摘要
以北京地区4种苔草(矮苔草、披针苔草、青绿苔草和涝峪苔草)的种子为材料,通过低温层积处理,测定了层积不同时间种子发芽率、发芽指数及内源激素含量、可溶性糖和淀粉含量等指标,对苔草种子休眠的原因进行了探讨。结果表明,层积处理能够增加苔草的发芽率和发芽指数,使矮苔草和披针苔草种子的发芽率分别从34%和40%提高到84%和81%,青绿苔草和涝峪苔草种子发芽指数分别从7.88和2.86提高到18.15和5.20;内源ABA含量较高是导致苔草种子休眠的重要原因;可溶性糖含量与种子发芽指数存在正相关关系。
The effect of cold stratification on dormancy and germination of four Carex species seeds were studied.The germination percentage （GP）,germination index （GI）,endogenous hormone content,and soluble sugar and starch were measured to explore the causes of dormancy.Stratification treatment elevated GP and GI of the seeds.The GP of C.humilis var.nana and of C.lanceolata seeds increased from 34% to 84% and from 40% to 81%,respectively and the GI of C.breviculmi and C.giraldiana seeds increased from 7.88 to 18.15 and from 2.86 to 5.20,respectively.High levels of endogenous ABA content may be an important factor for Carex seed dormancy.Soluble sugar content positively correlated with GI.
出处
《草业学报》
CSCD
北大核心
2010年第3期117-123,共7页
Acta Prataculturae Sinica
基金
北京市农林科学院青年科研基金(200707)
北京市科技新星计划(2008B32)
国家科技支撑计划(2007BAD88B09-04)资助
关键词
苔草种子
休眠
萌发
内源激素
可溶性糖
Carex seed
dormancy
germination
endogenous hormone
soluble sugar
