Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 25:32-34 (1985)
© 1985 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Genetic Study of Number of Involucral Bract Teeth in Cotton1

F. Douglas Wilson2

Texas 207 is a photoperiodic accession of cotton, Gossypium hirsutum L., that has many toothed involucral bracteoles (bracts) that enclose the flower bud more completely than do the few-toothed bracts of modern cultivars. This character could possibly be of value in deterring small insects, such as thrips, Frankliniella spp., from damaging very small flower buds. The inheritance of number of bract teeth was studied in a series of crosses with Texas 207 as one founder parent (x = 17.3 teeth/ bract) and a cultivar, Stoneville 7A (St 7A) as the other (g 8.7). From a cross of a day neutral selection of (T-207 x St 7A) with St 7A, quantitative and qualitative genetic analyses taken together suggested that those two parents differed by at least three pairs of genes which acted additively in concert. Narrowsense heritability, estimated in F2 on a plant basis, was 46%. I failed to transfer a high number of bract teeth into the 7A background apparently because certain advanced-generation populations from backcrosses to St 7A were too small to recover the many bract-teeth phenotype. However, the genetic analyses suggest that it should be possible to recover that phenotype by growing larger populations of BCnF2.

Key Words: Gossypium hirsutum L. • Host plant resistance • Quantitative inheritance • Additive variance • Heritability

1 Contribution from USDA-ARS, Phoenix, Ariz., in cooperation with the Arizona Agric. Exp. Stn.

2 Research geneticist, USDA-ARS, Western Cotton Res. Lab., 4135 E. Broadway Rd. Phoenix, AZ 85040.

Received for publication March 9, 1984.




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