Abstract
ABSTRACT Combining the use of agronomic, disease-resistance, and molecular informationcan greatly contribute to genetic progress in breeding programs. This study was developed to estimate the genetic distance between genotypes derived from backcrosses and their parents using morphoagronomic and molecular information and information pertaining to resistance to the Cowpea aphid-borne mosaic virus (CABMV), and indicate genotypes with potential for generation advancement. The studied population consisted of 91 genotypes from the first backcross, oneinterspecific hybrid, and the species Passiflora setacea and P. edulis. For morphoagronomic characterization, the traits number of fruits, total fruit weight, average fruit weight, and area under the disease progress curve (AUDPC, related to resistance to CABMV) were evaluated. Fourteen microsatellite primers were used to estimate genetic diversity among the genotypes, estimatediversity parameters and quantify the proportion of parental genome in the evaluated genotypes. The use of morphoagronomic and molecular information revealed the existence of genetic variability among the genotypes. The mean number of alleles is close to that expected for the population. Observed heterozygosity (0.42) was higher than the expected heterozygosity (0.30), indicating an elevated number of heterozygous individuals in the population. Due to their good agronomic performance, resistance to the virus, and genotypic and phenotypic distinction, genotypes 484 and 312 are recommended to compose the future stages of the passion fruit breeding program aimed at resistance to CABMV
Highlights
IntroductionPassion fruit (Passiflora edulis Sims), a member of the genus Passiflora, the largest and most important of the family Passifloraceae, originated in the Tropical and Subtropical Americas (Vanderplank 2000)
Passion fruit (Passiflora edulis Sims), a member of the genus Passiflora, the largest and most important of the family Passifloraceae, originated in the Tropical and Subtropical Americas (Vanderplank 2000).The sour passion fruit is the main species cultivated in Brazil, due to its quality, vigor, and juice yield
The objectives of this study were: i) to estimate the genetic distance between genotypes derived from a backcross and their parents, using morphoagronomic, resistance, and molecular information; ii) to undertake a genetic characterization by estimating genotypic indexes for the quantification and structuring of genetic variability; iii) estimate the genomic proportion of the recurrent parent in the population evaluated; iv) to conduct a joint analysis based on morphoagronomic and molecular information; and v) to select superior genotypes for generation advancement in the passion fruit breeding program aimed at resistance to Cowpea aphid-borne mosaic virus (CABMV)
Summary
Passion fruit (Passiflora edulis Sims), a member of the genus Passiflora, the largest and most important of the family Passifloraceae, originated in the Tropical and Subtropical Americas (Vanderplank 2000). The sour passion fruit is the main species cultivated in Brazil, due to its quality, vigor, and juice yield. The portion of fresh fruit in Brazil’s total passion fruit exports is restricted to 1.5%, because the domestic market absorbs almost all production. Concentrated juices represent the largest share of exports, achieve the best quotes and foreign exchange gains, and are most marketed in the Netherlands, the United States, Puerto Rico, Japan and Germany, which import 76% of concentrated juice produced in Brazil (Meletti et al 2011). The average yield of this species in Brazilian orchards reached 14.6 t∙ha-1 in 2018, and its potential production reaches more than 40 t∙ha-1 (IBGE 2019)
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