Abstract:

Calystegia soldanella is an important plant growing in seashore with ornamental, medicinal and ecology protective value. The seed morphology and the seed dormancy characteristic of Calystegia soldanella were studied in this paper. The result was as follows: the seed of Calystegia soldanella was black, large, ovate and hard. The testa sculptures were irregular hexagonal mesh cell with compact wall observed by scanning electron microscope. The untreatment seeds absorbed little water and cannot germinate, low temperature stratification cannot break dormancy. The seeds treated with 98% sulfuric acid for 60 min germinated 94.9%, 50% treated by 100℃ hot water and 81.8% with fine sand friction. In conclusion, the dormancy of Calystegia soldanella seed was result of water impermeability of seed coat. The methods of improving water permeability can break seed dormancy. Soaking seeds with concentrated sulfuric acid for 60 minutes was the effective method to increase germination percentage. Abraded seed with fine sand was the environmental-friendly methods of break dormancy.