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Association of a stem rust resistance gene and two Russian wheat aphid resistance genes with mapped structural loci in common wheat



Association of a stem rust resistance gene and two Russian wheat aphid resistance genes with mapped structural loci in common wheat



South African Journal of Plant & Soil 15(2): 67-71



A stem rust resistance gene, originally derived from Triticum tauschii accession RL5289 and present in the germplasm line 87M66-2-1, is here designated Sr45. Sr45 was found to be closely linked to Sr33 (9 +- 1.9 map units) and the centromere (21 +- 3.4 map units) on chromosome arm 1DS. Sr45 is believed to be the same gene as SrX. The Russian wheat aphid resistance gene, Dn5, was loosely linked (32 +- 5 map units) to Ep-D1b, which occurs on a translocation derived from T. ventricosum, and to the cn-D1 locus (37 +- 6.3 map units) on chromosome arm 7DL. Dn5 derives from T. aestivum accession P1294994 which was found to express two novel Ep-1 alleles (proposed designations Ep-A1d and Ep-D1e). A gene (here designated Dn7) for Russian wheat aphid resistance that was derived from the rye accession, 'Turkey 77', mapped 14.5 +- 3.9 map units from Lr26 on the 1 BL.1RS translocation.

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Accession: 030206319

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