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

Onildo Nunes De Jesus,Eduardo Augusto Girardi,Lucas Kennedy Silva Lima,Plácido Ulisses Souza

doi:10.1590/1678-4499.20200294

Onildo Nunes De Jesus, Eduardo Augusto Girardi + Show 2 more

Open Access

https://doi.org/10.1590/1678-4499.20200294

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Abstract

The genetic improvement of sour passion fruit has the main objective of obtaining genotypes with high fruit yield and quality. The determination of the ideal early selection is extremely relevant to reduce costs and time in the selection of promising genotypes for use in genetic improvement programs. In this context, this work aimed to determine the ideal selection phase through estimates of genetic parameters, phenotypic, genotypic correlations and analysis of repeatability. A total of 14 yellow passion fruit hybrids in Lençóis (Bahia State, Brazil) were evaluated in a randomized block design with five replications and nine agronomic traits from three harvests with five fruits evaluated per repetition. Genetic parameters, repeatability coefficient and phenotypic and genotypic correlations were estimated for each evaluation cycle. For most parameters, the traits changed according to the evaluation cycle. Most of the genetic parameters showed favorable genetic conditions for the selection in the first harvest. The correlations between the traits fruit weight, peel and seedless pulp weight, fruit length and diameter were more stable in the different harvests. Through the repeatability analysis based on the principal components of covariance and correlation, it was possible to estimate a sample of 13 fruits per hybrid for prediction with accuracy of 90% for the physical traits of sour passion fruit.

Highlights

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
Through the repeatability analysis based on the principal components of covariance and correlation, it was possible to estimate a sample of 13 fruits per hybrid for prediction with accuracy of 90% for the physical traits of sour passion fruit
The association of correlation analysis with determination of other genetic parameters of genotypic, phenotypic and environmental variation and heritability is fundamental to obtain information on the population (Moraes et al 2005; Bergo et al 2019) and to understand the action of genes involved in trait control (Silva et al 2012)

Summary

Introduction

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. Correlation analysis between traits contributes to the selection of promising genotypes, since the technique allows selecting traits that are difficult to measure but that have complex inheritance with another trait that is easy to measure (Oliveira et al 2011; Alves et al 2012; Malek et al 2014). This strategy allows faster progress in relation to the use of direct selection (Carvalho et al 2004; Moraes et al 2005). The association of correlation analysis with determination of other genetic parameters of genotypic, phenotypic and environmental variation and heritability is fundamental to obtain information on the population (Moraes et al 2005; Bergo et al 2019) and to understand the action of genes involved in trait control (Silva et al 2012)

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