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Published online 1 September 1969
Published in Agron J 61:669-672 (1969)
© 1969 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Measurement of Drought Resistance in Corn1

T. C. Kilen and R. H. Andrew2

Twelve dent and sweet corn lines exhibiting a range of phenotypic response to field drought were exposed to 1) a heat and atmospheric-drought test of seedlings, 2) a test for chlorophyll stability of leaf tissue, and 3) conduction inhibition test of excised leaves. At two locations during 2 years in the field, lines were rated for leaf firing and measured for leaf blade area, tiller number, plant height, leaf number, stomatal number, and stem vascular bundle number. Results were positively and highly correlated among the three objective tests and for each test with leaf filing in the field. Plant height, but not other morphological measurements, was negatively and significantly correlated with test results and with leaf firing in the field.

Key Words: Heat and atmospheric drought • Chlorophyll stability • Conduction inhibition • Firing index • Genotype • Morphology • Correlations

1 Contribution from the Department of Agronomy, University of Wisconsin, Madison, Wis. Published with the approval of the Director, Wisconsin Agr. Exp. Sta. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Use of the machines of the Wisconsin Numerical Analysis Laboratory was supported by the National Science Foundation and by the Wisconsin Alumni Research Foundation through a grant by the Research Committee of the Graduate School.

2 Formerly graduate assistant (now Research Geneticist, Crops Research Division, ARS, USDA, Stoneville, Miss. 38776.) and Professor of Agronomy, University of Wisconsin, Madison 53706. The authors acknowledge contributions from J. H. Torrie to the statistical aspects of this paper and from Gavin Weis of the Hancock Experimental Farm.

Received for publication December 16, 1968.




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Copyright © 1969 by the American Society of Agronomy.