(1/2) Next stop of the #ISCLB2022 field tour in the Kodia-Bousalem (Tunisia) septoria plateform...

(1/2) First stop in the #Joumine area (Tunisia) during the #ISCLB2022 field tour. Would you recognize some of the fungal pathogens that we found on durum #wheat (cv Monastir, INRAT100)? ⬇️

Fin de congrès #ISCLB2022 en apothéose sur les toits de la Médina de #Tunis 🇹🇳 pour la team Zymo @INRAE_Bioger 🥰 !

Amazing presentation 👏 #ISCLB2022 by Camilla Langlands-Perry @INRAE_Bioger @arvalispatho "The interaction between Stb20q in #wheat and AvrStb20q in #Zymoseptoria tritici blurs the frontier between qualitative and quantitative resistances".
@NicolasLapalu @anais_pitarch @Reddamez

Happy to see you @APKaristo in your garden 😆 #ISCLB2022. We miss you!

x.com/KamounLab/stat…

Great presentation 👏 #ISCLB2022 by @Reddamez @INRAE_Bioger @BASF_Agro_FR "Antagonist pleiotropic effects reduce adaptation of the #wheat pathogen #Zymoseptoria tritici".

How large and diverse are field populations of fungal plant pathogens? The case of Zymoseptoria tritici 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. ### Competing Interest Statement The authors have declared no competing interest.

Thought-provoking keynote #ISCLB2022 by @MikabAley "Remarkable size and genetic diversity of #Zymoseptoria tritici populations in #wheat: implications for #epidemiology and management".

x.com/KamounLab/stat… doi.org/10.1101/2022.0…

How large and diverse are field populations of fungal plant pathogens? The case of Zymoseptoria tritici 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. ### Competing Interest Statement The authors have declared no competing interest.

Thought-provoking keynote #ISCLB2022 by @MikabAley "Remarkable size and genetic diversity of #Zymoseptoria tritici populations in #wheat: implications for #epidemiology and management".

x.com/KamounLab/stat… doi.org/10.1101/2022.0…

Presentation #ISCLB2022 by Emmie Dzialo @INRAE_Bioger "Congruent structuration of genetic and pathotypic diversities in Euro-mediterranean populations of #Zymoseptoria tritici collected on durum #wheat"
@arvalispatho @CarpentierFlor

Presentation of the Safa Ben Krima's PhD work "Diversity and adaptation of #Zymoseptoria tritici in genetically homogeneous vs heterogeneous #wheat populations" by Thierry Marcel @INRAE_Bioger #ISCLB2022

x.com/wheatpath/stat…