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Root nodule bacteria

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https://www.readbyqxmd.com/read/28931627/the-nitrate-transporter-family-protein-npf8-6-controls-the-n-fixing-nodule-activity
#1
Vladimir Totev Valkov, Ludovico Martins Alves, Stefano Sol, Mélanie Noguero, Sophie Léran, Benoit Lacombe, Maurizio Chiurazzi
N-fixing nodules are new organs formed on legume roots as result of the beneficial interaction with soil bacteria, rhizobia. The nodule functioning is still a poorly characterized step of the symbiotic interaction as only few of the genes induced in N-fixing nodules have been functionally characterized. We present here the characterization of the member of the Lotus japonicus nitrate transporter 1/peptide transporter family LjNPF8.6. The phenotypic characterization carried out in independent L. japonicus LORE1 insertion lines indicates a positive role of LjNPF8...
September 20, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28916558/potential-of-rice-stubble-as-a-reservoir-of-bradyrhizobial-inoculum-in-rice-legume-crop-rotation
#2
Pongdet Piromyou, Teerana Greetatorn, Kamonluck Teamtisong, Panlada Tittabutr, Nantakorn Boonkerd, Neung Teaumroong
Bradyrhizobium encompasses a variety of bacteria that can live in symbiotic and endophytic associations with leguminous and non-leguminous plants such as rice. Therefore, it can be expected that rice endophytic bradyrhizobia can be applied in the rice-legume crop rotation system. Some endophytic bradyrhizobial strains were isolated from rice (Oryza sativa L.) tissues. The rice biomass could be enhanced when supplying KNO3, NH4NO3, or urea with bradyrhizobial strain inoculation, especially strain SUTN9-2. In contrast, the strains which suppressed rice growth were photosynthetic bradyrhizobia and also found to produce nitric oxide (NO) in the rice root...
September 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28902963/rhizospheric-fungi-and-their-link-with-the-nitrogen-fixing-frankia-harbored-in-host-plant-hippophae-rhamnoides-l
#3
Xue Zhou, Lei Tian, Jianfeng Zhang, Lina Ma, Xiujun Li, Chunjie Tian
Sea buckthorn (Hippophae rhamnoides L.) is a pioneer plant used for land reclamation and an appropriate material for studying the interactions of symbiotic microorganisms because of its nitrogen-fixing root nodules and mycorrhiza. We used high-throughput sequencing to reveal the diversities and community structures of rhizospheric fungi and their link with nitrogen-fixing Frankia harbored in sea buckthorn collected along an altitude gradient from the Qinghai Tibet Plateau to interior areas. We found that the fungal diversities and compositions varied between different sites...
September 13, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28887555/monitoring-the-colonization-and-infection-of-legume-nodules-by-micromonospora-in-co-inoculation-experiments-with-rhizobia
#4
Patricia Benito, Pablo Alonso-Vega, Carolina Aguado, Rafael Luján, Yojiro Anzai, Ann M Hirsch, Martha E Trujillo
The discovery that the actinobacterium Micromonospora inhabits nitrogen-fixing nodules raised questions as to its potential ecological role. The capacity of two Micromonospora strains to infect legumes other than their original host, Lupinus angustifolius, was investigated using Medicago and Trifolium as test plants. Compatible rhizobial strains were used for coinoculation of the plants because Micromonospora itself does not induce nodulation. Over 50% of nodules from each legume housed Micromonospora, and using 16S rRNA gene sequence identification, we verified that the reisolated strains corresponded to the microorganisms inoculated...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28884663/proposal-of-candidatus-frankia-californiensis-the-uncultured-symbiont-in-nitrogen-fixing-root-nodules-of-a-phylogenetically-broad-group-of-hosts-endemic-to-western-north-america
#5
Philippe Normand, Thanh Van Nguyen, Kai Battenberg, Alison M Berry, Brian Vanden Heuvel, Maria P Fernandez, Katharina Pawlowski
The genus Frankia comprises a group of nitrogen-fixing actinobacteria that form root-nodule symbioses with perennial dicotyledonous plants in the nitrogen-fixing clade. These bacteria have been characterized phylogenetically and grouped into four clusters (clusters 1-4). Cluster 2 contains mostly uncultured strains that induce nodules on species of the genera Datisca (Datiscaceae), Coriaria (Coriariaceae), Ceanothus (Rhamnaceae) and several genera in the family Rosaceae (Cercocarpus, Chamaebatia, Dryas, Purshia), all of which except members of the genus Coriaria are present within the California Floristic Province (CFP) or neighbouring areas of western North America...
