Effet des déficits hydriques et des forts éclairements sur la photosynthèse de jeunes semis de chânes en conditions contrôlées et de chênes adultes en conditions naturelles

Abstract : The aims of this work were to study the effects of leaf water status on photosynthesis, the effects of high light on the photosynthetic apparatus in relation to leaf water status and the real effects of summer drought on tree photosynthesis. Results obtained on oaks confirm that the photosynthetic appartus is highly resistant to leaf dehydratino and to water deprivation. During drought, net CO2 assimilation was mainly limited by stomatal closure. Persistent photoinhibition do not occur as long as leaves were not submit to higher light levels than those received during growth. Different mechanisms contribute to this tolerance to high light stres. Capacity of leaves to modulate photosystem II activity in response to irradiance and/or electron requirement variations is the main important one. But, during drought, photorespiration limits the decrease ine photosystem II activity.
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Daniel Epron. Effet des déficits hydriques et des forts éclairements sur la photosynthèse de jeunes semis de chânes en conditions contrôlées et de chênes adultes en conditions naturelles. Biologie végétale. Université Henri Poincaré - Nancy 1, 1993. Français. ⟨NNT : 1993NAN10010⟩. ⟨tel-01775845⟩

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