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Fine mapping of QPm.caas-3BS, a stable QTL for adult-plant resistance to powdery mildew in wheat (Triticum aestivum L.)

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Abstract

Key message

A stable QTL QPm.caas-3BS for adult-plant resistance to powdery mildew was mapped in an interval of 431 kb, and candidate genes were predicted based on gene sequences and expression profiles.

Abstract

Powdery mildew is a devastating foliar disease occurring in most wheat-growing areas. Characterization and fine mapping of genes for powdery mildew resistance can benefit marker-assisted breeding. We previously identified a stable quantitative trait locus (QTL) QPm.caas-3BS for adult-plant resistance to powdery mildew in a recombinant inbred line population of Zhou8425B/Chinese Spring by phenotyping across four environments. Using 11 heterozygous recombinants and high-density molecular markers, QPm.caas-3BS was delimited in a physical interval of approximately 3.91 Mb. Based on re-sequenced data and expression profiles, three genes TraesCS3B02G014800, TraesCS3B02G016800 and TraesCS3B02G019900 were associated with the powdery mildew resistance locus. Three gene-specific kompetitive allele-specific PCR (KASP) markers were developed from these genes and validated in the Zhou8425B derivatives and Zhou8425B/Chinese Spring population in which the resistance gene was mapped to a 0.3 cM interval flanked by KASP14800 and snp_50465, corresponding to a 431 kb region at the distal end of chromosome 3BS. Within the interval, TraesCS3B02G014800 was the most likely candidate gene for QPm.caas-3BS, but TraesCS3B02G016300 and TraesCS3B02G016400 were less likely candidates based on gene annotations and sequence variation between the parents. These results not only offer high-throughput KASP markers for improvement of powdery mildew resistance but also pave the way to map-based cloning of the resistance gene.

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Data availability

The authors declare that all data and materials support their published claims and comply with field standards.

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The authors declare that software application or custom code supports their published claims and complies with field standards.

Abbreviations

APR:

Adult-plant resistance

ASR:

All-stage resistance

Bgt :

Blumeria graminis f. sp. tritici

BLUE:

Best linear unbiased estimate

FPKM:

Fragments per kilobase per million reads

KASP:

Kompetitive allele-specific PCR

MDS:

Maximum disease severity

NIL:

Near-isogenic line

PCR:

Polymerase chain reaction

qPCR:

Quantitative real-time PCR

QTL:

Quantitative trait locus

RIL:

Recombinant inbred line

SNP:

Single nucleotide polymorphism

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Acknowledgements

The authors are grateful to Prof. R. A. McIntosh, Plant Breeding Institute, University of Sydney, for critical review of this manuscript. This study was supported by the National Natural Science Foundation of China (31961143007, U1904109), Henan Science and Technology Foundation (202102110016) and CAAS Science and Technology Innovation Program.

Funding

This study was supported by the National Natural Science Foundation of China (31961143007, U1904109), Henan Science and Technology Foundation (202102110016) and CAAS Science and Technology Innovation Program.

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Authors and Affiliations

Authors

Contributions

Y. Dong performed the experiments and data analyses and wrote the paper. D. A. Xu analyzed the RNA-Seq data. F. M. Gao analyzed the re-sequenced data of Zhou8425B. X. W. Xu, Y. Ren, J. Song, A. L. Jia and Y. F. Hao participated in the field trials. Z. H. He and X. C. Xia designed the experiment and assisted in writing the paper. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Xianchun Xia.

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Conflict of interest

The authors declare that they have no competing interests.

Ethical approval

We declare that these experiments complied with the ethical standards in China.

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Communicated by Beat Keller.

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Dong, Y., Xu, D., Xu, X. et al. Fine mapping of QPm.caas-3BS, a stable QTL for adult-plant resistance to powdery mildew in wheat (Triticum aestivum L.). Theor Appl Genet 135, 1083–1099 (2022). https://doi.org/10.1007/s00122-021-04019-2

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  • DOI: https://doi.org/10.1007/s00122-021-04019-2

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