干旱胁迫对3种禾本科牧草种子萌发及幼苗生长的影响  

Effects of Drought Stress on Seed Germination and Growth of Three Kinds of Gramineae Forage

作　　者：顾涛 包赛很那 韩有健 苗彦军[1] GU Tao;BAO Saihenna;HAN Youjian;MIAO Yanjun(Xizang Agricultural and Animal Husbandry University,Linzhi Xizang 860000,China)

机构地区：[1]西藏农牧学院,西藏林芝860000

出　　处：《种子》2024年第12期123-127,共5页Seed

基　　金：中国农业大学-西藏农牧学院科研联合基金项目(2024TC082);中央引导地方科技发展资金项目,巴青垂穗披碱草种子繁育生产体系研究与示范(ZYYD2023000147);国家自然科学基金项目“EnCOR401基因调控垂穗披碱草耐低温机制研究”(32260342)。

摘　　要：为了解中华羊茅、披碱草和无芒雀麦等3种禾本科牧草种子萌发期的抗旱性,本试验采用PEG-6000模拟干旱条件,设计5%、10%、15%共3个浓度作渗透介质,研究不同干旱胁迫强度对3种牧草种子萌发及幼苗生长的影响。结果表明,中华羊茅种子萌发生长指标随PEG-6000浓度的增加呈降低趋势,在5%PEG-6000溶液处理时,其发芽势、活力指数、胚根长及干重均高于对照;无芒雀麦除了幼苗干重以外,其余的种子萌发生长指标均随处理浓度的增加而降低,其中在5%PEG-6000溶液时,其种子萌发生长指标均高于对照,表现为低促高抑效应。在不同胁迫条件下,披碱草各项指标高于其余两种牧草,中华羊茅种子发芽率、发芽势和发芽指数均高于无芒雀麦。研究表明,在3种牧草中,披碱草耐旱性最强,中华羊茅次之,无芒雀麦对轻度干旱具有耐受性。In order to understand the drought resistance of three grasses,including Festuca sinensis Keng ex E.B.Alexeev,Elymus dahuricus Turcz.and Bromus inermis Leyss.,PEG-6000 was used to simulate drought conditions,and three concentrations of 5%,10%and 15%were designed as permeating medium to study the effects of different drought stress intensity on seed germination and seedling growth of the three kinds of forages.The results showed that the germination growth index of Festuca sinensis Keng ex E.B.Alexeev seeds decreased with the increase of PEG-6000 concentration,of which the germination potential,vigor index,radicle length and dry weight of Festuca sinensis Keng ex E.B.Alexeev seeds were higher than those of control in 5%PEG-6000 solution.Except for the dry weight of seedlings,the seed germination and growth indexes of Bromus inermis Leyss.decreased with the increase of treatment concentration,and the seed germination and growth indexes of 5%PEG-6000 solution were higher than the control,showing a low promotion and high inhibition effect.Under different stress conditions,the seed germination rate,germination potential and germination index of Elymus dahuricus Turcz.were higher than the other two.The results showed that the drought tolerance of Elymus dahuricus Turcz.was strongest among the three forage species,followed by the Festuca sinensis Keng ex E.B.Alexeev,and the Bromus inermis Leyss.had the tolerance to mild drought.

关 键 词：干旱胁迫 中华羊茅 披碱草 无芒雀麦 

分 类 号：S543[农业科学—作物学]