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Variabilité intraspécifique de l'efficience d'utilisation de l'eau dans une famille de chêne pédonculé (Quercus robur L.) : causes physiologiques et/ou anatomiques

Abstract : Pedunculate oak is a species that shows a large intraspecific variability of water-use efficiency (WUE). The genetic determinism of WUE in this species has been demonstrated. WUE is a complex trait which is defined at a leaf level as the ratio of net CO2 assimilation rate (A) on stomatal conductance for water vapor (gs). This ratio -estimated with carbon isotope composition of organic matter ([delta exponent 13]C)- is therefore influenced by numerous physiological or anatomical traits that influence A (chlorophyll content, thickness of leaf tissue) or gs (stomatal density...). The comparison of genotypes belonging to a same full-sib family of pedunculate oak, in non-limiting conditions, for these foliar traits has shown that the variability of WUE in this family was linked to the variability of gs instead of photosynthetic capacity. To go further, a study has been done on the possibility to use the variations of the isotope composition of oxygen ([exponent 16]O/[exponent 18]O) of leaf water and leaf organic matter to decompose the differences in water-use efficiency in its photosynthetic and transpiratory components. The results of this study has shown that the [exponent 18]O signature coulb be used as a proxy for gs for pedunculate oak, but only in controlled conditions, and after amelioration of organic matter extraction procedures.
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https://hal.univ-lorraine.fr/tel-02821453
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  • HAL Id : tel-02821453, version 2
  • PRODINRA : 46337

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Magali Roussel. Variabilité intraspécifique de l'efficience d'utilisation de l'eau dans une famille de chêne pédonculé (Quercus robur L.) : causes physiologiques et/ou anatomiques. Biologie végétale. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10090⟩. ⟨tel-02821453v2⟩

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