Influence of 24- epibrassinolide on in vitro shootlets regeneration via direct organogenesis of Phaseolus vulgaris L.

This study aimed to optimize an in vitro shootlets regeneration system via direct organogenesis for Phaseolus vulgaris L . cv. Brunca using 24- epibrassinolide (24-Epi). The best medium for shootlets proliferation as well as growth parameters was MS supplemented with 2 mg L -1 TDZ + 0.1 mg L -1 24-Epi. Stem explants recorded the best results of shootlets proliferation percentage compared with leaf or root explants, respectively. MS medium supplemented with 2 mg L -1 TDZ + 0.1 mg L -1 24-Epi gave the best results of recovered shootlets (%); photosynthetic pigments, number of leaves, number of shootlets and shootlet length (cm). From the obtained results it can be recognized that, the behavior and trends of 24-Epi on in vitro P. vulgaris cultures media may be oriented and arranged to the behavior of auxins in the nutrient medium for roots formation and as a cytokinin in shootlets proliferation. Keywords: Phaseolus vulgaris L . , 24- epibrassinolide, shootlets regeneration, direct organogenesis. African Journal of Biotechnology Vol 13(28) 2850-2857