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Journal of Heredity Advance Access published online on February 21, 2008
Journal of Heredity, doi:10.1093/jhered/esm112
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Correspondence of Trichome Mutations in Diploid and Tetraploid Cottons

Aparna Desai, Peng W. Chee, O. Lloyd May, and Andrew H. Paterson

From the Plant Genome Mapping Laboratory, University of Georgia, Athens, GA 30602 (Desai and Paterson); and the Department of Crop and Soil Sciences, University of Georgia, Tifton Campus, Tifton, GA 31793 (Desai, Chee, and May). O. Lloyd May is now at the Delta and Pine Land Company, 381 William Gibbs Road, Tifton, GA 31793

Address correspondence to P. W. Chee at the address above, or e-mail: pwchee{at}uga.edu.

Quantitative variation for leaf trichome number is observed within and among Gossypium species, varying from glabrous to densely pubescent phenotypes. Moreover, economically important cotton lint fibers are modified trichomes. Earlier studies have mapped quantitative trait loci (QTLs) affecting leaf pubescence in Gossypium using allotetraploids. In this study, we mapped genes responsible for leaf trichome density in a diploid A genome cross. We were able to map 3 QTLs affecting leaf pubescence based on trichome counts obtained from young leaves (YL) and mature leaves (ML). When the F2 progeny were classified as pubescent versus glabrous, their ratio did not deviate significantly from a 3:1 model, suggesting that glabrousness is inherited in a simple Mendelian fashion. The glabrous mutation mapped to linkage group A3 at the position of major QTL YL1 and ML1 and appeared orthologous to the t1 locus of the allotetraploids. Interestingly, a fiber mutation, sma-4(ha), observed in the same F2 population cosegregated with the glabrous marker, which indicates either close linkage or common genetic control of lint fiber and leaf trichomes. Studies of A genome diploids may help to clarify the genetic control of trichomes and fiber in both diploid and tetraploid cottons.

Corresponding Editor: John Burke

Received June 2, 2007
Accepted October 10, 2007


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