Genetic diversity of the genus Passiflora using the Ward-MLM strategy

Abstract

The use of wild species of Passion fruit has resulted in progress in the genetic improvement of this crop. However the use of these species have been incipient, due to little information about the genetic diversity. These activities are essential to genetic resources of the genus Passiflora to be used successfully. This research aimed quantify the genetic variability between eleven species of the genus Passiflora (Passiflora edulis, P. mucronata, P. setacea, P. pentagona, P. caerulea, P. gibertii, P. cincinnata, P. suberosa, P. micropetala, P. alata and P.coccinea). It was used quantitative and qualitative descriptors being analyzed in conjunction by the Ward-MLM procedure (Modified Location Model). This technique identified five groups based on pseudo-F and pseudo-t2 statistics. The characters related with floral part were the main contributors to genetic variability of the accessions. The Ward-MLM statistical procedure made possible the distinction of the subgenera analyzed, and there was a clear separation between the related species. A wide diversity was found in the genus Passiflora, that can be explored in passion fruit tree improvement programs.