Autoria: JUNQUEIRA, V. S.; PEIXOTO, L. de A.; LAVIOLA, B. G.; BHERING, L. L.; MENDONCA, S.; COSTA, T. da S. A.; ANTONIASSI, R.

Resumo: The biggest challenge for jatropha breeding is to identify superior genotypes that present high seed yield and seed oil content with reduced toxicity levels. Therefore, the objective of this study was to estimate genetic parameters for three important traits (weight of 100 seed, oil seed content, and phorbol ester concentration), and to select superior genotypes to be used as progenitors in jatropha breeding. Additionally, the genotypic values and the genetic parameters estimated under the Bayesian multi-trait approach were used to evaluate different selection indices scenarios of 179 half-sib families. Three different scenarios and economic weights were considered. It was possible to simultaneously reduce toxicity and increase seed oil content and weight of 100 seed by using index selection based on genotypic value estimated by the Bayesian multi-trait approach. Indeed, we identified two families that present these characteristics by evaluating genetic diversity using the Ward clustering method, which suggested nine homogenous clusters. Future researches must integrate the Bayesian multi-trait methods with realized relationship matrix, aiming to build accurate selection indices models.

Ano de publicação: 2016

Tipo de publicação: Artigo de periódico

Unidade: Embrapa Recursos Genéticos e Biotecnologia

Palavras-chave: Características importantes, Concentração de forbol, Concentração de éster, Genótipos superiores, Melhoramento de pinhão manso, Métodos multi-traço Bayesian, Parâmetros genéticos, Peso sementes, Progenitores, Redução de toxidade, Teor de óleo de sementes, Óleo de sementes