Caracterização agronômica em banco de germoplasma de pinhão manso no Recôncavo Baiano

Abstract

Jatropha (Jatropha curcas L.) is an oilseed crop that has been getting attention due to its favorable features for production of biodiesel, including the adaptability to various environments and compatibility with the profile of family farming. These characteristics have attracted investments in culture in order to meet the programs for production of biodiesel in the country. In order to expand the studies of jatropha, this project aimed to develop actions to give technical and scientific support to the agronomic characterization, seeking subsidize the development of cultivars in breeding programs and conservation of the species through studies of genetic diversity and genetic repeatability using different estimation methods. The study was conducted with 46 genotypes of active germplasm bank of jatropha of the Federal University of Bahia Reconcavo - UFRB, Cruz das Almas, where agronomic characterizations were performed using 15 characters. The divergence analysis enabled the formation of five distinct groups among accessions of Jatropha BAG, indicating the existence of genetic variability among the genotypes. Among the traits, character plant height (EST) was the largest contributor to this divergence with 41% contribution by the method of SING. The methods of principal components, CPCOR, CPCOV and AER, were more appropriate for the estimation of repeatability when compared with ANOVA. The repeatability coefficients were high for all the characters, indicating the possibility to predict the real genetic value of individuals with up to eight evaluations, considering the R2 of 95% in CPCOV method for selection and genetic gain in environment conditions Cruz das Almas, Bahia.