Abstract
The seeds of Apiaceae have been known as having morphophysiological dormancy (MPD). It is a class of seed dormancy in which the embryo is both underdeveloped and physiologically dormant. This study was conducted to investigate the effects of the temperature, light and chemical reagent on dormancy breaking and seed germination of three species in Apiaceae (Peucedanum japonicum Thumb, Angelica tenuissima Nakai, Glehnia littoralis F. Schmidt et Miq.). Seed size of three species ranged from 5.57-9.7 mm in length and 3.7 mm in width. The 1000-seed weight ranged from 0.21 g in A. tenuissima to 17.53 g in G. littoralis. Maximum percent-germinations of P. japonicum, A. tenuissima, and G. littoralis were 62.6%, 43.3%, and 36.4%, respectively. In P. japonicum and A. tenuissima, prechilling (4C for 7 days) were only best effective on breaking dormancy and germination. The GA3 or KNO3 treatments were ineffective for breaking dormancy. The proper temperature for germination was constant 20C. In G. littoralis, gibberellin treatments were effective for germination. The seeds showed relatively good germinations at alternative 15/20C (16/8h) and constant 20C (dark).
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