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Arbuscular mycorrhizal colonization and nodulation improve flooding tolerance in Pterocarpus officinalis Jacq. seedlings

Fougnies Laétitia, Renciot Sabrina, Muller Félix, Plenchette Christian, Prin Yves, De Faria Sergio Miana, Bouvet Jean-Marc, Sylla Samba, Dreyfus Bernard, Bâ Amadou Moustapha. 2007. Arbuscular mycorrhizal colonization and nodulation improve flooding tolerance in Pterocarpus officinalis Jacq. seedlings. Mycorrhiza, 17 (3) : pp. 159-166.

Journal article ; Article de revue à facteur d'impact
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Abstract : Pterocarpus officinalis (Jacq.) seedlings inoculated with the arbuscular mycorrhizal fungus, Glomus intraradices, and the strain of Bradyrhizobium sp. (UAG 11A) were grown under stem-flooded or nonflooded conditions for 13 weeks after 4 weeks of nonflooded pretreatment under greenhouse conditions. Flooding of P. officinalis seedlings induced several morphological and physiological adaptive mechanisms, including formation of hypertrophied lenticels and aerenchyma tissue and production of adventitious roots on submerged portions of the stem. Flooding also resulted in an increase in collar diameter and leaf, stem, root, and total dry weights, regardless of inoculation. Under flooding, arbuscular mycorrhizas were well developed on root systems and adventitious roots compared with inoculated root systems under nonflooding condition. Arbuscular mycorrhizas made noteworthy contributions to the flood tolerance of P. officinalis seedlings by improving plant growth and P acquisition in leaves. We report in this study the novel occurrence of nodules connected vascularly to the stem and nodule and arbuscular mycorrhizas on adventitious roots of P. officinalis seedlings. Root nodules appeared more efficient fixing N2 than stem nodules were. Beneficial effect of nodulation in terms of total dry weight and N acquisition in leaves was particularly noted in seedlings growing under flooding conditions. There was no additive effect of arbuscular mycorrhizas and nodulation on plant growth and nutrition in either flooding treatment. The results suggest that the development of adventitious roots, aerenchyma tissue, and hypertrophied lenticels may play a major role in flooded tolerance of P. officinalis symbiosis by increasing oxygen diffusion to the submerged part of the stem and root zone, and therefore contribute to plant growth and nutrition. (Résumé d'auteur)

Mots-clés Agrovoc : Pterocarpus, Mycorhizé, Symbiose, Glomus intraradices, Bradyrhizobium, Tige, Fixation de l'azote, Racine adventive, Mycorhizé à vésicule et arbuscule, nodosité racinaire, Tolérance, Inondation

Mots-clés complémentaires : Pterocarpus officinalis, Nodule caulinaire

Classification Agris : F62 - Plant physiology - Growth and development
H50 - Miscellaneous plant disorders
P34 - Soil biology
F61 - Plant physiology - Nutrition

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

Auteurs et affiliations

  • Fougnies Laétitia, UAG (GLP)
  • Renciot Sabrina, UAG (GLP)
  • Muller Félix, UAG (GLP)
  • Plenchette Christian, INRA (FRA)
  • Prin Yves, CIRAD-AMIS-UMR LSTM (FRA) ORCID: 0000-0002-3706-0045
  • De Faria Sergio Miana, EMBRAPA (BRA)
  • Bouvet Jean-Marc, CIRAD-FORET-UPR Génétique forestière (FRA)
  • Sylla Samba, UCAD (SEN)
  • Dreyfus Bernard, IRD (FRA)
  • Bâ Amadou Moustapha, UAG (GLP)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/538987/)

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