Identification of novel quantitative trait loci for resistance to Fusarium seedling blight caused by Microdochium majus and M. nivale in wheat

Ren, Runsheng; Foulkes, John; Mayes, Sean; Yang, Xingping; Ray, Rumiana V.

Abstract

Microdochium nivale and Microdochium majus are important causal agents of Fusarium seedling blight (FSB) and Fusarium head blight (FHB) in wheat and other cereals worldwide. A doubled-haploid population derived from a cross between the winter wheat Rialto and a CIMMYT spring wheat advanced line LSP2, differing in susceptibility to FSB and FHB, was assessed for resistance against the diseases caused by individual Microdochium species under controlled environment and field conditions. A linkage map constructed with DArT and SSR markers was used to identify quantitative trait loci (QTLs) for resistance against the FSB and FHB. Single, major QTLs for resistance to FSB caused by M. majus and M. nivale were found on the chromosomes 1AL and 2BS, respectively. The total phenotypic variation accounted for by the individual QTLs ranged from 42.2% to 57.7% depending on the causal organism of the disease. QTLs for emergence rate of infected seeds with both Microdochium species were also identified on chromosomes 1B and 2DS. Three QTLs conferring FHB resistance to M. majus were mapped on chromosomes 1D, 4B and 5A, explaining a total of 35.1% of the phenotypic variance. One QTL conferring FHB resistance to M. nivale was detected on chromosome 6B and accounted for 20.7% of the total phenotypic variance. We show that QTLs for resistance to FSB and FHB caused by M. majus and M. nivale are different and likely to be species-specific, suggesting that improved resistance to the diseases of the Fusarium complex can be achieved by combining their effects through crop breeding.

Citation

Ren, R., Foulkes, J., Mayes, S., Yang, X., & Ray, R. V. (2016). Identification of novel quantitative trait loci for resistance to Fusarium seedling blight caused by Microdochium majus and M. nivale in wheat. Field Crops Research, 191, 1-12. https://doi.org/10.1016/j.fcr.2016.03.011

• Journal Article Type: Article
• Acceptance Date: Mar 24, 2016
• Online Publication Date: Apr 3, 2016
• Publication Date: May 1, 2016
• Deposit Date: Aug 18, 2018
• Journal: Field Crops Research
• Print ISSN: 0378-4290
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 191
• Pages: 1-12
• DOI: https://doi.org/10.1016/j.fcr.2016.03.011
• Public URL: https://nottingham-repository.worktribe.com/output/1108648