摘要
对梭砂贝母(Fritillaria delavayi)种子的萌发特性进行研究。结果表明,梭砂贝母种子在浸种6 h后吸水率达到80%以上,不存在吸水障碍;种子浸提液显著抑制塔黄种子萌发,抑制物主要存在于胚乳中;常温层积处理能促进种胚后熟,经过冬季低温层积,次年4月完成胚形态后熟;胚发育完全后仍需低温层积处理才能萌发;15~20℃是种子萌发最适宜的温度。梭砂贝母种子休眠主要是由于胚发育不完全和种子中含有萌发抑制物导致,属于混合休眠类型;低温层积处理可有效打破种子休眠。
In this study,the seed germination characteristics of Fritillaria delavayi Franch were investigated.The rate of water absorption was more than 80% at 6 h after submerging in water.Seed extracts significantly inhibited the seed germination of Rheum nobile and germination inhibitors were mainly found in endosperm.Natural cold stratification could promote the growth of embryo.Seed did not germinate immediately after embryo growth was completed,and an additional cold stratification period was required to break dormancy completely.Once dormancy was broken,seeds germinated at a range of temperatures,but seed germination rate was the highest at 15~20 ℃.These results indicate that seeds of F.delavayi have a low-temperature requirement for embryo growth and an additional cold stratification period after completion of embryo growth was needed,exhibiting characteristics of complex morphophysiological dormancy.
出处
《福建林业科技》
2017年第2期77-81,共5页
Journal of Fujian Forestry Science and Technology
基金
云南省教育厅科学研究基金资助性项目(2016ZZX255)
云南林业职业技术学院科学研究项目(KY201503)
关键词
梭砂贝母
发芽抑制物
吸水率
种子休眠
形态后熟
Fritillaria delavayi
germination inhibitors
rate of water absorption
seed dormancy
embryo growth
