Chromosome location and microsatellite markers linked to a powdery mildew resistance gene in wheat line ‘Lankao 90(6)’

Abstract

Abstract Wheat lines known as ‘Lankao 90(6)’, derived from the cross ‘Mzalenod Beer’ (hexaploid triticale)/‘Baofeng 7228’//‘90 Xuanxi’, carry a recessive powdery mildew resistance gene temporarily named PmLK906 . Gene PmLK906 appears to be different from known wheat powdery mildew resistance genes. PmLK906 was tagged using microsatellite markers in a segregating population derived from the cross ‘Chinese Spring’/‘Lankao 90(6)21‐12’. The dominant microsatellite marker Xgwm265‐2AL was linked in repulsion with PmLK906 at a genetic distance of 3.72 cM, whereas the co‐dominant Xgdm93‐2AL was linked to PmLK906 at a genetic distance of 6.15 cM. Both markers were placed on chromosome arm 2AL using ‘Chinese Spring’ nulli‐tetrasomic lines. The recessive PmLK906 has a different specificity to the dominant resistance alleles located at the Pm4 locus and appeared to be located to a locus different from Pm4 .