Study On Factors Of Water Dropwort Seeds' Germination And Dormancy Physiology

This paper concentrates on seed dormancy and its breaking of water dropwort,using the method of harvest experiment,testing the permeability of the seed,distilling stayer and testing,germination trial,testing respiration,testing the vigor of enayme and measuring hormone content in different stratification,.The sexual propagation system was preliminary established and provided a feasible approach for protecting and developing the resources of water dropwort.The results as follows:1.The harvest part,harvest date and the way of torrefaction are attributed to the germination ratio.The seeds of first anthotaxy beat high germination ability.When the seeds became yellow is the best time to harvest,because it can guarantee not only quality but also output.2.The permeability of water and air of water dropwort seed coat is better,and it has no effect on seed dormancy.Biology test indicates that some growth inhibitors in the seeds are the main reason for seed dormancy.3.The optimum environmental condition is:20℃+2500 lx light intensity+24h illumination4.Stratification does its work to break dormancy among different trials,the next is KNO₃,The best way to break dormancy is:stratification 20 days+0.05%H₂O₂+20℃.In this method the germination ratio can reach 83.33%.5.Stratification plays an important role in the germination of the seeds.It can promote the respiratory of seeds,especially after 25 days.6.Amylase vigor and lipase vigor change small after breaking dormancy,but doesn't the vigor of POD,it can promote PPP way.7.Dynamic change of plant hormone during seed stratification,GA,IAA and KT content rise rapidly,but t decline gradually.After 25 days stratification,the content of ABA is not detected and the germination ratio of seeds is above of 70%.