Predicted and realized gains of different selection strategies in soybean populations: a comparative study
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Data
2002
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Resumo
Genetic gains from selection on yield were predicted in three soybean populations using original data and
data corrected by the variation in agronomic traits of check cultivars. Predicted gains were compared to realized
gains after correction for agricultural season effects - caused by environmental differences during the prediction
and checking growing seasons - to indicate the best selection strategy and check the influence on yield of
selection on the other traits assessed in the field. Individual selection, selection among and within families and
combined selection were used for grain yield alone and for simultaneous selection on grain yield, plant height
and number of days to maturity traits. Selection was made on F5 generation plants grown in an experimental
field in Viçosa, Minas Gerais State during the 1997/98 agricultural season. The experiment used intercalated
check cultivars. The results indicated lower within family heritabilities compared to the other types. Little
variation was detected in gain prediction due to data correction. At field level, simultaneous selection performed
better for grain yield improvement. Simultaneous gains for number of pods per plant, number of seeds per pod
and mean weight of one seed, which are primary yield components, were obtained only when selection for the
three components was balanced.
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Palavras-chave
Glycine max, Heritability, Gain from selection
Citação
REIS, Edésio Fialho dos et al. Predicted and realized gains of diferent selection strategies in soybean populations: a comparative study. Crop Breeding and Applied Biotechnology, Viçosa, v. 2, n. 1, p. 61-70, 2002.