Virulence and diversity of<i>Puccinia striiformis</i>f. sp.<i>tritici</i>in Ethiopia

Dawit, Woubit; Flath, Kerstin; Weber, Wilhelm; Schümann, Erika; Kosman, Evsey

doi:10.1080/07060660909507594

Cited by 13 publications

(5 citation statements)

References 14 publications

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“…Stripe rust epidemics frequently occur in Ethiopia, but to our best knowledge, information on the resistance genes in Ethiopian landraces and cultivars is limited ( Hailu and Fininsa, 2007 ; Dawit et al, 2009 , 2012 ; Wan et al, 2016 ). In the current study, a survey for sources of resistance to contemporary Pst races from Ethiopia (PSTv-106 and PSTv-110) and the United States (PSTv-14, PSTv-37, PSTv-40, and PSTv-51) was evaluated in a panel of 182 durum wheat landraces and cultivars sampled from major wheat-growing areas of Ethiopia.…”

Section: Discussionmentioning

confidence: 99%

“…These newly documented loci represent 83.3 and 50.0% of total identified seedling and field resistance loci characterized in this GWAS. The historical isolation of Ethiopian durum wheat germplasm from the wheat currently under cultivation in other countries ( Tsegaye and Berg, 2007 ; Mengistu et al, 2016 ), combined with regular pressure from wheat rusts in this epidemic hot-spot area of East Africa ( Dawit et al, 2009 ; Wan et al, 2016 ) appears to have resulted in selection for unique diversity of stripe rust resistance genes.…”

Section: Discussionmentioning

confidence: 99%

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Novel Sources of Stripe Rust Resistance Identified by Genome-Wide Association Mapping in Ethiopian Durum Wheat (Triticum turgidum ssp. durum)

et al. 2017

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Stripe rust of wheat, caused by Puccinia striiformis f. sp. tritici (Pst), is a global concern for wheat production, and has been increasingly destructive in Ethiopia, as well as in the United States and in many other countries. As Ethiopia has a long history of stripe rust epidemics, its native wheat germplasm harbors potentially valuable resistance loci. Moreover, the Ethiopian germplasm has been historically underutilized in breeding of modern wheat worldwide and thus the resistance alleles from the Ethiopian germplasm represent potentially novel sources. The objective of this study was to identify loci conferring resistance to predominant Pst races in Ethiopia and the United States. Using a high-density 90 K wheat single nucleotide polymorphism array, a genome-wide association analysis (GWAS) was conducted on 182 durum wheat landrace accessions and contemporary varieties originating from Ethiopia. Landraces were detected to be more resistant at the seedling stage while cultivars were more resistant at the adult-plant stages. GWAS identified 68 loci associated with seedling resistance to one or more races. Six loci on chromosome arms 1AS, 1BS, 3AS, 4BL, and 5BL were associated with resistance against at least two races at the seedling stage, and five loci were previously undocumented. GWAS analysis of field resistance reactions identified 12 loci associated with resistance on chromosomes 1A, 1B, 2BS, 3BL, 4AL, 4B and 5AL, which were detected in at least two of six field screening nurseries at the adult-plant stage. Comparison with previously mapped resistance loci indicates that six of the 12 resistance loci are newly documented. This study reports effective sources of resistance to contemporary races in Ethiopia and the United States and reveals that Ethiopian durum wheat landraces are abundant in novel Pst resistance loci that may be transferred into adapted cultivars to provide resistance against Pst.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Novel Sources of Stripe Rust Resistance Identified by Genome-Wide Association Mapping in Ethiopian Durum Wheat (Triticum turgidum ssp. durum)

et al. 2017

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“…This finding confirms the hypothesis made by Wan et al (2017) that one field resistance QTL is linked with Yr17 . This hypothesis was based on their observation of much higher Yr17 virulence frequency of Ethiopian Pst races using Yr17 single‐gene lines (Wan et al, 2017) compared to using cultivar Rendezvous to represent Yr17 (Dawit et al, 2009). Thus, we conclude that Yr17 is tightly linked to another QTL that confers an APR reaction under field conditions.…”

