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试验表明，涝渍胁迫时三种美洲黑杨无性系叶片脱落酸（ＡＢＡ）、蛋白质以及基茎乙烯含量比对照有显著提高，而叶片玉米素核苷（ＺＲ）含量却明显低于对照，无性系之间的各性状表现存在一定差异。综合生长状况认为，ＡＢＡ、乙烯含量增加易导致叶片衰老、气孔关闭，但不是简单的生长抑制，它们可以促进不定根的形成，从而促使ＺＲ含量提高，这些特性对涝渍缺氧条件下，植物生存和生长尤为重要。研究表明，苗木抗涝能力大小与ＡＢＡ、乙烯、ＺＲ以及蛋白质等性状在涝渍胁迫下的反应敏感度，以及能否在较短的时间内得以恢复的能力有一定关系，反应早，恢复快，则苗木抗性强。比较三种杨树无性系生理性状及生长状况认为，Ｉ６９杨在涝胁迫下表现最好，Ｉ３５１杨在渍胁迫下，生长最佳。
The results showed that abscisic acid (ABA), protein content and ethylene content in stem and root of three clones of Populus tomentosa were significantly higher than those of the control, while the content of zeatin riboside (ZR) in leaves was significantly lower than that of the control There are some differences between the traits of the traits. According to the comprehensive growth status, the increase of ABA and ethylene content can lead to leaf senescence and stomatal closure, but it is not a simple growth inhibition. They can promote the formation of adventitious roots and thus promote the increase of ZR content. These characteristics are beneficial to the survival of plants under waterlogging and hypoxia conditions. And growth is particularly important. The results showed that the ability of waterlogging tolerance of seedlings was related to the response sensitivity under waterlogging stress, such as ABA, ethylene, ZR and protein, and the ability to recover in a short period of time. Early reaction and fast recovery , Seedling resistance is strong. Comparison of the physiological characteristics of three poplar clones and growth conditions that, I 69 Yang under the best performance under waterlogging stress, I 351 Yang under stain stress, the best growth.