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Choice of parental lines for common bean phaseolus vulgaris l. breeding ii. reaction of cultivars and of their segregant populations to variations in different environments

Choice of parental lines for common bean phaseolus vulgaris l. breeding ii. reaction of cultivars and of their segregant populations to variations in different environments

Revista Brasileira de Genetica 14(2): 455-466

Twelve parental lines and 32 segregant populations obtained from partial diallel crosses (4 .times. 8) were tested in six environments. F3 populations were tested in one environment, F4 populations in two and F5 populations in three. Phenotypic stability of grain yield, genetic and environmental variance, as well as variance of genotype .times. environment interaction were estimated for the 44 populations to determine the reaction of the parental lines and of the segregants to environmental variations. Parental line .times. environment interaction was more than double the segregant .times. environment interaction. The materials were also found to differ mainly in terms of deviation from regression and the parental lines were more unstable than the segregant populations, with significant deviation from regression in 75% of them as opposed to only 28% in the segregants. We conclude that the genetically homogeneous populations (parental lines) were more sensitive to environmental variation than the genetically heterogeneous populations (segregants).

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