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作 者 ：崔晓涛;杨玲;沈海龙*

期 刊 ：植物研究 2009年 29卷 6期 页码：701-707

关键词：新西伯利亚银白杨；干旱胁迫；

Keywords:Populus bachofenii×P.pyramidalis ROZ, drought stress, protective enzyme,

摘 要 ：以1年生新西伯利亚银白杨幼苗为试验材料，研究了不同干旱胁迫强度下新西伯利亚银白杨抗氧化系统的生理响应和幼苗生长状况。结果表明，在20%~95%土壤含水量范围内，随着干旱胁迫强度的增加，幼苗质膜透性升高，保护酶活性呈规律性变化；同时，幼苗生长受到的抑制作用加剧；恢复供水后，幼苗质膜透性和各保护酶活性均恢复到接近对照水平。因此认为，在土壤含水量在田间持水量的20%~95%，即绝对容积含水率11.5%~43.7%之间新西伯利亚银白杨具备良好的适应调节能力，其最适土壤容积含水率为27.6%~29.9%。

Abstract:Populus bachofenii×P.pyramidalis ROZ is a new fast-growing timber production and ornamental variety introduced from Russia. Its permeation of plasma membranes and the activity of protective enzymes were studied by taking 1 year old tissue-culture derived plants as test materials that were treated by different drought stress. The results illustrated that the permeation of plasma membranes of P.bachofenii×P.pyramidalis ROZ was increased under drought stress condition, its relative electric conductivity increased along with the decrease of soil moisture and the time prolong of drought stress. Meanwhile, the membrane permeability and the protective enzyme activities after restoration of water supply were restored to the level under normal condition. Therefore, P.bachofenii×P.pyramidalis ROZ had good ability to adapt to drought stress in case that field moisture content was 20%~95%(the absolute volume moisture content was 11.5%~43.7%), and the absolute optimum volume moisture content was 27.6%~29.9%.

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