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Root nodule bacteria

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https://www.readbyqxmd.com/read/28639930/bradyrhizobium-mercantei-sp-nov-a-nitrogen-fixing-symbiont-isolated-from-nodules-of-deguelia-costata-syn-lonchocarpus-costatus
#1
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 22, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28629499/agrobacterium-salinitolerans-sp-nov-a-saline-alkaline-tolerant-bacterium-isolated-from-root-nodule-of-sesbania-cannabina
#2
Jun Yan, Yan Li, Hui Yan, Wen Feng Chen, Xiaoxia Zhang, En Tao Wang, Xiao Zeng Han, Zhi Hong Xie
Two Gram-staining-negative, aerobic bacteria (YIC 5082T and YIC4104) isolated from root nodules of Sesbania cannabina grown in a high-salt and alkaline environment were identified as a group in the genus Agrobacterium because they shared 100 and 99.7 % sequence similarities of 16S rRNA and recA+atpD genes, respectively. These two strains showed 99.2/100 % and 93.9/95.4 % 16S rRNA and recA+atpD gene sequence similarities to Agrobacterium radiobacter LMG140T and Agrobacterium. pusense NRCPB10T, respectively...
June 20, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28622658/how-effectors-promote-beneficial-interactions
#3
REVIEW
Hiroki Miwa, Shin Okazaki
Beneficial microbes such as rhizobia possess effector proteins that are secreted into the host cytoplasm where they modulate host-signaling pathways. Among these effectors, type 3 secreted effectors (T3Es) of rhizobia play roles in promoting nitrogen-fixing nodule symbiosis, suppressing host defenses and directly activating symbiosis-related processes. Rhizobia use the same strategy as pathogenic bacteria to suppress host defenses such as targeting the MAPK cascade. In addition, rhizobial T3E can promote root nodule symbiosis by directly activating Nod factor signaling, which bypasses Nod factor perception...
June 13, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28613079/rhizoremediation-of-residual-sulfonylurea-herbicides-in-agricultural-soils-using-lens-culinaris-and-a-commercial-supplement
#4
B Rainbird, R H Bentham, K L Soole
Sulfonylureas are a popular herbicide used today for controlling weeds. While beneficial for this purpose they present a persistent problem in agricultural treated areas proving detrimental for successive crops. This study assessed the phytoremediative properties of lentils (Lens culinaris) grown in uncontaminated and Chlorsulfuron-contaminated soil, with and without the addition of a growth supplement, PulseAider™. The results show that in the presence of lentils the degradation of Chlorsulfuron is enhanced and this degradation rate is significantly increased when the PulseAider™ supplement was included during seed sowing...
June 14, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28607058/host-secreted-antimicrobial-peptide-enforces-symbiotic-selectivity-in-medicago-truncatula
#5
Qi Wang, Shengming Yang, Jinge Liu, Kata Terecskei, Edit Ábrahám, Anikó Gombár, Ágota Domonkos, Attila Szűcs, Péter Körmöczi, Ting Wang, Lili Fodor, Linyong Mao, Zhangjun Fei, Éva Kondorosi, Péter Kaló, Attila Kereszt, Hongyan Zhu
Legumes engage in root nodule symbioses with nitrogen-fixing soil bacteria known as rhizobia. In nodule cells, bacteria are enclosed in membrane-bound vesicles called symbiosomes and differentiate into bacteroids that are capable of converting atmospheric nitrogen into ammonia. Bacteroid differentiation and prolonged intracellular survival are essential for development of functional nodules. However, in the Medicago truncatula-Sinorhizobium meliloti symbiosis, incompatibility between symbiotic partners frequently occurs, leading to the formation of infected nodules defective in nitrogen fixation (Fix(-))...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28607056/microsymbiont-discrimination-mediated-by-a-host-secreted-peptide-in-medicago-truncatula
#6
Shengming Yang, Qi Wang, Elena Fedorova, Jinge Liu, Qiulin Qin, Qiaolin Zheng, Paul A Price, Huairong Pan, Dong Wang, Joel S Griffitts, Ton Bisseling, Hongyan Zhu
The legume-rhizobial symbiosis results in the formation of root nodules that provide an ecological niche for nitrogen-fixing bacteria. However, plant-bacteria genotypic interactions can lead to wide variation in nitrogen fixation efficiency, and it is not uncommon that a bacterial strain forms functional (Fix(+)) nodules on one plant genotype but nonfunctional (Fix(-)) nodules on another. Host genetic control of this specificity is unknown. We herein report the cloning of the Medicago truncatula NFS1 gene that regulates the fixation-level incompatibility with the microsymbiont Sinorhizobium meliloti Rm41...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28528390/colonization-by-nitrogen-fixing-frankia-bacteria-causes-short-term-increases-in-herbivore-susceptibility-in-red-alder-alnus-rubra-seedlings
#7
Daniel J Ballhorn, Jacob D Elias, M A Balkan, Rachel F Fordyce, Peter G Kennedy
Carbon allocation demands from root-nodulating nitrogen-fixing bacteria (NFB) can modulate the host plant's chemical phenotype, with strong bottom-up effects on herbivores. In contrast to well-studied rhizobia, the effects of other important NFB on plant chemistry and herbivory are much less understood. Here, combining field surveys in the Oregon Coast Range, USA with laboratory experiments, we analyzed how N2-fixing Frankia bacteria influenced plant growth, chemistry, and herbivory on Alnus rubra (red alder) seedlings...
