INHERITANCE OF CYCLIC HYDROXAMATES IN Zea mays L.

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Abstract
Hydroxamic acids have been implicated in the resistance of corn (Z. mays L.) to both fungi and insects. Five selected crosses were used among the 4 inbreds, BxBx, bxbx, B49 and B37, to study inheritance of hydroxamates. Hydroxamate concentration in the parental, F1, F2 and backcross generations for each cross was estimated by a rapid procedure based upon the colorimetric reaction of hydroxamates with FeCl3. Components of variance and estimates of heritability were obtained by the procedures of Warner (1952). F2 and backcross data indicated that concentration of hydroxamates is controlled monogenically in the cross bxbx .times. BxBx and polygenically in the crosses bxbx .times. B49 and bxbx .times. B37. Estimates of gene number using the Castle-Wright formula indicated that hydroxamate concentration is conditioned in B49 and B37 by 5 and 2 loci, respectively. The addition of BxBx to either B49 or B37 increased the frequency of genotypes in F2 with a high concentration of hydroxamates. Additive genetic variance was the most important component of the phenotypic variance and resulted in estimates of heritability from 0.64-0.79. However, the dominance component of variance was considerably higher for crosses involving BxBx than for the crosses bxbx .times. B49 and bxbx .times. B37.

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