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What contribution of plant immune responses in Alnus glutinosa-Frankia symbiotic interactions?

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Abstract

Many reviews report induction of defence genes similar with pathogenesis in legume-rhizobia and mycorrhizal symbioses, suggesting it could be a convergent point in plant-microorganism symbiotic systems. However, research in actinorhizal symbiosis versus pathogenesis is still in early stages and much remains to be learned to confirm this hypothesis. Here, we review studies on plant immune system in actinorhizal symbiosis, focusing on Alnus glutinosa, one of the best studied actinorhizal plants, for which genomic and transcriptomic data have recently been published. This review draws up the first overview of plant immune reactions during the Frankia-Alnus symbiosis and summarises all evidence of (i) a putative transient expression of defence genes during the early steps of symbiosis establishment in Alnus-Frankia interactions, and (ii) defence genes highly expressed in mature and functional root nodules in which the microbial partner is hosted. These genes are related to three main host plant stress response categories: oxidative stress response, Pathogenesis-Related (PR) proteins and Systemic Acquired Resistance (SAR). Their putative key role in plant–microbe interactions is discussed, with the major challenge being to understand to what extent they would be related to symbiosis, to stress response, or both.

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Acknowledgements

M. Vincent is granted a doctoral fellowship by the Ministry of Higher Education and Research (MESR, France). This review is part of a project supported by the French National program EC2CO (Ecosphère Continentale et Côtière). The authors thank Benjamin Gourion (Laboratoire des Interactions Plantes—Microbes—Environnement—Université Toulouse III Paul Sabatier, CNRS) for his advices and Cyril Libourel (Laboratoire de Recherche en Sciences Végétales—Université Toulouse III Paul Sabatier, CNRS) for his help in researching orthologs of defence genes in the Medicago truncatula genome.

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VM, BH, HAE and HBA conceptualised the review. VM generated the bibliography atlas of plant defence genes in pathogenic and symbiotic models, and conducted A. glutinosa transcriptomic and genomic data exploration with the help of BH and GM. VM and HBA wrote the manuscript with all authors' contributions.

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Correspondence to Aude Herrera-Belaroussi.

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Vincent, M., Boubakri, H., Gasser, M. et al. What contribution of plant immune responses in Alnus glutinosa-Frankia symbiotic interactions?. Symbiosis 89, 27–52 (2023). https://doi.org/10.1007/s13199-022-00889-2

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  • DOI: https://doi.org/10.1007/s13199-022-00889-2

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