyuan of Sichuan provenance) as well as after rewatering (except Suizhou of Hubei provenance),which could avoid the harm of excess light energy to photosynthetic organs. But in the middle stage of drought stress,the qN of the six provenances decreased. The dynamic changes of the three main chlorophyll fluorescence parameters of six T.sinensis provenances were consistent with the level of drought resistance.
作者 杨玉珍 陈刚 彭方仁 Yang Yuzhen,Chen Gang(Department of Life Sciences,Zhengzhou Normal College,Zhengzhou 450044,P. R. China); Peng Fangren(Nanjing Forestry University)
出处 《东北林业大学学报》 CAS CSCD 北大核心 2010年第7期 49-51,共3页 Journal of Northeast Forestry University
基金 国家自然科学基金项目(30872055) 河南省科技攻关项目(092102110095)
关键词 香椿 种源 干旱胁迫 叶绿素荧光参数 Toona sinensis Provenances Drought stress Chlorophyll fluorescence parameters
作者简介 杨玉珍,女,1965年11月生,郑州师范学院生命科学系,博士研究生。 通信作者:彭方仁,南京林业大学森林资源与环境学院,教授。
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