A detailed RFLP linkage map of barley has been demonskated in BGN 21 as the NABGMP mapping progress report, using 150 doubled haploid (DH) lines derived from a cross combination between Steptoe and Morex (Kleinhofs, 1992). In the map of chromosome 3, 13 cDNA and 9 genomic markers are located, together with one morphological marker mPub (pubescent leaf) and one isozyme marker iBgl (beta-galactosidase). Meanwhile, two kinds of linkage analyses for isozymes and visible markers on chromosome 3 have been reported in the same issue of BGN (Netsvetaev, 1992a, 1992b), and two new loci of Ble (blue endosperm) and Est11 (esterase 11) are located in the chromosome. Although the title of his report (Netsvetaev, 1992b,) on page 63 in BGN 21 was mistaken as chromosome 1, the chromosome should be corrected to chromosome 3.

Furthermore, several useful genes on chromosome 3 are reported, although their loci have not been localized yet. For isozymes, EstlO (Brown and Munday, 1982), Mdh2 (Powling et al., 1981), Tpil (Pietro and Hart, 1985), and MEP-1 (Guerin, et al., 1992) were detected in wheatbarley addition lines. The resistant genes to Barley Mild Mosaic Virus (ym4) in Germany (Kaiser and Friedt, 1992) and to the strain II of Barley Yellow Mosaic Virus in Japan (Iida and Konishi, in preparation) were located also in chromosome 3. Localization of these loci in chromosome 3 is requested in the near future.

References:

Brown, A. H. D., and J. Munday. 1982. Population genetic structure of land races of barley from Iran. Genetica 58:85-96.

Guerin, J. R., R. C. M. Lance, and W. Wallace. 1992. Chromosomal location of a barley malt endopeptidase gene. Genet. Res., Camb. 59:179-181.

Kaiser, R., and W. Friedt. 1992. A gene for resistance to Barley Mild Mosaic Virus in German winter-barley is located on chromosome 3L. Plant Breed. 108:169-172.

Kleinhofs, A. 1992. The NABGMP mapping progress report, spring 1992. BGN 21:38-48.

Netsvetaev, V. P. 1992a. Linkage of Hordeum spontaneum blue endosperm gene (Ble) and two esterase loci (Est4, Estll) with marker genes on barley chromosome 3. BGN 21:60-63.

Netsvetaev, V. P. 1992b. Location on barley chromosome 3 of loci Estl and Est2, coding esterases 1 and 2. BGN 21:63-66.

Pietro, M. E., and G. E. Hart. 1985. The genetic control of trisephosphate isomerase of hexaploid wheat and other Triticeae species. Genet. Res., Camb. 45:127-142.

Powling, A., A. K. M. R. Islam, and K. W. Shepherd. 1981. Isozymes in wheat-barley hybrid derivative lines Riochem. Genet. 19:237-254.