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Long-range physical mapping of the alpha-amylase-1 (alpha-Amy-1) loci on homoeologous group 6 chromosomes of wheat.

Long-range physical maps of the small multigene family of the malt alpha-amylase genes (alpha-Amy-1) located on the long arms of wheat chromosomes 6A (the alpha-Amy-A1 locus) and 6B (alpha-Amy-B1) were generated by pulsed-field gel electrophoresis analysis. By using three methylation-sensitive rare-cutter restriction endonucleases, NotI, NruI and MluI, and an alpha-Amy-1 cDNA probe and four gene-specific genomic probes from the alpha-Amy-B1 locus, the size of the alpha-Amy-A1 locus was estimated to be about 700 kb and of the alpha-Amy-B1 locus to be about approximately 4300 kb. These two maps indicate clustering of GC-rich and C-methylation-sensitive restriction enzyme recognition sites. At least five regions reminiscent of 'CpG islands' are apparent in alpha-Amy-B1, and three in alpha-Amy-A1. Correlation between recombination frequency and physical distance within the alpha-Amy-B1 locus suggests that 1 cM approximates to 1 Mb in physical distance.