Backcrosses in a segregating population of Passiflora mediated by morphoagronomic and resistance traits

Abstract

The present study aims to characterize the genetic diversity of Passiflora setacea, P. edulis, their hybrids, and firstbackcross progenies, and to indicate promising recombinants for generation advancement in a breeding program for transferring resistance to cowpea aphid-borne mosaic virus (CABMV). Ninetyone 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 PLANT BREEDING -Article 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 BC 1 . 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 morphoagronomic traits.

Research Article Evaluation of resistance to <i>Cowpea</i><i> aphid-borne</i> <i>mosaic</i> <i>virus</i> in passion fruit backcrosses for recurrent selection and development of resistant cultivars

“…The passion fruit breeding program of the Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF) seeks sources of resistance to CABMV, via the incorporation of resistance genes in a population of passion fruit from interspecific crosses between Passiflora edulis 'UENF Rio Dourado' (P. edulis) x Passiflora setacea (P. setacea -wild species) and generations of backcrosses (Santos et al, 2015;Santos et al, 2019b;Preisigke et al, 2020a and b), besides conducting studies on the inheritance of resistance (Freitas et al, 2015;Santos et al, 2019a). Studies related to the diversity of the genus Passiflora and breeding methods to identify genotypes with resistance to CABMV with productive potential are extremely important for the sustainability of this crop in Brazil.…”

Genetic parameters, correlation and repeatability of agronomic characters of yellow passion fruit genotypes in three harvest cycles

“…The genetic breeding programs of sour passion fruit (Passiflora edulis Sims) aims to obtain genotypes with high productive potential and fruit quality, such as high juice yield and content of soluble solids and low acidity. In addition, resistance is necessary to the main pathogens that shorten the lifespan of orchards in different regions of Brazil (Lima et al 2018;Pereira et al 2019;Santos et al 2019).…”