September 8, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28869059/soybeans-inoculated-with-root-zone-soils-of-canadian-native-legumes-harbour-diverse-and-novel-bradyrhizobium-spp-that-possess-agricultural-potential
#6
Eden S P Bromfield, Sylvie Cloutier, James T Tambong, Thu Van Tran Thi
An assessment was made of the evolutionary relationships of soybean nodulating bacteria associated with legumes native to eastern Canada to identify potential new sources of soybean inoculant strains. Short season soybeans were used to selectively trap bacteria from root zone soils of four native legume species. Screening of more than 800 bacterial isolates from soybean root nodules by analysis of recA gene sequences followed by analyses of selected genotypes using six core and two symbiosis (nodC and nifH) gene sequences permitted identification of diverse taxa that included eight novel and four named Bradyrhizobium species as well as lineages attributed to the genera Afipia and Tardiphaga...
August 18, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28867628/molecular-and-phenotypic-characterization-of-endophytic-bacteria-isolated-from-sulla-nodules
#7
Hamida Beghalem, Khadidja Aliliche, Ali Chriki, Ahmed Landoulsi
In the current study, bacterial diversity was investigated in root nodules of Sulla pallida and Sulla capitata. The isolates were analyzed on the basis of their phenotypic and molecular characteristics. The phylogenetic analysis based on 16S rRNA and housekeeping genes (recA and atpD) showed that the isolated bacteria related to Sinorhizobium, Neorhizobium, Phyllobacterium, Arthrobacter, Variovorax and Pseudomonas genera. This is the first report of Neorhizobium genus associated with Hedysarum genus. Phenotypically, all strains tolerate the elevated temperature of 40 °C, and salt stress at a concentration of 2%...
September 1, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28831061/integrated-roles-of-bcla-and-dd-carboxypeptidase-1-in-bradyrhizobium-differentiation-within-ncr-producing-and-ncr-lacking-root-nodules
#8
Quentin Barrière, Ibtissem Guefrachi, Djamel Gully, Florian Lamouche, Olivier Pierre, Joël Fardoux, Clémence Chaintreuil, Benoît Alunni, Tatiana Timchenko, Eric Giraud, Peter Mergaert
Legumes harbor in their symbiotic nodule organs nitrogen fixing rhizobium bacteria called bacteroids. Some legumes produce Nodule-specific Cysteine-Rich (NCR) peptides in the nodule cells to control the intracellular bacterial population. NCR peptides have antimicrobial activity and drive bacteroids toward terminal differentiation. Other legumes do not produce NCR peptides and their bacteroids are not differentiated. Bradyrhizobia, infecting NCR-producing Aeschynomene plants, require the peptide uptake transporter BclA to cope with the NCR peptides as well as a specific peptidoglycan-modifying DD-carboxypeptidase, DD-CPase1...
August 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28768212/effects-of-biosolids-from-a-wastewater-treatment-plant-receiving-manufactured-nanomaterials-on-medicago-truncatula-and-associated-soil-microbial-communities-at-low-nanomaterial-concentrations
#9
Chun Chen, Olga V Tsyusko, Dave H McNear, Jonathan Judy, Ricky W Lewis, Jason M Unrine
Concern has grown regarding engineered nanomaterials (ENMs) entering agricultural soils through the application of biosolids and their possible effects on agroecosystems, even though the ENMs are extensively transformed. The effects of exposure to biosolids containing transformation products of these ENMs at low concentrations remain largely unexplored. We examined the responses of Medicago truncatula and its symbiotic rhizobia Sinorhizobium meliloti exposed to soil amended with biosolids from WWTP containing low added concentrations of ENMs (ENM Low), bulk/dissolved metals (bulk/dissolved Low), or no metal additions (control)...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28756029/tripartite-symbiosis-of-sophora-tomentosa-rhizobia-and-arbuscular-mycorhizal-fungi
#10
Maíra Akemi Toma, Teotonio Soares de Carvalho, Amanda Azarias Guimarães, Elaine Martins da Costa, Jacqueline Savana da Silva, Fatima Maria de Souza Moreira
Sophora tomentosa is a pantropical legume species with potential for recovery of areas degraded by salinization, and for stabilization of sand dunes. However, few studies on this species have been carried out, and none regarding its symbiotic relationship with beneficial soil microorganisms. Therefore, this study aimed to evaluate the diversity of nitrogen-fixing bacteria isolated from nodules of Sophora tomentosa, and to analyze the occurrence of colonization of arbuscular mycorrhizal fungi on the roots of this legume in seafront soil...
