Ectomycorrhizal diversity enhances growth and nitrogen fixation of Acacia mangium seedlings

Diagne Nathalie, Thioulouse Jean, Sanguin Hervé, Prin Yves, Krasova-Wade Tatiana, Sylla Samba, Galiana Antoine, Baudoin Ezékiel, Neyra Marc, Svistoonoff Sergio, Lebrun Michel, Duponnois Robin. 2013. Ectomycorrhizal diversity enhances growth and nitrogen fixation of Acacia mangium seedlings. Soil Biology and Biochemistry, 57 : 468-476.

Quartile : Q1, Sujet : SOIL SCIENCE

Résumé : Increasing interest has been given so far to the role of mycorrhizal symbiosis on plant diversity and ecosystem productivity. However much remains unknown about the effect of ectomycorrhizal fungal diversity on plant growth and rhizobial symbiosis. The purpose of this study is to investigate the influence of ectomycorrhizal diversity on root nodulation and plant nutrient uptake during plant growth. A gradient of ectomycorrhizal diversity was created (ranged from one to six fungal isolates) on Australian Acacia (Acacia mangium) seedlings grown on a phosphate-deficient soil in controlled conditions. The results clearly show (i) an enhancement of A. mangium growth due to ectomycorrhizal fungal inoculation, (ii) as well as significant effects of increasing ectomycorhizal diversity and soil ectomycorrhizal mycelium density on whole plant biomass and plant nutrient uptake. They also reveal an effect of ectomycorrhizal diversity effect on the functioning of the nitrogen-fixing symbiosis. These results emphasize the need to manage soil ectomycorrhizal potential (abundance and diversity of ectomycorrhizal mycelium) in forest management practices in order to optimize N2 fixation and seedling growth, leading thus to dramatic improvements in outplanting performances with fast-growing tree legumes on various reafforestation sites, more particularly in tropical and Mediterranean areas.

Mots-clés Agrovoc : Acacia mangium, Fixation de l'azote, Mycorhizé, nodosité racinaire, croissance, biodiversité, ectomycorhize

Classification Agris : F62 - Physiologie végétale - Croissance et développement
F61 - Physiologie végétale - Nutrition
P34 - Biologie du sol
K01 - Foresterie - Considérations générales

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Diagne Nathalie, IRD (SEN)
• Thioulouse Jean, CNRS (FRA)
• Sanguin Hervé, CIRAD-BIOS-UMR LSTM (FRA)
• Prin Yves, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-3706-0045
• Krasova-Wade Tatiana, IRD (SEN)
• Sylla Samba, IRD (SEN)
• Galiana Antoine, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-5293-5049
• Baudoin Ezékiel, IRD (SEN)
• Neyra Marc, IRD (FRA)
• Svistoonoff Sergio, IRD (FRA)
• Lebrun Michel, IRD (FRA)
• Duponnois Robin, IRD (SEN)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/566557/)

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