Prevalence of QoI resistance and mtDNA diversity in the Irish Zymoseptoria tritici population
MetadataShow full item record
StatisticsDisplay Item Statistics
CitationKildea, S., Bucar, D..E., Hutton, F., Rosa, S., Welch, T..E., & Phelan, S. (2019). Prevalence of QoI resistance and mtDNA diversity in the Irish Zymoseptoria tritici population, Irish Journal of Agricultural and Food Research, 58(1), 27-33. doi: https://doi.org/10.2478/ijafr-2019-0004
AbstractThe emergence and spread of Quinone outside Inhibitor (QoI) fungicide resistance in the Irish Zymoseptoria tritici population in the early 2000s had immediate impacts on the efficacy of the entire group of fungicides for the control of septoria tritici blotch. As a result, a dramatic reduction in the quantities applied to winter wheat occurred in the following seasons. Even in the absence of these fungicides, the frequency of the resistance allele, G143A in the pathogens mtDNA has remained exceptionally high (>97%), and as such, it can be anticipated that continued poor efficacy of current QoI fungicides will be observed. Amongst the isolates with G143A, differences in sensitivity to the QoI pyraclostrobin were observed in vitro. The addition of the alternative oxidase (AOX) inhibitor salicylhydroxamic acid increased sensitivity in these isolates, suggesting some continued impairment of respiration by the QoI fungicides, albeit weak. Interestingly, amongst those tested, the strains from a site with a high frequency of inserts in the MFS1 transporter gene known to enhance QoI efflux did not exhibit this increase in sensitivity. A total of 19 mtDNA haplotypes were detected amongst the 2017 strain collection. Phylogenetic analysis confirmed the suggestion of a common ancestry of all the haplotypes, even though three of the haplotypes contained at least one sensitive strain.
FunderDepartment of Agriculture, Food and the Marine; Erasmus+ programme; Mexican National Council of Science and Technology (CONACYT)
The following license files are associated with this item:
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 United States