Individual selection of the first backcross generation of passion fruit potentially resistant to the fruit woodiness disease.

This study was thus developed to estimate genetic parameters and predict the gain obtained from individual selection of genotypes in a population derived from backcrosses in passion fruit. The experiment was set up as a randomized block design with four replicates, involving five full-sib families (genotypes from the first backcross). Variance components and the genetic values were estimated for eight agronomic traits via the REML/BLUP procedure. For all traits, genotypic variance between the genotypes from the first backcross showed little contribution to the phenotypic variance. The low heritability estimates obtained for the traits are overcome via individual BLUP estimates. Therefore, it was possible to obtain considerable gains with individual selection for the variables fruit length, average fruit weight, and pulp weight (19.50 to 14.04%; 22.93 to 17.97%; and 10.08 to 7.95%, respectively). For the traits showing lower gains, it is possible to obtain gains indirectly by selecting genotypes for correlated traits. Because this population derives from the first backcross generation, agronomic traits still must be recovered.
PMID: 32609274 [PubMed - as supplied by publisher]

Source: An Acad Bras Cienc - July 2, 2020 Category: Science Authors: Preisigke SC, Viana AP, Santos EA, Santos PRD, AmbrÓsio M, Santos VOD, Silva FAD Tags: An Acad Bras Cienc Source Type: research