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Nodulation of Aeschynomene afraspera and A. indica by photosynthetic Bradyrhizobium Sp. Strain ORS285 : The nod-dependent versus the nod-independent symbiotic interaction

Bonaldi Katia, Gargani Daniel, Prin Yves, Fardoux Joël, Gully Djamel, Nouwen Nico, Goormachtig Sofie, Giraud Eric. 2011. Nodulation of Aeschynomene afraspera and A. indica by photosynthetic Bradyrhizobium Sp. Strain ORS285 : The nod-dependent versus the nod-independent symbiotic interaction. Molecular Plant-Microbe Interactions, 24 (11) : pp. 1359-1371.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : PLANT SCIENCES / Quartile : Q1, Sujet : BIOTECHNOLOGY & APPLIED MICROBIOLOGY / Quartile : Q1, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY

Abstract : Here, we present a comparative analysis of the nodulation processes of Aeschynomene afraspera and A. indica that differ in their requirement for Nod factors (NF) to initiate symbiosis with photosynthetic bradyrhizobia. The infection process and nodule organogenesis was examined using the green fluorescent protein-labeled Bradyrhizobium sp. strain ORS285 able to nodulate both species. In A. indica, when the NF-independent strategy is used, bacteria penetrated the root intercellularly between axillary root hairs and invaded the subepidermal cortical cells by invagination of the host cell wall. Whereas the first infected cortical cells collapsed, the infected ones immediately beneath kept their integrity and divided repeatedly to form the nodule. In A. afraspera, when the NF-dependent strategy is used, bacteria entered the plant through epidermal fissures generated by the emergence of lateral roots and spread deeper intercellularly in the root cortex, infecting some cortical cells during their progression. Whereas the infected cells of the lower cortical layers divided rapidly to form the nodule, the infected cells of the upper layers gave rise to an outgrowth in which the bacteria remained enclosed in large tubular structures. Together, two distinct modes of infection and nodule organogenesis coexist in Aeschynomene legumes, each displaying original features. (Résumé d'auteur)

Mots-clés Agrovoc : Bradyrhizobium, Aeschynomène

Mots-clés complémentaires : Aeschynomene afraspera, Aeschynomene indica

Classification Agris : F62 - Plant physiology - Growth and development

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

Auteurs et affiliations

  • Bonaldi Katia, IRD (FRA)
  • Gargani Daniel, CIRAD-BIOS-UMR BGPI (FRA)
  • Prin Yves, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-3706-0045
  • Fardoux Joël, IRD (FRA)
  • Gully Djamel, IRD (FRA)
  • Nouwen Nico, IRD (FRA)
  • Goormachtig Sofie, Flanders Interuniversity Institute for Biotechnology (BEL)
  • Giraud Eric, IRD (FRA)

Autres liens de la publication

Source : Cirad - Agritrop (https://agritrop.cirad.fr/562821/)

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