June 2017: Oecologia
https://www.readbyqxmd.com/read/28521260/exocytosis-for-endosymbiosis-membrane-trafficking-pathways-for-development-of-symbiotic-membrane-compartments
#8
REVIEW
Maria J Harrison, Sergey Ivanov
During endosymbiosis with arbuscular mycorrhizal fungi or rhizobial bacteria, the microbial symbionts are housed within membrane-bound compartments in root cortex or nodule cells respectively. Their development involves polarized deposition of membrane around the symbionts as they enter the cells and the membranes show functional specialization, including transporters that mediate nutrient transfer between host and symbiont. The cellular changes associated with development of these compartments point to membrane deposition via exocytosis and over the past few years, researchers have uncovered several proteins within the exocytotic pathway that are required for development of endosymbiotic membrane compartments...
May 15, 2017: Current Opinion in Plant Biology
https://www.readbyqxmd.com/read/28505340/members-of-microvirga-and-bradyrhizobium-genera-are-native-endosymbiotic-bacteria-nodulating-lupinus-luteus-in-northern-tunisian-soils
#9
Abdelhakim Msaddak, Mokhtar Rejili, David Durán, Luis Rey, Juan Imperial, Jose Manuel Palacios, Tomas Ruiz-Argüeso, Mohamed Mars
The genetic diversity of bacterial populations nodulating Lupinus luteus (yellow lupine) in Northern Tunisia was examined. Phylogenetic analyses of 43 isolates based on recA and gyrB partial sequences grouped them in three clusters, two of which belong to genus Bradyrhizobium (41 isolates) and one, remarkably, to Microvirga (2 isolates), a genus never previously described as microsymbiont of this lupine species. Representatives of the three clusters were analysed in-depth by multilocus sequence analysis of five housekeeping genes (rrs, recA, glnII, gyrB and dnaK)...
June 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28500544/diversity-and-plant-growth-promoting-properties-of-rhizobia-isolated-from-root-nodules-of-ononis-arvensis
#10
Sylwia Wdowiak-Wróbel, Monika Marek-Kozaczuk, Michał Kalita, Magdalena Karaś, Magdalena Wójcik, Wanda Małek
This is the first report describing isolates from root nodules of Ononis arvensis (field restharrow). The aim of this investigation was to describe the diversity, phylogeny, and plant growth promoting features of microsymbionts of O. arvensis, i.e., a legume plant growing in different places of the southern part of Poland. Twenty-nine bacterial isolates were characterized in terms of their phenotypic properties, genome fingerprinting, and comparative analysis of their 16S rRNA, nodC and acdS gene sequences...
May 12, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28499469/phylogenetically-diverse-groups-of-bradyrhizobium-isolated-from-nodules-of-tree-and-annual-legume-species-growing-in-ethiopia
#11
Tulu Degefu, Endalkachew Wolde-Meskel, Kedir Woliy, Åsa Frostegård
Bacteria belonging to the genus Bradyrhizobium nodulate various leguminous woody plants and herbs, including economically important crops such as soybean, peanut and cowpea. Here we analysed 39 Bradyrhizobium strains originating from root nodules of the leguminous trees and crops Acacia saligna, Faidherbia albida, Erythrina brucei, Albizia gummifera, Millettia ferruginea, Cajanus cajan, Vigna unguiculata and Phaseolus vulgaris, growing in southern Ethiopia. Multilocus sequence analyses (MLSA) of the 16S rRNA, glnII, recA, gyrB and dnaK genes and the ITS region grouped the test strains into seven well-supported genospecies (I-VII), six of which occupied distinct positions excluding all hitherto defined Bradyrhizobium species...
