Avaliação de progênies de meio-irmãos e identificação de clones promissores de pinhão-manso por meio de caracteres morfoagronômicos e moleculares

Abstract

The physic nut (Jatropha curcas L.) is an oilseed crop that is alternative raw material viable for biodiesel production, for being a species of low cost of cultivation, non-food, with good quality of the oil by the high fluidity and easy extraction, and present perspective of adaptation to different environments in Brazil. Despite the advantages of this kind, the technical and scientific information is still considered to be incipient. So, the objective was identifying promising clones in progeny half-sibs of physic nut through morphological and molecular characters. The work was carried out with 20 progenies of half-sibs of physic nut which were installed in the experimental field of University Federal of Recôncavo Bahia - UFRB in Cruz das Almas, Bahia, which were carried out agronomic and molecular characterizations through 9 characters phenotypic and 13 RAPD primers. The divergence analysis allowed the formation of four distinct groups among the progenies of physic nut, indicating the existence of genetic variability among them. The classification and ordering of genotypes for the characters of growth through mixed models, indicates individuals from families UFRB-PM 1, UFRB-PM 13, UFRB-PM 14 and UFRB-PM 9 as the best ranked. Results obtained from the performance study and repeatability of the plant's production of components, show lower yield potential to enable the production of this species in the Bahian Recôncavo region. High repeatability coefficient values obtained indicate the possibility of predicting the real genetic value of individuals with up to three evaluations, considering the R2 of 90% in PCCOR method for the selection and genetic gains.