Mutations in wheat exhibiting growth-stage-specific resistance to biotrophic fungal pathogens.
Two mutants were isolated in wheat that showed enhanced resistance towards Puccinia striiformis f. sp. tritici, the fungal causal agent of yellow rust. The altered phenotype of I3-48 is due to a minimum of two mutation events, each showing a partial, additive effect, with one mutation segregating with a deletion on the long arm of chromosome 4D. In the case of I3-54, the enhanced resistance is due to a single, dominant mutation. In both mutants, the expression of the enhanced resistance is growth-stage specific. With I3-54, the full resistance phenotype is apparent from the third seedling leaf onwards, while with I3-48, a full resistance phenotype is only seen on the tenth and subsequent leaves. In addition to the enhanced resistance towards yellow rust, I3-48 also shows enhanced resistance towards brown rust, and I3-54 shows enhanced resistance to powdery mildew.
Smith
Phil H
PH
Department of Disease and Stress Biology, John Innes Centre, Colney Lane, Norwich Research Park, Norwich, NR4 7UH, UK.
Howie
John A
JA
Worland
Anthony J
AJ
Stratford
Rebecca
R
Boyd
Lesley A
LA
D001487:Basidiomycota / Q000472:pathogenicity*; D002874:Chromosome Mapping; D004198:Disease Susceptibility; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D009154:Mutation; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics / Q000382:microbiology; D018515:Plant Leaves / Q000382:microbiology; D011123:Polyploidy; D014908:Triticum / Q000235:genetics* / Q000382:microbiology*