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Originally published as Genetics Published Articles Ahead of Print on April 3, 2007.
Genetics, Vol. 176, 115-123, May 2007, Copyright © 2007
doi:10.1534/genetics.107.071738
Integrative Mapping of Gossypium hirsutum L. by Meiotic Fluorescent in Situ Hybridization of a Tandemly Repetitive Sequence (B77)
Yuanfu Ji1, Xinping Zhao2, Andrew H. Paterson3, H. James Price and David M. Stelly4
Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843
4 Corresponding author: Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843.
E-mail: stelly{at}tamu.edu
We determined the relative positions of the tandem-repeat molecular cytogenetic marker B77, translocation breakpoints, and telosome arms in Gossypium hirsutum cytogenetic stocks by fluorescence in situ hybridization (FISH) analysis of meiotic quadrivalents in 16 single and 2 double translocation heterozygotes and five monotelodisomics. Results delimited the B77 FISH locus to the right arm of the D-subgenome chromosome 14 (14R) and the short arm (14sh), respectively. By equating 14R with 14sh and 14L (left) with 14Lo (long), the findings established a unified nomenclature for the arms of chromosome 14. Previously reported chromosome 14 arm locations were confirmed for four of the five translocations involving chromosome 14, namely NT1L-14L (2780), NT2R-14R (2B-1), NT14L-23R (2777), and NT14R-24R (2781), whereas the location of breakpoint T6L-14L was not confirmed and was reassigned to arm 14R. When used as a probe on Southern blots, the B77 signal was associated with a terminus of the D-subgenome RFLP linkage group (LG) D04 by linkage analysis of an interspecific F2 population, now known to be chromosome 20. However, additional codominant DNA marker information in the affected region excluded the B77 polymorphism detected by Southern blot hybridization from chromosome 20 and, indeed, from the remainder of the genome.
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