In this paper, systematic study was conducted to explore the causes of seed dormancy in the Chinese tallowtree (Sapium sebiferum (Linn.) Roxb.) Other than the early reports, coats of the tallowtree seeds were found to have good water permeability, which suggested that seed coats were not the main cause that inhibited the seed germination Meanwhile, germination test indicated that invitro embryo of tallowtree seeds didnt undergo dormancy However, extracting solutions of the seed coat and endosperm could suppress seed germination significantly, which implied the existence of endogenesis germination inhibitory substances in the corresponding seed parts Based on these findings, we proposed that inhibitory substances could be the main reasons that caused tallowtree seeds dormancy The tests of breaking tallowtree seed dormancy showed that: dormancy of tallow tree seeds could not be broken by both treatment with concentrated H2SO4 and the cold stratification method However, by testing with different gibberellic acid solutions, dormancy could be overcome by soaking the seeds in 500 or 1 000 mg/L GA3 followed by 100(GA3) days stratification
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