June 29, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28755910/reprint-of-fast-and-sensitive-in-vivo-studies-under-controlled-environmental-conditions-to-substitute-long-term-field-trials-with-genetically-modified-plants
#11
Patricia Horn, André Schlichting, Christel Baum, Ute Hammesfahr, Sören Thiele-Bruhn, Peter Leinweber, Inge Broer
We introduce an easy, fast and effective method to analyze the influence of genetically modified (GM) plants on soil and model organisms in the laboratory to substitute laborious and time consuming field trials. For the studies described here we focused on two GM plants of the so-called 3rd generation: GM plants producing pharmaceuticals (PMP) and plant made industrials (PMI). Cyanophycin synthetase (cphA) was chosen as model for PMI and Choleratoxin B (CTB) as model for PMP. The model genes are expressed in transgenic roots of composite Vicia hirsuta plants grown in petri dishes for semi-sterile growth or small containers filled with non-sterile soil...
July 26, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28751316/determining-the-site-of-action-of-strigolactones-during-nodulation
#12
Erin L McAdam, Cassandra Hugill, Sebastien Fort, Eric Samain, Sylvain Cottaz, Noel W Davies, James B Reid, Eloise Foo
Strigolactones (SLs) influence the ability of legumes to associate with nitrogen-fixing bacteria. In this study, we determine the precise stage at which SLs influence nodulation. We show that SLs promote infection thread formation, as a null SL-deficient pea (Pisum sativum) mutant forms significantly fewer infection threads than wild-type plants, and this reduction can be overcome by the application of the synthetic SL GR24. We found no evidence that SLs influence physical events in the plant before or after infection thread formation, since SL-deficient plants displayed a similar ability to induce root hair curling in response to rhizobia or Nod lipochitooligosaccharides (LCOs) and SL-deficient nodules appear to fix nitrogen at a similar rate to those of wild-type plants...
September 2017: Plant Physiology
https://www.readbyqxmd.com/read/28739135/cytokinins-in-symbiotic-nodulation-when-where-what-for
#13
REVIEW
Pascal Gamas, Mathias Brault, Marie-Françoise Jardinaud, Florian Frugier
Substantial progress has been made in the understanding of early stages of the symbiotic interaction between legume plants and rhizobium bacteria. Those include the specific recognition of symbiotic partners, the initiation of bacterial infection in root hair cells, and the inception of a specific organ in the root cortex, the nodule. Increasingly complex regulatory networks have been uncovered in which cytokinin (CK) phytohormones play essential roles in different aspects of early symbiotic stages. Intriguingly, these roles can be either positive or negative, cell autonomous or non-cell autonomous, and vary, depending on time, root tissues, and possibly legume species...
September 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28711576/explaining-coexistence-of-nitrogen-fixing-and-non-fixing-rhizobia-in-legume-rhizobia-mutualism-using-mathematical-modeling
#14
G Moyano, D Marco, D Knopoff, G Torres, C Turner
In the mutualism established between legumes and soil bacteria known as rhizobia, bacteria from soil infect plants roots and reproduce inside root nodules where they fix atmospheric N2 for plant nutrition, receiving carbohydrates in exchange. Host-plant sanctions against non N2 fixing, cheating bacterial symbionts have been proposed to act in the legume-Rhizobium symbiosis, to preserve the mutualistic relationship. Sanctions include decreased rhizobial survival in nodules occupied by cheating rhizobia. Previously, a simple population model experimentally based showed that the coexistence of fixing and cheating rhizobia strains commonly found in field conditions is possible, and that the inclusion of sanctions leads to the extinction of cheating strains in soil...
July 12, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/28700717/integrated-analysis-of-zone-specific-protein-and-metabolite-profiles-within-nitrogen-fixing-medicago-truncatula-sinorhizobium-medicae-nodules
#15
Aaron J Ogden, Mahmoud Gargouri, JeongJin Park, David R Gang, Michael L Kahn
Symbiotic nitrogen fixation (SNF) between rhizobia and legumes requires metabolic coordination within specialized root organs called nodules. Nodules formed in the symbiosis between S. medicae and barrel medic (M. truncatula) are indeterminate, cylindrical, and contain spatially distinct developmental zones. Bacteria in the infection zone II (ZII), interzone II-III (IZ), and nitrogen fixation zone III (ZIII) represent different stages in the metabolic progression from free-living bacteria into nitrogen fixing bacteroids...
