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Open AccessArticle

Genetic Analysis Using a Multi-Parent Wheat Population Identifies Novel Sources of Septoria Tritici Blotch Resistance

1
Teagasc, Crop Science Department, Oak Park, R93 XE12 Carlow, Ireland
2
AgResearch, Invermay Agricultural Centre, Private Bag, Mosgiel 50034, New Zealand
3
Department of Mathematics and Statistics, University of Otago, Dunedin 9016, New Zealand
4
The John Bingham Laboratory, NIAB, Cambridge CB3 0LE, UK
*
Author to whom correspondence should be addressed.
Genes 2020, 11(8), 887; https://doi.org/10.3390/genes11080887
Received: 13 July 2020 / Revised: 31 July 2020 / Accepted: 31 July 2020 / Published: 4 August 2020
(This article belongs to the Special Issue Selection Methods in Plant Breeding: From Visual Phenotyping to NGS)
Zymoseptoria tritici is the causative fungal pathogen of septoria tritici blotch (STB) disease of wheat (Triticum aestivum L.) that continuously threatens wheat crops in Ireland and throughout Europe. Under favorable conditions, STB can cause up to 50% yield losses if left untreated. STB is commonly controlled with fungicides; however, a combination of Z. tritici populations developing fungicide resistance and increased restrictions on fungicide use in the EU has led to farmers relying on fewer active substances. Consequently, this serves to drive the emergence of Z. tritici resistance against the remaining chemistries. In response, the use of resistant wheat varieties provides a more sustainable disease management strategy. However, the number of varieties offering an adequate level of resistance against STB is limited. Therefore, new sources of resistance or improved stacking of existing resistance loci are needed to develop varieties with superior agronomic performance. Here, we identified quantitative trait loci (QTL) for STB resistance in the eight-founder “NIAB Elite MAGIC” winter wheat population. The population was screened for STB response in the field under natural infection for three seasons from 2016 to 2018. Twenty-five QTL associated with STB resistance were identified in total. QTL either co-located with previously reported QTL or represent new loci underpinning STB resistance. The genomic regions identified and the linked genetic markers serve as useful resources for STB resistance breeding, supporting rapid selection of favorable alleles for the breeding of new wheat cultivars with improved STB resistance. View Full-Text
Keywords: wheat; MAGIC population; septoria tritici blotch; genetic disease resistance; quantitative trait locus (QTL) mapping; SNP genotyping array; r/qtl2 wheat; MAGIC population; septoria tritici blotch; genetic disease resistance; quantitative trait locus (QTL) mapping; SNP genotyping array; r/qtl2
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Riaz, A.; KockAppelgren, P.; Hehir, J.G.; Kang, J.; Meade, F.; Cockram, J.; Milbourne, D.; Spink, J.; Mullins, E.; Byrne, S. Genetic Analysis Using a Multi-Parent Wheat Population Identifies Novel Sources of Septoria Tritici Blotch Resistance. Genes 2020, 11, 887.

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