Séminaire d'Andreas PRINZING


 Olivier Troccaz    21/02/2018 : 10:14

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Le vendredi 23 février 2018 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Le vendredi 23 février 2018 à 13h00, salle de conférences de l'OSUR, bâtiment 14b, Campus de Beaulieu, UR1

Closely related neighbors select for chemical defenses in oaks

Abstract:

Under global change, trees face a double pressure from enemies and harsh climate. Both pressures may be modified by the tree neighbourhood such as increased enemy pressure in a closely related neighborhood. Both, local neighbourhood and regional climates, may select for adapted genotypes. Adaptations to such pressures include flavonoids and anthocyanins, suggesting that the adaptation to one pressure may interact with the adaptation to the other, either by a trade-off or by mutual facilitation. We studied oak seedlings in evolutionary proximate and distant neighbourhoods as well as adults of genotypes that have been selected by such neighbourhoods. We studied anthocyanin and flavonoid contents as well as morphological defenses and the performance of seedlings and trees in terms of growth and survival. We found evidence for a response to both climate and neighbourhood, and heritability of this response. Tentative results suggest that evolutionary proximate neighbours (i) are a direct shelter for seedlings and indirectly facilitate the response to climate stress; (ii) have no direct effect on adults but indirectly facilitate response to herbivores while impeding response to climate stress. Overall, evolutionary proximate neighbours seem to facilitate chemical adaptation to climate stress at seedling stage and chemical adaptation to natural enemies at adult stage.

Contact : Andreas PRINZING

Affiche Seminaire ESDD 230218





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