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https://www.readbyqxmd.com/read/28437159/specific-host-responsive-associations-between-medicago-truncatula-accessions-and-sinorhizobium-strains
#1
Théophile Kazmierczak, Marianna Nagymihály, Florian Lamouche, Quentin Barrière, Ibtissem Guefrachi, Benoit Alunni, Mouna Ouadghiri, Jamal Ibijbijen, Éva Kondorosi, Peter Mergaert, Véronique Gruber
Legume plants interact with rhizobia to form nitrogen-fixing root nodules. Legume-rhizobium interactions are specific and only compatible rhizobia and plant species will lead to nodule formation. Even within compatible interactions, the genotype of both the plant and the bacterial symbiont will impact on the efficiency of nodule functioning and nitrogen-fixation activity. The model legume Medicago truncatula forms nodules with several species of the Sinorhizobium genus. However, the efficiency of these bacterial strains is highly variable...
April 24, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28421040/isolation-and-molecular-characterization-of-novel-chlorpyrifos-and-3-5-6-trichloro-2-pyridinol-degrading-bacteria-from-sugarcane-farm-soils
#2
Smriti Rayu, Uffe N Nielsen, Loïc Nazaries, Brajesh K Singh
Chlorpyrifos (CP) is one of the most widely used organophosphate pesticides in agriculture worldwide, but its extensive use has led to the contamination of various soil and water systems. Microbial bioremediation is considered to be one of the most viable options for the removal of CP from the environment; however, little is known about the soil bacterial diversity that degrade CP. Sequential soil and liquid culture enrichments enabled the isolation of bacterial CP degraders with sequence homologies to Xanthomonas sp...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28408686/permanent-draft-genome-sequence-of-the-french-bean-symbiont-rhizobium-sp-strain-rsm-3-isolated-from-the-eastern-himalayan-region-of-india
#3
Ritu Rai, Erik Swanson, Indrani Sarkar, Dorjay Lama, Feseha Abebe-Aleke, Stephen Simpson, Krystalynne Morris, W Kelley Thomas, Pallab Kar, Maher Gtari, Arnab Sen, Louis S Tisa
The genus Rhizobium contains many species able to form nitrogen-fixing nodules on plants of the legume family. Here, we report the 6.9-Mbp draft genome sequence of Rhizobium sp. strain RSm-3, with a G+C content of 61.4% and 6,511 candidate protein-coding genes.
April 13, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28405399/strain-identification-and-quorum-sensing-inhibition-characterization-of-marine-derived-rhizobium-sp-nao1
#4
Hong Chang, Jin Zhou, Xiaoshan Zhu, Shenchen Yu, Lu Chen, Hui Jin, Zhonghua Cai
A novel strategy for combating pathogens is through the ongoing development and use of anti-quorum sensing (QS) treatments such as therapeutic bacteria or their anti-QS substances. Relatively little is known about the bacteria that inhabit the open ocean and of their potential anti-pathogenic attributes; thus, in an initiative to identify these types of therapeutic bacteria, planktonic microbes from the North Atlantic Ocean were collected, isolated, cultured and screened for anti-QS activity. Screening analysis identified one such strain, Rhizobium sp...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28398123/heterologous-complementation-reveals-a-specialized-activity-for-baca-in-the-medicago-sinorhizobium-meliloti-symbiosis
#5
George C diCenzo, Maryam Zamani, Hannah N Ludwig, Turlough M Finan
The bacterium Sinorhizobium meliloti Rm2011 forms N2-fixing root nodules on alfalfa and other leguminous plants. The pSymB chromid contains a 110-kb region (the ETR region) showing high synteny to a chromosomally located region in Sinorhizobium fredii NGR234 and related rhizobia. We recently introduced the ETR region from S. fredii NGR234 into the S. meliloti chromosome. Here, we report that, unexpectedly, the S. fredii NGR234 ETR region did not complement deletion of the S. meliloti ETR region in symbiosis with Medicago sativa...
