ANALYSIS OF A SET OF HOMOEOLOGOUS GROUP-1 WHEAT AEGILOPS UMBELLULATA RECOMBINANT CHROMOSOME LINES USING GENETIC-MARKERS

Eleven wheat-Ae. umbellulata recombinant lines involving chromosome 1U , including an important high-molecular-weight glutenin locus, were ch aracterized by protein and RFLP markers. Four 1U-1A recombinants, one 1U-1B recombinant, two 1U deletions with either nullisomy for chromoso me 1A or 1B and a 1U ditelosomic addition line were detected, while 3 recombinant lines involved 1U and non-homoeologous wheat chromosomes. Similar recombination events were found in independent lines, and no s mall segmental translocations of Ae. umbellulata chromatin were detect ed. Correlation of the markers with physical maps of the wheat-Ae. umb ellulata breakpoints obtained using in situ hybridization enabled the marker order to be established on chromosomes 1A, 1B and 1U. The short arm of chromosome 1A probably differs from both 1U and IB by one inve rsion. As now being found to be universal in the Triticeae, clustering of the genetical map in the distal physical regions of the group chro mosomes was found.