A number of changes have taken place on chromosome 6H since the last coordinator's report. There are new names for old genes, new morphological loci have added, and many molecular loci have been added. There are, however, no substantial changes in the map itself.

The most up-to-date and 'correct' map is that given in Figure 6 by Franckowiak in BGN 26:17. It includes the loci in approximate order with the new (and old) gene symbols. Not much new linkage work has been reported with the morphological genes.

Feuerstein et al. (1990) have placed a leaf rust resistant locus (Rph11) on the long arm of chromosome 6H using isozymes. In the Disease Coordinator's report, J rgensen (1995) reported a QTL for scald resistance on chromosome 6H, and the resistance gene Rrs13 was located on chromosome 6H through molecular markers.

Künzel (1993) has added a number of BTT's balanced for msg6 to the collection for use in producing a high frequency of male steriles for producing hybrids. These are predominantly in the backgrounds of Trumpf, Lada, and Elgina. Hagberg et al. (1994) have published the localization of the breakpoints in a series of older 4-6 interchanges. This has resulted in the clear positioning of the breakpoints of 21 translocation lines, predominantly in a Bonus background, for use in genetic and breeding studies. Sodkiewicz et al. (1995) have used translocations to create duplications for several segments of chromosomes 5 (1H) and 6H. These duplication lines are housed at the Institute of Plant Genetics, Poznan, Poland.

Yoshimi and Konishi (1994) have located the Aat2 locus for aspartate aminotransferase on chromosome 6H using 3-point linkage with rob (o) and dsp9 (l9). Aat2 is about midway between rob and dsp9 on the long arm.

Soule et al. (1995) have located a multiovary mutant (designated JS68E) on chromosome 6H in the short arm near the centromere using molecular markers.

References:

Feuerstein, U., A.H.D. Brown, and T.J. Burdon. 1990. Linkage of rust resistance genes from wild barley (Hordeum spontaneum) with isozyme markers. Plant. Breed. 104:318-324.

Hagberg, G., P. Hagberg and L. Lehmann. 1994. Segmental interchanges in barley. IV. Translocations involving Chromosomes 4 and 6. BGN 24:94-101. J rgensen, J.H. 1995. Coordinator's report: Disease and pest resistance genes. BGN 25:106-107.

Künzel, G. 1993. Coordinator's report: Translocations and balanced tertiary trisomics. BGN 23:157-161.

Sodkiewicz, T., W. Sodkiewicz, and A. Hagberg. 1995. Five new duplications of segments in chromosomes 5 and 6 in barley. BGN 25:5-7.

Soule, J., I.Skodova, D. Kudrna, A. Kilian, and A. Kleinhofs. 1995. Molecular and genetic characterization of barley flower development mutants. BGN 25:76-80.

Yoshima, R. and T. Konishi. 1994. Linkage analysis of several isozyme loci in barley. BGN 24:35-37.