Abstract
ABSTRACT The present study aims to characterize the genetic diversity of Passiflora setacea, P. edulis, their hybrids, and first-backcross progenies, and to indicate promising recombinants for generation advancement in a breeding program for transferring resistance to cowpea aphid-borne mosaic virus (CABMV). Ninety-one genotypes were evaluated for 37 morphoagronomic descriptors. The traits were analyzed to obtain a distance matrix, based on the Gower algorithm, using the Ward-Modified Location Model (MLM) procedure for the composition of genetic groups. The adopted strategy led to the formation of five homogeneous groups, where groups I, III, and V comprised the parents P. setacea, P. edulis and interspecific hybrids, respectively, while groups II and IV consisted of 69 genotypes of BC1. Broad variability was observed among the tested genotypes, and the highest was shown by group IV. Genotypes 17, 293, 355, and 501, from group IV, were the most promising for the second backcross cycle as they showed good resistance to the disease and desirable morphoagronomictraits.
Highlights
Most Passiflora species originated in Tropical and subtropical America can be found from Southern North America to Northeastern Argentina
For the continuity of the passion fruit selective-breeding program aimed at resistance to cowpea aphid-borne mosaic virus (CABMV), this study proposes i) to characterize species, hybrids, and populations obtained from the first Passiflora backcross based on morphoagronomic descriptors; ii) to estimate the genetic diversity among the studied genotypes based on a combined analysis of quantitative and multi-trait variables through the Ward-Modified Location Model (MLM) procedure; and iii) to indicate promising recombinants for generation advancement in the passion fruit selective-breeding program of State University of Northern Rio de Janeiro Darcy Ribeiro
The genotypes used in this study originated from the passion fruit selective-breeding program of the University of Northern Rio de Janeiro Darcy Ribeiro (UENF)
Summary
Brazil is one of the main genetic diversity centers of this family (Bernacci et al 2013). In the Brazilian scenario, passion fruit stands out as a crop with great potential for cultivation, marked expansion, and great popularization in domestic market (Ataíde et al 2012). Passiflora edulis Sims, known as “passion fruit” (or “sour passion fruit”, in Brazil), is the main commercial species thanks to its quality, vigor, and juice yield (Silva et al 2014). Among the factors responsible for the low yield of passion fruit in Brazil, diseases are those that most limit the expansion of cultivated areas; in some cases, they even lead to complete crop loss (Santos et al 2015 b)
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