Association of a stem rust resistance gene (Sr45) and two Russian wheat aphid resistance genes (Dn5andDn7) with mapped structural loci in common wheat

摘要

A stem rust resistance gene, originally derived fromTriticum tauschiiaccession RL5289 and present in the germplasm line 87M66-2-1, is here designatedSr45. Sr45was found to be closely linked toSr33(9 #xB1; 1.9 map units) and the centromere (21 #xB1; 3.4 map units) on chromosome arm 1DS.Sr45is believed to be the same gene asSrX.The Russian wheat aphid resistance gene,Dn5, was loosely linked (32 #xB1; 5 map units) toEp-D1b, which occurs on a translocation derived fromT. ventricosum, and to thecn?D1locus (37 #xB1; 6.3 map units) on chromosome arm 7DL.Dn5derives fromT. aestivumaccession Pl294994 which was found to express two novelEp-1alleles (proposed designationsEp-A1dandEp-D1e).A gene (here designatedDn7) for Russian wheat aphid resistance that was derived from the rye accession, Turkey 77', mapped 14.5 #xB1; 3.9 map units fromLr26on the 1BL.1RS translocation.