April 10, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28386666/electrophoretic-profiles-of-lipopolysaccharides-from-rhizobium-strains-nodulating-pisum-sativum-do-not-reflect-phylogenetic-relationships-between-these-strains
#6
Jolanta Kutkowska, Monika Marek-Kozaczuk, Jerzy Wielbo, Marek Wójcik, Teresa Urbanik-Sypniewska
Rhizobia that nodulate peas comprise a heterogeneous group of bacteria. The aim of this study was to investigate the relationship between phylogeny and electrophoretic and hydroxy fatty acid lipopolysaccharide (LPS) profiles of pea microsymbionts. Based on amplified fragment length polymorphism (AFLP) fingerprinting data, the pea microsymbionts were grouped into two clusters distinguished at 58% similarity level. Based on the concatenated 16S rRNA, recA, and atpD housekeeping gene data, the microsymbionts appeared to be most closely related to Rhizobium leguminosarum biovars viciae and trifolii...
April 6, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28382474/selection-and-characterization-of-coal-mine-autochthonous-rhizobia-for-the-inoculation-of-herbaceous-legumes
#7
Anabel González Hernández, Ginaini Doin de Moura, Renato Leal Binati, Francisco Xavier Inês Nascimento, Diana Morales Londoño, Ana Carolina Peixoto Mamede, Emanuela Pille da Silva, Rafael Dutra de Armas, Admir José Giachini, Márcio José Rossi, Cláudio Roberto Fonsêca Sousa Soares
Coal open pit mining in the South of Santa Catarina state (Brazil) was inappropriately developed, affecting approximately 6.700 ha. Re-vegetation is an alternative for the recovery of these areas. Furthermore, the use of herbaceous legumes inoculated with nitrogen fixing bacteria is motivated due to the difficulty implementing a vegetation cover in these areas, mainly due to low nutrient availability. Therefore, the aim of this work was to evaluate, among 16 autochthonous rhizobia isolated from the coal mining areas, those with the greatest potential to increase growth of the herbaceous legumes Vicia sativa and Calopogonium mucunoides...
April 5, 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
#8
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/28375633/magnesium-fertilizer-induced-increase-of-symbiotic-microorganisms-improves-forage-growth-and-quality
#9
Jihui Chen, Yanpeng Li, Shilin Wen, Andrea Rosanoff, Gaowen Yang, Xiao Sun
Magnesium (Mg) plays important roles in photosynthesis and protein synthesis; however, latent Mg deficiencies are common phenomena that can influence food quality. Nevertheless, the effects of Mg fertilizer additions on plant carbon (C):nitrogen (N):phosphorus (P) stoichiometry, an important index of food quality, are unclear and the underlying mechanisms unexplored. We conducted a greenhouse experiment using low-Mg in situ soil without and with a gradient of Mg additions to investigate the effect of Mg fertilizer on growth and stoichiometry of maize and soybean and also measure these plants' main symbiotic microorganisms: arbuscular mycorrhizal fungi (AMF) and rhizobium, respectively...
April 12, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28372899/phylogenetically-diverse-group-of-native-bacterial-symbionts-isolated-from-root-nodules-of-groundnut-arachis-hypogaea-l-in-south-africa
#10
Sanjay K Jaiswal, Levini A Msimbira, Felix D Dakora
Groundnut is an economically important N​2-fixing legume that can contribute about 100-190kgNha(-1) to cropping systems. In this study, groundnut-nodulating native rhizobia in South African soils were isolated from root nodules. Genetic analysis of isolates was done using restriction fragment length polymorphism (RFLP)-PCR of the intergenic spacer (IGS) region of 16S-23S rDNA. A total of 26 IGS types were detected with band sizes ranging from 471 to 1415bp. The rhizobial isolates were grouped into five main clusters with Jaccard's similarity coefficient of 0...
March 7, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28369229/legume-rhizobium-symbiotic-promiscuity-and-effectiveness-do-not-affect-plant-invasiveness
#11
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...
