Journal ArticleDOI
Nitrogen-fixing symbiosis between photosynthetic bacteria and legumes
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TLDR
It is observed that infrared light stimulates nitrogen fixation in nodules containing photosynthetic bacteroids, suggesting that photosynthesis may additionally provides energy for nitrogen fixation, allowing for more efficient plant growth.Abstract:
Rhizobia having photosynthetic systems form nitrogen-fixing nodules on the stem and/or root of some species of the legumes Aeschynomene and Lotononis. This review is focused on the recent knowledge about the physiology, genetics and role of the photosystem in these bacteria. Photosynthetic electron transport seems to involve reaction centers, soluble cytochrome c2 and cytochrome bc1. Anaerobically, the electron transport system becomes over-reduced. The photosynthesis genes have been partially characterized; their organization is classical but their regulation is unusual as it is activated by far-red light via a bacteriophytochrome. This original mechanism of regulation seems well adapted to promote photosynthesis during stem symbiosis. Photosynthesis plays a major role in the efficiency of stem nodulation. It is also observed that infrared light stimulates nitrogen fixation in nodules containing photosynthetic bacteroids, suggesting that photosynthesis may additionally provides energy for nitrogen fixation, allowing for more efficient plant growth. Other aspects of these bacteria are discussed, in particular their taxonomic position and nodulation ability, the role of carotenoids and the potential for application of photosynthetic rhizobia in rice culture.read more
Citations
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Journal ArticleDOI
Legumes Symbioses: Absence of Nod Genes in Photosynthetic Bradyrhizobia
Eric Giraud,Lionel Moulin,David Vallenet,Valérie Barbe,Eddie Cytryn,Jean-Christophe Avarre,Marianne Jaubert,Damien Simon,Fabienne Cartieaux,Yves Prin,Gilles Béna,Laura Hannibal,Joël Fardoux,Mila Kojadinovic,Laurie Vuillet,Aurélie Lajus,Stéphane Cruveiller,Zoé Rouy,Sophie Mangenot,Béatrice Segurens,Carole Dossat,William L. Franck,Woo Suk Chang,Elizabeth Saunders,David Bruce,Paul G. Richardson,Philippe Normand,Bernard Dreyfus,David Pignol,Gary Stacey,David W. Emerich,André Verméglio,Claudine Médigue,Michael J. Sadowsky +33 more
TL;DR: It is shown by complete genome sequencing of two symbiotic, photosynthetic, Bradyrhizobium strains, BTAi1 and ORS278, that canonical nodABC genes and typical lipochito-oligosaccharidic Nod factors are not required for symbiosis in some legumes.
Journal ArticleDOI
Establishing nitrogen-fixing symbiosis with legumes: how many rhizobium recipes?
TL;DR: The cumulative evidence from recent genomic and genetic analyses pointing toward an unexpected variety of mechanisms that lead to symbiosis with legumes is reviewed.
Journal ArticleDOI
Symbiotic use of pathogenic strategies: rhizobial protein secretion systems.
TL;DR: One group of proteins secreted by rhizobia have homologues in bacterial pathogens and may have been co-opted by rhzobia for symbiotic purposes.
Journal ArticleDOI
Metabolic changes of rhizobia in legume nodules.
Juergen Prell,Philip S. Poole +1 more
TL;DR: The metabolic plasticity of rhizobia and the importance of amino acid cycling are summarized.
Journal ArticleDOI
Contributions of anoxygenic and oxygenic phototrophy and chemolithotrophy to carbon and oxygen fluxes in aquatic environments.
TL;DR: The analysis presented here briefly considers the occur- rence and metabolism of other autotrophs sensu lato, i.e. not just the organisms with an autotrophic inorganic carbon assimilation machinery, and whether these organisms influence food webs by increasing the rate, or efficiency, of conversion of dissolved organic carbon ultimately derived from autotulent inorganiccarbon assimilation into particulate organic carbon.
References
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Journal ArticleDOI
Structure of the protein subunits in the photosynthetic reaction centre of Rhodopseudomonas viridis at 3Å resolution
TL;DR: The molecular structure of the photosynthetic reaction centre from Rhodopseudomonas viridis has been elucidated using X-ray crystallographic analysis and the first description of the high-resolution structure of an integral membrane protein is presented.
Journal ArticleDOI
Phytochromes and light signal perception by plants—an emerging synthesis
TL;DR: An interim synthesis of the phytochromes, a small family of diverse photochromic protein photoreceptors whose origins have been traced to the photosynthetic prokaryotes, is proposed.
Journal ArticleDOI
Molecular Basis of Symbiotic Promiscuity
TL;DR: It is suggested that restricted host ranges are limited to specific niches and represent specialization of widespread and more ancestral promiscuous symbioses.
Journal ArticleDOI
Rhizobium Lipo-Chitooligosaccharide Nodulation Factors: Signaling Molecules Mediating Recognition and Morphogenesis
TL;DR: This review summarizes the current knowledge on the biosynthesis, structure, and function of this new class of signaling molecules and discusses the possibility that these signals could be part of a new family of plant lipo-chitooligosaccharide growth regulators.
Journal ArticleDOI
Phytochromes: photosensory perception and signal transduction
TL;DR: The phytochrome family of photoreceptors monitors the light environment and dictates patterns of gene expression that enable the plant to optimize growth and development in accordance with prevailing conditions.
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Legumes Symbioses: Absence of Nod Genes in Photosynthetic Bradyrhizobia
Eric Giraud,Lionel Moulin,David Vallenet,Valérie Barbe,Eddie Cytryn,Jean-Christophe Avarre,Marianne Jaubert,Damien Simon,Fabienne Cartieaux,Yves Prin,Gilles Béna,Laura Hannibal,Joël Fardoux,Mila Kojadinovic,Laurie Vuillet,Aurélie Lajus,Stéphane Cruveiller,Zoé Rouy,Sophie Mangenot,Béatrice Segurens,Carole Dossat,William L. Franck,Woo Suk Chang,Elizabeth Saunders,David Bruce,Paul G. Richardson,Philippe Normand,Bernard Dreyfus,David Pignol,Gary Stacey,David W. Emerich,André Verméglio,Claudine Médigue,Michael J. Sadowsky +33 more