The objective of this study was to evaluate the physiological seed quality of selected sweet corn genotypes and their relationship to heterosis. Fourteen sweet corn genotypes developed by the Universidade Estadual do Norte Fluminense Darcy Ribeiro were used. The genotypes were multiplied in Campos dos Goytacazes through controlled pollination to ensure genetic purity. The physiological quality was evaluated using germination and vigor tests, including: first germination count and seedling classification and emergence in sand. Results showed that the seeds with sweet endosperm were less vigorous than those with common endosperm. The sweet endosperm seeds of parental genotypes adapted to the region were more vigorous than those of non-adapted parents. Heterosis was observed for all germination and vigor traits in hybrid seeds when compared to their parents. Results indicate that hybrid development has an excellent potential for obtaining strong and more vigorous sweet corn seeds.
heterosis; sweet corn; seeds