April 26, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28401641/a-conserved-%C3%AE-proteobacterial-small-rna-contributes-to-osmoadaptation-and-symbiotic-efficiency-of-rhizobia-on-legume-roots
#12
Marta Robledo, Alexandra Peregrina, Vicenta Millán, Natalia I García-Tomsig, Omar Torres-Quesada, Pedro F Mateos, Anke Becker, José I Jiménez-Zurdo
Small non-coding RNAs (sRNAs) are expected to have pivotal roles in the adaptive responses underlying symbiosis of nitrogen-fixing rhizobia with legumes. Here, we provide primary insights into the function and activity mechanism of the Sinorhizobium meliloti trans-sRNA NfeR1 (Nodule Formation Efficiency RNA). Northern blot probing and transcription tracking with fluorescent promoter-reporter fusions unveiled high nfeR1 expression in response to salt stress and throughout the symbiotic interaction. The strength and differential regulation of nfeR1 transcription are conferred by a motif, which is conserved in nfeR1 promoter regions in α-proteobacteria...
April 12, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28394446/laser-ablation-electrospray-ionization-mass-spectrometry-with-ion-mobility-separation-reveals-metabolites-in-the-symbiotic-interactions-of-soybean-roots-and-rhizobia
#13
Sylwia A Stopka, Beverly J Agtuca, David W Koppenaal, Ljiljana Paša-Tolić, Gary Stacey, Akos Vertes, Christopher R Anderton
Technologies enabling in situ metabolic profiling of living plant systems are invaluable for understanding physiological processes and could be used for rapid phenotypic screening (e.g., to produce plants with superior biological nitrogen-fixing ability). The symbiotic interaction between legumes and nitrogen-fixing soil bacteria results in a specialized plant organ (i.e., root nodule) where the exchange of nutrients between host and endosymbiont occurs. Laser-ablation electrospray ionization mass spectrometry (LAESI-MS) is a method that can be performed under ambient conditions requiring minimal sample preparation...
April 10, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28386665/agrobacterium-deltaense-sp-nov-an-endophytic-bacteria-isolated-from-nodule-of-sesbania-cannabina
#14
Jun Yan, Yan Li, Xiao Zeng Han, Wen Feng Chen, Wen Xiu Zou, Zhihong Xie, Meng Li
A Gram-negative, non-spore-forming, aerobic rods, strain YIC4121(T), was isolated from root nodule of Sesbania cannabina grown in Dongying (Yellow River Delta), Shandong Province, PR China. Based on phylogenetic analysis of 16 S rRNA gene sequences, strain YIC4121(T) was assigned to the genus Agrobacterium with 99.7, 99.3, 99.0, 98.8 and 98.7% sequence similarities to Agrobacterium radiobacter LMG140(T), A. pusense NRCPB10(T), A. arsenijevicii KFB 330(T), A. nepotum 39/7(T) and A. larrymoorei ATCC51759(T)...
April 6, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28376308/differential-colonization-by-bioprospected-rhizobial-bacteria-associated-to-common-bean-in-different-cropping-systems-i-i
#15
Josiele Polzin de Oliveira-Francesquini, Mariangela Hungria, Daiani Cristina Savi, Chirlei Glienke, Rodrigo Aluizio, Vanessa Kava, Lygia Vitória Galli-Terasawa
In this study, we evaluated the diversity of rhizobia isolated from root nodules on common bean (<i>Phaseolus vulgaris</i>) derived from Andean and Mesoamerican centers and grown under field and greenhouse conditions. Genetic characterization of isolates was performed by sequencing analyses of the 16S rRNA and two housekeeping genes, <i>rec</i>A and <i>gln</i>II, and by the amplification of <i>nif</i>H. Symbiotic efficiency was evaluated by examining nodulation, plant-biomass production and plant-N accumulation...
