Correlações entre alguns caracteres agronômicos em soja (Glycine Max (l.) Merrill)
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1991-10-23
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Revista Ceres
Resumo
Estimaram-se as correlações fenotipicas, genotipicas e de ambiente entre alguns caracteres agronomicos em cinco populações F2 de soja, de quatro diferentes cruzamentos: 'Cometa' x 'IAC-8' em plantio convencional, 'Cometa' x 'IAC-8' em plantio por mudas, 'Cometa' x 'IAC-12', 'Parana' x 'IAC-8' 'Parana x 'IAC-12'. Elevadas estimativas de correlação genotipica foram encontradas em todos os cruzamentos, exceto no cruzamento 'Parana' x 'IAC-12', em que a maioria des estimativas de variancia genotipica foi negativa. Pelas estimativas obtidas, conclui-se que: 1) a seleção de plantas altas e precoces dificultada pela correlação genotipica positiva entre os caracteres dias para o florescimento e maturação com altura de planta; 2) a seleção da altura da planta pode ser realizada tanto por ocasião do florescimento como da maturação; 3) a seleção dos caracteres dias para o florescimento e dias para a maturação pode ser realizada com base apenas naquele caráter que apresentar major herdabilidade; o plantio por mudas, de modo geral, afetou as estimativas de correlação fenotipica e genotipica, gerando valores mais altos.
Phenotypic, genotypic and enviroment correlations between some agronomia traits in five F2 populations of soybeans were estimated, in four different crosses: 'cometa' x 'IAC-8', 'cometa' x 'IAC-12', 'Parana' x 'IAC-8', 'Parana' x 'IAC-12'. Cross 'Cometa' x 'IAC-8' was tested under two conditions: direct and iachrect sowing. High estimates of genotypic correlation were found in all crosses, except 'Parana' x 'IAC-12', in which most of the estimates of genotypic variances were negative. It can be concluded that: 1) the selection of tall and early maturity plants is difficult due o the negative correlation between these traits; 2) the selection for plant height can done both at flowering or maturity time; 3) the selection for days to flowering and days to maturitycan be done together, based only on that character which has the higher heritability; 4) indirect sowing, in general, affected the genotypic and phenotypic correlations estimated, producing higher values.
Phenotypic, genotypic and enviroment correlations between some agronomia traits in five F2 populations of soybeans were estimated, in four different crosses: 'cometa' x 'IAC-8', 'cometa' x 'IAC-12', 'Parana' x 'IAC-8', 'Parana' x 'IAC-12'. Cross 'Cometa' x 'IAC-8' was tested under two conditions: direct and iachrect sowing. High estimates of genotypic correlation were found in all crosses, except 'Parana' x 'IAC-12', in which most of the estimates of genotypic variances were negative. It can be concluded that: 1) the selection of tall and early maturity plants is difficult due o the negative correlation between these traits; 2) the selection for plant height can done both at flowering or maturity time; 3) the selection for days to flowering and days to maturitycan be done together, based only on that character which has the higher heritability; 4) indirect sowing, in general, affected the genotypic and phenotypic correlations estimated, producing higher values.
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Soja, Caracteres agronômicos