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Dernière mise à jour : Mai 2018

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UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

La photosynthèse est-elle réservée aux feuilles ? Création d’une chambre de mesure de la photosynthèse adaptée aux organes tridimensionnels

La photosynthèse
Fait marquant EcoSys P. Bancal 2018

Résumé :

La fonction photosynthétique des plantes n’est pas exclusivement concentrée dans les feuilles. La contribution d’autres organes à la photosynthèse est souvent oubliée et négligée dans les modèles, bien qu’elle peut jouer un rôle majeur dans des conditions de stress (pathogènes, polluants, sécheresse). Nous avons mise au point un outil permettant de réaliser en conditions contrôlées (lumière, température, humidité, CO2) des mesures d’échange gazeux des organes non-limbes, par exemple des tiges, des fruits, des épis ou des grappes de raisins. Il s’agit d’une chambre cylindrique portative avec un éclairage LED isotrope avec une faible dissipation thermique, couplée à un analyseur de photosynthèse (Li 6400XT). Cette chambre a donné lieu à une déclaration d’invention et à une publication dans Plant Methods.