Preliminary Study on The Dormancy Mechanism and Dormancy Breaking Methods in Phalaris arundinaceaSeeds

Seed dormancy of Phalaris arundinacea is one of the most important factors limiting culture and utilization.The seed dormancy mechanism was investigated by seed germination test,water absorption rate test and inner germination inhibitory substance test,treating seeds of P.arundinacea with hormones and KNO3 and organic solvent were carried out to find the best dormancy breaking method.The results showed that the reasons of seed dormancy were water absorption barrier by seed coat,physiological dormancy and germination inhibitors existing in seed.It is comprehensive dormancy for P.arundinacea.seeds,but germination inhibitors was the primary limit factor.Treatments of 100mg/L GA3,100mg/L 6BA,150mg/L KT and 4g/L KNO3 for 24hours improved the germination rate of P.arundinacea seeds significantly,but the best method was treating with 4g/L KNO3 for 24hours,average germination rate was 91%,increased by 137% compared with control,and the second method was treating with 100mg/L GA3 for 24hours,average germination rate was 84%,increased by 118% compared with control.