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Original Research ARTICLE

Front. Microbiol. | doi: 10.3389/fmicb.2017.00720

Host plant compatibility shapes the proteogenome of Frankia coriariae

  • 1University Tunis El Manar, Tunisia
  • 2CEA-Marcoule, France
  • 3University of North Bengal, India

Molecular signaling networks in the actinorhizal rhizosphere select host-compatible Frankia strains trigger the infection process and eventually the genesis of nitrogen-fixing nodules. The molecular triggers involved remain difficult to ascertain. Root exudates (RE) are highly dy-namic substrates that play key roles in establishing the rhizosphere microbiome. RE are known to induce the secretion by rhizobia of Nod factors, polysaccharides, and other proteins in the case of legume symbiosis. Next-generation proteomic approach was here used to decipher the key bacterial signals matching the first-step recognition of host plant stimuli upon treatment of Frankia coriariae strain BMG5.1 with RE derived from compatible (Coriaria myrtifolia), incompatible (Alnus glutinosa), and non-actinorhizal (Cucumis melo) host plants. The Frankia proteome dynamics were mainly driven by host compatibility. Both metabolism and signal transduction are the dominant activities for BMG5.1 under the different RE conditions tested. A second set of proteins that were solely induced by C. myrtifolia RE and were mainly linked to cell wall remodeling, signal transduction and host signal processing activities. These proteins may footprint early steps in receptive recognition of host stimuli before subsequent events of symbiotic recruitment.

Keywords: root exudates, Frankia, Proteogenome, Symbiosis, Signaling Pathways

Citation: Ktari A, Gueddou A, Nouioui I, Miotello G, Sarkar I, Ghodhbane-Gtari F, Sen A, Armengaud J and Gtari M (2017). Host plant compatibility shapes the proteogenome of Frankia coriariae. Front. Microbiol. 8:720. doi: 10.3389/fmicb.2017.00720

Received: 10 Jan 2017; Accepted: 06 Apr 2017.

Edited by:

Benjamin Gourion, UMR2594 Laboratoire des Interactions Plantes Microorganismes (LIPM), France

Reviewed by:

Hassen GHERBI, Institut de recherche pour le développement, France
Gabriella Pessi, University of Zurich, Switzerland  

Copyright: © 2017 Ktari, Gueddou, Nouioui, Miotello, Sarkar, Ghodhbane-Gtari, Sen, Armengaud and Gtari. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Maher Gtari, University Tunis El Manar, Tunis, Tunisia, maher.gtari@fst.rnu.tn