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Variabilité structurale et fonctionnelle du xylème et plasticité en réponse à la sécheresse chez le peuplier

Abstract : This work aimed at characterizing xylem hydraulic architecture and at describing its relationships with whole plant water and carbon relations among Populus deltoides × P. nigra hybrids under contrasting water regimes. Eight genotypes differing in carbon isotope discrimination were grown in the field in a common garden test. Significant variations were observed between genotypes for all xylem anatomical characteristics, stem or whole-plant hydraulic efficiency and xylem resistance to cavitation. Drought-induced acclimation was observed for xylem structural features and xylem resistance to cavitation, but in a genotype-dependant manner. Under optimal irrigation, a trade-off was observed between hydraulic efficiency and xylem resistance to cavitation or growth performance. These two trade-offs translated into an uncommon positive relationship between xylem resistance to cavitation and growth performance. Under water deficit,this relationship broke down. No relationship could be detected between xylem hydraulics and water-use efficiency estimates. Our results suggest in part that several common relationships that are observed at the between-species level may not necessarily hold true at narrower scales. Further, this work opens up prospects both for identifying the molecular basis of xylem structural acclimation and for breeding strategies.
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https://tel.archives-ouvertes.fr/tel-00579446
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Régis Fichot. Variabilité structurale et fonctionnelle du xylème et plasticité en réponse à la sécheresse chez le peuplier. Sciences agricoles. Université d'Orléans, 2010. Français. ⟨NNT : 2010ORLE2021⟩. ⟨tel-00579446⟩

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