Genetic mapping of the wheat leaf rust resistance gene Lr2a and its importance in Canadian wheat cultivars

Thambugala, Dinushika; Lewarne, Mallorie K.; McCallum, Brent D.; Bilichak, Andriy; Hiebert, Colin W.; McCartney, Curt A.

doi:10.1007/s00122-023-04440-9

Theor Appl Genet

2023

DOI: 10.1007/s00122-023-04440-9

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Genetic mapping of the wheat leaf rust resistance gene Lr2a and its importance in Canadian wheat cultivars

Dinushika Thambugala,

Mallorie K. Lewarne,

Brent D. McCallum

et al.

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2024

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Characterization of Quantitative Trait Loci for Leaf Rust Resistance in the Uzbekistani Wheat Landrace Teremai Bugdai

Xu,

Li,

Bai

et al. 2024

Phytopathology®

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Leaf rust, caused by Puccinia triticina Eriks. (Pt), is a major cause of wheat yield losses globally, and novel leaf rust resistance genes are needed to enhance wheat leaf rust resistance. Teremai Bugdai is a landrace from Uzebekistan that is highly resistant to many current races of Pt in the U.S.A. To unravel leaf rust resistance loci in Teremai Bugdai, a recombinant inbred line (RIL) population of Teremai Bugdai × TAM 110 was evaluated for response to Pt race Pt54-1 (TNBGJ) and genotyped using single nucleotide polymorphism (SNP) markers generated by genotyping-by-sequencing (GBS). Quantitative trait loci (QTL) analysis using 5,130 high quality GBS-SNPs revealed three QTLs, QLr-Stars-2DS, QLr-Stars-6BL, and QLr.stars-7BL, for leaf rust resistance in two experiments. QLr-Stars-2DS, which is either a new Lr2 allele or a new resistance locus, was delimited to a ~ 19.47 Mb interval between 46.4 Mb and 65.9 Mb on 2DS and explained 31.3% and 33.2% of the phenotypic variance in the two experiments. QLr-Stars-6BL was mapped in a ~84.0 Kb interval between 719.48 Mb and 719.56 Mb on 6BL, accounting for 33% to 36.8% of the phenotypic variance in two experiments. QLr.stars-7BL was placed in a 350 Kb interval between 762.41 Mb and 762.76 Mb on 7BL and explained 4.4% to 5.3% of the phenotypic variance. Nine GBS-SNPs flanking these QTLs were converted to kompetitive allele specific PCR (KASP) markers and these markers can be used to facilitate their introgression into locally adapted wheat lines.

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Characterization of Quantitative Trait Loci for Leaf Rust Resistance in the Uzbekistani Wheat Landrace Teremai Bugdai

Xu,

Li,

Bai

et al. 2024

Phytopathology®

View full text Add to dashboard Cite

show abstract

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Genetic mapping of the wheat leaf rust resistance gene Lr2a and its importance in Canadian wheat cultivars

Cited by 1 publication

References 47 publications

Characterization of Quantitative Trait Loci for Leaf Rust Resistance in the Uzbekistani Wheat Landrace Teremai Bugdai

Characterization of Quantitative Trait Loci for Leaf Rust Resistance in the Uzbekistani Wheat Landrace Teremai Bugdai

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