Assimilate storage in vegetative organs of coconut (Cocos nucifera) : [Abstract]

Mialet-Serra Isabelle, Clément Anne, Sonderegger Nicole, Roupsard Olivier, Flori Albert, Jourdan Christophe, Labouisse Jean-Pierre, Dingkuhn Michaël. 2006. Assimilate storage in vegetative organs of coconut (Cocos nucifera) : [Abstract]. In : Coconut revival: new possibilities for the tree of life. Proceedings of the International Coconut Forum held in Cairns, Australia, 22-24 November 2005. Adkins Steve W. (ed.), Foale M.A. (ed.), Samosir Yohannes M.S. (ed.). Department of Employment, Economic Development and Innovation. Canberra : ACIAR, p. 99. (ACIAR Proceedings Series, 125) ISBN 1-86320-514-4 International Coconut Forum, Cairns, Australie, 22 November 2005/24 November 2005.

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Matériel d'accompagnement : 1 poster

Abstract : Assimilate storage in vegetative organs is an essential buffer for the source-sink imbalances that inevitably occur in perennial plants. In contrast to temperate trees, little information is available on such storage in tropical perennials, and almost none for coconut (Cocos nucifera). This poster describes the chemical nature, quantity, distribution and seasonal dynamics of carbohydrate reserves in 17-year-old adult coconut plants grown in optimum conditions (Republic of Vanuatu, southern Pacific). Plants contained little starch but large quantities of sucrose were found, mainly located in the trunk. Less sucrose was present in roots and little in leaflets. Large glucose and fructose pools were found in leaves near the apex of the trunk, in fruits and in the terminal portions of large roots. Aggregate soluble and non-soluble sugar pools were about equivalent to 6 months of copra production or 51 days of crop growth. Under our optimum conditions, these pools varied little, particularly in the trunk, but they may be mobilisable under stress conditions. The reserves did not seem to play a role in the regulation of production of fruit (in quantity). The number of fruits produced seemed to be controlled precociously during two stages - at the moment of differentiation of the flowers and at the beginning of growth of the fruit. Thereafter, the growth (in terms of dry biomass production) of fruit did not seem to be limited by the availability of sugars. (Texte intégral)

Mots-clés Agrovoc : Cocos nucifera, Organe de réserve, Glucide, saccharose, Amidon, Physiologie de la nutrition, Fructose, Développement biologique, Fruit, Croissance

Mots-clés géographiques Agrovoc : Vanuatu

Mots-clés complémentaires : Sink effect

Classification Agris : F61 - Plant physiology - Nutrition
F62 - Plant physiology - Growth and development

Auteurs et affiliations

  • Mialet-Serra Isabelle, CIRAD-AMIS-UPR Modélisation intégrative (FRA)
  • Clément Anne, CIRAD-AMIS-UPR Modélisation intégrative (FRA)
  • Sonderegger Nicole, CIRAD-AMIS-UPR Modélisation intégrative (FRA)
  • Roupsard Olivier, CIRAD-FORET-UPR Ecosystèmes de plantations (VUT)
  • Flori Albert, CIRAD-CP-UPR Génétique palmier (FRA)
  • Jourdan Christophe, CIRAD-FORET-UPR Ecosystèmes de plantations (FRA)
  • Labouisse Jean-Pierre, CIRAD-CP-UMR DGPC (ETH) ORCID: 0000-0002-5592-6789
  • Dingkuhn Michaël, CIRAD-AMIS-UPR Modélisation intégrative (FRA)

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