PEG引发对燕麦老化种子萌发与幼苗生长的影响  

Effects of PEG priming on germination and seedlings growth of accelerated ageing oat seeds

作　　者：夏方山[1] 闫慧芳[1] 毛培胜[1] 王明亚[1] 郑慧敏[1] 陈泉竹 

机构地区：[1]中国农业大学动物科技学院草业科学北京市重点实验室,北京100193

出　　处：《草业科学》2015年第5期731-737,共7页Pratacultural Science

基　　金：现代牧草产业技术体系(CARS-35)

摘　　要：试验以45℃老化48d的超干燕麦(Avena sativa)种子(含水量4%)为材料,通过不同渗透势PEG-6000(0、-0.3、-0.6、-0.9和-1.2 MPa)引发0(CK)、3、6和12h,然后分析其发芽率、幼苗根长、芽长、根鲜重及芽鲜重的变化,以探讨PEG引发对燕麦老化种子萌发及幼苗生长的影响。结果表明,高渗透势PEG(0和-0.3 MPa)可显著降低燕麦老化种子的发芽率(P<0.05),而低渗透势PEG(-0.9和-1.2 MPa)则显著提高了其发芽率(P<0.05),PEG引发显著促进了燕麦老化种子幼苗根的生长(P<0.05)。然而,PEG引发后燕麦老化种子幼苗根和芽的鲜重,以及芽长均显著下降(P<0.05)。PEG的渗透势、引发时间以及两者之间的交互作用均影响燕麦老化种子的萌发及幼苗生长。因此,在农业生产中,老化后的超干燕麦种子如何应用PEG引发还需要进一步研究探讨。In order to determine the effects of polyethylene glycol(PEG)priming on the germination and seedlings growth of ultra-dried oat seeds,the present study measured the indices including germination percentage,lengths of roots and shoots,weights of roots and shoots of ultra-dried(4% moisture content)oat(Avena sativa)seeds which were accelerated ageing for 48 dat 45℃and primed with different concentrations of polyethylene glycol(PEG)solutions(0,-0.3,-0.6,-0.9and-1.2MPa)for 0,3,6and12 h.The results showed that the germination percentage of aged oat seeds significantly decreased(P<0.05)after priming at high osmotic potential of PEG(0and-0.3 MPa)whereas significantly increased(P<0.05)after priming at low osmotic potential(-0.9and-1.2MPa).The length of roots increased significantly(P<0.05)but the length of shoots,and the fresh weights of roots and shoots significantly decreased(P<0.05)after PEG priming.These results indicated that the effects of PEG priming on the germination and seedlings growth of ultra-dried oat seeds were closely related with its osmotic potential,priming time and their interactions which suggests the further research about how to prime ultra-dried oat seeds after ageing with PEG in agricultural production need to be conducted.

关 键 词：聚乙二醇 种子老化 燕麦 萌发 幼苗生长 

分 类 号：S512.6[农业科学—作物学] Q945.34[生物学—植物学]