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Further Selection for Lower Ear Height in Maize¹

The effectiveness of selection for lower ear height and the associated responses of four agronomic traits were evaluated. In a previous study two populations of maize (Zea mays L.), ‘Antigua 2D’ x (BIO x B14) and ‘ETO’ x ‘CBC,’ were selected for lower ear height at a selection intensity of 50%. In this study they were submitted to two further cycles at 20% selection intensity. Evaluation was then made by means of topcrosses and populations per se. Ear height was reduced about 24% in both selected subpopulations during the four cycles, compared with the control subpopulations. Ear height of the control subpopulation in the ETO x CBC population decreased about 3% per cycle compared with the original population. Plant height was reduced to a lesser degree. Lodging decreased in the selected subpopulation of Antigua 2D x (BIO x B14) population but not in the ETO x CBC population. The selected subpopulations yielded progressively less than the control in each additional cycle of selection.

Key Words: Corn • Synthetic Varieties • Exotic germplasm • Lodging • Plant height • Zea mays L.

² Maize Breeder, Centre de Investigaciones Agronomicas, Maracay, Venezuela, and Professor of Agronomy, Purdue University.

Received for publication April 21, 1971.