Partial diallel and potential of super sweet corn inbred lines bt 2 to obtain hybrids

Larissa Fernanda S Xavier,Jéssica Kelly Pestana,Rosângela Maria P Moreira,Josué M Ferreira,Matheus D Krause,Alline Sekiya

doi:10.1590/s0102-053620190305

Larissa Fernanda S Xavier, Jéssica Kelly Pestana + Show 4 more

Open Access

https://doi.org/10.1590/s0102-053620190305

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Journal: Horticultura Brasileira	Publication Date: Jul 1, 2019
Citations: 3	License type: CC BY 4.0

Affiliation: Universidade Estadual de Londrina

Abstract

ABSTRACT The aims of this study were to determine the potential of S4 super sweet corn inbred lines for hybrid synthesis, identify the predominant types of gene action and correlations among different traits, significant for breeding programs. The 81 hybrids obtained from a partial diallel 9x9 and three checks were evaluated. A complete randomized block design, with three replicates, and two sowing seasons was used. We could notice significant hybrid effects, general combining ability (GCA) of GI and GII groups and specific combining ability (SCA) in relation to evaluated traits, highlighting the existence of hybrids with superior performance and the expression of additive and non-additive effects. The inbred lines: L1, L3, L6 and L9 (GI) and L1’, L7’ and L9’ (GII) showed the best GCA and SCA estimates, being present in the nine selected hybrids with superior and competitive performance in relation to the checks. The estimated correlations indicate that, for a breeding program aiming to increase grain productivity, evaluating, at least, the dehusked ears, prioritizing genotypes with larger ear diameters and longer ear lengths is important.

Highlights

The aims of this study were to determine the potential of S4 super sweet corn inbred lines for hybrid synthesis, identify the predominant types of gene action and correlations among different traits, significant for breeding programs
In Brazil, these days, few cultivars of sweet and super sweet corn seeds are available to farmers, only 65 cultivars are registered by the Ministry of Agriculture, Livestock and Food Supply (Brazil, 2018)
The average squares for treatments, hybrids and their unfolding in general combining ability (GCA)-I, GCA-II and specific combining ability (SCA), for the traits evaluated in two sowing dates, were significant, with exception of “days to flowering” in the second sowing date (Table 1)

Summary

Introduction

The aims of this study were to determine the potential of S4 super sweet corn inbred lines for hybrid synthesis, identify the predominant types of gene action and correlations among different traits, significant for breeding programs. The inbred lines: L1, L3, L6 and L9 (GI) and L1’, L7’ and L9’ (GII) showed the best GCA and SCA estimates, being present in the nine selected hybrids with superior and competitive performance in relation to the checks. Super sweet corn is considered a vegetable and it is dedicated exclusively for human consumption It has a high nutritional value, being consumed in natura or processed by vegetable canning industries in several countries (Kwiatkowski & Clemente, 2007; Teixeira et al, 2013; Luz et al, 2014). Hybrids of super sweet corn inbred lines are cultivars which best meet canning industry demands, due to its uniformity and agronomic performance (Kwiatkowski & Clemente, 2007; Luz et al, 2014). Developing new superior hybrid combinations is essential for expansion of super sweet corn production in Brazil (Santos et al, 2014)

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