Agronomic performance of super-sweet corn genotypes in the north of Rio de Janeiro

Desempenho agronômico de genótipos de milho super-doce na região norte fluminense

Pedro Henrique Araújo Diniz Santos Messias Gonzaga Pereira Roberto dos Santos Trindade Keila Silva da Cunha Geovana Cremonini Entringer Julio Cesar Fiorio Vettorazzi About the authors

We investigated the agronomic performance of super-sweet corn genotypes. Super-sweet corn genotypes were backcrossed with regionally adapted field varieties (CIMMYT 8 and Piranão 8). Eight morphological and yield-related traits were evaluated. A significant effect of interaction was observed between the five groups of genotypes (donor parents; super-sweet backcrossed parents; super-sweet intervarietal hybrids; common intervarietal corn hybrids; and field corn populations). Despite the low yield of genotype SH2Piranão, the hybrids resulting from interbreeding of the backcrossed parents for the improvement of super-sweet corn were promising. The agronomic performance of the super-sweet parents and their hybrids indicates the possibility of breeding lines with high genetic value to obtain single-cross hybrids and cultivars of super-sweet corn adapted to the northern region of the State of Rio de Janeiro.

Zea mays; super-sweet corn; intervarietal hybrids; heterosis; yield

Crop Breeding and Applied Biotechnology Universidade Federal de Viçosa, Departamento de Fitotecnia, 36570-000 Viçosa - Minas Gerais/Brasil, Tel.: (55 31)3899-2611, Fax: (55 31)3899-2611 - Viçosa - MG - Brazil