Abstract
In order to investigate the regeneration of wild beet (Beta maritima) from inflorescence pieces, the effects of growth regulator, genotype, explant source and stage of plant development on adventitious shoot formation and rooting in vitro and subsequent transplanting in the glasshouse were tested. Inflorescence tips produced more adventitious shoots than sub-apical segments and the best micropropagation was achieved on a Murashige and Skoog (MS) medium supplemented with 1.0 mg l−1 BAP. Addition of auxin was not beneficial. The induction rate of adventitious shoots was genotype-dependent and influenced by the stage of plant development. Adventitious shoots were produced from the base of the flower buds, i.e. from the receptacle, not from axils or stalks and only a few buds on inflorescence tip explants produced adventitious shoots. Rooting was increased by using a MS medium with 3% sucrose supplemented with 1.0 mg l−1 NAA. There was no variation in leaf morphology of the transplants. This work shows that inflorescence tips can be used successfully as explants for in vitro multiplication of sugar beet and wild beet.
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