A microsatellite map of wheat.
Hexaploid bread wheat (Triticum aestivum L. em. Thell) is one of the world's most important crop plants and displays a very low level of intraspecific polymorphism. We report the development of highly polymorphic microsatellite markers using procedures optimized for the large wheat genome. The isolation of microsatellite-containing clones from hypomethylated regions of the wheat genome increased the proportion of useful markers almost twofold. The majority (80%) of primer sets developed are genome-specific and detect only a single locus in one of the three genomes of bread wheat (A, B, or D). Only 20% of the markers detect more than one locus. A total of 279 loci amplified by 230 primer sets were placed onto a genetic framework map composed of RFLPs previously mapped in the reference population of the International Triticeae Mapping Initiative (ITMI) Opata 85 x W7984. Sixty-five microsatellites were mapped at a LOD >2.5, and 214 microsatellites were assigned to the most likely intervals. Ninety-three loci were mapped to the A genome, 115 to the B genome, and 71 to the D genome. The markers are randomly distributed along the linkage map, with clustering in several centromeric regions.
Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), 06466 Gatersleben, Germany. roder@ipk-gatesleben.de
M S
MS
Röder
V
V
Korzun
K
K
Wendehake
J
J
Plaschke
M H
MH
Tixier
P
P
Leroy
M W
MW
Ganal
D001483:Base Sequence; D002875:Chromosomes / Q000235:genetics; D017931:DNA Primers / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics / Q000302:isolation & purification; D015723:Gene Library; D008040:Genetic Linkage; D005821:Genetic Techniques; D018745:Genome, Plant; D018895:Microsatellite Repeats; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D015183:Restriction Mapping; D014908:Triticum / Q000235:genetics*
D017931:DNA Primers; D018744:DNA, Plant