Genetic Relationship Between Tobacco Budworm Feeding Response and Gland Number in Cotton Seedlings1

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Abstract
Tobacco budworms, Heliothis virescens (F.), discriminated among seedlings of Upland cotton (Gossypium hirsutum L.) possessing the nine possible genotypes involving the gland‐determining alleles Gl2, gl2, Gl3ral, and gl3. The insect larvae preferred glandless seedlings (gl2gl2gl3 gl3), then showed a decreasing amount of preference as the number of Gl2 and Gl3ral alleles increased. Seedling damage, number of larvae left on the seedlings, number of pigment glands on the cotyledonary petiole, and percent seed‐gossypol were correlated inter se. A diallel analysis showed that additive effects accounted for 84 to 97% of the total genetic variances for seedling damage, number of larvae per seedling, and gland number. Dominance and epistatic effects were generally small, but sometimes statistically significant. The analysis showed also that Gl2 usually contributed more to the total additive genetic variance than did Gl3ral, an expected result because the former allele has a more profound effect on gland density and thus on gossypol content.

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