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Boscari A, Meilhoc E, Castella C, Bruand C, Puppo A, Brouquisse R. Which role for nitric oxide in symbiotic N2-fixing nodules: toxic by-product or useful signaling/metabolic intermediate? FRONTIERS IN PLANT SCIENCE 2013; 4:384. [PMID: 24130563 PMCID: PMC3793596 DOI: 10.3389/fpls.2013.00384] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Accepted: 09/10/2013] [Indexed: 05/08/2023]
Abstract
The interaction between legumes and rhizobia leads to the establishment of a symbiotic relationship characterized by the formation of new organs called nodules, in which bacteria have the ability to fix atmospheric nitrogen (N2) via the nitrogenase activity. Significant nitric oxide (NO) production was evidenced in the N2-fixing nodules suggesting that it may impact the symbiotic process. Indeed, NO was shown to be a potent inhibitor of nitrogenase activity and symbiotic N2 fixation. It has also been shown that NO production is increased in hypoxic nodules and this production was supposed to be linked - via a nitrate/NO respiration process - with improved capacity of the nodules to maintain their energy status under hypoxic conditions. Other data suggest that NO might be a developmental signal involved in the induction of nodule senescence. Hence, the questions were raised of the toxic effects versus signaling/metabolic functions of NO, and of the regulation of NO levels compatible with nitrogenase activity. The present review analyses the different roles of NO in functioning nodules, and discusses the role of plant and bacterial (flavo)hemoglobins in the control of NO level in nodules.
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Affiliation(s)
- Alexandre Boscari
- Institut National de la Recherche Agronomique, Institut Sophia Agrobiotech, UMR 1355Sophia Antipolis, France
- Centre National de la Recherche Scientifique, Institut Sophia Agrobiotech, UMR 7254Sophia Antipolis, France
- Institut Sophia Agrobiotech, Université Nice Sophia AntipolisSophia Antipolis, France
| | - Eliane Meilhoc
- Institut National de la Recherche Agronomique, Laboratoire des Interactions Plantes-Microorganismes, UMR441Castanet-Tolosan, France
- Centre National de la Recherche Scientifique, Laboratoire des Interactions Plantes-Microorganismes, UMR2594Castanet-Tolosan, France
| | - Claude Castella
- Institut National de la Recherche Agronomique, Institut Sophia Agrobiotech, UMR 1355Sophia Antipolis, France
- Centre National de la Recherche Scientifique, Institut Sophia Agrobiotech, UMR 7254Sophia Antipolis, France
- Institut Sophia Agrobiotech, Université Nice Sophia AntipolisSophia Antipolis, France
| | - Claude Bruand
- Institut National de la Recherche Agronomique, Laboratoire des Interactions Plantes-Microorganismes, UMR441Castanet-Tolosan, France
- Centre National de la Recherche Scientifique, Laboratoire des Interactions Plantes-Microorganismes, UMR2594Castanet-Tolosan, France
| | - Alain Puppo
- Institut National de la Recherche Agronomique, Institut Sophia Agrobiotech, UMR 1355Sophia Antipolis, France
- Centre National de la Recherche Scientifique, Institut Sophia Agrobiotech, UMR 7254Sophia Antipolis, France
- Institut Sophia Agrobiotech, Université Nice Sophia AntipolisSophia Antipolis, France
| | - Renaud Brouquisse
- Institut National de la Recherche Agronomique, Institut Sophia Agrobiotech, UMR 1355Sophia Antipolis, France
- Centre National de la Recherche Scientifique, Institut Sophia Agrobiotech, UMR 7254Sophia Antipolis, France
- Institut Sophia Agrobiotech, Université Nice Sophia AntipolisSophia Antipolis, France
- *Correspondence: Renaud Brouquisse, UMR INRA 1355 - CNRS 7254 - Université Nice Sophia Antipolis - Interactions Biotiques et Santé Végétale, Institut Agrobiotech, 400 route des Chappes, BP 167, 06903, Sophia Antipolis Cedex, France e-mail:
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102
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Frendo P, Matamoros MA, Alloing G, Becana M. Thiol-based redox signaling in the nitrogen-fixing symbiosis. FRONTIERS IN PLANT SCIENCE 2013; 4:376. [PMID: 24133498 PMCID: PMC3783977 DOI: 10.3389/fpls.2013.00376] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 09/03/2013] [Indexed: 05/04/2023]
Abstract
