Boletim de Pesquisa Online Nº 1, dez./99 |
Abstract
Androgenetic capacity was observed in Brazilian wheat genotypes derived from a special project for morphological and physiological adaptation to humid climate. Crosses combining the androgenetic capacity and the agronomic performance of the parents were made. Anthers belonging to 1,295 genotypes including cultivars and F1 to F7 populations were cultured: 46.0 % formed androgenetic embryos and 17.0% regenerated green plants; in the best androgenetic genotypes, 4.2% of the anthers developed embryogenetic structures and 65.0 % of them regenerated green plantlets: 1,182 fertile double-haploid lines were obtained and multiplied for agronomic evaluation. In preliminary wheat yield trials, 152 of them were selected, eight were promoted to the regional trial and three to the Southern Brazilian wheat trial. The PF 853031 line, which was named Trigo BR 43, was the first in Americas and the fourth worldwide cultivar obtained by androgenesis, released in 1991. Presented a mean yield 16% higher than the three best control cultivars recommended at the time. Many other outstanding androgenetic double-haploid lines were obtained thereafter by this methodology.