摘要
以种子生活力、种子萌发率和离体胚萌发率为测定指标,通过外种皮、内种皮和胚乳内含物的生物测定,及种皮和胚乳内源激素的测定,对松属6个树种种子休眠原因进行研究.结果表明:6个树种种子胚均不休眠;外种皮所含的萌发抑制物对种子休眠起主要作用,胚乳所含的萌发抑制物或内种皮起次要作用;种皮和胚乳所含ABA类物质是引起种子休眠的主要抑制剂,高ABA含量和低GA3含量是导致6个树种种子休眠的主要原因,且ABA/GA3比值的大小与种子休眠程度的深浅存在着正相关关系.
Based on the tests of the embryo viability, germination rates of whole seeds and the isolated embryos, the causes of seed dormancy of 6 species in genus of Pinus were studied by testing the biological function of the abstracts from the testa, endothelium and endosperm, and by the contents of endogenous hormones of the seed coats and endosperms of these different species. The results showed- Embryo itself of all the 6 species did not show dormancy. The inhibitors contained in the outer coats played the leading role in causing the seed dormancy, the inhibitors contained in the endosperm and endothelium were the secondary reasons to cause dorman- cy. ABA and its related chemicals contained in episperm and endosperm were the predominant inhibitors causing seed dormancy, and the higher ABA content and lower GA3 content were the main causes to the seed dormancy, the ratio of ABA/GA3 had positive relations to the extent of seed dormancy.
出处
《西南林学院学报》
2008年第2期5-9,共5页
Journal of Southwest Forestry College
基金
国家自然科学基金资助项目(39470580)
关键词
松树
种子休眠
休眠原因
pine tree species
seed dormancy
causes of seed dormancy