April 4, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28369229/legume-rhizobium-symbiotic-promiscuity-and-effectiveness-do-not-affect-plant-invasiveness
#16
Jan-Hendrik Keet, Allan G Ellis, Cang Hui, Johannes J Le Roux
Background and Aims: The ability to fix atmospheric nitrogen is thought to play an important role in the invasion success of legumes. Interactions between legumes and nitrogen-fixing bacteria (rhizobia) span a continuum of specialization, and promiscuous legumes are thought to have higher chances of forming effective symbioses in novel ranges. Using Australian Acacia species in South Africa, it was hypothesized that widespread and highly invasive species will be more generalist in their rhizobial symbiotic requirements and more effective in fixing atmospheric nitrogen compared with localized and less invasive species...
June 1, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28346361/specificity-in-legume-rhizobia-symbioses
#17
REVIEW
Mitchell Andrews, Morag E Andrews
Most species in the Leguminosae (legume family) can fix atmospheric nitrogen (N₂) via symbiotic bacteria (rhizobia) in root nodules. Here, the literature on legume-rhizobia symbioses in field soils was reviewed and genotypically characterised rhizobia related to the taxonomy of the legumes from which they were isolated. The Leguminosae was divided into three sub-families, the Caesalpinioideae, Mimosoideae and Papilionoideae. Bradyrhizobium spp. were the exclusive rhizobial symbionts of species in the Caesalpinioideae, but data are limited...
March 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28270909/high-quality-permanent-draft-genome-sequence-of-the-bradyrhizobium-elkanii-type-strain-usda-76-t-isolated-from-glycine-max-l-merr
#18
Wayne Reeve, Peter van Berkum, Julie Ardley, Rui Tian, Margaret Gollagher, Dora Marinova, Patrick Elia, T B K Reddy, Manoj Pillay, Neha Varghese, Rekha Seshadri, Natalia Ivanova, Tanja Woyke, Mohamed N Baeshen, Nabih A Baeshen, Nikos Kyrpides
Bradyrhizobium elkanii USDA 76(T) (INSCD = ARAG00000000), the type strain for Bradyrhizobium elkanii, is an aerobic, motile, Gram-negative, non-spore-forming rod that was isolated from an effective nitrogen-fixing root nodule of Glycine max (L. Merr) grown in the USA. Because of its significance as a microsymbiont of this economically important legume, B. elkanii USDA 76(T) was selected as part of the DOE Joint Genome Institute 2010 Genomic Encyclopedia for Bacteria and Archaea-Root Nodule Bacteria sequencing project...
2017: Standards in Genomic Sciences
https://www.readbyqxmd.com/read/28265280/interface-symbiotic-membrane-formation-in-root-nodules-of-medicago-truncatula-the-role-of-synaptotagmins-mtsyt1-mtsyt2-and-mtsyt3
#19
Aleksandr Gavrin, Olga Kulikova, Ton Bisseling, Elena E Fedorova
Symbiotic bacteria (rhizobia) are maintained and conditioned to fix atmospheric nitrogen in infected cells of legume root nodules. Rhizobia are confined to the asymmetrical protrusions of plasma membrane (PM): infection threads (IT), cell wall-free unwalled droplets and symbiosomes. These compartments rapidly increase in surface and volume due to the microsymbiont expansion, and remarkably, the membrane resources of the host cells are targeted to interface membrane quite precisely. We hypothesized that the change in the membrane tension around the expanding microsymbionts creates a vector for membrane traffic toward the symbiotic interface...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28255691/the-naringenin-induced-exoproteome-of-rhizobium-etli-ce3
#20
Niurka Meneses, Hermenegildo Taboada, Michael F Dunn, María Del Carmen Vargas, Natasha Buchs, Manfred Heller, Sergio Encarnación
Flavonoids excreted by legume roots induce the expression of symbiotically essential nodulation (nod) genes in rhizobia, as well as that of specific protein export systems. In the bean microsymbiont Rhizobium etli CE3, nod genes are induced by the flavonoid naringenin. In this study, we identified 693 proteins in the exoproteome of strain CE3 grown in minimal medium with or without naringenin, with 101 and 100 exoproteins being exclusive to these conditions, respectively. Four hundred ninety-two (71%) of the extracellular proteins were found in both cultures...
March 2, 2017: Archives of Microbiology
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