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Dissected white ash seeds were placed on a MS basal medium containing 10 μM TDZ and 1 μM 2,4-D. Adventitious buds formed directly and indirectly on cotyledons and hypocotyls that were in contact with the medium. Histological observations after 7 days from initiation indicated early divisional events originated directly in subepidermal layers on adaxial portions of the cotyledons. As these cells divided, the growth ruptured the epidermis. Bud-like structures were seen at 3 weeks. After transfer to a secondary medium containing 3 μM TDZ, 1 μM BA, and 1 μM IBA, some of adventitious buds elongated. Efforts (gibberellin, etiolation, ABA, and silver nitrate treatments) to increase the number of elongated buds have been unsuccessful. Excised adventitious shoots were rooted under mist and established in the greenhouse.

ADVENTITIOUS SHOOT ORGANOGENESIS IN WHITE ASH (FRAXINUS AMERICANA L.)