CHROMOSOMAL LOCATIONS IN COMMON WHEAT OF 3 NEW LEAF RUST RESISTANCE GENES FROM TRITICUM-MONOCOCCUM

Monosomic analysis was conducted to determine chromosomal locations of three new leaf rust resistance genes recently transferred to common w heat (Triticum aestivum) from ir: monococcum. The resistance gene in w heat germplasm line KS92WGRC23 was transferred from T. monococcum ssp. monococcum. The resistance genes found in KS93U3 and KS96WGRC34 were transferred from T. monococcum ssp. aegilopoides. Allelism tests showe d that the three resistance genes were unlinked. The three lines were crossed with each of the seven A-genome Wichita monosomic lines. The l eaf rust resistance genes in KS92WGRC23, KS93U3, and KS96WGRC34 were l ocated on chromosomes 6A, 1A, and 5A, respectively, by monosomic analy sis. These results demonstrate that the three new genes derived from T . monococcum are each different. They also differ from previously repo rted Lr genes. This information on chromosome location and the develop ment of mapping populations will facilitate molecular tagging of the n ew genes.