川西北高寒草地3种禾草种子萌发期抗旱性  

Drought resistance evaluation of three grass species at germination stage from the Northwest Plateau of Sichuan Province

作　　者：余方玲[1,2] 杨满业[1] 干友民[2] 杨树晶[2] 肖冰雪[1] 郑群英[1] 张洪轩[1] 

机构地区：[1]四川省草原科学研究院,四川成都611731 [2]四川农业大学草业科学系,四川雅安625014

出　　处：《草业科学》2011年第6期993-997,共5页Pratacultural Science

基　　金：国家牧草产业技术体系(CARS-35)

摘　　要：为研究川西北高寒草地牧草种子萌发期的抗旱性,选用川西北高寒草地当地的3种牧草——‘阿坝’硬秆仲彬草(Kengyilia rigidula‘Aba’)、川草2号老芒麦(Elymus sibiricuscv.‘chuancao No.2’)和垂穗披碱草(Ely-mus nutans)为研究对象,用0、50、100、150和200 g/L的聚乙二醇(PEG-6000)溶液模拟干旱胁迫。采用隶属函数法对各材料的相对发芽率、相对发芽势、相对发芽指数、相对活力、抗旱指数进行抗旱性综合评价。结果显示,50g/L的PEG-6000有利于种子的萌发;相对发芽指数、抗旱指数为鉴定川西北高寒草地3种牧草种子萌发期抗旱性的较好指标;抗旱性强弱依次为硬秆仲彬草>垂穗披碱草>川草2号老芒麦。To determine the drought resistance of grass species at germination stage,seeds germination of three grass species（Kengyili rigidula cv.＇Aba＇,Elymus sibiricus cv.＇chuancao No.2＇ and Elymus nutans） which collected at Northwest Plateau of Sichuan Province,were tested under PEG-6000 solution with different concentration of 0,50,100,150,200 g/L.The relative germination rate,relative germination potential,relative germination index,relative vigor index and drought resistance index were synthetically evaluated by applying membership function method.The results showed： 5% concentration of PEG-6000 favored seed germination;relative germination index and drought index were better indicators for drought resistance identification of three kinds of grass species at germination stage;the drought resistance ability for studied species sequenced as K.rigidula E.nutans E.sibiricus cv.＇chuancao No.2＇.

关 键 词：PEG-6000 '阿坝’硬秆仲彬草 川草2号老芒麦 垂穗披碱草 种子萌发期 抗旱性 

分 类 号：S54[农业科学—作物学]