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Mapping of genomic regions linked to stemphylium blight (Stemphylium botryosum Wallr.) resistance in lentil using linkage mapping and marker-trait association analysis

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Abstract

Stemphylium blight caused by Stemphylium botryosum, is a foliar disease of lentil. It affects the productivity and milling quality of lentil crops, mainly in South Asia and Canada. Development of stemphylium blight resistant cultivars by introgression of resistance alleles from crop wild relatives of lentil, such as Lens ervoides, is one strategy of disease control. The objective of this study was to identify genomic regions associated with stemphylium blight resistance by combining linkage mapping and marker-trait association analysis. A total of 182 genotypes of a lentil advanced backcross population (LABC-01) developed from the backcross of the interspecific L. culinaris × L. ervoides line LR-59-81 (donor) and cultivar CDC Redberry (recurrent) and 101 diverse lentil accessions selected by stratified random sampling from a lentil diversity panel were genotyped and evaluated for stemphylium blight reactions. Quantitative trait locus (QTL) analysis identified four loci contributing to stemphylium blight resistance on lentil chromosomes 2, 4 and 5. Marker trait association analysis detected five significant single nucleotide polymorphism (SNP) markers associated with stemphylium blight resistance within QTLs regions and seven SNP markers outside the QTLs regions on chromosomes 1, 2, 3, 5, and 7. The markers associated with stemphylium blight resistance may be useful for marker-assisted selection of resistant cultivars after validation.

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Data availability

The raw genotypic datasets analyzed and presented in the current study are available at https://knowpulse.usask.ca upon request from the corresponding author.

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Acknowledgements

Special thank you to Brent Barlow and Kevin Mikituk for technical assistance in the field. We appreciate the Pulse Crop Genetics and Breeding lab members Akiko Tomita and Robert Stonehouse for their assistance with exome capture library preparation for sequencing. We thank Larrisa Ramsay and Carolyn Caron for assistance on bioinformatics. We are also grateful for genetic resources made available from the ‘Application of Genomics to Innovation in Lentil Economy (AGILE)’ project. We acknowledged funding from the Saskatchewan Pulse Growers and the Agricultural Development Fund of the Saskatchewan Ministry of Agriculture.

Funding

Saskatchewan Pulse Growers and the Agricultural Development Fund of the Saskatchewan Ministry of Agriculture.

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All authors contributed to the study design. SA and TSG performed the experiments and data collection. SA analyzed the data and wrote the first draft of the manuscript. SB, TSG, AV advised on the materials and methods, results and discussions. All authors reviewed and approved the final manuscript.

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Correspondence to Stanley Adobor.

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The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Adobor, S., Gela, T.S., Banniza, S. et al. Mapping of genomic regions linked to stemphylium blight (Stemphylium botryosum Wallr.) resistance in lentil using linkage mapping and marker-trait association analysis. Euphytica 219, 86 (2023). https://doi.org/10.1007/s10681-023-03215-z

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  • DOI: https://doi.org/10.1007/s10681-023-03215-z

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