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Effect of Leaf Angle on Hybrid Performance in Maize (Zea mays L.)¹

Two single-cross diallels of five erect-leaf (liguled) and five horizontal-leaf maize (Zea mays L.) inbred lines were compared for yield performance at two row widths and three stand densities at each row width. The inbred lines were known from previous evaluations to have aboveaverage general combining ability. The maximum difference of leaf angle between two hybrids was 30°, and the average difference between the two groups was 11°. The linear yield responses of the two hybrid groups to increased stand densities were different (P<0.01); the linear regression coefficients were 0.35 and 2.70 for the erect-leaf and horizontal-leaf groups, respectively. The data from this study suggest that for Corn Belt germplasm presently available the maize breeder should not restrict his selection to plant types that have a distinctly erect-leaf orientation.

Key Words: Erect-leaf maize • Stand densities • Row widths • Yields

² Professor, Iowa State University, Ames, Iowa 50010.

Received for publication July 2, 1971.