Journal Article

Correspondence of Trichome Mutations in Diploid and Tetraploid Cottons

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

in Journal of Heredity

Published on behalf of American Genetic Association

Volume 99, issue 2, pages 182-186
Published in print March 2008 | ISSN: 0022-1503
Published online February 2008 | e-ISSN: 1465-7333 | DOI:
Correspondence of Trichome Mutations in Diploid and Tetraploid Cottons

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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.

Journal Article.  2381 words.  Illustrated.

Subjects: Genetics and Genomics

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