Abstract
Four minor rDNA loci have been mapped physically to barley (Hordeum vulgare L.) chromosomes 1 (7I), 2 (2I), 4 (4I), and 5 (1I) by a two-stepin situ hybridization procedure including a GAA microsatellite sequence. Reprobing with the microsatellite resulted in a distinct banding pattern, resembling the C-banding pattern, which enabled unequivocal chromosome identification. This study suggests that gene mapping accuracy may be improved by using probes with well-characterized and narrow hybridization sites as cytological markers which are situated close to the gene locus. One of the rDNA loci is located about 54% out on the short arm of chromosome 4 and it has not previously been reported in barley. We have disignated the new locusNor-16. rDNA loci on homoeologous group 4 chromosomes have not yet been reported in otherTriticeae species. The origin of these 4 minor rDNA loci is discussed in relation to their equilocal distribution on the chromosomes.
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Pedersen, C., Linde-Laursen, I. Chromosomal locations of four minor rDNA loci and a marker microsatellite sequence in barley. Chromosome Res 2, 65–71 (1994). https://doi.org/10.1007/BF01539456
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DOI: https://doi.org/10.1007/BF01539456