2022/03/13 by Bruce A. McDonald, Frédéric Suffert, Alessio Bernasconi +1 · 1 voice
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Evolution and Genetic Dynamics #Plant Disease Resistance and Genetics #Wheat and Barley Genetics and Pathology
paper · pdf · doi:10.1101/2022.03.13.484150
openalex publication_date 2022/03/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/22
Abstract Pathogen populations differ in the amount of genetic diversity they contain. Populations carrying higher genetic diversity are thought to have a greater evolutionary potential than populations carrying less diversity. We used published studies to estimate the range of values associated with two critical components of genetic diversity, the number of unique pathogen genotypes and the number of spores produced during an epidemic, for the septoria tritici blotch pathogen Zymoseptoria tritici . We found that wheat fields experiencing typical levels of infection are likely to carry between 3.2 and 14.9 million pathogen genotypes per hectare and produce at least 2.3 to 10.5 trillion pycnidiospores per hectare. Given the experimentally derived mutation rate of 3 × 10 −10 substitutions per site per cell division, we estimate that between 28 and 130 million pathogen spores carrying adaptive mutations to counteract fungicides and resistant cultivars will be produced per hectare during a growing season. This suggests that most of the adaptive mutations that have been observed in Z. tritici populations can emerge through local selection from standing genetic variation that already exists within each field. The consequences of these findings for disease management strategies are discussed.