Seed dormancy and germination in Oenanthe stolonifera as affected by temperature and gibberellic acid

다국어 초록 (Multilingual Abstract)

Our aim was to investigate the dormancy type of water dropwort seeds for developing seed germination methods in thefuture. The mature fruit is a schizocarp with sponge-like and thickened ribs. However, the seeds were able to absorb moisturenormally. In this study, less than 14% of seeds germinated without any pretreatment after 4 weeks at 20, 25, or 25/15 °C(12/12 h). However, there was a further increase in germination percentage after 10 weeks of incubation at 5/5, 15/6, 20/10,and 25/15 °C. The seeds germinated at higher ratios under relatively colder temperature regimes. Embryo growth in theseeds occurred at both warm and cold temperatures. However, water dropwort seeds require a period of cold temperatures forembryo growth to be completed. The germination percentage was signifi cantly higher in GA 3 -treated seeds, even though theabsolute diff erence was relatively low. In water dropwort, GA can overcome seed dormancy but cold temperature alone for8–10 weeks may eff ectively break seed dormancy and increase germination percentage. Based on these results, we proposethat most water dropwort seeds showed intermediate complex morphophysiological dormancy and some seeds had morphologicaldormancy at the time of dispersal. These results provide useful information for seed propagation and a practicalproduction plan for cultivation of water dropwort.

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