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Variability of initial growth, water-use efficiency and carbon isotope discrimination in seedlings of Faidherbia albida (Del.) A. Chev., a multipurpose tree of semi-arid Africa. Provenance and drought effects

Roupsard Olivier, Joly Hélène, Dreyer Erwin. 1998. Variability of initial growth, water-use efficiency and carbon isotope discrimination in seedlings of Faidherbia albida (Del.) A. Chev., a multipurpose tree of semi-arid Africa. Provenance and drought effects. Annales des Sciences Forestières, 55 : pp. 329-348.

Journal article ; Article de revue à facteur d'impact
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Titre français : Variabilité de la croissance initiale, de l'efficience d'utilisation de l'eau, et de la discrimination isotopique du carbone de plantules de Faidherbia albida (Del.) A. Chev., un arbre à usages multiples d'Afrique semi-aride. Effets provenance et sécheresse

Abstract : The panafrican provenances of #Faidherbia albida# display contrasting growth and survival rates in semi-arid zones of western Africa, when they are compared in multi-local field trials. In order to identify some potential causes for such differences, we recorded the genetic variability of ecophysiological traits (including water-use efficiency, W, and carbon isotope discrimination, A) in seven provenances from contrasting habitats of western and south-eastern Africa. Provenance and drought effects were tested on potted seedlings in a greenhouse. After 6 months, the total dry mass of the well-irrigated seedlings ranged from 31 to 86 g, and the total water-use from 8 to 18 kg. Both initial growth and water consumption were strongly correlated with leaf area. We displayed a significant inter-provenance variability, and exhibited the highest values in the south-east African provenances, which were the most vigourous, but also presented the poorest survival rates in field trials. It was negatively con-elated with the leaf-to-total dry mass ratio, LMR, and to A. The mild drought significantly reduced gas-exchange rates, leaf area, growth, water-use, specific leaf area, and A in all provenances. It also increased the intrinsic water-use efficiency, A/g, and the root-to-total dry mass ratio, but did not affect W or LMR. No provenance x drought interaction was found in any variable. The initial rate of leaf area establishment probably plays a major role in explaining the contrasting water-use strategies of the provenances. (Résumé d'auteur)

Mots-clés Agrovoc : Stade juvénile des plantes, Exigence des plantes, Relation plante eau, Potentiel hydrique, Facteur du milieu, Stress dû à la sécheresse, Variation génétique, Variation saisonnière, Phénologie, Résistance à la sécheresse, Provenance, Croissance

Classification Agris : F60 - Plant physiology and biochemistry

Auteurs et affiliations

  • Roupsard Olivier, CIRAD-CP-COCOTIER (FRA)
  • Joly Hélène, CIRAD-FORET-DIR (FRA)
  • Dreyer Erwin

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/390557/)

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