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TitleGenetic mapping and comparative analysis of seven mutants related to seed fiber development in cotton
AuthorsJunkang Rong, Gary J. Pierce, Vijay N. Waghmare, Carl J. Rogers, Aparna Desai, Peng W. Chee, O. Lloyd May, John R. Gannaway, Jonathan F. Wendel, Thea A. Wilkins, Andrew H. Paterson
PublicationTheor Appl Genet (2005) 111: 1137
AbstractAbstract Mapping of genes that play major roles in cotton fiber development is
an important step toward their cloning and manipulation, and provides a test of
their relationships (if any) to agriculturally-important QTLs. Seven previously
identified fiber mutants, four dominant (Li1, Li2, N1 and Fbl) and three
recessive (n2, sma-4(ha), and sma-4(fz)), were genetically mapped in six F2
populations comprising 124 or more plants each. For those mutants previously
assigned to chromosomes by using aneuploids or by linkage to other
morphological markers, all map locations were concordant except n2, which
mapped to the homoeolog of the chromosome previously reported. Three mutations
with primary effects on fuzz fibers (N1, Fbl, n2) mapped near the likelihood
peaks for QTLs that affected lint fiber productivity in the same populations,
perhaps suggesting pleiotropic effects on both fiber types. However, only Li1
mapped within the likelihood interval for 191 previously detected lint fiber
QTLs discovered in non-mutant crosses, suggesting that these mutations may
occur in genes that played early roles in cotton fiber evolution, and for which
new allelic variants are quickly eliminated from improved germplasm. A close
positional association between sma-4(ha), two leaf and stem-borne trichome
mutants (t1, t2), and a gene previously implicated in fiber development,
sucrose synthase, raises questions about the possibility that these genes may
be functionally related. Increasing knowledge of the correspondence of the
cotton and Arabidopsis genomes provides several avenues by which genetic
dissection of cotton fiber development may be accelerated.

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