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Genetic Mapping of a Triticum monococcum-derived Powdery Mildew Resistance Gene in Common Wheat

L. M. Miranda^a,*, L. Perugini^a, G. Srni^b, G. Brown-Guedira^c, D. Marshall^c, S. Leath^d and J. P. Murphy^a

^a Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695
^b Pioneer Hi-Bred Italia, Via Giuseppina 39, Malagnino, Cremona 26030 Italy
^c USDA-ARS; North Carolina State Univ., Raleigh, NC 27695
^d Dep. of Plant Pathology, North Carolina State Univ., Raleigh, NC 27695

View larger version (30K): [in this window] [in a new window]   Figure 1. Genotyping of the NCA6 · Saluda F2 population using microsatellite marker Xbarc121. aF2 progeny labeled according to the disease reaction of their F2–derived family: Re, resistant; Se, segregating; Su, susceptible.

View larger version (11K): [in this window] [in a new window]   Figure 2. Comparative view of the NCA6 linkage map with other previously published genetic maps for Pm loci on chromosome 7AL. aMap position of Mlm2033 according to Yao et al. (2007), bmap position of Mlm80 according to Yao et al. (2007), cmap position of Pm1a according to Neu et al. (2002), dmap position of Pm1e according to Singrün et al. (2003).

View larger version (9K): [in this window] [in a new window]   Figure 3. Comparative view of the NCA6 linkage map with the genetic maps for two other major powdery mildew resistance genes mapped to chromosome 7AL in North Carolina germplasm lines. aMap position of the NCAG11 Pm gene according to Srni et al. (2005), bmap position of the NCA4 Pm gene according to Srni et al. (2005).

View larger version (9K): [in this window] [in a new window]   Figure 4. Chromosomal breakpoint intervals for microsatellite markers linked to the NCA6 Pm gene. aNCA6 Pm gene interval, bPm1 interval.