水分胁迫下白杨派双交无性系主要生理过程研究

以白杨双杂交杂种新无性系为主要试验材料，在４种水分胁迫条件下对各无性系生理和生长指标进行分析，结果表明，土壤干旱胁迫对无性系净光合速率，蒸腾速度，气孔导度，叶温与气温差，细胞间ＣＯ２浓度等生理指标均产生显著影响。不同指标对水分胁迫的敏感性不同，无性系间在各项生理指标值及随水分胁迫发展而下降幅度均存在着显著差异。

PHYSIOLOGICAL STUDY OF DOUBLE CROSS HYBRID CLONES OF WHITE POPLAR UNDER WATER STRESS

With the one year old seedlings of the double cross hybrid clones of white poplar as the experimental meaterials,the major physiological properties of the clones were analyzed under four water stress conditions.The result shows that under the condition of soil drought stress,photosynthesis ( Pn ),transpiration ( Tr ),stomatal conduces ( Gs ),intercellular CO 2 concentration ( Ci ),and difference of leaf temperature and air temperature ( Lt ) were all influenced significantly. The sensitivity of the factors to water deficit was different from each other,and significant physiological differences existed among the clones.The relation of Tr,Gs,Ci and Lt to Pn was studied by means of path analysis,multiple regression and partial correlation analysis.When the water was sufficient,the factor affecting Pn was Ci .With drought stress developing,the affecting of the four factors to Pn both not singificant. When the water content dropped to 40%,the factors affecting Pn were Gs and Ci .