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Journal of Heredity Advance Access originally published online on January 22, 2008
Journal of Heredity 2008 99(2):85-93; doi:10.1093/jhered/esm111
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Maize Centromere Mapping: A Comparison of Physical and Genetic Strategies

Ron J. Okagaki, Morrison S. Jacobs, Adrian O. Stec, Ralf G. Kynast, Elizabeth Buescher, Howard W. Rines, M. Isabel Vales, Oscar Riera-Lizarazu, Martha Schneerman, Greg Doyle, Katherine L. Friedman, Rick W. Staub, David F. Weber, Terry L. Kamps, Ina F. E. Amarillo, Christine D. Chase, Hank W. Bass, and Ronald L. Phillips

From the Department of Agronomy and Plant Genetics, University of Minnesota, St Paul, MN 55108-6026 (Okagaki, Jacobs, Stec, Kynast, Buescher, Rines, and Phillips); Plant Science Research Unit, the United States Department of Agriculture-Agricultural Research Service, St. Paul, MN 55108 (Rines); the Department of Crop and Soil Sciences, Oregon State University, Corvallis, OR 97331-3002 (Vales and Riera-Lizarazu); the Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120 (Schneerman and Weber); the Department of Agronomy, University of Missouri, Columbia, MO 65211-7020 (Doyle); the Department of Biology, Carleton College, Northfield, MN 55057 (Friedman and Staub); the Horticultural Sciences Department, University of Florida, Gainesville, FL 32611-0690 (Kamps and Chase); and the Department of Biological Science, Florida State University, Tallahassee, FL 32306-4370 (Amarillo and Bass). Morrison S. Jacobs is now at the Monsanto Co., 800 North Lindbergh Boulevard, St Louis, MO 63167; Ralf G. Kynast is now at the Jodrell Laboratory, Royal Botanic Gardens, Kew, Surrey, TW9 3AB, UK; Elizabeth Buescher is now at the Agronomy Department, Purdue University, West Lafayette, IN 47907-1150; Martha Schneerman is now at the Division of Research Safety, University of Illinois, Urbana, IL 61801; Katherine L. Friedman is now at the Department of Biological Sciences, Vanderbilt University, Nashville, TN 37235; and Rick W. Staub is now at the Orchid Cellmark Inc., 13988 Diplomat Drive, Suite 100, Dallas, TX 75234

Address correspondence to R. J. Okagaki at the address above, or e-mail: okaga002{at}umn.edu.

Centromere positions on 7 maize chromosomes were compared on the basis of data from 4 to 6 mapping techniques per chromosome. Centromere positions were first located relative to molecular markers by means of radiation hybrid lines and centric fission lines recovered from oat–maize chromosome addition lines. These centromere positions were then compared with new data from centric fission lines recovered from maize plants, half-tetrad mapping, and fluorescence in situ hybridizations and to data from earlier studies. Surprisingly, the choice of mapping technique was not the critical determining factor. Instead, on 4 chromosomes, results from all techniques were consistent with a single centromere position. On chromosomes 1, 3, and 6, centromere positions were not consistent even in studies using the same technique. The conflicting centromere map positions on chromosomes 1, 3, and 6 could be explained by pericentric inversions or alternative centromere positions on these chromosomes.

Corresponding Editor: Ernest Bailey

Received April 24, 2007
Accepted September 25, 2007


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