干旱胁迫及复水对狼尾草幼苗生理特性的影响  

Effect of drought stress and rewatering on physiological characteristics of Pennisetum alopecuroides seedlings

作　　者：崔婷茹 于慧敏[1] 李会彬[1] 边秀举[1] 王丽宏[1] 

机构地区：[1]河北农业大学农学院河北省作物生长调控实验室,河北保定071001 [2]沽源气象局,河北张家口076550

出　　处：《草业科学》2017年第4期788-793,共6页Pratacultural Science

基　　金：河北省教育厅项目(QN2014200);河北农业大学作物学科梯队建设基金(TD2016C310)

摘　　要：本研究以狼尾草(Pennisetum alopecuroides)新品系LS-1为试验材料,研究在土壤干旱胁迫及复水条件下叶片相对含水量(RWC)、根冠比(R/S)、超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性、脯氨酸含量、可溶性糖含量的变化情况,探讨干旱胁迫对狼尾草生物学特性、叶片保护酶活性和渗透调节物质的影响,为优良抗旱品种选育提供理论依据。结果表明,随着土壤干旱胁迫时间的延长,狼尾草幼苗叶片相对含水量减小,根冠比增大,SOD和POD活性在土壤含水量降到5%时显著增强(P<0.05),脯氨酸和可溶性糖含量显著增加。复水后,狼尾草叶片各项生理指标均表现出不同程度的恢复。本研究表明,干旱胁迫可以促进狼尾草根系保护酶活性和渗透调节物质含量提高,对其应用于干旱地区园林绿化、生态修复具有重要价值。To investigate the physiological mechanisms of drought adaptation and protective enzyme system of Pennisetum alopecuroides under drought stress, we took the new strain of P. alopecuroides, LS-1, as the test materials, and analysed the differences in the physiological characteristics, including relative water content in leaf, root/shoot ratios, superoxide dismutase （SOD） activities, peroxidase （POD） activities, free proline contents and soluble sugar contents under drought stress and rewatering conditions. The results showed that with increasing stress due to soil drought, the relative water content of leaf decreased, but the root/shoot ratios, SOD, and POD activities in 5% soil water content, free proline contents, and soluble sugar content all increased significantly （P〈0.05）. After rewatering, the physiological characteristics of P. alopecuroides leaf recovered to different levels. Physiological mechanisms and protective enzyme system of P. alopecuroides offers the plant protection when under increased stress from drought. This is beneficial for the development of this species in drought areas.

关 键 词：狼尾草 干旱胁迫 保护酶 渗透调节 SOD POD 脯氨酸 

分 类 号：S543.9[农业科学—作物学]