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Adaptations and growth responses of nodulated and mycorrhizal Pterocapus officinalis (Jacq.) seedlings to waterlogging

Fougnies Laétitia, Renciot Sabrina, Muller Félix, Dulormne Maguy, Prin Yves, Le Roux Christine, Bouvet Jean-Marc, Béna Gilles, Dreyfus Bernard, Toribio Armel, Plenchette Christian, Bâ Amadou Moustapha. 2004. Adaptations and growth responses of nodulated and mycorrhizal Pterocapus officinalis (Jacq.) seedlings to waterlogging. In : 11th Congress of African association for biological nitrogen fixation: Impact of biological nitrogen fixation on agricultural development in Africa (Abstracts), November 22-27, 2004, Dakar, Sénégal. s.l. : s.n., Résumé, p. 84. Congrès de l'AABNF. 11, Dakar, Sénégal, 22 November 2004/27 November 2004.

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Abstract : Pterocarpus officinalis (Jack.) (Fabaceae) is the dominant tree species in the seasonally flooded swamp forests of Guadeloupe (Lesser Antilles). Here, we determined how P. officinalis seedlings and their symbionts were able to develop under waterlogging. A pot experiment was conducted to study the interactive effects of inoculation and waterlogging on nodulation, mycorrhizal colonization, nitrogen fixation, N contents in leaves and growth of P. officinalis seedlings. For this, they were inoculated at sowing with one strain of Bradyrhizobium sp. and/or with one arbuscular mycorrhizal fungus, Gloms infra radices, and watered near the field capacity until they were 3 weeks old. Then the half of the seedlings were waterlogged by marking up water level daily up to 3 cm above the soil surface. After 13 weeks of flooding, all flooded plants had developed adventitious roots and hypertrophied lenticels on the submerged part of the stem above the soil surface, and, however, grown better than non-flooded plants. In addition to their adaptation to flooding, the flooded plants formed true stem nodules, as they are connected vascularly to the stem, and arbuscular mycorrhizas on adventitious roots arising from the stem. Nodulatidn, nitrogen fixation, and N contents in leaves were not stimulated by flooding, whereas mycorrhizal colonization was. Mycorrhizal Pterocarpus seedlings adapted to flooding better than non-inoculated seedlings. This was achieved by the greater development of plant biomass. These results suggest that the adventitious roots and hypertrophied lenticels on stems are an important adaptation for flooding tolerance of P. officinalis seedlings, and probably contribute to the development of mycorrhizal colonization and plant growth. (Texte intégral)

Mots-clés Agrovoc : Système racinaire, Formation de nodosités, Mycorhizé, Engorgement du sol, Inondation, Fixation de l'azote, Racine, Relation plante sol, Réponse de la plante

Classification Agris : P34 - Soil biology
F61 - Plant physiology - Nutrition

Auteurs et affiliations

  • Fougnies Laétitia, UAG (GLP)
  • Renciot Sabrina, UAG (GLP)
  • Muller Félix, UAG (GLP)
  • Dulormne Maguy, UAG (GLP)
  • Prin Yves, CIRAD-FORET-PLANTATIONS (FRA) ORCID: 0000-0002-3706-0045
  • Le Roux Christine, CIRAD-FORET-PLANTATIONS (FRA) ORCID: 0000-0003-0668-3589
  • Bouvet Jean-Marc, CIRAD-FORET-PLANTATIONS (FRA)
  • Béna Gilles, CIRAD-AMIS-UMR LSTM (FRA)
  • Dreyfus Bernard, IRD (FRA)
  • Toribio Armel, INRA (GLP)
  • Plenchette Christian, INRA (FRA)
  • Bâ Amadou Moustapha, UAG (GLP)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/535596/)

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