Genetic divergence between watermelon lines selected for resistance to Pappaya ringspot virus, type W

Abstract

Papaya ringspot virus, watermelon type (Pappaya ringspot virus-PRSV-W) is the main watermelon viral disease in Brazil. The work intended to evaluate the genetic divergence of watermelon lines type Crimson Sweet obtained from the cross of the resistant accession PI 595201 with Crimson Sweet and selected for to PRSV-W. Thirteen characteristics in 23 lines of the cross PI 595201 with Crimson Sweet and two control cultivars were evaluated. The genetic divergence was evaluated by multivariate procedures such as the Mahalanobis distance and by the Tocher's optimization grouping and nearest neighbor methods. The characteristics which contributed the most to the genetic divergence of the watermelon genotype were pulp coloration, total soluble solids, pH and titratable acidity. The Mahalanobis distance by the Tocher optimization grouping and nearest neighbor methods separated the lines into two distinct groups. The line WMX-001G-09-04-58-07pl#08 of group II was the most dissimilar in relation to the others of group I, which are

Estimation of Genetic Parameters of Turiaçu Pineapple Clones and Genetic Correlation between Traits

“…This result indicates that, for the studied population, genetic breeding may be more effective if focused on this trait of high heritability. In a breeding program for resistance to disease, one of the most important issues is the choice of the parents to obtain populations where the selection will be carried out or they will be used for the obtaining of hybrids [14]. In Turiaçu's pineapple population is possible to choose good parents as source of resistance to fusarium.…”