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Genome-wide association study for an efficient selection of Fusarium head blight resistance in winter triticale

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Abstract

Fusarium head blight (FHB) is one of the most serious diseases in small-grain cereals including triticale (× Triticosecale Wittmack). The disease reduces yield and accumulates mycotoxins which are harmful to human and animal health. Triticale grain is almost exclusively used on-farm in feed formulations for swine and other animals, and swine is the most susceptible farm animal to Fusarium mycotoxins. In order to evaluate the potential of genomics-assisted breeding to FHB, we performed the first genome-wide association study for FHB resistance in triticale. QTL for FHB resistance were identified on chromosomes 2A, 2B, 5B and 3R with an explained genotypic variance ranging from 0.28 to 30.23% and a total explained genetic variance of 56.64%. A QTL on chromosome 3R that explained 15.38% of the genotypic variance was identified for the first time. Association mapping was complemented by genome-wide prediction, which yielded a high prediction accuracy of 0.78 for FHB resistance when weighted genomic selection was performed. Collectively our findings highlight the potential of genomics-assisted approaches to improve Fusarium resistance in triticale in early generations.

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Abbreviations

BLUEs:

Best linear unbiased estimators

DON:

Deoxynivalenol

FHB:

Fusarium head blight

FT:

Flowering time

GEBV:

Genomic estimated breeding value

GS:

Genomic selection

GWA:

Genome-wide association

K:

Kinship

MAF:

Minor allele frequency

MAS:

Marker-assisted selection

NIV:

Nivalenol

PCA:

Principal component analysis

PH:

Plant height

QTL:

Quantitative trait loci

RR-BLUP:

Ridge-regression BLUP

wRR-BLUP:

Weighted ridge-regression BLUP

ZON:

Zearalenone

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Acknowledgements

The molecular marker data was funded by the Federal Ministry of Food and Agriculture (BMEL) through its project management body Fachagentur für Nachwachsende Rohstoffe e.V. (FNR) (Grants: 22406112, 22406212, 22406312, and 22406412). We thank the Federal Ministry of Food and Agriculture (BMEL) based on a decision of the Parliament of the Federal Republic of Germany via the Federal Office for Agriculture and Food (BLE) under the innovation support program within the PRIMA cooperative project (Grant No. 2818202815) for financially supporting the first author of this project. The authors also would like to thank Tizian Zollinger for the collection of phenotypic data within his master thesis and Dr. S. Weissmann, HegeSaat GmbH & Co. KG, Singen, for providing genotypes. We highly appreciate the excellent technical support of the teams at Hohenheim and Oberer Lindenhof.

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Correspondence to Thomas Miedaner.

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The authors declare that the experiments comply with the current laws of Germany.

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Galiano-Carneiro, A.L., Boeven, P.H.G., Maurer, H.P. et al. Genome-wide association study for an efficient selection of Fusarium head blight resistance in winter triticale. Euphytica 215, 4 (2019). https://doi.org/10.1007/s10681-018-2327-8

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  • DOI: https://doi.org/10.1007/s10681-018-2327-8

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