Section: Discussionmentioning

confidence: 99%

Characterizing and Validating Stripe Rust Resistance Loci in US Pacific Northwest Winter Wheat Accessions (Triticum aestivumL.) by Genome‐wide Association and Linkage Mapping

Liu¹,

Naruoka

Miller³

et al. 2018

The Plant Genome

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Stripe rust resistance is a critical need for wheat cultivars in the US Pacific Northwest (PNW). Our previous genomewide association study (GWAS) for stripe rust resistance in a set of PNW winter wheat accessions (Panel-2) identified multiple marker-trait associations (MTAs) for both allstage and field resistance. In this study, we conducted additional GWAS using a different set of PNW winter wheat accessions (Panel-1) that contained recently bred soft white winter wheat breeding lines and cultivars. A total of 12 all-stage resistance MTAs and eight field resistance MTAs were identified. Within these MTAs, nine MTAs for all-stage resistance and two MTAs for field resistance were located distinctly from previously characterized genes and likely represent novel loci. Markers IWB60567 (1B), IWB24342 (2A), and IWB46564 (2B) explained the largest phenotypic variances for disease responses. The analysis confirmed that MTAs on chromosome 1B were indeed the same as Qyr.wpg-1B.2 identified in Panel-2 and that MTAs on chromosome 2A were likely Yr17 and closely linked to another field resistance QTL, Qyr.wpg-2A.2 (Panel-2). Haplotypes for MTAs on chromosome 1B, Yr17, and linked loci on chromosome 2A provide useful information for marker development and introgression of these QTL into wheat breeding programs.

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“…Puccinia striiformis isolates were derived from infected wheat leaves, which were submitted to or collected by the national yellow rust virulence survey programmes in France (de Vallavieille‐Pope et al ., ), the United Kingdom (UK Cereal Pathogen Virulence Survey; Bayles et al ., ), Germany (Dawit et al ., ), Poland and the Global Rust Reference Centre (GRRC) in Denmark (Hovmøller & Justesen, ). The number of samples submitted varied across years and countries, which reflected the national resources allocated for the survey or the significance of yellow rust disease in different years.…”

Section: Methodsmentioning

confidence: 99%

Replacement of the European wheat yellow rust population by new races from the centre of diversity in the near‐Himalayan region

et al. 2015

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Isolates of recently spreading races of yellow rust from wheat and triticale in Europe were analysed using virulence phenotypic data of 2605 isolates sampled in 12 countries between 2000 and 2014. A subset of 239 isolates was investigated by microsatellite markers. At least three races of non-European origin, termed 'Warrior', 'Kranich' and 'Triticale aggressive', were identified in the post-2011 population. The Warrior race was already present in high frequencies in the first year of detection in most European countries and to a large extent it replaced the pre-2011 European population. In contrast, the two other exotic races were localized to certain regions and/or crop type. The presence already of at least six multilocus genotypes of the Warrior race and five genotypes of the Kranich race in the first year of detection and across large areas is consistent with a hypothesis of aerial spread from genetically diverse source populations. A comparison with reference isolates sampled from six continents suggested that the Warrior and Kranich races originated from sexually recombining populations in the centre of diversity of the yellow rust fungus in the near-Himalayan region of Asia. However, the Triticale aggressive race was most similar to populations in the Middle East/Central Asia. The study illustrated the potential role of sexual Puccinia striiformis populations as a reservoir for new races replacing distant clonal populations.

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Virulence and diversity ofPuccinia striiformisf. sp.triticiin Ethiopia

Cited by 13 publications

References 14 publications

Novel Sources of Stripe Rust Resistance Identified by Genome-Wide Association Mapping in Ethiopian Durum Wheat (Triticum turgidum ssp. durum)

Novel Sources of Stripe Rust Resistance Identified by Genome-Wide Association Mapping in Ethiopian Durum Wheat (Triticum turgidum ssp. durum)

Characterizing and Validating Stripe Rust Resistance Loci in US Pacific Northwest Winter Wheat Accessions (Triticum aestivumL.) by Genome‐wide Association and Linkage Mapping

Replacement of the European wheat yellow rust population by new races from the centre of diversity in the near‐Himalayan region

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