+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Genetic correlations in resistance to sterol biosynthesis-inhibiting fungicides in Pyrenophora teres

Genetic correlations in resistance to sterol biosynthesis-inhibiting fungicides in Pyrenophora teres

Phytopathology 83(10): 1076-1082

We investigated cross-resistance in Pyrenophora teres to five sterol biosynthesis-inhibiting fungicides (SBIs) by calculating genetic correlations in resistance. Two approaches were used in separate experiments to estimate the correlations: In one method, progeny sampled from crosses of P. teres were used to determine "among-family" genetic correlations; in the other method, replicated isolates sampled from different P. teres populations were used to calculate "among-isolate" genetic correlations. Resistances to some members of the demethylation inhibitor (DMI) group of SBIs (triadimenol, propiconazole, imazalil, and fenarimol) were highly genetically correlated in both experiments, consistent with the hypothesis that many of the same genes, or genes in gametic disequilibrium, control resistance to these DMIs. However, resistances to several other pairs of DMIs had correlation coefficients that were not significantly different from zero, indicating that independent genes may control resistance to these pairs. Genetic correlations in resistance to DMIs and the morpholine SBI fenpropimorph appeared to differ from the DMI-DMI correlations, and many of the coefficients were not significantly different from zero, consistent with the hypothesis that independent genes control resistance to DMIs and fenpropimorph. Some of the genetic correlation coefficients in resistance to DMIs and fenpropimorph, however, were not significantly different from one, indicating that in certain P. teres populations, the same genes or genes in gametic disequilibrium controlled resistance to these pairs of SBIs. Many of the correlation coefficients in resistance to any given pair of SBIs differed among populations of P. teres, indicating significant genetic differentiation among these populations. The variability in correlation coefficients observed between DMI-DMI and DMI-fenpropimorph combinations and among populations indicates that no single model of cross-resistance among SBIs and among all P. teres populations is appropriate. Among-isolate genetic correlations provided more accurate estimates of cross-resistance among SBIs than the among-family estimates and represent the most evolutionarily relevant approach to studying genetic correlations in resistance in P. teres and other predominantly asexually reproducing fungi.

(PDF emailed within 1 workday: $29.90)

Accession: 002390600

Download citation: RISBibTeXText

Related references

Lack of correlation between fitness and resistance to sterol biosynthesis-inhibiting fungicides in Pyrenophora teres. Phytopathology 84(10): 1078, 1994

Genetic and phenotypic correlations as methods for studying cross resistance among sterol biosynthesis inhibiting fungicides. Phytopathology 82(2): 246-247, 1992

Genetic correlations in resistance to morpholine and piperidine fungicides in Pyrenophora teres populations. European Journal of Plant Pathology 101(1): 93-99, 1995

Effects of sterol biosynthesis inhibitor fungicides on growth and sterol composition of Ustilago maydis, Botrytis cinerea and Pyrenophora teres. Pesticide Science 36(1): 7-17, 1992

Pathogenicity of Pyrenophora teres f. teres and P. teres f. maculata, resistance of barley, and biological and environmental effects on selection for resistance to P. teres f. teres. International Journal of Tropical Plant Diseases 11(2): 147-160, 1993

Identifying genetic complexity of 6H locus in barley conferring resistance to Pyrenophora teres f. teres. Plant Breeding 130(4): 423-429, 2011

Resistance to sterol biosynthesis-inhibiting fungicides: current status and biochemical basis. ACS Symposium series American Chemical Society: 21) 199-214, 1990

Genetic Characterization of Resistance to Pyrenophora teres f. teres in the International Barley Differential Canadian Lake Shore. Frontiers in Plant Science 10: 326, 2019

Cross-resistance patterns among sterol biosynthesis inhibiting fungicides (SBIs) in Cercospora beticola. European Journal of Plant Pathology 109(9): 929-934, 2003

Strains of Pyrenophora teres in New Zealand barley crops with reduced sensitivity to ergosterol biosynthesis inhibitor fungicides. Proceedings of the New Zealand Weed and Pest Control Conference (40): 172-175, 1987

Sterol inhibiting fungicides effects on sterol biosynthesis and sites of action. Plant Disease 65(12): 986-989, 1981

Effects of sterol biosynthesis inhibiting fungicides and plant growth regulators on the sterol composition of barley plants. Pesticide Biochemistry & Physiology 27(3): 289-300, 1987

Genetic Relationship of Pyrenophora graminea, P-teres f. maculata and P-teres f. teres assessed by RAPD analysis. Journal of Phytopathology (Berlin) 155(2): 76-83, 2007

Characterization and distribution of pathogenic variation in pyrenophora teres f teres and pyrenophora teres f maculata from western canada. Canadian Journal of Plant Pathology 12(2): 141-148, 1990

Diagnostic microsatellite markers for the barley net blotch pathogens, Pyrenophora teres f. maculata and Pyrenophora teres f. teres. Australasian Plant Pathology 37(4): 428-430, 2008