Concurrent starch accumulation in stump and high fruit production in coffee ( Coffea arabica )
- Type de publi. : Article dans une revue
- Date de publi. : 04/12/2021
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Auteurs :
Aurélie CambouPhilippe ThalerAnne Clément-VidalBernard G. BarthèsFabien CharbonnierKarel van den MeerscheMaria Aguilar VegaJacques AvelinoFabrice DavrieuxJean-Pierre LabouisseElias de Melo Virginio FilhoPhilippe DeleporteDidier BrunetPeter LehnerOlivier Roupsard
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Organismes :
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Département Performances des systèmes de production et de transformation tropicaux
Amélioration génétique et adaptation des plantes méditerranéennes et tropicales
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Consejo Nacional de Ciencia y Tecnología [Mexico]
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Centro Agronómico Tropical de Investigación y Enseñanza - Tropical Agricultural Research and Higher Education Center
Centro Agronómico Tropical de Investigación y Enseñanza - Tropical Agricultural Research and Higher Education Center
Plant Health Institute of Montpellier
Département Systèmes Biologiques
Centro Agronómico Tropical de Investigación y Enseñanza - Tropical Agricultural Research and Higher Education Center
Démarche intégrée pour l'obtention d'aliments de qualité
Département Performances des systèmes de production et de transformation tropicaux
Département Systèmes Biologiques
Amélioration génétique et adaptation des plantes méditerranéennes et tropicales
Centro Agronómico Tropical de Investigación y Enseñanza - Tropical Agricultural Research and Higher Education Center
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Cafetalera Aquiares
Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
Département Performances des systèmes de production et de transformation tropicaux
Centro Agronómico Tropical de Investigación y Enseñanza - Tropical Agricultural Research and Higher Education Center
LMI IESOL Intensification Ecologique des Sols Cultivés en Afrique de l’Ouest [Dakar]
- Publié dans Tree Physiology le 29/10/2020
Résumé : In coffee, fruit production on a given shoot drops after some years of high yield, triggering pruning to induce resprouting. The timing of pruning is a crucial farmer’s decision affecting yield and labour. One reason for fruit production drop could be the exhaustion of resources, particularly the non-structural carbohydrates (NSC). To test this hypothesis in a Coffea L. arabica agroforestry system, we measured the concentrations of NSC, carbon (C) and nitrogen (N) in leaves, stems and stumps of the coffee plants, 2 and 5 years after pruning. We also compared shaded vs full sun plants. For that purpose, both analytical reference and visible and near infrared reflectance spectroscopy (VNIRS) methods were used. As expected, concentrations of biochemical variables linked to photosynthesis activity (N, glucose, fructose, sucrose) decreased from leaves to stems, and then to stumps. In contrast, variables linked more closely to plant structure and reserves (total C, C:N ratio, starch concentration) were higher in long lifespan organs like stumps. Shading had little effect on most measured parameters, contrary to expectations. Concentrations of N, glucose and fructose were higher in 2-year-old organs. Conversely, starch concentration in perennial stumps was three times higher 5 years after pruning than 2 years after pruning, despite high fruit production. Therefore, the drop in fruit production occurring after 5–6 years was not due to a lack of NSC on plant scale. Starch accumulation in perennial organs concurrently to other sinks, such as fruit growth, could be considered as a ‘survival’ strategy, which may be a relic of the behaviour of wild coffee (a tropical shade-tolerant plant). This study confirmed that VNIRS is a promisingly rapid and cost-effective option for starch monitoring (coefficient of determination for validation, R2val = 0.91), whereas predictions were less accurate for soluble sugars, probably due to their too similar spectral signature.
Fichiers liés :
2021CambouVandenMeerscheRoupsardetalstarchincoffee.pdf
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