摘要
概述了植物种子休眠的原因及种子休眠的多形性.种壳障碍、胚形态发育不全和生理后熟以及种子中含有化学抑制剂都可导致种子休眠.根据不同的分类标准可将种子休眠可分成不同类型,但通常将休眠分为外源休眠、内源休眠和综合休眠.影响休眠的因素是复杂的,植物种类不同,休眠特性不同;同种植物的种子,来源于不同居群和植株,在不同时期采集,位于母株不同位置,其休眠有可能不同;甚至同一果实中的不同种子,休眠特性都会有差异.影响休眠性状表达的基因既有核基因,又有质基因,休眠通常表现为一种受多基因控制的数量性状.种子休眠的多形性有利于调节种子萌发的时空分布.
Causes of seed dormancy and polymorphism of dormancy were summarized in this paper. Husk obstruction, morphological embryo hypoplasia, physiological afterripping, and chemical inhibitors in seeds all induced seeds to be dormant. According to various criterions,seed dormancy could be classified into various categories, but dormancy was generally classified into exogenous, endogenous, and combinational dormancy. Causes of dormancy were complicated, and the seeds of different plant species had different characteristics of dormancy. There was variation in seed dormancy among the seeds from the same species because of various populations and individuals, periods for collecting and locations of mother plants.Moreover, there was difference among the seeds from the same fruit. Seed dormancy were generally quantitative traits influenced by a large number of genes including nuclear gene and plasmagene. The seed dormancy polymorphism benefited regulating spatiotemporal distribution of seed germination.
出处
《西北植物学报》
CAS
CSCD
2003年第5期837-843,共7页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家重点基础研究发展规划项目 编号:G2000046803
广东省科技百项工程项目 编号:2KB06801S
中国科学院生物科学与技术研究特别支持费课题 鼎湖山南亚热带季风常绿阔叶林物种多样性的维持机制研究 STZ97-1-05
中国科学院知识创新工程项目资助 KSCX2-3-04-05
