四种灌木幼苗对水分胁迫的生理响应  

Physiological responses of four shrub seedlings to water stress

作　　者：姚华[1] 赵晓英[1] 李晓梅[1] 赵法[1] 董正武[1] 

机构地区：[1]新疆师范大学生命科学与化学学院,乌鲁木齐830054

出　　处：《生态科学》2009年第6期537-542,共6页Ecological Science

基　　金：国家自然科学基金资助项目(3066035);新疆维吾尔自治区高校科研计划重点项目(XKEDU2007S26);新疆师范大学珍稀濒危物种保护生物学重点实验室;新疆师范大学干旱区湖泊环境与资源重点实验室

摘　　要：柠条锦鸡儿(Caragana korshinskii)、白皮锦鸡儿(C.leucophloea)、刺叶锦鸡儿(C.acanthophylla)和长枝木蓼(Atraphaxis virgata)是乌鲁木齐周边植被组成中的重要植物种,在植被恢复中具有潜在价值。研究通过人工控制水分比较这4种灌木对干旱胁迫的生理响应,结果表明:叶片的组织含水量和叶绿素含量随着干旱胁迫的加剧而降低;脯氨酸在干旱胁迫下的积累程度较可溶性糖大;除刺叶锦鸡儿外其它植物幼苗的丙二醛在干旱胁迫下均无明显的积累(P>0.05)。4种灌木在干旱胁迫下通过渗透调节、保持膜系统稳定等途径维持正常的生理活动,对干旱具有一定的适应能力。4种灌木抗旱能力的排序为白皮锦鸡儿>柠条锦鸡儿>长枝木蓼>刺叶锦鸡儿。Caragana korshinskii, C. leucophloea, C. acanthophylla and Atraphaxis virgata are four important species composed of vegetation around Urumqi, and they have a great potential in recovering degraded vegetation. In this study, physiological responses of four shrub seedlings to artificially simulated drought stress were studied. The results showed that leaf water content and chlorophyll content of four shrub seedlings decreased with increased drought stress. Proline accumulation was much more significant than soluble sugars under drought stress conditions. MDA accumulation was not significant （P〉0.05） for all shrub seedlings except C. acanthophylla. Our results indicated that four shrubs can adapt to add environments by adopting different strategies under drought stress conditions, and that drought resistance in descending order of four shrubs was C. leucophloe 〉 C. korshinskii 〉 A. virgata 〉 C. acanthophylla.

关 键 词：灌木 幼苗 干旱胁迫 渗透调节 丙二醛 叶绿素 

分 类 号：S792.99[农业科学—林木遗传育种]