Abstract
Stripe rust caused by the biotrophic fungus Puccinia striiformis Westend. is one of the most important diseases of wheat worldwide, causing high yield and quality losses. Growing resistant cultivars is the most efficient way to control stripe rust, both economically and ecologically. Known resistance genes are already present in numerous cultivars worldwide. However, their effectiveness is limited to certain races within a rust population and the emergence of stripe rust races being virulent against common resistance genes forces the demand for new sources of resistance. Multiparent advanced generation intercross (MAGIC) populations have proven to be a powerful tool to carry out genetic studies on economically important traits. In this study, interval mapping was performed to map quantitative trait loci (QTL) for stripe rust resistance in the Bavarian MAGIC wheat population, comprising 394 F6 : 8 recombinant inbred lines (RILs). Phenotypic evaluation of the RILs was carried out for adult plant resistance in field trials at three locations across three years and for seedling resistance in a growth chamber. In total, 21 QTL for stripe rust resistance corresponding to 13 distinct chromosomal regions were detected, of which two may represent putatively new QTL located on wheat chromosomes 3D and 7D.
Highlights
The biotrophic fungus Puccinia striiformis Westend. f. sp. tritici Eriks. is the causal agent of stripe rust and is one of the most important foliar diseases of wheat, which accounted for 25% of global cereal crop production in 2018 (Food and Agriculture Organization of the United Nations (FAO), 2020)
Yr5, Yr7, Yr10, Yr15, Yr18, Yr36, Yr46, and YrSP have already been cloned and characterized as intracellular nucleotide-binding leucinerich-repeat receptors (Yr5, Yr7, and YrSP), putative kinasepseudokinase protein (Yr15), transporters (Yr18 and Yr46), or wheat kinase start 1 (Yr36) (Fu et al, 2009; Krattinger et al, 2009; Liu et al, 2014; Moore et al, 2015; Klymiuk et al, 2018; Marchal et al, 2018). Resistance genes, such as YrAS2388R derived from Aegilops tauschii and YrU1 derived from Triticum urartu have recently been cloned, encoding a nucleotide oligomerization domain-like receptor (NLR) and a coiled-coil-NBS-leucine-rich repeat protein with N-terminal ankyrin-repeat and C-terminal WRKY domains, respectively (Zhang et al, 2019; Wang et al, 2020)
Known stripe rust resistances are present in many cultivars; their effectiveness is limited to certain races within the rust population in accordance with the gene-for-gene hypothesis (Flor, 1971)
Summary
The biotrophic fungus Puccinia striiformis Westend. f. sp. tritici Eriks. is the causal agent of stripe rust and is one of the most important foliar diseases of wheat, which accounted for 25% of global cereal crop production in 2018 (Food and Agriculture Organization of the United Nations (FAO), 2020). Is the causal agent of stripe rust and is one of the most important foliar diseases of wheat, which accounted for 25% of global cereal crop production in 2018 (Food and Agriculture Organization of the United Nations (FAO), 2020). Prevalent in the temperate and maritime wheat growing regions, stripe rust can cause yield losses up to 70% mainly by reducing photosynthesis and taking assimilates from the host plant (Chen, 2005; Jagger et al, 2011; Rosewarne et al, 2012). The application of fungicides, as well as the growing of resistant cultivars are currently used to control stripe rust, of which the latter is the most. Stripe Rust Resistance in Wheat economically safe and environmentally friendly approach to avoid yield losses. Resistance genes, such as YrAS2388R derived from Aegilops tauschii and YrU1 derived from Triticum urartu have recently been cloned, encoding a nucleotide oligomerization domain-like receptor (NLR) and a coiled-coil-NBS-leucine-rich repeat protein with N-terminal ankyrin-repeat and C-terminal WRKY domains, respectively (Zhang et al, 2019; Wang et al, 2020)
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