Braconnier Serge, Bonneau Xavier.
1998. Effects of chlorine deficiency in the field on leaf gas exchanges in the PB 121 coconut hybrid.
In : Contract TS3*CT92-0132. "Coconut-based farming systems. Operational and economic analysis models". Annexes = [Contrat TS3 CT92 0132. "Systèmes de culture en association avec le cocotier. Modèles de fonctionnement et d'analyse économique". Annexes]. CIRAD-C
Autre titre : Effets d'une carence en chlorure au champ sur les échanges gazeux foliaires du cocotier hybride PB 121
Résumé : A study of leaf gas exchanges during the dry season and rainy season confirmed the importance of the Cl- ion in coconut. In the dry season, compared to a control, chloride deficiency led to lower stomatal conductance in coconut, hence a reduction in leaf gas exchanges. This resulted in less intense net photosynthesis and transpiration, which accounted for the poorer drought tolerance of Cl- deficient palms. During the dry season, even if not very intense, coconut palms that were not Cl- deficient maintained and even increased their stomatal conductance. This enabled them to increase leaf transpiration, hence responding to the increase in evaporative demand and maintaining a high level of net assimilation. Conversely, deficient palms reduced their stomatal conductance, leading to a drop in transpiration and in net photosynthesis. Observations during the rainy season failed to reveal any effect of chloride deficiency on intrinsic photosynthesis. The Cl- ion therefore seems to act primarily during the dry season, and in stomatal regulation.
Mots-clés Agrovoc : Cocos nucifera, hybride, résistance à la sécheresse, carence minérale, chlorure, photosynthèse, transpiration, échange gazeux, stomate, conductance stomatique
Mots-clés géographiques Agrovoc : Indonésie
Mots-clés complémentaires : Cocotier PB 121
Classification Agris : F60 - Physiologie et biochimie végétale
F61 - Physiologie végétale - Nutrition
P35 - Fertilité du sol
Auteurs et affiliations
- Braconnier Serge, CIRAD-AMIS-AGRONOMIE (SEN)
- Bonneau Xavier, CIRAD-CP-COCOTIER (FRA)
Source : Cirad - Agritrop (https://agritrop.cirad.fr/390467/)
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