LAUSR

EnglishThe effectiveness of early generation selection was practiced in bacterial blight resistance genes introgressed F2 and F2:3 population of the cross CB 174 R × IRBB 60 in rice. F2 Selection have been proved to be robust and effective tool in crop improvement program. Selection differential was positive for all studied traits. Selection response was high for number of grains, thus indicating the effectiveness of selection for these character. Realized heritability was found high for number of grains and thousand grain weight, suggested that direct selection was effective. Expected selection response and predicted genetic gain was high for number of grains. Parent-offspring correlation showed low but significance association for number of productive tillers (r=0.47**, P Key words: selection response; realized heritability; selection differential portuguesA eficacia da seleccao das primeiras geracoes foi praticada na populacao F2 e F2: 3 de CB 174 R × IRBB 60 do gene bacteriano. A selecao foi positiva para todos os caracteres estudados. A resposta de selecao foi alta para o numero de graos. A herdabilidade realizada foi encontrada alta para o numero de graos e mil graos de peso, sugeriu que a selecao direta foi eficaz. A resposta a selecao esperada e o ganho genetico previsto foi elevado para o numero de graos. A correlacao entre pais e filhos mostrou forte associacao com o numero de latifundiarios produtivos (r = 0,47**, P Palavras-chave: selecao; ardor bacteriano; correlacao; regressao