Key Molecules Involved in Beneficial Infection Process in Rhizobia–Legume Symbiosis

Peix, Álvaro; Velázquez, Encarna; Silva, Luís; Mateos, Pedro F.

doi:10.1007/978-3-211-99753-6_3

Cited by 10 publications

(7 citation statements)

References 171 publications

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“…The nitrogen fixation is carried out by rhizobial bacteroids which are the final step of an infection process in which several molecules from both bacteria and plant are involved [12],[18]. This process is mediated by the nitrogenase from the bacteroids which needs a microaerophilic environment facilitated by the leghaemoglobin, a legume protein which removes the oxygen from the symbiosomes and whose expression is observed by the presence of a pink colour in the nodules indicating an effective symbiosis [19].…”

Section: Rhizobia-legume Symbiosismentioning

confidence: 99%

“…One of the most particular characteristics of legumes is their ability to fix atmospheric nitrogen in symbiosis with soil bacteria which are called rhizobia currently distributed in several families and genera [11]. These bacteria induce nodules in legume roots or stems where the nitrogen fixation takes place after the infection process, which included several steps [12]. From colonization to nodule organogenesis different molecules from legumes and bacteria are involved, such as cellulose, cellulases, polysaccharides, lectins, nodulins, flavonoids, etc.…”

Section: Introductionmentioning

confidence: 99%

“…From colonization to nodule organogenesis different molecules from legumes and bacteria are involved, such as cellulose, cellulases, polysaccharides, lectins, nodulins, flavonoids, etc. [12]. After nodule formation, the rhizobial cells are released into the plant cells and they are transformed into bacteroids which are able to fix atmospheric nitrogen, a process also involving plant and bacterial proteins, such as leghemoglobins and nitrogenases [12].…”

Section: Introductionmentioning

confidence: 99%

“…[12]. After nodule formation, the rhizobial cells are released into the plant cells and they are transformed into bacteroids which are able to fix atmospheric nitrogen, a process also involving plant and bacterial proteins, such as leghemoglobins and nitrogenases [12].…”

Section: Introductionmentioning

confidence: 99%

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Legume bioactive compounds: influence of rhizobial inoculation

et al. 2017

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Legumes consumption has been recognized as beneficial for human health, due to their content in proteins, fiber, minerals and vitamins, and their cultivation as beneficial for sustainable agriculture due to their ability to fix atmospheric nitrogen in symbiosis with soil bacteria known as rhizobia. The inoculation with these baceria induces metabolic changes in the plant, from which the more studied to date are the increases in the nitrogen and protein contents, and has been exploited in agriculture to improve the crop yield of several legumes. Nevertheless, legumes also contain several bioactive compounds such as polysaccharides, bioactive peptides, isoflavones and other phenolic compounds, carotenoids, tocopherols and fatty acids, which makes them functional foods included into the nutraceutical products. Therefore, the study of the effect of the rhizobial inoculation in the legume bioactive compounds content is gaining interest in the last decade. Several works reported that the inoculation of different genera and species of rhizobia in several grain legumes, such as soybean, cowpea, chickpea, faba bean or peanut, produced increases in the antioxidant potential and in the content of some bioactive compounds, such as phenolics, flavonoids, organic acids, proteins and fatty acids. Therefore, the rhizobial inoculation is a good tool to enhance the yield and quality of legumes and further studies on this field will allow us to have plant probiotic bacteria that promote the plant growth of legumes improving their functionality.

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Section: Rhizobia-legume Symbiosismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Legume bioactive compounds: influence of rhizobial inoculation

et al. 2017

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“…Rhizobia form symbiotic associations with leguminous plants promoting their growth through the formation of root nodules, inside which they reduce dinitrogen providing ammonia to their hosts [4]. This interaction is mediated by signaling molecules and metabolic pathways [5], which help in sensing the micro-environmental conditions in the host, and also allow rhizobia to respond to stress conditions and benefit the host by playing a role in immunity [6].…”

Section: Introductionmentioning

confidence: 99%

Exo-Metabolites of Phaseolus vulgaris-Nodulating Rhizobial Strains

et al. 2019

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Rhizobia are able to convert dinitrogen into biologically available forms of nitrogen through their symbiotic association with leguminous plants. This results in plant growth promotion, and also in conferring host resistance to different types of stress. These bacteria can interact with other organisms and survive in a wide range of environments, such as soil, rhizosphere, and inside roots. As most of these processes are molecularly mediated, the aim of this research was to identify and quantify the exo-metabolites produced by Rhizobium etli CFN42, Rhizobium leucaenae CFN299, Rhizobium tropici CIAT899, Rhizobium phaseoli Ch24-10, and Sinorhizobium americanum CFNEI156, by nuclear magnetic resonance (NMR). Bacteria were grown in free-living cultures using minimal medium containing sucrose and glutamate. Interestingly, we found that even when these bacteria belong to the same family (Rhizobiaceae) and all form nitrogen-fixing nodules on Phaseolus vulgaris roots, they exhibited different patterns and concentrations of chemical species produced by them.

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