Marcadores ISSR: diversidade genética e correlação com heterose em genótipos de Passiflora edulis Sims

Abstract

The main objective of this study was: i) estimate the genetic diversity using ISSR markers in 63 accessions from breeding program of passion fruit belonging to Embrapa Cassava & Passion Fruit; ii) estimate the general and specific combining ability of yield traits in simple hybrids from GP09 series iii) to correlate genetic distance obtained by ISSR and heterosis. As a result, ISSR markers showed high reliability when used to evaluate the genetic variability of passion fruit. High divergence was observed among the 63 accessions analyzed, as well as genotypes separation between improved and unimproved genotypes. These results could be useful to define strategies more efficient to be used in breeding program of passion fruit, such as on the crosses choice among the most contrasting genotypes. Thirty hybrids from the partial diallel showed significant differences for number of fruits, fruit weight, yield, pulp yield and total soluble solids. There was no significant correlation between genetic distance x heterosis and specific combining ability for the traits and ISSR analyzed.