Genetic analysis of seedling resistance to crown rust in five diploid oat (Avena strigosa) accessions

Cabral, Adrian L.; Park, Robert

doi:10.1007/s13353-015-0302-9

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…Indeed, more than 45 effective Pc genes were obtained from A. sterilis, including Pc38, Pc39, Pc68 and the majority of the APR genes. Several other wild oat species have been screened and used to identify new resistance genes (Aung et al, 2010;Cabral and Park, 2016;Cabral et al, 2011;Mitchell Fetch et al, 2007;Rooney et al, 1994). Recent sources of both racespecific and APR include A. strigosa, A. glabrota, A. trichophylla, A. longiglumus, A. magna and A. murphyi Sowa et al, 2016;USDA-ARS CDL, 2016); some of these sources originated from Moroccan and Israeli collections (Dinoor, 1970;Tan and Carson, 2013;Wahl, 1970).…”

Section: Finding New Sources Of Resistance Against Oat Crown Rustmentioning

confidence: 99%

Puccinia coronata f. sp. avenae: a threat to global oat production

Nazareno

Smith

et al. 2017

Molecular Plant Pathology

101

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Most crown rust management strategies involve the use of rust-resistant crop varieties and the application of fungicides. The attainment of the durability of resistance against Pca is difficult as it is a highly variable pathogen with a great propensity to overcome the genetic resistance of varieties. Thus, adult plant resistance is often exploited in oat breeding programmes to develop new crown rust-resistant varieties. Useful website: https://www.ars.usda.gov/midwest-area/st-paul-mn/cereal-disease-lab/docs/cereal-rusts/race-surveys/.

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Section: Finding New Sources Of Resistance Against Oat Crown Rustmentioning

confidence: 99%

Puccinia coronata f. sp. avenae: a threat to global oat production

Nazareno

Smith

et al. 2017

Molecular Plant Pathology

101

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“…A second study using SSRs showed that the A. strigosa accessions were 86% genetically similar, so this study may not be a true reflection of the genetic variability available in this species (Cabral et al 2013 ). The accessions proved to be very difficult to work with and very few introgression stocks could be produced (Aung et al 2010 ; Cabral et al 2011 ; Cabral and Park 2014 , 2016 ). Any attempt to introgress rust resistance from diploid or tetraploid Avena species to hexaploid oat, in the absence of transgenic approaches, will take at least 10 years to be of benefit to oat growers.…”

Section: Breeding For Resistance To P Coronata F S...mentioning

confidence: 99%

Breeding oat for resistance to the crown rust pathogen Puccinia coronata f. sp. avenae: achievements and prospects

et al. 2022

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Crown rust, caused by Puccinia coronata f. sp. avenae (Pca), is a significant impediment to global oat production. Some 98 alleles at 92 loci conferring resistance to Pca in Avena have been designated; however, allelic relationships and chromosomal locations of many of these are unknown. Long-term monitoring of Pca in Australia, North America and elsewhere has shown that it is highly variable even in the absence of sexual recombination, likely due to large pathogen populations that cycle between wild oat communities and oat crops. Efforts to develop cultivars with genetic resistance to Pca began in the 1950s. Based almost solely on all all-stage resistance, this has had temporary benefits but very limited success. The inability to eradicate wild oats, and their common occurrence in many oat growing regions, means that future strategies to control Pca must be based on the assumption of a large and variable prevailing pathogen population with high evolutionary potential, even if cultivars with durable resistance are deployed and grown widely. The presence of minor gene, additive APR to Pca in hexaploid oat germplasm opens the possibility of pyramiding several such genes to give high levels of resistance. The recent availability of reference genomes for diploid and hexaploid oat will undoubtedly accelerate efforts to discover, characterise and develop high throughput diagnostic markers to introgress and pyramid resistance to Pca in high yielding adapted oat germplasm.

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“…More than 45 effective Pc genes were obtained from A. sterilis, including Pc38, Pc39, Pc68, and 19 loci have been identified as derived from the diploid A. strigosa. Several other wild oat species have been screened and used to identify new resistance genes [16][17][18][19][20]. For example, in a test of 1,099 A. barbata accessions [21] from the Mediterranean region, 18 accessions were identified as sources of resistance at both seedling and adult stages.…”

Section: Introductionmentioning

confidence: 99%

Mapping crown rust resistance in the oat diploid accession PI 258731 (Avena strigosa)

Chowdhury,

Gordon,

Babar

et al. 2024

PLoS ONE

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Oat crown rust, caused by Puccinia coronata Corda f. sp. avenae Eriks. (Pca), is a major biotic impediment to global oat production. Crown rust resistance has been described in oat diploid species A. strigosa accession PI 258731 and resistance from this accession has been successfully introgressed into hexaploid A. sativa germplasm. The current study focuses on 1) mapping the location of QTL containing resistance and evaluating the number of quantitative trait loci (QTL) conditioning resistance in PI 258731; 2) understanding the relationship between the original genomic location in A. strigosa and the location of the introgression in the A. sativa genome; 3) identifying molecular markers tightly linked with PI 258731 resistance loci that could be used for marker assisted selection and detection of this resistance in diverse A. strigosa accessions. To achieve this, A. strigosa accessions, PI 258731 and PI 573582 were crossed to produce 168 F5:6 recombinant inbred lines (RILs) through single seed descent. Parents and RILs were genotyped with the 6K Illumina SNP array which generated 168 segregating SNPs. Seedling reactions to two isolates of Pca (races TTTG, QTRG) were conditioned by two genes (0.6 cM apart) in this population. Linkage mapping placed these two resistant loci to 7.7 (QTRG) to 8 (TTTG) cM region on LG7. Field reaction data was used for QTL analysis and the results of interval mapping (MIM) revealed a major QTL (QPc.FD-AS-AA4) for field resistance. SNP marker assays were developed and tested in 125 diverse A. strigosa accessions that were rated for crown rust resistance in Baton Rouge, LA and Gainesville, FL and as seedlings against races TTTG and QTRG. Our data proposed SNP marker GMI_ES17_c6425_188 as a candidate for use in marker-assisted selection, in addition to the marker GMI_ES02_c37788_255 suggested by Rine’s group, which provides an additional tool in facilitating the utilization of this gene in oat breeding programs.

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Genetic analysis of seedling resistance to crown rust in five diploid oat (Avena strigosa) accessions

Cited by 5 publications

References 33 publications

Puccinia coronata f. sp. avenae: a threat to global oat production

Puccinia coronata f. sp. avenae: a threat to global oat production

Breeding oat for resistance to the crown rust pathogen Puccinia coronata f. sp. avenae: achievements and prospects

Mapping crown rust resistance in the oat diploid accession PI 258731 (Avena strigosa)

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