Combining ability of potato parents for tuber appearance and tuber yield component traits

Laerte Reis Terres,Emerson Andrei Lenz,Murilo Cerioli,Dediel Rocha,Arione Da Silva Pereira

doi:10.1590/1984-70332017v17n2a16

Laerte Reis Terres, Emerson Andrei Lenz + Show 3 more

Open Access

https://doi.org/10.1590/1984-70332017v17n2a16

Copy DOI

Abstract

Abstract The purpose of this study was to estimate the combining ability between two groups of potato parents in early generations of selection. Twelve potato families, derived from two groups of parents crossed in a 4x3 partial diallel design, were evaluated, in a randomized complete block design with three replications. Additive effects of genes were predominant for the traits tuber shape uniformity, tuber pointiness, tuber curvature, general tuber appearance, tuber size uniformity, tuber number, total tuber yield, and average tuber weight. With regard to general combining ability, for all tuber appearance traits, the foreign parents ‘Pukara’ and ‘Asterix’, and the national parent ‘Eliza’ contributed with complementary favorable alleles. For tuber yield component traits, the foreign parent ‘Rioja’ and the national parent ‘Eliza’ were outstanding. The specific combining ability indicated ‘Pukara’/‘Eliza’ as the most promising cross for the development of superior genotypes for the traits general tuber appearance and tuber number.

Highlights

Potato is a highly heterozygous crop, in which the influence of additive gene action is known to be relevant for most agronomic traits
Important parameters can be estimated for parental selection and to obtain information about the genetic effects involved in the trait control
In the diallel analysis method proposed by Griffing (1956), the mean performance of each genotype is partitioned into the general combining ability and specific combining ability

Summary

Introduction

Potato is a highly heterozygous crop, in which the influence of additive gene action is known to be relevant for most agronomic traits. Important parameters can be estimated for parental selection and to obtain information about the genetic effects involved in the trait control. In the diallel analysis method proposed by Griffing (1956), the mean performance of each genotype is partitioned into the general combining ability (main effects) and specific combining ability (interactions). The general combining ability (GCA) indicates the mean behavior of a parent in a series of hybrid combinations and is associated with additive allele effects and additive epistatic actions, whereas the specific combining ability (SCA) indicates the deviations of hybrid performance from what would be expected, based on the GCA, and is associated with the effects of dominance and epistatic deviations, involving dominance (Cruz et al 2012, Ramalho et al 2012)

Objectives

Methods

Results