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The Journal of Heredity 1999:90(3)
© 1999 The American Genetic Association 90:428-429

Brief communication. Identification of B chromosomes using Giemsa banding in Medicago

MA Hossain, and GR Bauchan1

1U.S. Department of Agriculture, Agricultural Research Service, Plant Sciences Institute, Soybean and Alfalfa Research Laboratory, Beltsville, MD 20705-2350, USA University of Maryland, Natural Resources and Landscape Architecture Department, College Park, Maryland, USA

This is the first verified report of the existence of B chromosomes in the genus Medicago. During a routine cytogenetic investigation of diploid M. sativa ssp. falcata (L.) Arcangeli accessions obtained from the U.S. National Plant Germplasm System, we discovered two accessions, PI 115365 and PI 486207, each with three plants that were aneuploid (2n = 17). C-banding analysis of root-tip cells showed that the extra chromosomes were highly heterochromatic B chromosomes. The Giemsa banding pattern of the A-chromosome complement in the aneuploid cells was not altered from the banding patterns of normal cells.


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