大麦种子萌发期对渗透胁迫的响应及抗旱性鉴定指标的筛选  

The response of barley to osmotic stress during germination stage and the screening of drought resistance indicators

作　　者：鞠乐[1] 齐军仓[1] 贺雪[1] 王丹[1] 侯忠庆[1] 付强[1] 熊显鹏[1] 

机构地区：[1]石河子大学农学院,新疆石河子832003

出　　处：《干旱地区农业研究》2013年第1期172-176,共5页Agricultural Research in the Arid Areas

基　　金：现代农业产业技术体系建设专项资金资助(CARS-05);兵团动植物新品种选育科技攻关专项(2011BA002);石河子大学科学技术研究发展计划"动植物育种专项"(gxjs2011-yz05)

摘　　要：选用4份大麦材料,采用0%、5%、10%、15%、20%(W/V)PEG8000溶液模拟干旱胁迫处理,研究大麦种子萌发期发芽势、发芽率、根冠比、物质转运速率等形态生长发育指标对渗透胁迫的响应,进行抗旱性评价,筛选抗旱性鉴定指标。结果表明,随着渗透胁迫程度的增大,对大麦种子萌发产生显著的抑制作用,各指标对渗透胁迫的响应并不一致;20%PEG8000是较适宜的抗旱性鉴定浓度;初步推断胚根长、胚芽长、胚芽干重、物质转运速率可以作为大麦种子萌发期快速、有效的抗旱性鉴定指标;参试品种抗旱性强弱依次为Z027S078T、Z182U038V、Z037P017Q-1、Z039P046Q。The response of the index of germination potential, germination rate, the ratio of root-shoot, dry matter translocation rate to osmotic stress of four barley genotypes was studied with adoption of 0%, 5%, 10%, 15%, 20% （W/V） PEGS000 solution as drought stress treatment and the drought resistance and screening index of drought resis- tance of four barley genotypes were evaluated in this paper. The results showed that, along with the increase of osmotic stress, the inhibitory effect on seed germination was significant; the response of index to water stress was conflicting; the suitable PEGS000 concentration for drought resistance identification was 20% ; the length of radicle, the length of germ, the dry weight of germ and dry matter translocation rate could be used as effective and fast indicators for drought resis- tance of barley during germination stage; the drought-resistant ability of four genotypes was as as follows： Z027S078T, Z182U038V, Z037P017Q- 1 and Z039P046Q.

关 键 词：大麦 萌发期 渗透胁迫 抗旱性 形态指标 

分 类 号：S512.301[农业科学—作物学]