渗透胁迫对玉米幼苗水分状况及生长的影响  

Effects of Osmotic Stress on Water Status and Growth of Maiz e Seedlings

作　　者：赵丽英[1] 邓西平[1] 山仑[1] 

机构地区：[1]西北农林科技大学

出　　处：《华北农学报》2003年第2期33-35,共3页Acta Agriculturae Boreali-Sinica

基　　金：国家重点基础研究发展规划专项经费资助 (G19990 1170 8)

摘　　要：在人工生长培养箱中 ,研究了PEG模拟干旱对秦单 4号和陕单 911两个玉米品种水分状况及生长的影响。结果表明 ,随着渗透胁迫的加强 ,叶片的RWC、水势、叶面积、根系长度以及干物质积累都降低 ,且抗旱性较强的秦单4号降低幅度低于抗旱性较弱的陕单 911,但根冠比增加。秦单 4号的叶片生长速率低于陕单 911的叶片生长速率 ,但根系生长速率却高于陕单 911,而且在渗透胁迫下秦单 4号可以很快做出适应性反应 ,陕单 911反应迟钝。The effects of osmotic stress with PEG 6000 on wate r s tatus and growth of maize seedlings,Qindan No.4 and Shandan 911, were studied b y water culture in artificial growth shelter. It is indicated that RWC, water potential, leaf ar ea, root system length and dry matter accumulation would be reduced with the inc rease of osmotic stress in experiment period. And the range of reduction of Qind an No.4(a drought resistant variety) is less than Shandan 911(a drought sensitiv e one). But R/S of them are all increased. The leaf expansion rate of Qindan No. 4 was lower than that of Shandan 911, but the root growth rate is greater. Moreo ver, Qindan No.4 would make quick adaptation response under osmotic stress, but Shandan 911 was slower.

关 键 词：渗透胁迫 玉米 幼苗 水分状况 生长 人工生长 培养箱 秦单4号品种 陕单9ll品种 

分 类 号：S513[农业科学—作物学]