Caracterização molecular de acessos e famílias de meios-irmãos de pinhão manso

Abstract

Physic nut is a Euphorbiaceae with a wide distribution in the intertropical zones of the planet and which has been used for centuries for various purposes. More recently the jatropha oil was discovered as a good alternative to be explored as biodiesel source, because it presents valuable chemical and physical properties as well as good resistance to water deficit and low production cost estimates for being a perennial species. Many studies have been conducted around the world seeking alternatives to supply the demand for biofuels and one of them is the development of oilseed varieties with good phytosanitary, agro-morphological and phytochemicals features, but the species is still under domestication process, representing a great challenge for breeders. The following study aims the characterization of Jatropha accessions from the germplasm collection of the UFC and analyze the genetic diversity among these hits and their progenies of half-sib. To this were performed using DNA analysis ISSR molecular markers. Through Jaccard index, genetic dissimilarity matrices were generated, used in the creation of dendrograms and the grouping of individuals. The group was also performed according to the Tocher optimization method. Statistical analysis were performed using the GENES program. The studied accessions presented narrow genetic base, but there was significant increase in genetic variability in the progenies of half-sib, which may be selected for breeding as a source of variability in breeding programs.