Adaptive mass selection in an exotic population of maize (Zea mays L.). Preliminary results
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Abstract
Mass selection has been indicated to enhance adaptation of exotic germplasm without losing favorable genetic components. The objective of this work was to evaluate the selection for adaptation in an exotic population of maize. A original population formed by intercrossing 16 exotic genotypes was improved for prolificacy, disease tolerance, and ear length for two cycles. The cycles of selection together with the original population were evaluated in trials during the summers of 1993/94 and 1994/95. A set of 110 individual half sib progenies, derived from the second cycle, prolific, non-prolific, or with higher harvest index were evaluated to test if differences in individual selection criteria correlated with the performance of resulting populations. The IC progenies had a slightly lower performance than the prolific or non-prolific ones. Selection was efficient in increasing prolificacy, reducing lodging and ear height, but increasing days to flowering. Yield showed a tendency to increase but without statistical significance.
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