GrainGenes

V. 1. Linkage maps of barley, 1979.

T. Tsuchiya, Department of Agronomy, Colorado State University, Fort Collins, Colorado 80523, U.S.A.

The number of genes located in the linkage maps of barley is 129 at present (Figure 1). The maps for chromosomes 5 and 6 are based on those prepared by the coordinator for these chromosomes: chromosome 5 by J. Jensen and chromosome 6 by K. J. Kasha. Seventy-four genes have been associated with chromosome or chromosome arms and are listed under each chromosome (Figure 1).

Figure 1. Linkage maps of barley, 1979. Genes associated with chromosomes but not located in the maps are listed under each chromosome. L and S in parenthese indicate the association of these genes with long (L) or short (S) arm.

It makes a total number of 203 genes associated with chromosomes. However, the maps have not been improved very much in the last 3 to 4 years, because the results obtained from conventional, translocation or primary trisomic analysis do not give information on the arm location of genes.

It is important to develop multiple marker stocks including newly assigned genes in each chromosome. Once these multiple marker stocks are developed, telotrisomic analysis of these genes will provide information on their arm location and the order of those genes in the map from the centromere.

Each chromosome coordinator is asked to try to develop multiple genetic marker stocks for each chromosome. If new gene(s) are combined with known gene(s) in each arm, it would be extremely useful in the telotrisomic analysis and eventually in improving barley linkage maps.
 

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