PEG胁迫下5种牧草饲料作物种子萌发期的抗旱性研究  

Study on Drought Resistance of Five Kinds Forage and Crops During Seed Germination Period under PEG Stress

作　　者：刘贵河[1] 郭郁频[1] 任永霞[1] 曹春梅[1] 

机构地区：[1]河北北方学院牧业工程系,河北张家口075000

出　　处：《种子》2013年第1期15-19,共5页Seed

基　　金：校级课题资助(编号:2011015);公益性行业(农业)科研专项经费资助(编号:201203024)

摘　　要：以5种牧草饲料作物(草木樨、紫花苜蓿、鲁梅克斯、菊苣、高丹草)种子为材料,用不同浓度的PEG-6000(0、5%、10%、15%、20%、25%、30%)溶液模拟干旱胁迫,研究5种牧草饲料作物种子萌发期的相对发芽率、相对发芽指数、相对活力指数和抗旱指数4项指标。结果表明:PEG浓度对5种牧草饲料作物种子萌发有极显著影响(p<0.01),牧草种类间相对发芽率、相对发芽指数、相对活力指数有极显著性差异(p<0.01)。低浓度PEG(5%～15%)对鲁梅克斯、高丹草种子的萌发和高丹草抗旱指数有一定促进作用,随PEG-6000浓度的增加,种子萌发受抑制程度逐渐加剧,4项指标基本呈下降趋势;采用隶属函数法对干旱胁迫下5种牧草饲料作物种子萌发期抗旱性进行了综合评价,结果显示,5种牧草饲料作物在种子萌发期的抗旱性强弱为:高丹草>鲁梅克斯>紫花苜蓿>草木樨>菊苣。Five kinds of forage and crops （alfalfa, sweet clover, rumex K-l, chicory, Sorghum hybrid sudan- grass） seeds were selected as the materials in this paper, with different concentrations of PEG-6000 （0,5%, 10% ,15% ,20% ,25% and 30% ） simulated drought stress conditions, drought resistance of five kinds of forage and crops during seed germination was studied. The relative germination percentage, relative germination index, relative vigor index and drought index were determined. The results showed：It had significant influence among PEG concentrations for seeds germination（ p 〈 0.01 ）. There was significant difference among the five species about the relative germination percentage ,relative germination index ,relative vigor index （p 〈 0.01 ）. The low content PEG-6000 improved seed germination of Rumex K-l, Sorghum hybrid sudangrass, and Sorghum hybrid sudangrass of the drought resistance index, but with the concentration of PEG-6000 increased, the inhibitory also increased, four indexes decreased with increasing concentration of PEG-6000. The comprehensive evaluation of the five species by the membership function method indicated that the drought resistances decreased in the order was Sorghum hybrid sudangrass, Rumex K-1, Alfalfa, Sweet clover, Chicory.

关 键 词：PEG 抗旱性 种子萌发期 

分 类 号：S54[农业科学—作物学]