碱胁迫下外源硅对冰草种子萌发的影响  

Effects of Silicon on Agropyron Cristatum Seed Germination under Alkaline Stress

作　　者：孙娜 米福贵 闫士元 解颖 SUN Na;MI Fu-gui;YAN Shi-yuan;XIE Ying(College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Key laboratory of Grassland Resources,Ministry of Education,Hohhot 010011,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院草地资源教育部重点实验室

出　　处：《草学》2019年第6期45-52,共8页Journal of Grassland and Forage Science

基　　金：中欧政府间国际合作专项(2017YFE0111000)资助

摘　　要：以蒙农杂种冰草种子为材料,采用人工模拟碱(Na HCO3)胁迫,设10、30、60、90、120 mmol·L^-15个浓度作为碱处理,各浓度添加1. 0 mmol·L^-1Na2Si O3溶液作为碱+硅处理,研究碱胁迫下硅对冰草种子萌发的影响。结果显示,在不同浓度的碱胁迫下添加外源硅有助于提高冰草种子发芽势、发芽率、发芽指数、活力指数、胚根和胚芽生物量以及发芽整齐度(P<0. 05),明显缩短萌发时间,表明在碱胁迫下硅参与种子的萌发过程,在一定程度上降低渗透胁迫和离子毒害,增强冰草种子在碱胁迫下的抵抗力。In order to study effects of silicon on seed germination of Agropyron cristatum cv. Mengnong under alkaline stress,the seed performance under alkaline+sili con treatments including five alkaline( NaHCO3) evaluated. The results showed that Na2SiO3 treatment increased( P<0. 05) germination energy significantly,germination percentage,seed germination index,vigor index,biomass and significantly reduced( P<0. 05) germination time. The results preliminary explained that silicon involved in the germination under alkaline stress,reduced osmotic stress and ion toxicity and enhanced seed resistance.

关 键 词：蒙农杂种冰草 外源硅 萌发 碱胁迫 

分 类 号：S543.034[农业科学—作物学]