Genotype analysis by trait is a practical and efficient approach on discrimination of inbred lines and identification of papaya (Carica papaya L.) ideotypes for fruit quality

Papaya is one of the most important fruit crops worldwide and its production depends on the availability of varieties that meet the consumer market demands. This study aimed to evaluate papaya inbred lines and select the best lines for fruit quality. A population of 97 lines of F 5 generation, that was conducted via Single Seed Descent method from the F 2 generation and derived from the crossing between Sekati and JS-12 genotypes of the heterotic group Formosa, were evaluated for nine morphoagronomic traits related to fruit quality. The data set was submitted to GT biplot and Pearson’s correlation analyzes using the R software. According to the results, the lines 96, 61, 39, 1 and 88 were indicated as favorable allele sources for the traits of average fruit weight, pulp volume, fruit firmness, pulp yield, and soluble solids, respectively. Lines 107, 19, 61 and 63 were indicated as ideotypes for per se use. Effectively, the application of the multivariate graphical approach GT biplot provides a practical and efficient new way to identify superior genotypes in papaya breeding programs.