Propagação in vitro de pinhão-manso

Abstract

Due to growing interest about Jatropha curcas L. cultivation, an oil crop from the Euforbiaceae family with potential for biofuel production, it is necessary to apply biotechnology tools that make possible the development and selection of genotypes with the features of interest and better health. Accordingly, the establishment of efficient culture conditions and regeneration protocols for local interest genotype is of great importance. Therefore the aim of this study was try to establish the best conditions for the in vitro propagation for genotypes from the Embrapa Clima Temperado breeding program. Initially we investigated the optimization of the process of in vitro germination of seeds, as an initial source of explants, where it was observed that the addition of 0.94 μM GA3 resulted in better average germination. About the regeneration protocol, after changing the composition of the culture media and cultivation conditions, there was no significant difference between the different callus induction treatments, though we observed a reduction in the development of explants that were maintained in more intense light. For elongation of adventitious shoots, the most effective treatment was T1: 9,69 μM AIA + 2,22 μM BAP. For the shoot rooting was used MS medium with half salt concentration plus 2.07 μM IBA. 12 regenerated and rooted plants were obtained, though these did not survive the acclimatization process Apical in vitro culture assays were performed in which it was observed that the treatment T2: 22.2 μM BAP + 2.07 μM IBA + 1 gL-1 of activated carbon can be an alternative for the propagation of the species.