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Genetic Relationship Between Tobacco Budworm Feeding Response and Gland Number in Cotton Seedlings 1
Author(s) -
Wilson F. D.,
Lee J. A.
Publication year - 1971
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1971.0011183x001100030032x
Subject(s) - biology , heliothis virescens , seedling , noctuidae , diallel cross , malvaceae , gossypol , lepidoptera genitalia , petiole (insect anatomy) , larva , botany , fiber crop , curing of tobacco , gossypium hirsutum , horticulture , epistasis , allele , gossypium , heliothis , hybrid , genetics , hymenoptera , gene
Tobacco budworms, Heliothis virescens (F.), discriminated among seedlings of Upland cotton ( Gossypium hirsutum L.) possessing the nine possible genotypes involving the gland‐determining alleles Gl 2 , gl 2 , Gl 3 ral , and gl 3 . The insect larvae preferred glandless seedlings ( gl 2 gl 2 gl 3 gl 3 ), then showed a decreasing amount of preference as the number of Gl 2 and Gl 3 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 Gl 2 usually contributed more to the total additive genetic variance than did Gl 3 ral , an expected result because the former allele has a more profound effect on gland density and thus on gossypol content.