PEG胁迫对芒和荻种子萌发的影响  

Effects of different concentrations of polyethylene glycol on seeds germination of Miscanthus sinensis and Triarrhena sacchariflora

作　　者：何淼[1] 赵保成[1] 李强[1] 刘长乐[2] 

机构地区：[1]东北林业大学园林学院,黑龙江哈尔滨150040 [2]黑龙江省林业科学院,黑龙江哈尔滨150080

出　　处：《草业科学》2013年第4期577-582,共6页Pratacultural Science

基　　金：中央高校基本科研业务费专项资金项目(DL12CA11);黑龙江省青年基金项目(QC2009C52)

摘　　要：以PEG-6000为渗透介质模拟干旱胁迫,对芒(Miscanthus sinensis)和荻(Triarrhena sacchariflora)的种子萌发情况进行了研究。结果表明,低质量分数的PEG(10%)对芒和荻种子的发芽率没有明显的作用,但对芒种子的发芽指数、活力指数、胚根长度、胚根鲜质量以及荻种子胚芽长度有一定的促进作用;高质量分数的PEG,对芒和荻种子的发芽率、发芽指数、活力指数、胚根、胚芽长度以及鲜质量都有明显的抑制作用;荻种子的半致死PEG质量分数为15%,致死质量分数为20%,而芒种子的半致死质量分数为20%,致死质量分数高于20%;随着PEG质量分数的升高,芒和荻的萌发抗旱指数逐渐下降,芒在20%PEG处理时表现为不抗旱,而荻在15%PEG处理时已表现为不抗旱,综上所述,芒比荻更抗旱。Effects of different concentrations of polyethylene glycol（PEG） solution on seeds germination of Miscanthus sinensis and Triarrhena sacchariflora were studied.The results showed that the low concentration PEG（5%-10%） had no significant effects on the seed germination rate of M.sinensis and T.sacchariflora,but it increased the germination index,vigor index,radicle length and radicle fresh weight of M.sinensis and plumules growth of T.sacchariflora.However,high PEG concentration（15%-20%） inhibited growth of seedlings and reduced the germination rate,germination index,vigor index and radicles length/plumule length significantly（P0.05）.The half of lethal concentration of T.sacchariflora was 15% and the lethal concentration was 20%,while the half of lethal concentration of M.sinensis was 15% and the lethal concentration was higher.Thus,the drought resistance of M.sinensis was better than T.sacchariflora.

关 键 词：芒 荻 PEG胁迫 种子萌发 

分 类 号：S54[农业科学—作物学]