Variabilité génétique de la réponse du métabolisme carboné du chêne pédonculé (Quercus robur L.) à des teneurs croissantes en CO2

Abstract : 183 pedunculate oaks from a full-sib family were exposed for one year to 380 or 680 vpm [CO2] in glasshouses. Gas exchanges and growth were measured at several dates. Biochemical measurements on the photosynthetic apparatus and discrimination against 13C were also determined. The general stimulation of the trees growth under elevated [CO2] is associated with higher water use efficiency linked to a lowered stomatal conductance. Photosynthesis is stimulated for a moment although the nitrogen is clearly redirected to other physiological processes. Several genome regions are of special interest with a large number of detected QTLs (Quantitative Trait Loci) associated with different characters. Several QTLs showed a significant response to the [CO2] variation on atmosphere. This approach is new in integrative biology, and first results suggest great opportunities by continuing such experiments.
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Xavière Torti-Marcy. Variabilité génétique de la réponse du métabolisme carboné du chêne pédonculé (Quercus robur L.) à des teneurs croissantes en CO2. Sciences agricoles. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10130⟩. ⟨tel-01754326⟩

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