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Inheritance of Drought Tolerance in Sweet Corn¹

Data obtained from the measurement of drought tolerance by several methods in six by six sweet corn (Zea mays L.) diallel crosses constituted the basis for an analysis of the inheritance of drought tolerance.

Variance-covariance regressions imply that, within the sample measured, the inheritance of drought tolerance in sweet corn follows a pattern of partial to nearly complete dominance. Combining ability estimates indicate that inbreds which exhibit high general combining ability for drought tolerance produce the greatest number of drought-tolerant hybrids. Frequency distributions of germination percentages for the F₂ and both F₁ backcross generations germinated in mannitol solution suggest that drought tolerance in sweet corn is under the genetic control of no less than three gene pairs, although in some families only one major gene may be segregating.

Key Words: Partial dominance • Combining ability analysis • Inheritance • Drought tolerance • Sweet corn

² Formerly Graduate Assistant in Soils and Crops (now Research Horticulturist, Birds Eye Division of General Foods Corp., County House Rd., Albion, N.Y.), Professor Emeritus, Soils and Crops, and formerly Assistant Professor, Applied and Mathematical Statistics, (now Assistant Professor, Crop Science, Michigan State University).

Received for publication July 12, 1968.