Summary
This research identified and functionally validated AstNLR94, a zinc finger BED-domain NLR gene underlying the Pc94 crown rust resistance locus in oat (Avena spp.), through integration of QTL analysis, genome assembly, and mutagenesis. The authors characterised the diversity of Pc94 introgressions in cultivated oat and developed a diagnostic molecular marker for marker-assisted selection, clarifying the genetic architecture of this durable resistance trait and providing practical tools for cultivar development.
Regional applicability
Crown rust is a significant disease threat to oat production in temperate regions, including the United Kingdom, making disease resistance breeding of direct relevance. The marker and resistance gene identified will be transferable to UK oat breeding programmes, though the specific introgression backgrounds may differ from UK germplasm and local pathotype prevalence should be confirmed.
Key measures
QTL mapping on chromosome 7A; presence/absence allele-specific PCR marker accuracy and specificity; introgression size (1.7–71 Mbp) and chromosomal location in A. sativa; minor QTL on chromosome 4A
Outcomes reported
The study identified and characterised the Pc94 crown rust resistance locus in oat through QTL analysis and genome assembly, determining that a single NLR gene with an integrated zinc finger BED domain (AstNLR94) is necessary for resistance. An allele-specific PCR marker was developed for marker-assisted selection and introgression sizes and locations in cultivated oat were mapped.
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