PEG模拟干旱胁迫对6种燕麦品种种子萌发的影响  

Effects of PEG simulated drought stress on seed germination of six oat cultivars

作　　者：柏晓玲[1] 周青平[2] 陈仕勇[1] 陈有军[2] 田莉华[2] 肖雪君[1] 

机构地区：[1]西南民族大学生命科学与技术学院,四川成都610041 [2]西南民族大学青藏高原研究院,四川成都610041

出　　处：《西南民族大学学报（自然科学版）》2015年第2期133-137,共5页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：西南民族大学研究生"创新型科研项目"(CX2014SP267);四川省教育厅创新团队项目(14TD0049)资助

摘　　要：研究了模拟干旱胁迫对6个燕麦品种种子萌发的影响,对旱作农区燕麦的引种栽培具有理论指导意义.试验以6个燕麦品种(青引3号莜麦、林纳、青引1号、青燕1号、青海444及青海甜燕麦)为研究材料,设计了0、5、10、15和20%的聚乙二醇(PEG-6000)溶液模拟不同干旱胁迫环境,分别测定了干旱胁迫下的发芽率、发芽势、胚根长度、胚芽长度、胚根与胚芽的比值、发芽指数及种子萌发抗旱指数.结果表明:低浓度(5%)PEG胁迫下可促进6个燕麦品种种子的萌发,PEG浓度在5-15%时,6个品种种子的萌发率均呈先升高后下降的趋势;在高浓度溶液(20%)渗透下,各燕麦品种萌发受抑制加强,且表现出明显差异性.6个燕麦品种的萌发抗旱性由高到低依次为:青引3号莜麦﹥林纳﹥青引1号﹥青燕1号﹥青海444﹥青海甜燕麦.青引3号莜麦更适宜于干旱地区种植,青海甜燕麦则不适宜在旱地种植.In order to study the effects of drought stress on seed germination of six oat cuhivars, five concentrations of polyethylene glycol （PEG-6000）including 0,5,10,15,20% were used to simulate different drought conditions. Under the five different concentrations, the indexes including seed germination rate, germination potential, radicle length, germ length, the ratio of radicle length and germ length, germination index and germination drought index were measured. The results showed that the low concentration of PEG （less than 5 % ）could stimulate all seeds germination. At the medium level（5-15 % ）, seed germination rates of six oat cuhivars increased at first and then decreased. Under the high concentration of PEG（20 % ）, the germination situa- tions of six cultivars were inhibited to some extent, which showed significant differences among cuhivars. According to the com- prehensive performances,the drought tolerances at germination stage of six oat cultivars were as follows：Qingyin No. 3 naked oat 〉 Linna 〉 Qingyin No. 1 〉 Qingyan No. 1 〉 Qing hai No. 444 〉 Qinghai sweet oat, which could be useful guides for introduction and cultivation of oats in dry farming area.

关 键 词：燕麦 聚乙二醇 干旱胁迫 种子萌发 

分 类 号：S54[农业科学—作物学]