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Published in Crop Sci 7:179-182 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Methods of Measuring Drought Tolerance in Corn1

T. V. Williams, R. S. Snell and J. F. Ellis2

Three methods for measuring drought tolerance in corn are presented. They include: exposing corn seedlings to a 52 C temperature for 6 hours followed by recovery counts; germinating corn seed in mannitol solution at 15-atm osmotic pressure and selecting genotypes showing the highest percent germination; and subjecting corn seedlings to a 14-day permanent wilting period in a greenhouse followed by wilt ratings. Results were supported by observations from successive field plantings, one subjected to drought and one receiving normal rainfall. Any one method should be useful in screening a large number of corn genotypes for drought tolerance. Field evaluation is recommended to substantiate the data.

Key Words: germination • mannitol • high-temperature • wilting

1 Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree at Rutgers-The State University, New Brunswick, N. J., Soils and Crops Department. Study supported in part by and a contribution of Northeastern Regional Project N.E.-32, "Genetics and Breeding of Sweet Corn".

2 Formerly Graduate Assistant, (now Agronomist, SCS, USDA, National Plant Materials Center, Beltsville, Md.); Emeritus Professor of Plant Breeding, Rutgers-The State University; and formerly Graduate Assistant (now Field Representative, Geigy Chemical Company).

Received for publication October 13, 1966.




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