Pm23: a new allele of Pm4 located on chromosome 2AL in wheat.
Powdery mildew, caused by Blumeria graminis f. sp. tritici, is one of the major diseases of common wheat (Triticum aestivum) worldwide. The powdery mildew resistance gene Pm23, identified in the common wheat Line 81-7241 and originally assigned to wheat chromosome 5A, was relocated on chromosome 2AL with the aid of molecular markers. Mapping of microsatellite markers in two wheat crosses segregating for Pm23 and Pm4b, respectively, in combination with the reported mapping of Pm4a, indicated that the three genes were all linked to the marker Xgwm356 with a distance of 3-5 cM. Allelism between Pm4b and Pm23 was then confirmed, when the progenies of a cross between VPM1 (Pm4b) and Line 81-7241, were shown to be all resistant to a B. graminis isolate avirulent to the both parents. Pm23 is therefore a new allele of the Pm4 locus, and was redesignated as Pm4c.
Hao
Yuanfeng
Y
National Key Laboratory of Crop Biology, Taian Subcenter of National Wheat Improvement Center, College of Agronomy, Shandong Agricultural University, Taian, 271018, China. feng81_88@163.com
Liu
Aifeng
A
Wang
Yuhai
Y
Feng
Deshun
D
Gao
Jurong
J
Li
Xingfeng
X
Liu
Shubing
S
Wang
Honggang
H
D000483:Alleles; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D018744:DNA, Plant / Q000235:genetics; D017343:Genes, Plant; D018895:Microsatellite Repeats; D010935:Plant Diseases / Q000235:genetics; D014908:Triticum / Q000235:genetics* / Q000382:microbiology
D018744:DNA, Plant