赤峰36号杨幼苗对水分协迫的生理响应  

Physiological response of Populus chifengensis No. 36seedling to water stress

作　　者：冯子娟 

机构地区：[1]喀喇沁左翼蒙古族自治县林业局,辽宁朝阳122300

出　　处：《吉林林业科技》2014年第5期5-6,22,共3页Journal of Jilin Forestry Science and Technology

摘　　要：以赤峰36号杨1 a生幼苗为材料,采用渗透胁迫处理的方法,研究杨树幼苗生理指标对水分不同强度胁迫的响应,结果表明:在3种水分强度胁迫下,杨树幼苗各生理指响应不同,当PEG体积分数为10%时,苗木水势和POD活性较对照变化明显,但MDA含量和质膜相对透性变化不显著,说明该强度的水分协迫未对杨树幼苗造成生理伤害;当PEG质量分数为15%时,虽然MDA含量较对照变化不显著,但苗木水势、POD活性和质膜相对透性却发生了显著变化,尤以质膜相对透性变化明显,说明该强度的水分协迫已对细胞造成了伤害;当PEG质量分数达到20%时,4种生理指标较对照均出现显著变化,说明该强度的水分胁迫对幼苗造成了严重伤害。Populus chifengensis No.36 1-year-old seedlings were taken as materials to research the response of seedling physiological indexes to different levels of water stress .Results indicated that response of seedling physiological indexes were different under three levels of water stress .When volume fraction of PEG was 10%, seedling water potential and PEG activity significantly varied compared with control , whereas MDA content and relative plasma membrane permeability did not, suggesting that water stress did not cause physiology injure to the seedlings .When volume fraction of PEG was 15%, MDA content was not significantly changed compared with control , but water potential , PEG activity and relative plasma membrane permeability were significantly varied , showing that water stress had caused injure to the cells .When volume fraction of PEG reached 20%, four physiological indexes were all significantly varied compared with control , showing water stress had caused grievous injury to the seedlings .

关 键 词：赤峰36号杨 水分胁迫 1 a生幼苗 生理响应 

分 类 号：Q945.78[生物学—植物学]