Molecular characterization of arbuscular mycorrhizal fungi in an agroforestry system reveals the predominance of Funneliformis spp. associated with Colocasia esculenta and Pterocarpus officinalis adult trees and seedlings

Geoffroy Alexandre, Sanguin Hervé, Galiana Antoine, Bâ Amadou Moustapha. 2017. Molecular characterization of arbuscular mycorrhizal fungi in an agroforestry system reveals the predominance of Funneliformis spp. associated with Colocasia esculenta and Pterocarpus officinalis adult trees and seedlings. Frontiers in Microbiology, 8:1426, 10 p.

Url - jeu de données - Entrepôt autre : https://www.ncbi.nlm.nih.gov/bioproject

Quartile : Q1, Sujet : MICROBIOLOGY

Résumé : Pterocarpus officinalis (Jacq.) is a leguminous forestry tree species endemic to Caribbean swamp forests. In Guadeloupe, smallholder farmers traditionally cultivate flooded taro (Colocasia esculenta) cultures under the canopy of P. officinalis stands. The role of arbuscular mycorrhizal (AM) fungi in the sustainability of this traditional agroforestry system has been suggested but the composition and distribution of AM fungi colonizing the leguminous tree and/or taro are poorly characterized. An in-depth characterization of root-associated AM fungal communities from P. officinalis adult trees and seedlings and taro cultures, sampled in two localities of Guadeloupe, was performed by pyrosequencing (GS FLX+) of partial 18S rRNA gene. The AM fungal community was composed of 215 operational taxonomic units (OTUs), belonging to eight fungal families dominated by Glomeraceae, Acaulosporaceae, and Gigasporaceae. Results revealed a low AM fungal community membership between P. officinalis and C. esculenta. However, certain AM fungal community taxa (10% of total community) overlapped between P. officinalis and C. esculenta, notably predominant Funneliformis OTUs. These findings provide new perspectives in deciphering the significance of Funneliformis in nutrient exchange between P. officinalis and C. esculenta by forming a potential mycorrhizal network.

Mots-clés Agrovoc : Colocasia esculenta, Pterocarpus, mycorhization, symbiose, système racinaire, mycorhizé à vésicule et arbuscule, biologie moléculaire, taxonomie

Mots-clés géographiques Agrovoc : Guadeloupe, France

Mots-clés complémentaires : Pterocarpus officinalis, Funneliformis

Mots-clés libres : Arbuscular mycorrhizal community, Colocasia esculenta, Funneliformis, Guadeloupe, Pterocarpus officinalis, Pyrosequencing, Tropical agroforestry

Classification Agris : P34 - Biologie du sol
F08 - Systèmes et modes de culture
K10 - Production forestière

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Geoffroy Alexandre, CIRAD-BIOS-UMR LSTM (FRA)
• Sanguin Hervé, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0001-7160-2840
• Galiana Antoine, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-5293-5049
• Bâ Amadou Moustapha, LSTM (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/585236/)

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