In nitrogen poor soils legumes establish a symbiotic interaction with rhizobia that results in the formation of root nodules. These are unique plant organs where bacteria differentiate into bacteroids, which express the nitrogenase enzyme complex that reduces atmospheric N 2 to ammonia. Nodule metabolism requires a tight control of the concentrations of reactive oxygen and nitrogen species (RONS) so that they can perform useful signaling roles while avoiding nitro-oxidative damage. In nodules a thiol-dependent regulatory network that senses, transmits and responds to redox changes is starting to be elucidated. A combination of enzymatic, immunological, pharmacological and molecular analyses has allowed us to conclude that glutathione and its legume-specific homolog, homoglutathione, are abundant in meristematic and infected cells, that their spatio-temporally distribution is correlated with the corresponding (homo)glutathione synthetase activities, and that they are crucial for nodule development and function. Glutathione is at high concentrations in the bacteroids and at moderate amounts in the mitochondria, cytosol and nuclei. Less information is available on other components of the network. The expression of multiple isoforms of glutathione peroxidases, peroxiredoxins, thioredoxins, glutaredoxins and NADPH-thioredoxin reductases has been detected in nodule cells using antibodies and proteomics. Peroxiredoxins and thioredoxins are essential to regulate and in some cases to detoxify RONS in nodules. Further research is necessary to clarify the regulation of the expression and activity of thiol redox-active proteins in response to abiotic, biotic and developmental cues, their interactions with downstream targets by disulfide-exchange reactions, and their participation in signaling cascades. The availability of mutants and transgenic lines will be crucial to facilitate systematic investigations into the function of the various proteins in the legume-rhizobial symbiosis.
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Affiliation(s)
- Pierre Frendo
- Institut Sophia Agrobiotech, Université de Nice-Sophia AntipolisNice, France
- Institut Sophia Agrobiotech, Institut National de la Recherche Agronomique, Unité Mixte de Recherches 1355Nice, France
- Institut Sophia Agrobiotech, Centre National de la Recherche Scientifique, Unité Mixte de Recherches 7254Nice, France
- Pierre Frendo and Manuel A. Matamoros have contributed equally to this review.
| | - Manuel A. Matamoros
- Estación Experimental de Aula Dei, Consejo Superior de Investigaciones CientíficasZaragoza, Spain
- Pierre Frendo and Manuel A. Matamoros have contributed equally to this review.
| | - Geneviève Alloing
- Institut Sophia Agrobiotech, Université de Nice-Sophia AntipolisNice, France
- Institut Sophia Agrobiotech, Institut National de la Recherche Agronomique, Unité Mixte de Recherches 1355Nice, France
- Institut Sophia Agrobiotech, Centre National de la Recherche Scientifique, Unité Mixte de Recherches 7254Nice, France
| | - Manuel Becana
- Estación Experimental de Aula Dei, Consejo Superior de Investigaciones CientíficasZaragoza, Spain
- *Correspondence: Manuel Becana, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas, Apartado 13034, 50080 Zaragoza, Spain e-mail:
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103
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Scheler C, Durner J, Astier J. Nitric oxide and reactive oxygen species in plant biotic interactions. CURRENT OPINION IN PLANT BIOLOGY 2013; 16:534-9. [PMID: 23880111 DOI: 10.1016/j.pbi.2013.06.020] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 06/25/2013] [Accepted: 06/28/2013] [Indexed: 05/03/2023]
Abstract
Nitric oxide (NO) and reactive oxygen species (ROS) are important signaling molecules in plants. Recent progress has been made in defining their role during plant biotic interactions. Over the last decade, their function in disease resistance has been highlighted and focused a lot of investigations. Moreover, NO and ROS have recently emerged as important players of defense responses after herbivore attacks. Besides their role in plant adaptive response development, NO and ROS have been demonstrated to be involved in symbiotic interactions between plants and microorganisms. Here we review recent data concerning these three sides of NO and ROS functions in plant biotic interactions.