2017: PloS One
https://www.readbyqxmd.com/read/28672885/characterization-of-sinorhizobium-sp-lm21-prophages-and-virus-encoded-dna-methyltransferases-in-the-light-of-comparative-genomic-analyses-of-the-sinorhizobial-virome
#16
Przemyslaw Decewicz, Monika Radlinska, Lukasz Dziewit
The genus Sinorhizobium/Ensifer mostly groups nitrogen-fixing bacteria that create root or stem nodules on leguminous plants and transform atmospheric nitrogen into ammonia, which improves the productivity of the plants. Although these biotechnologically-important bacteria are commonly found in various soil environments, little is known about their phages. In this study, the genome of Sinorhizobium sp. LM21 isolated from a heavy-metal-contaminated copper mine in Poland was investigated for the presence of prophages and DNA methyltransferase-encoding genes...
June 26, 2017: Viruses
https://www.readbyqxmd.com/read/28654662/generation-of-a-rabbit-single-chain-fragment-variable-scfv-antibody-for-specific-detection-of-bradyrhizobium-sp-doa9-in-both-free-living-and-bacteroid-forms
#17
Nguyen Xuan Vu, Natcha Pruksametanan, Witsanu Srila, Watcharin Yuttavanichakul, Kamonluck Teamtisong, Neung Teaumroong, Nantakorn Boonkerd, Panlada Tittabutr, Montarop Yamabhai
A simple and reliable method for the detection of specific nitrogen-fixing bacteria in both free-living and bacteroid forms is essential for the development and application of biofertilizer. Traditionally, a polyclonal antibody generated from an immunized rabbit was used for detection. However, the disadvantages of using a polyclonal antibody include limited supply and cross-reactivity to related bacterial strains. This is the first report on the application of phage display technology for the generation of a rabbit recombinant monoclonal antibody for specific detection and monitoring of nitrogen-fixing bacteria in both free-living form and in plant nodules...
2017: PloS One
https://www.readbyqxmd.com/read/28649348/no-evidence-for-adaptation-to-local-rhizobial-mutualists-in-the-legume-medicago-lupulina
#18
Tia L Harrison, Corlett W Wood, Isabela L Borges, John R Stinchcombe
Local adaptation is a common but not ubiquitous feature of species interactions, and understanding the circumstances under which it evolves illuminates the factors that influence adaptive population divergence. Antagonistic species interactions dominate the local adaptation literature relative to mutualistic ones, preventing an overall assessment of adaptation within interspecific interactions. Here, we tested whether the legume Medicago lupulina is adapted to the locally abundant species of mutualistic nitrogen-fixing rhizobial bacteria that vary in frequency across its eastern North American range...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28647122/effect-of-succinate-on-phosphate-solubilization-in-nitrogen-fixing-bacteria-harbouring-chick-pea-and-their-effect-on-plant-growth
#19
Bhagya Iyer, Mahendrapal Singh Rajput, Shalini Rajkumar
Diverse nitrogen fixing bacteria harbouring chick pea rhizosphere and root nodules were tested for multiple plant growth promoting traits like tricalcium phosphate (TCP) and rock phosphate (RP) solubilization, production of ammonia, indole 3-acetic acid, chitinase, phytase and alkaline phosphatase. Isolates belonged to diverse genus like Enterobacter, Acinetobacter, Erwinia, Pseudomonas, Rhizobium, Sinorhizobium, Ensifer, Klebsiella, etc. Most isolates solubilized TCP and RP along with the lowering of media pH, indicating acidification to be the chief mechanism behind this solubilization...
September 2017: Microbiological Research
https://www.readbyqxmd.com/read/28639930/bradyrhizobium-mercantei-sp-nov-a-nitrogen-fixing-symbiont-isolated-from-nodules-of-deguelia-costata-syn-lonchocarpus-costatus
#20
Luisa Caroline Ferraz Helene, Jakeline Renata Marçon Delamuta, Renan Augusto Ribeiro, Mariangela Hungria
Some bacteria collectively known as rhizobia can establish symbiotic relationships and the N2-fixation process with several legumes used as green manure, in pastures and for wood production. Symbionts belonging to the genus Bradyrhizobium are predominant in the tropics, and an increasing number of studies report high genetic diversity within the genus. We performed a polyphasic study with two strains belonging to the genus Bradyrhizobium- SEMIA 6399T and SEMIA 6404-isolated from root nodules of Deguelia costata (syn...
June 2017: International Journal of Systematic and Evolutionary Microbiology
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