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

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, Gl₃^ral, and gl₃. The insect larvae preferred glandless seedlings (gl₂gl₂gl₃ gl₃), then showed a decreasing amount of preference as the number of Gl₂ and Gl₃^ral 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 Gl₃^ral, an expected result because the former allele has a more profound effect on gland density and thus on gossypol content.

Key Words: Gossypium hirsutum L. • Heliothis virescens (F.) • Seed-gossypol content • Diallel analysis • Larval non-preference

² Research Geneticists, Crops Research Division, ARS, USDA, College Station, Texas 77843 and Raleigh, North Carolina 27607, respectively.

Received for publication November 23, 1970.

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