PEG胁迫对三种豆科牧草种子萌发及幼苗生理影响  

Effect of PEG stress on seed germination and seeding physiology of three Legumes

作　　者：余如刚[1] 杜雪玲[1] 陈楚[1] 周秀杰[1] 史刚荣[1] 

机构地区：[1]淮北师范大学生命科学学院资源植物学安徽省重点实验室,安徽淮北235000

出　　处：《干旱地区农业研究》2012年第5期99-103,共5页Agricultural Research in the Arid Areas

基　　金：2009年度安徽省高校自然科学研究项目(KJ2009B088)

摘　　要：本实验采用聚乙二醇(PEG-6000)模拟干旱,研究了不同干旱胁迫对三种多年生豆科牧草(白三叶、红豆草、紫花苜蓿)种子萌发与幼苗生理影响。结果表明:随着PEG浓度的升高,三种豆科牧草种子发芽率、发芽指数和叶片相对含水量都呈下降趋势;白三叶种子的发芽势在PEG浓度为10%时出现拐点。不同PEG胁迫下白三叶发芽率最高,紫花苜蓿较低;红豆草叶片相对含水量较高,且下降趋势平缓。随着PEG浓度胁迫加剧,白三叶和红豆草叶片SOD活性先升后降,紫花苜蓿叶片SOD活性先降后升;白三叶和红豆草叶片POD活性呈现"Z"变化;三种豆科牧草CAT和根系活力总体呈先升后降趋势,且红豆草CAT活性和根系活力最高。The seed germination and seeding physiology of three legumes （white clover, sainfoin, lucerne） were re searched under artificial drought stress using different concentrations of polyethylene glycol （PEG 6000）. The results showed that the germination rate （GR）, germination index（GI） and relative water concent （RWC） of three legumes de creased with the increase of the drought stress, but the germination potential （GP） of seeds of white clover had a inflection point at 10% PEG. With different PEG concentrations, GR of white clover was the highest and GR of lucerne was lower. The RWC of sainfoin was higher than others legumes. SOD activity of white clover and sainfoin first increased and then decreased as drought stress increased, but the lucerne had an opposite change. POD activity of white clover and sainfoin presented a ＂Z＂ tendency. CAT and root activity of three legumes increased and then decreased, and the root vigor of sainfoin was higer than the other two legumes.

关 键 词：豆科牧草 PEG胁迫 种子萌发 生理指标 

分 类 号：S332.1[农业科学—作物遗传育种]