Abstract:

Abstract: In this paper, a protocol for efficient shoot regeneration was successfully developed from hypocotyl explants of Euonymus fortunei var. radicans. Some factors that influenced shoot regeneration such as different combinations of plant growth regulators, types of medium and inoculation ways were studied in order to establish an efficient plant regeneration for transformation. The results showed that hypocotyl explants were horizontally cultured on a basic medium composed of MS medium supplemented with 0.5 mg•L^-1 BAP and 0.01 mg•L^-1 NAA for induction and development of adventitious shoots. Ninety-four percent of regeneration frequency and 5.1 shoots per explants were obtained after 30 days of culture. Regenerated shoots proliferated efficiently on a shoot multiplication medium consisting of MS medium containing 1.0 mg•L^-1 BAP and 0.1 mg•L^-1 NAA. Microshoots were rooted on a rooting medium made up of MS medium enriched with 0.5 mg•L^-1 IBA and 0.5 mg•L^-1 IAA. After hardening, 90% of plants were successfully established under greenhouse conditions. Histological observation revealed that shoot primordium originated from subepidermal cells of hypocotyl explants and directly developed into adventitious shoots without callus formation.

Key words: Key words: Euonymus fortunei var. radicans, direct organogenesis