Originally published as Genetics Published Articles Ahead of Print on October 16, 2004.

Genetics, Vol. 169, 1169-1173, February 2005, Copyright © 2005
doi:10.1534/genetics.104.035980

Chromosome Identification and Nomenclature of Sorghum bicolor

* Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, Texas 77843
{dagger} Department of Horticulture, Texas A&M University, College Station, Texas 77843
{ddagger} USDA-ARS, Southern Plains Agricultural Research Center, College Station, Texas 77845
§ Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843

1 Corresponding author: Department of Soil and Crop Sciences, Texas A&M University, 370 Olsen Blvd., College Station, TX 77843-2474.
E-mail: stelly{at}tamu.edu

Linkage group identities and homologies were determined for metaphase chromosomes of Sorghum bicolor (2n = 20) by FISH of landed BACs. Relative lengths of chromosomes in FISH-karyotyped metaphase spreads of the elite inbred BTx623 were used to estimate the molecular size of each chromosome and to establish a size-based nomenclature for sorghum chromosomes (SBI-01–SBI-10) and linkage groups (LG-01 to LG-10). Lengths of arms were determined to orient linkage groups relative to a standard karyotypic layout (short arms at top). The size-based nomenclature for BTx623 represents a reasonable choice as the standard for a unified chromosome nomenclature for use by the sorghum research community.




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