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Carro L, Pujic P, Alloisio N, Fournier P, Boubakri H, Poly F, Rey M, Heddi A, Normand P. Physiological effects of major up-regulated Alnus glutinosa peptides on Frankia sp. ACN14a. Microbiology (Reading) 2016; 162:1173-1184. [DOI: 10.1099/mic.0.000291] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Affiliation(s)
- Lorena Carro
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, 69622 Cedex, France
| | - Petar Pujic
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, 69622 Cedex, France
| | - Nicole Alloisio
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, 69622 Cedex, France
| | - Pascale Fournier
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, 69622 Cedex, France
| | - Hasna Boubakri
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, 69622 Cedex, France
| | - Franck Poly
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, 69622 Cedex, France
| | - Marjolaine Rey
- Université de Lyon, INSA Lyon, INRA, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Villeurbanne, 69622 Cedex, France
| | - Abdelaziz Heddi
- Université de Lyon, INSA Lyon, INRA, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Villeurbanne, 69622 Cedex, France
| | - Philippe Normand
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, 69622 Cedex, France
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Carro L, Pujic P, Alloisio N, Fournier P, Boubakri H, Hay AE, Poly F, François P, Hocher V, Mergaert P, Balmand S, Rey M, Heddi A, Normand P. Alnus peptides modify membrane porosity and induce the release of nitrogen-rich metabolites from nitrogen-fixing Frankia. THE ISME JOURNAL 2015; 9:1723-33. [PMID: 25603394 PMCID: PMC4511928 DOI: 10.1038/ismej.2014.257] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 11/20/2014] [Accepted: 11/30/2014] [Indexed: 12/11/2022]
Abstract
Actinorhizal plant growth in pioneer ecosystems depends on the symbiosis with the nitrogen-fixing actinobacterium Frankia cells that are housed in special root organs called nodules. Nitrogen fixation occurs in differentiated Frankia cells known as vesicles. Vesicles lack a pathway for assimilating ammonia beyond the glutamine stage and are supposed to transfer reduced nitrogen to the plant host cells. However, a mechanism for the transfer of nitrogen-fixation products to the plant cells remains elusive. Here, new elements for this metabolic exchange are described. We show that Alnus glutinosa nodules express defensin-like peptides, and one of these, Ag5, was found to target Frankia vesicles. In vitro and in vivo analyses showed that Ag5 induces drastic physiological changes in Frankia, including an increased permeability of vesicle membranes. A significant release of nitrogen-containing metabolites, mainly glutamine and glutamate, was found in N2-fixing cultures treated with Ag5. This work demonstrates that the Ag5 peptide is central for Frankia physiology in nodules and uncovers a novel cellular function for this large and widespread defensin peptide family.
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Affiliation(s)
- Lorena Carro
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
| | - Petar Pujic
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
| | - Nicole Alloisio
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
| | - Pascale Fournier
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
| | - Hasna Boubakri
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
| | - Anne E Hay
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
| | - Franck Poly
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
| | - Philippe François
- Equipe Rhizogenèse, UMR DIADE (IRD, UM2), Institut de Recherche pour le Développement, Montpellier, France
| | - Valerie Hocher
- Equipe Rhizogenèse, UMR DIADE (IRD, UM2), Institut de Recherche pour le Développement, Montpellier, France
| | - Peter Mergaert
- Institut des Sciences du Végétal, CNRS, UPR 2355, Gif-sur-Yvette, France
| | - Severine Balmand
- INSA-Lyon, INRA, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Villeurbanne, France
| | - Marjolaine Rey
- INSA-Lyon, INRA, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Villeurbanne, France
| | - Abdelaziz Heddi
- INSA-Lyon, INRA, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Villeurbanne, France
| | - Philippe Normand
- Université Lyon 1, Université de Lyon, CNRS, Ecologie Microbienne, UMR 5557, Villeurbanne, France
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Berry AM, Murphy TM, Okubara PA, Jacobsen KR, Swensen SM, Pawlowski K. Novel expression pattern of cytosolic Gln synthetase in nitrogen-fixing root nodules of the actinorhizal host, Datisca glomerata. PLANT PHYSIOLOGY 2004; 135:1849-62. [PMID: 15247391 PMCID: PMC519095 DOI: 10.1104/pp.103.031534] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2003] [Revised: 04/14/2004] [Accepted: 05/02/2004] [Indexed: 05/24/2023]
Abstract
Gln synthetase (GS) is the key enzyme of primary ammonia assimilation in nitrogen-fixing root nodules of legumes and actinorhizal (Frankia-nodulated) plants. In root nodules of Datisca glomerata (Datiscaceae), transcripts hybridizing to a conserved coding region of the abundant nodule isoform, DgGS1-1, are abundant in uninfected nodule cortical tissue, but expression was not detectable in the infected zone or in the nodule meristem. Similarly, the GS holoprotein is immunolocalized exclusively to the uninfected nodule tissue. Phylogenetic analysis of the full-length cDNA of DgGS1-1 indicates affinities with cytosolic GS genes from legumes, the actinorhizal species Alnus glutinosa, and nonnodulating species, Vitis vinifera and Hevea brasilensis. The D. glomerata nodule GS expression pattern is a new variant among reported root nodule symbioses and may reflect an unusual nitrogen transfer pathway from the Frankia nodule microsymbiont to the plant infected tissue, coupled to a distinctive nitrogen cycle in the uninfected cortical tissue. Arg, Gln, and Glu are the major amino acids present in D. glomerata nodules, but Arg was not detected at high levels in leaves or roots. Arg as a major nodule nitrogen storage form is not found in other root nodule types except in the phylogenetically related Coriaria. Catabolism of Arg through the urea cycle could generate free ammonium in the uninfected tissue where GS is expressed.
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Affiliation(s)
- Alison M Berry
- Department of Environmental Horticulture, University of California, Davis, California 95616, USA.
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Hua Z, Jian D, Zhongze Z, Xuenong Z. Nitrogen metabolism of Frankia strain, Cc01, Mg+, At4 and Hr18. Arch Microbiol 1993. [DOI: 10.1007/bf00249032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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