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Unveiling the predominance of Saccharum spontaneum alleles for resistance to orange rust in sugarcane using genome-wide association

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Abstract

Key message

Six QTLs of resistance to sugarcane orange rust were identified in modern interspecific hybrids by GWAS. For five of them, the resistance alleles originated from S. spontaneum. Altogether, they efficiently predict disease resistance.

Abstract

Sugarcane orange rust (SOR) is a threatening emerging disease in many sugarcane industries worldwide. Improving the genetic resistance of commercial cultivars remains the most promising solution to control this disease. In this study, an association panel of 568 modern interspecific sugarcane hybrids (Saccharum officinarum x S. spontaneum) from Réunion’s breeding program was evaluated for its resistance to SOR under natural conditions of infection. Two genome-wide association studies (GWAS) were conducted between disease reactions and 183,842 single nucleotide polymorphism (SNP) markers obtained by targeted genotyping-by-sequencing. Five resistance quantitative trait loci (QTLs), named Oru1, Oru2, Oru3, Oru4 and Oru5, were identified using a single-locus GWAS (SL-GWAS). These five QTLs all originated from the species S. spontaneum. A multi-locus GWAS (ML-GWAS) uncovered an additional but less significant resistance QTL named Oru6, which originated from S. officinarum. All six QTLs had a moderate to major phenotypic effect on disease resistance. Prediction accuracy estimated with linear regression models based on each of the five QTLs identified by SL-GWAS was between 0.16-0.41. Altogether, these five QTLs provided a relatively high prediction accuracy of 0.60. In comparison, accuracies obtained with six genome-wide prediction models (i.e., GBLUP, Bayes-A, Bayes-B, Bayes-C, Bayesian Lasso and RKHS) reached only 0.65. The good prediction accuracy of disease resistance provided by the QTLs and the predominant S. spontaneum origin of their resistance alleles pave the way for effective marker-assisted breeding strategies.

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Data and material available upon reasonable request to the corresponding author.

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Acknowledgements

The authors wish to thank the technical staff members of eRcane (F. Poiny, D. Vaitilingom, A. Corre, G. Morel and C. Sautron) for the management of the field experiments. The participation of M. Paysan and C. Legrand in disease assessment in the sugarcane fields is also highly appreciated. The authors also wish to thank M. Vitrac for providing some of the S. officinarum accessions.

Funding

This work was funded by the company eRcane through the AGIV project and by ANRT (Association Nationale de la Recherche et de la Technologie) through the CIFRE PhD grant N° 2021/0634 of J. Dijoux.

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JD, JYH, LB, PR and TD designed the phenotyping methodology. JD, JYH and TD acquired the phenotypic data. JD, JYH, SR and TD performed statistical analyses of the phenotypic data. CH performed Bru 1 diagnoses and prepared the DNA samples. OG and SR pre-treated raw sequencing data. JD, JYH and SR performed association studies and genomic prediction analyses. JYH conceived and supervised the AGIV project. JYH, ADH and PR supervised JD’s PhD. LB supervised the technical management of the experiments. JD, JYH, SR and TD wrote the original draft. ADH, OG and PR reviewed and edited the manuscript. All authors have read and approved the manuscript.

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Correspondence to Jean-Yves Hoarau.

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Communicated by Lee Hickey.

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Dijoux, J., Rio, S., Hervouet, C. et al. Unveiling the predominance of Saccharum spontaneum alleles for resistance to orange rust in sugarcane using genome-wide association. Theor Appl Genet 137, 81 (2024). https://doi.org/10.1007/s00122-024-04583-3

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  • DOI: https://doi.org/10.1007/s00122-024-04583-3

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