干旱胁迫下4个苜蓿品种根系抗旱性的比较  

Comparison on the root drought resistance of four alfalfa cultivars under drought stress

作　　者：朱新强[1] 张新颖 师尚礼[1] 南丽丽[1] 何成洋[1] 

机构地区：[1]甘肃农业大学草业学院,草业生态系统教育部重点实验室,中美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]全国贫困地区干部培训中心兰州分院,甘肃兰州730000

出　　处：《甘肃农业大学学报》2012年第1期103-107,共5页Journal of Gansu Agricultural University

基　　金：国家科技部项目(2007BAD52B06,2006BAD01A19);农业部行业专项(nyhyzx07-022);现代农业产业技术体系建设专项奖金资助;科技支撑计划(2008BADB3B07)

摘　　要：为明确苜蓿根系生理特性的变化与抗旱性的关系,采用盆栽断水的方式模拟土壤干旱胁迫,测定苗期根系相对含水率(RWC)、脯氨酸(Pro)含量、可溶性糖(TSS)含量、超氧化物歧化酶(SOD)活性和丙二醛(MDA)含量.结果表明:随着干旱胁迫程度增加,4个苜蓿品种根系RWC明显下降,Pro、TSS、MDA含量及SOD活性明显上升.经抗旱隶属度分析,‘野生黄花苜蓿’的综合评价值最高,为0.561 8,4种材料的抗旱性强弱顺序为:野生‘黄花苜蓿’>‘陇东苜蓿’>‘清水紫花苜蓿’>‘甘农2号’杂花苜蓿.In order to clarify the internal relationship between drought resistant capability and the change of physiological characteristics of alfalfa root,pot culture and water control were used to imitate drought stress in soil,and the relative moisture content,proline content,soluble sugar content,SOD activity and MDA content of roots in seedling period of four alfalfa cultivars were determined.The results indicated that the relative moisture content of alfalfa roots decreased significantly with the increasing of drought stress,whereas SOD activity,proline content,soluble sugar content and MDA content increased significantly.According to the drought resistant analysis of membership,＇native Medicago falcata＇ had the highest comprehensive evaluation value of 0.561 8,the drought resistant capabilities of 4 cultivars were in the sequence of ＇native Medicago falcata＇＇Medicago sativa cv.Longdong＇＇Medicago sativa cv.Qingshui＇＇Medicago varia cv.Gannong No.2＇.

关 键 词：苜蓿 干旱胁迫 生理指标 抗旱性 

分 类 号：S541[农业科学—作物学]