Global Landscape of Rust Epidemics by Puccinia Species: Current and Future Perspectives

Figueroa, Melania; Dodds, Peter N.; Henningsen, Eva C; Sperschneider, Jana

doi:10.1007/978-3-031-16503-0_17

Cited by 7 publications

(3 citation statements)

References 192 publications

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“…The boom-and-bust cycle illustrates this process, as the pressure exerted by the extensive adoption of an oat cultivar with a disease resistance ( R ) gene leads to the selection of rare variants in the pathogen that can overcome that specific resistant trait. This results in a frequency increase of that virulence trait in the rust population (Figueroa et al 2023). Consequently, planting of that oat cultivar may become less common, as it is no longer resistant to the pathogen.…”

Section: Manuscript Bodymentioning

confidence: 99%

Virulence patterns of oat crown rust in Australia - season 2022

Henningsen,

Lewis,

Nguyen

et al. 2023

Preprint

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Puccinia coronataf. sp.avenae(Pca) is an important foliar pathogen of oat which causes crown rust disease. The virulence profile of 48Pcaisolates derived from different locations in Australia was characterised using a collection of oat lines often utilised in rust surveys in the USA and Australia. This analysis indicates thatPcapopulations in Eastern Australia are broadly virulent, in contrast to the population in Western Australia (WA). Several oat linesPcgenes are effective against all rust samples collected from WA, suggesting they may provide useful resistance in this region if deployed in combination. We identified 19 lines from the US oat differential set that display disease resistance toPcain WA, some in agreement with previous rust survey reports. We adopted the 10-letter nomenclature system to define oat crown rust races in Australia and compare the frequency of those virulence traits to published data from the USA. Based on this nomenclature, 42 unique races were detected among the 48 isolates, reflecting the high diversity of virulence phenotypes forPcain Australia. Nevertheless, thePcapopulation in the USA is substantially more broadly virulent than that of Australia. Close examination of resistance profiles for the oat differential set lines after infection with Pca supports hypotheses of allelism or redundancy amongPcgenes or the presence of severalRgenes in some oat differential lines. These findings illustrate the need to deconvolute the oat differential set using molecular tools.

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Section: Manuscript Bodymentioning

confidence: 99%

Virulence patterns of oat crown rust in Australia - season 2022

Henningsen,

Lewis,

Nguyen

et al. 2023

Preprint

Self Cite

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show abstract

“…The boom-and-bust cycle illustrates this process, as the pressure exerted by the extensive adoption of an oat cultivar with a disease resistance (R) gene leads to the selection of rare variants in the pathogen that can overcome that specific resistant trait. This results in a frequency increase of that virulence trait in the rust population (Figueroa et al 2023). Consequently, planting (which was not certified by peer review) is the author/funder.…”

Section: Manuscript Bodymentioning

confidence: 99%

Virulence Patterns of Oat Crown Rust in Australia – Season 2022

Henningsen,

Lewis,

Nguyen

et al. 2024

Plant Disease

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Puccinia coronata f. sp. avenae (Pca) is an important foliar pathogen of oat which causes crown rust disease. The virulence profile of 48 Pca isolates derived from different locations in Australia was characterised using a collection of oat lines often utilised in rust surveys in the USA and Australia. This analysis indicates that Pca populations in Eastern Australia are broadly virulent, in contrast to the population in Western Australia (WA). Several oat lines/Pc genes are effective against all rust samples collected from WA, suggesting they may provide useful resistance in this region if deployed in combination. We identified 19 lines from the USA oat differential set that display disease resistance to Pca in WA, some in agreement with previous rust survey reports. We adopted the 10-letter nomenclature system to define oat crown rust races in Australia and compare the frequency of those virulence traits to published data from the USA. Based on this nomenclature, 42 unique races were detected among the 48 isolates, reflecting the high diversity of virulence phenotypes for Pca in Australia. Nevertheless, the Pca population in the USA is substantially more broadly virulent than that of Australia. Close examination of resistance profiles for the oat differential set lines after infection with Pca supports hypotheses of allelism or redundancy among Pc genes or the presence of several resistance genes in some oat differential lines. These findings illustrate the need to deconvolute the oat differential set using molecular tools.

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“…Molecular evidence shows that sexuality is a clear driver of this rapid virulence evolution in USA populations and influences population structure in Sweden (Berlin et al ., 2018; Miller et al ., 2020; Hewitt et al ., 2023). However, asexual Pca populations have also been observed to gain virulence following R gene deployment (Nazareno et al ., 2018; Figueroa et al ., 2023). Like for other rusts, key aspects of Pca biology and epidemiology remain unclear.…”

Section: Introductionmentioning

confidence: 99%

A high-resolution haplotype pangenome uncovers somatic hybridization, recombination and intercontinental migration in oat crown rust

Henningsen,

Lewis,

Nazareno

et al. 2024

Preprint

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Basidiomycetes like rust fungi have complex reproductive cycles and dikaryotic life stages which influence their population structure and evolution.Puccinia coronataf. sp.avenae(Pca), the causal agent of oat crown rust, is a pathogen of global economic importance. To investigate the genetic diversity of the species, as well as the role of mating type system and nuclear exchange (somatic hybridization) in host adaptation ofPcawe acquired whole genome sequencing data of Taiwanese and Australian isolates, adding to existing data for USA and South African populations. An atlas of 30 chromosome-level, fully-phased nuclear haplotypes from six USA isolates and nine Australian isolates was generated to capture the genomic composition of key oat crown rust lineages. This study provides evidence of nuclear exchange and recombination of haplotypes in both the USA and AustralianPcapopulations as mechanisms for the introduction of genetic diversity. The limitations of assuming clonal evolutionary history from virulence phenotyping is demonstrated by the detection of either sexual or cryptic genetic recombination in thePcaAustralian population. Overall, the characterization of intercontinental migration ofPcaat the haplotype level provides further impetus for molecular monitoring of rust pathogen populations on a global scale.

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Global Landscape of Rust Epidemics by Puccinia Species: Current and Future Perspectives

Cited by 7 publications

References 192 publications

Virulence patterns of oat crown rust in Australia - season 2022

Virulence patterns of oat crown rust in Australia - season 2022

Virulence Patterns of Oat Crown Rust in Australia – Season 2022

A high-resolution haplotype pangenome uncovers somatic hybridization, recombination and intercontinental migration in oat crown rust

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