干旱地区农业研究Issue(5)：96-100,5.DOI:10.7606/j.issn.1000-7601.2015.05.18
聚乙二醇模拟干旱对新疆橡胶草种子萌发与幼苗生长的影响
Effects of simulated drought stress by polyethylene glycol (PEG-6000)on seed germination and seedling growth of Taraxacum kok-saghyz Rodin (TKS)in Xinjiang
摘要
Abstract
Seeds of Taraxacum kok-saghyz Rodin (TKS) were employed as the experimental material in this paper , and the effects of simulated drought stress with different concentrations and osmotic potentials (-1 .0~0 .0 MPa ) by polyethylene glycol (PEG-6000 ) were investigated on seed germination potential ,seed germination rate ,seed daily ger-mination rate ,average seed germination rate ,germination index ,viability index ,radicle length ,germ length and germ width .The results showed that the variation trend of seed activity and seedling growth of TKS was firstly ascending and then gradually dropping with the levels and time of simulated drought stress by PEG increased .When osmotic potential of PEG reached -0 .4 MPa ,TKS seeds germination was promoted ,and their germination index and viability index were significantly higher than the CK group .However ,the differences in radicle length ,germ length and germ width tested in this research were not significant from the CK group ,indicating that the seed activity might be more sensitive to PEG-simulated drought stress than seedling growth .The seeds treated with -0 .8 MPa osmotic potential by PEG could not ger-minate at all ,suggesting that -0 .8 MPa osmotic potential was critical for the seed germination of TKS .关键词
橡胶草/干旱胁迫/种子萌发/聚乙二醇Key words
Taraxacumkok-saghyz Rodin/Drought stress/Seed germination/Polyethylene glycol分类
农业科技引用本文复制引用
徐建欣,杨洁,吴景,刘实忠..聚乙二醇模拟干旱对新疆橡胶草种子萌发与幼苗生长的影响[J].干旱地区农业研究,2015,(5):96-100,5.基金项目
中国热带农业科学院湛江实验站科研启动专项经费 （）
