Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 14:551-556 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Selection for Leaf Angle in Maize and Its Effect on Grain Yield and Other Characters1

R. P. Ariyanayagam, C. L. Moore and V. R. Carangal2

Four generations of bidirectional phenotypic selection for leaf angle was practiced in a maize (Zea mays L.) variety using two leaf-angle determinations; one method estimated the angle in the immediate vicinity of the culm, the other the angle to the tip of the leaf blade. Regression coefficients of 3.82 and 10.18° over selection cycles were found for the two angle measurements. Average change in leaf angle was 10 to 12% per cycle in each direction. Leaf blade and midrib thickness, but not leaf length and width, were associated with angle. Erect leaf types were generally shorter in plant height, later in maturity, higher in lodging resistance, and higher in light transmissibility. Relative leaf angle remained constant over stages of growth and position on the plant. Grain yield variations attributable to leaf angle differences were small and statistically insignificant at planting densities from 40,000 to 80,000 plants/ha.

Key Words: Erect leaf maize • Leaf characters • Plant type

1 Contribution from the University of the Philippines College of Agriculture, Los Banos (Contribution No. 73-42); Kasetsart University, Bangkok, Thailand; and the Inter-Asian Corn Improvement Program, G.P.O. Box 2453, Bangkok, Thailand. Based on a portion of the dissertation submitted by the senior author in partial fulfillment of the requirements for the M.S. degree, University of the Philippines College of Agriculture. Field research was conducted in Thailand.

2 Former graduate student; Associate Plant Breeder, The Rockefeller Foundation; and Assistant Professor of Agronomy, University of the Philippines College of Agriculture, Los Banos.

Received for publication November 10, 1973.


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J. O. Hay, B. Moulia, B. Lane, M. Freeling, and W. K. Silk
Biomechanical analysis of the Rolled (RLD) leaf phenotype of maize
Am. J. Botany, May 1, 2000; 87(5): 625 - 633.
[Abstract] [Full Text]


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