Abstract
ABSTRACT The aim of this study was to select S3 progenies of super sweet corn based on agronomic performance, evaluated in topcrosses with the narrow genetic base tester Honey Sweeter (Seminis®). The experiment was carried out in Guarapuava-PR. We evaluated 22 topcross hybrids and three checks, in two sowing times, in randomized blocks design with three replications. Six traits were evaluated: total yield of husked ears, commercial yield of husked ears, grain yield, grain length, ear diameter and total soluble solids content. Considering the set of evaluated traits, the topcrosses with progenies D2-07, D3-28, D4-53 and D5-24 were superior to the others; therefore, these progenies should continue in the inbreeding process and be evaluated in crosses with elite inbred lines with potential to generate competitive super sweet corn single hybrids.
Highlights
O trabalho teve por objetivo selecionar progênies S3 de milho super doce com base no desempenho agronômico, avaliadas em topcrosses com o testador Honey Sweeter, de base genética estreita
The super sweet corn is different from the common maize due to the recessive homozygous genes which prevent the conversion of sugars to starch in the endosperm, resulting in high concentration of reducing sugars (Zucharelli et al, 2012)
Considering the need to develop super sweet corn breeding program, this study aimed to select S3 progenies of super sweet corn based on the agronomic performance evaluated in topcrosses with a narrow genetic base tester
Summary
O trabalho teve por objetivo selecionar progênies S3 de milho super doce com base no desempenho agronômico, avaliadas em topcrosses com o testador Honey Sweeter, de base genética estreita. Considerando o conjunto das características avaliadas, os topcrosses com as progênies D2-07, D3-28, D4-53 e D5-24 foram superiores aos demais; portanto, essas progênies devem seguir no processo de endogamia e ser avaliadas em cruzamentos com linhagens elites com potencial para geração de híbridos simples de milho super doce competitivos. The super sweet corn is a vegetable available canned, frozen, in natura, dehydrated or even as baby-corn, when the ears are harvested before pollination (Reis et al, 2011). Most of the super sweet corn hybrids available in Brazil have the shrunken-2 gene, which promotes a higher concentration of sucrose in the endosperm when compared to genotypes carrying other genes (Gonçalves et al, 2018). As the sweet corn market for canning and frozen industry has expanded, the breeders face a challenge to develop genotypes showing high yield and high quality (Ufaz & Galili, 2008). The genotypes with potential for green corn must prolong harvest longevity, present ears larger than 15 cm (Albuquerque et al, 2008), and cream/yellow colored grains (Guimarães, 2014)
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