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Genetic Analysis Using a Multi-Parent Wheat Population Identifies Novel Sources of Septoria Tritici Blotch Resistance
Riaz, Adnan KockAppelgren, Petra Hehir, James Gerard Kang, Jie Meade, Fergus Cockram, James Milbourne, Dan Spink, John Mullins, Ewen Byrne, Stephen
Riaz, Adnan
KockAppelgren, Petra
Hehir, James Gerard
Kang, Jie
Meade, Fergus
Cockram, James
Milbourne, Dan
Spink, John
Mullins, Ewen
Byrne, Stephen
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2020-08-04
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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. https://doi.org/10.3390/genes11080887
Abstract
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.