Recent insights into barley and <i>Rhynchosporium commune</i> interactions

Zhang, Xuechen; Ovenden, Ben; Milgate, Andrew

doi:10.1111/mpp.12945

Cited by 21 publications

(44 citation statements)

References 119 publications

(178 reference statements)

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“…In 18 families the resistance score is improved by more than 0.5 scoring units. Around 50 QTLs are described on 3H, most of them in the region of Rrs1 (reviewed in [68]). Rrs1 was linked repeatedly to marker MWG680 [20,26,39,69,70] and the marker 11_0315 is derived from the same SNP [22].…”

Section: Chromosome 3hmentioning

confidence: 99%

Identification of QTLs conferring resistance to scald (Rhynchosporium commune) in the barley nested association mapping population HEB-25

et al. 2020

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Background Barley scald, caused by the fungus Rhynchosporium commune, is distributed worldwide to all barley growing areas especially in cool and humid climates. Scald is an economically important leaf disease resulting in yield losses of up to 40%. To breed resistant cultivars the identification of quantitative trait loci (QTLs) conferring resistance to scald is necessary. Introgressing promising resistance alleles of wild barley is a way to broaden the genetic basis of scald resistance in cultivated barley. Here, we apply nested association mapping (NAM) to map resistance QTLs in the barley NAM population HEB-25, comprising 1420 lines in BC1S3 generation, derived from crosses of 25 wild barley accessions with cv. Barke. Results In scald infection trials in the greenhouse variability of resistance across and within HEB-25 families was found. NAM based on 33,005 informative SNPs resulted in the identification of eight reliable QTLs for resistance against scald with most wild alleles increasing resistance as compared to cv. Barke. Three of them are located in the region of known resistance genes and two in the regions of QTLs, respectively. The most promising wild allele was found at Rrs17 in one specific wild donor. Also, novel QTLs with beneficial wild allele effects on scald resistance were detected. Conclusions To sum up, wild barley represents a rich resource for scald resistance. As the QTLs were linked to the physical map the identified candidate genes will facilitate cloning of the scald resistance genes. The closely linked flanking molecular markers can be used for marker-assisted selection of the respective resistance genes to integrate them in elite cultivars.

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Section: Chromosome 3hmentioning

confidence: 99%

Identification of QTLs conferring resistance to scald (Rhynchosporium commune) in the barley nested association mapping population HEB-25

et al. 2020

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“…Currently, there are multiple rhynchosporium resistance genes that are spread across all barley chromosomes, except 5H (Hanemann 2009;Zhang et al 2020). The identification of new resistance genes that can be introgressed into elite lines could help make a more robust resistance.…”

Section: Discussionmentioning

confidence: 99%

“…The dotted line denotes a significance threshold of a p value < 0.0001 2008). Additionally, the region identified in 2HL has not had any QTLs associated with rhynchosporium resistance (Zhang et al 2020). However, Büttner et al (2020 have recently identified a QTL in a similar location on 5HL as the one found in this study, further suggesting a potential novel source of resistance.…”

Section: Discussionmentioning

confidence: 99%

Identifying potential novel resistance to the foliar disease ‘Scald’ (Rhynchosporium commune) in a population of Scottish Bere barley landrace (Hordeum vulgare L.)

et al. 2021

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Barley ‘Scald’ is an economically damaging fungal disease that is a global problem, causing significant yield and economical losses in the UK barley feed and malting industries. Presently, a limited number of Rhynchosporium resistance genes exist, but selective pressures on the fungi cause the demand for new sources of resistance. Landraces, such as the Scottish Bere barley, hold potential sources of resistance that can be utilised, with farmers providing anecdotal evidence of resistance in field populations of Bere. This study analysed 131 heritage cultivars and landrace lines, including 37 Bere lines, to screen for resistance using both detached leaf assays (DLAs) and field experiments. Results showed that Bere lines produced smaller, but more necrotic, lesions for the majority of isolates in the DLAs, as well as smaller scores when visually assessed in field conditions. Whilst the infection patterns of the lines differed between isolates and experimental conditions, three Bere lines were identified as consistently showing reduced levels of infection (45 A 23, 58 A 36 Eday, and 8-125). Using genome-wide association analysis, we were able to identify a number of genomic regions associated with reduced infection symptoms, four in regions associated with known resistance genes, but another four associated with new regions that contain promising candidate genes. Further analysis of these new regions and candidate genes should be undertaken to identify targets for future disease-resistance breeding.

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“…nov. (formerly: R. secalis (Oudem.) J.J. Davis) (Zaffarano et al 2011) is one of the most important diseases worldwide (Avrova and Knogge 2012;Zhang et al 2020). The name R. graminicola Heinsen 1897 is also suggested to be used as a replacing synonym for R. commune due to its longer history (Crous et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…So far, 148 quantitative trait loci (QTL) for scald resistance have been reported in barley (reviewed in Zhang et al 2020) including the following major resistance genes (R-genes): Rrs14 on chromosome 1H, Rrs17 on 2H, Rrs1 and Rrs4 on 3H, Rrs16 on 4H, Rrs13 and Rrs18 on 6H, Rrs2, Rrs 12, Rrs15, on 7H. R. commune is a genetically highly diverse pathogen (Abang et al 2006;McDonald 2015), which emphasizes the importance of using partial resistance over single R-genes and also the need to find new resistance mechanisms to replace the ones that are already overcome by pathogen evolution.…”

Section: Introductionmentioning

confidence: 99%

Pyramiding of scald resistance genes in four spring barley MAGIC populations

Veteläinen¹,

Manninen²,

Isolahti³

et al. 2021

Theor Appl Genet

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Genome-Wide Association Studies (GWAS) of four Multi-parent Advanced Generation Inter-Cross (MAGIC) populations identified nine regions on chromosomes 1H, 3H, 4H, 5H, 6H and 7H associated with resistance against barley scald disease. Three of these regions are putatively novel resistance Quantitative Trait Loci (QTL). Barley scald is caused by Rhynchosporium commune, one of the most important barley leaf diseases that are prevalent in most barley-growing regions. Up to 40% yield losses can occur in susceptible barley cultivars. Four MAGIC populations were generated in a Nordic Public–Private Pre-breeding of spring barley project (PPP Barley) to introduce resistance to several important diseases. Here, these MAGIC populations consisting of six to eight founders each were tested for scald resistance in field trials in Finland and Iceland. Eight different model covariate combinations were compared for GWAS studies, and the models that deviated the least from the expected p-values were selected. For all QTL, candidate genes were identified that are predicted to be involved in pathogen defence. The MAGIC progenies contained new haplotypes of significant SNP-markers with high resistance levels. The lines with successfully pyramided resistance against scald and mildew and the significant markers are now distributed among Nordic plant breeders and will benefit development of disease-resistant cultivars.

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Recent insights into barley and Rhynchosporium commune interactions

Cited by 21 publications

References 119 publications

Identification of QTLs conferring resistance to scald (Rhynchosporium commune) in the barley nested association mapping population HEB-25

Identification of QTLs conferring resistance to scald (Rhynchosporium commune) in the barley nested association mapping population HEB-25

Identifying potential novel resistance to the foliar disease ‘Scald’ (Rhynchosporium commune) in a population of Scottish Bere barley landrace (Hordeum vulgare L.)

Pyramiding of scald resistance genes in four spring barley MAGIC populations

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