Abstract
Abstract The types of auxin in Murashige and Skoog (MS) medium containing N6-benzyladenine (BA) determined indirect morphogenesis, i.e. development to bipolar somatic embryos or monopolar shoots in Euphorbia nivulia Buch.-Ham. Indirect in vitro morphogenesis depended on growth regulators, explant excision period, and light. Calli induced from explants collected in March–April were superior in the induction of indirect morphogenesis to those collected in July–August. Light enforced in vitro morphogenesis, while darkness was inhibitory. The presence of kinetin in the medium also inhibited morphogenesis. Calli developed on explants collected in March–April grown on MS medium fortified with α-naphthaleneacetic acid (NAA) and BA facilitated indirect organogenesis, while those developed on medium containing 2,4-dichlorophenoxyacetic acid (2,4-D) and BA underwent somatic embryogenesis. MS medium with 13.3 μM BA and 2.69 μM NAA was the best for induction of shoots from callus, which developed a mean of 15.7 shoot...
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