Study on Dormancy Mechanism and Dormancy-breaking Method of Velvetleaf(Abutilon theophrasti)Seeds

摘要

[Objectives]This study was conducted to explore how can we better break the dormancy of velvetleaf seeds and the best method to promote seed germination.[Methods]With the seeds of velvetleaf(Abutilon theophrasti)as experimental materials,the dormancy of velvetleaf seeds was revealed through seed vigor determination,water absorption rate determination and germination tests,and the seeds of velvetleaf were treated by physical and chemical methods to explore the best method for breaking dormancy of velvetleaf seeds.[Results]Poor water permeability of seed coat and endogenous inhibitory substances present in the seeds were the main reasons leading to the dormancy of velvetleaf seeds.The shell-breaking treatment,98%concentrated sulfuric acid treatment and 40%NaOH strong alkali treatment all could break the dormancy obstacle of velvetleaf seed coat.Compositing the above measures with 200 mg/ml gibberellin solution could further improve the germination ability of seeds.Among them,compositing the mechanical shell-breaking treatment with gibberellin had the best effect,followed by the composite of 10 and 15 min of 98%concentrated sulfuric acid treatment with gibberellin.[Conclusions]This study lays a foundation for the utilization and development and the comprehensive prevention and control research of velvetleaf seeds.