S1 and S2 imbred progenies selection in program for intrapopulational improvement of popcorn

• Autor(a) principal: Vilarinho, Aloisio Alcantara
• Data de Publicação: 2008
• Outros Autores: Soriano Viana, José Marcelo, Marinho Câmara, Tassiano Maxwell, dos Santos, João Francisco
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum. Agronomy (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/2393
• topic: milho pipoca; seleção; endogamia; índices de seleção; 5.00.00.00-4 Ciências Agrárias

One-hundred S1 and 225 S2 progenies obtained from the popcorn population “Beija-Flor” Zea mays L. (Poaceae), were evaluated in relation to yield, popping expansion and other agronomic characters. Genetic parameters were estimated and the predicted gains by selection were obtained according to several selection methods. Significant genotypic variability was observed for both yield and volume expansion. The direct selection for popping expansion was the method used in selecting thirty S1 progenies for intrapopulational improvement. A gain of 1.08 mL/g for volume expansion was predicted. The expected indirect gain for grain yield is irrelevant, mainly because of the negative genotypic correlation between these characters. For selection of thirty S2 families the index of Mulamba and Mock was used, with weights 1 and 3 for yield and volume expansion, respectively. A predicted gain of 0.81 mL/g was obtained for popping expansion