Inbred Line Extraction from Improved Breeding Populations

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Date
1975/1976
Authors
Darrah L. L.
. Penny: L. H
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Abstract
Inbred maize line were extracted from the second cycle of reciprocal recurrent selection in Kitale II and Ecuador 573. These were evaluated as S3 X S3 single crosses and three way crosses were predicted. The best predicted three-way crosses were made and grown in comparison with the current variety cross. Yields of the best 1 per cent of the second cycle three-way crosses exceeded the predicted value of fourth cycle of the variety cross by only 2 per cent. The gain in yield of the three-way crosses over the variety-cross did not justify the additional work required for four years of development. While gain from selection in the variety cross remains linear, the decision to extract lines must be based on anticipated agronomic or seed production improvements.
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East African Agricultural And Forestry Journal, 41, p. 1-8
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