Seed Dormancy and Germination in Endangered Plant Dysosm aversipellis(Hance) M. Cheng

Seed of Dysosm aversipellis has the physiological characteristic of long dormancy and lowgermination in natural conditions. In order to investigate the characteristic of dormancy and find the mechanismof dormancy and the optimal method for breaking the dormancy of D. aversipellis seed, some methods such asisolated embryo cultures, soaking seed in GA3, and cold stratification was utilized. The results showed that seedcoat and endosperm restriction, D. aversipellis after-ripping were principal reasons which caused dormancy.Soaking the seed in 400 mg/L GA3 solution for 24 h or cold stratification for 150 d could break the dormancy.The optimal method was 6-7℃ stratification for 150 d, after this treatment, the germination percentage andpower reached 88.5% and 30.4% respectively.