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Patterns of thermal adaptation in a worldwide plant pathogen: local diversity and plasticity reveal two-tier dynamics

Anne-Lise Boixel, Michaël Chelle, View ORCID ProfileFrédéric Suffert
doi: https://doi.org/10.1101/2019.12.16.877696
Anne-Lise Boixel
1Université Paris-Saclay, INRAE, AgroParisTech, UMR BIOGER, 78850, Thiverval-Grignon, France
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  • For correspondence: anne-lise.boixel@inra.fr frederic.suffert@inra.fr
Michaël Chelle
2Université Paris-Saclay, INRAE, AgroParisTech, UMR ECOSYS, 78850, Thiverval-Grignon, France
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Frédéric Suffert
1Université Paris-Saclay, INRAE, AgroParisTech, UMR BIOGER, 78850, Thiverval-Grignon, France
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  • ORCID record for Frédéric Suffert
  • For correspondence: anne-lise.boixel@inra.fr frederic.suffert@inra.fr
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Summary

  • Plant pathogen populations inhabit patchy environments with contrasting, variable thermal conditions. We investigated the diversity of thermal responses in populations sampled over contrasting spatiotemporal scales, to improve our understanding of their dynamics of adaptation to local conditions.

  • Samples of natural populations of the wheat pathogen Zymoseptoria tritici were collected from sites within the Euro-Mediterranean region subject to a broad range of environmental conditions. We tested for local adaptation, by accounting for the diversity of responses at the individual and population levels on the basis of key thermal performance curve parameters and ‘thermotype’ (groups of individuals with similar thermal responses) composition.

  • The characterisation of phenotypic responses and genotypic structure revealed: (i) a high degree of individual plasticity and variation in sensitivity to temperature conditions across spatiotemporal scales and populations; (ii) geographic adaptation to local mean temperature conditions, with major alterations due to seasonal patterns over the wheat-growing season.

  • The seasonal shifts in functional composition suggest that populations are locally structured by selection, contributing to shape adaptation patterns. Further studies combining selection experiments and modelling are required to determine how functional group selection drives population dynamics and adaptive potential in response to thermal heterogeneity.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 17, 2019.
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Patterns of thermal adaptation in a worldwide plant pathogen: local diversity and plasticity reveal two-tier dynamics
Anne-Lise Boixel, Michaël Chelle, Frédéric Suffert
bioRxiv 2019.12.16.877696; doi: https://doi.org/10.1101/2019.12.16.877696
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Patterns of thermal adaptation in a worldwide plant pathogen: local diversity and plasticity reveal two-tier dynamics
Anne-Lise Boixel, Michaël Chelle, Frédéric Suffert
bioRxiv 2019.12.16.877696; doi: https://doi.org/10.1101/2019.12.16.877696

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