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Affiliation(s)
- Claudia Scheler
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
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Bonneau L, Huguet S, Wipf D, Pauly N, Truong HN. Combined phosphate and nitrogen limitation generates a nutrient stress transcriptome favorable for arbuscular mycorrhizal symbiosis in Medicago truncatula. THE NEW PHYTOLOGIST 2013; 199:188-202. [PMID: 23506613 DOI: 10.1111/nph.12234] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 02/17/2013] [Indexed: 05/20/2023]
Abstract
Arbuscular mycorrhizal (AM) symbiosis is stimulated by phosphorus (P) limitation and contributes to P and nitrogen (N) acquisition. However, the effects of combined P and N limitation on AM formation are largely unknown. Medicago truncatula plants were cultivated in the presence or absence of Rhizophagus irregularis (formerly Glomus intraradices) in P-limited (LP), N-limited (LN) or combined P- and N-limited (LPN) conditions, and compared with plants grown in sufficient P and N. The highest AM formation was observed in LPN, linked to systemic signaling by the plant nutrient status. Plant free phosphate concentrations were higher in LPN than in LP, as a result of cross-talk between P and N. Transcriptome analyses suggest that LPN induces the activation of NADPH oxidases in roots, concomitant with an altered profile of plant defense genes and a coordinate increase in the expression of genes involved in the methylerythritol phosphate and isoprenoid-derived pathways, including strigolactone synthesis genes. Taken together, these results suggest that low P and N fertilization systemically induces a physiological state of plants favorable for AM symbiosis despite their higher P status. Our findings highlight the importance of the plant nutrient status in controlling plant-fungus interaction.
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Affiliation(s)
- Laurent Bonneau
- UMR 1347 Agroécologie INRA/Université de Bourgogne/Agrosup, Pôle Interactions Plantes-Microorganismes ERL CNRS 6300, 17 rue Sully, BP 86510, 21065, Dijon Cedex, France
| | - Stéphanie Huguet
- Unité de Recherche en Génomique Végétale (URGV), UMR INRA 1165 - Université d'Evry Val d'Essonne - ERL CNRS 8196, 2 rue G. Crémieux, CP 5708, F-91057, Evry Cedex, France
| | - Daniel Wipf
- UMR 1347 Agroécologie INRA/Université de Bourgogne/Agrosup, Pôle Interactions Plantes-Microorganismes ERL CNRS 6300, 17 rue Sully, BP 86510, 21065, Dijon Cedex, France
| | - Nicolas Pauly
- Institut Sophia Agrobiotech, UMR INRA 1355 CNRS 7254, Université de Nice-Sophia Antipolis, 400 Route des Chappes, BP 167, F-06903, Sophia Antipolis Cedex, France
| | - Hoai-Nam Truong
- UMR 1347 Agroécologie INRA/Université de Bourgogne/Agrosup, Pôle Interactions Plantes-Microorganismes ERL CNRS 6300, 17 rue Sully, BP 86510, 21065, Dijon Cedex, France
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105
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Silva L, Carvalho H. Possible role of glutamine synthetase in the NO signaling response in root nodules by contributing to the antioxidant defenses. FRONTIERS IN PLANT SCIENCE 2013; 4:372. [PMID: 24065976 PMCID: PMC3777134 DOI: 10.3389/fpls.2013.00372] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Accepted: 08/31/2013] [Indexed: 05/08/2023]
Abstract
Nitric oxide (NO) is emerging as an important regulatory player in the Rhizobium-legume symbiosis. The occurrence of NO during several steps of the symbiotic interaction suggests an important, but yet unknown, signaling role of this molecule for root nodule formation and functioning. The identification of the molecular targets of NO is key for the assembly of the signal transduction cascade that will ultimately help to unravel NO function. We have recently shown that the key nitrogen assimilatory enzyme glutamine synthetase (GS) is a molecular target of NO in root nodules of Medicago truncatula, being post-translationally regulated by tyrosine nitration in relation to nitrogen fixation. In functional nodules of M. truncatula NO formation has been located in the bacteroid containing cells of the fixation zone, where the ammonium generated by bacterial nitrogenase is released to the plant cytosol and assimilated into the organic pools by plant GS. We propose that the NO-mediated GS post-translational inactivation is connected to nitrogenase inhibition induced by NO and is related to metabolite channeling to boost the nodule antioxidant defenses. Glutamate, a substrate for GS activity is also the precursor for the synthesis of glutathione (GSH), which is highly abundant in root nodules of several plant species and known to play a major role in the antioxidant defense participating in the ascorbate/GSH cycle. Existing evidence suggests that upon NO-mediated GS inhibition, glutamate could be channeled for the synthesis of GSH. According to this hypothesis, GS would be involved in the NO-signaling responses in root nodules and the NO-signaling events would meet the nodule metabolic pathways to provide an adaptive response to the inhibition of symbiotic nitrogen fixation by reactive nitrogen species.
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Affiliation(s)
| | - Helena Carvalho
- *Correspondence: Helena Carvalho, Laboratório de Biologia Molecular da Assimilação do Azoto, Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal e-mail:
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