March 28, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28348373/the-role-of-rhizobial-nifv-and-plant-fen1-homocitrate-synthases-in-aeschynomene-photosynthetic-bradyrhizobium-symbiosis
#12
Nico Nouwen, Jean-François Arrighi, Fabienne Cartieaux, Clémence Chaintreuil, Djamel Gully, Christophe Klopp, Eric Giraud
In the most studied rhizobium-legume interactions, the host plant supplies the symbiont with homocitrate, an essential co-factor of the nitrogenase enzyme complex, via the expression of a nodule-specific homocitrate synthase FEN1. Photosynthetic bradyrhizobia interacting with Nod factor (NF) dependent and NF-independent Aeschynomene legumes are able to synthesize homocitrate themselves as they contain a nifV gene encoding a homocitrate synthase. Here, we show that in the model strain ORS285, nifV is required for free-living and symbiotic dinitrogen fixation with NF-independent Aeschynomene species...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28346361/specificity-in-legume-rhizobia-symbioses
#13
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/28338684/seven-enzymes-create-extraordinary-molecular-complexity-in-an-uncultivated-bacterium
#14
Michael F Freeman, Maximilian J Helf, Agneya Bhushan, Brandon I Morinaka, Jörn Piel
Uncultivated bacteria represent a massive resource of new enzymes and bioactive metabolites, but such bacteria remain functionally enigmatic. Polytheonamides are potent peptide cytotoxins produced by uncultivated bacteria that exist as symbionts in a marine sponge. Outside glycobiology, polytheonamides represent the most heavily post-translationally modified biomolecules that are derived from amino acids. The biosynthesis of polytheonamides involves up to 50 site-specific modifications to create a membrane-spanning β-helical structure...
April 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28333211/glutathione-affects-the-transport-activity-of-rhizobium-leguminosarum-3841-and-is-essential-for-efficient-nodulation
#15
Guojun Cheng, Ramakrishnan Karunakaran, Alison K East, Olaya Munoz-Azcarate, Philip S Poole
As glutathione (GSH) plays an essential role in growth and symbiotic capacity of rhizobia, a glutathione synthetase (gshB) mutant of Rhizobium leguminosarum biovar viciae 3841 (Rlv3841) was characterised. It fails to efficiently utilise various compounds as a sole carbon source, including glucose, succinate, glutamine and histidine, and shows 60-69% reduction in uptake rates of glucose, succinate and the non-metabolisable substrate α-amino isobutyric acid (AIB). The defect in glucose uptake can be overcome by addition of exogenous GSH, indicating GSH, but not its bacterial synthesis, is required for efficient transport...
February 23, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28330071/unexpected-formation-of-n-phenyl-thiophosphorohydrazidic-acid-o-s-dimethyl-ester-from-acephate-chemical-biotechnical-and-computational-study
#16
Vijay Kumar, Sukhmanpreet Kaur, Simranjeet Singh, Niraj Upadhyay
By the nucleophilic attack of phenylhydrazine on acephate in aqueous medium, a stable product N'-phenyl-thiophosphorohydrazidic acid O,S-dimethyl ester (1) was obtained and characterized by elemental, spectral and thermal analysis. Thermodynamic parameters, Ea, ΔH°, ΔS° and ΔG°, have found to be 62.15, -67.95, -0.068 and -20.05 kJ mol(-1) according to the Coats-Redfern equation. Analysis of interaction of 1 with BSA protein was done by using the UV-Vis and FTIR spectroscopic methods. The observed binding constants was 1...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28326071/temporal-variations-in-cigarette-tobacco-bacterial-community-composition-and-tobacco-specific-nitrosamine-content-are-influenced-by-brand-and-storage-conditions
#17
Jessica Chopyk, Suhana Chattopadhyay, Prachi Kulkarni, Eoghan M Smyth, Lauren E Hittle, Joseph N Paulson, Mihai Pop, Stephanie S Buehler, Pamela I Clark, Emmanuel F Mongodin, Amy R Sapkota
Tobacco products, specifically cigarettes, are home to microbial ecosystems that may play an important role in the generation of carcinogenic tobacco-specific nitrosamines (TSNAs), as well as the onset of multiple adverse human health effects associated with the use of these products. Therefore, we conducted time-series experiments with five commercially available brands of cigarettes that were either commercially mentholated, custom-mentholated, user-mentholated, or non-mentholated. To mimic user storage conditions, the cigarettes were incubated for 14 days under three different temperatures and relative humidities (i...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28324236/efficient-de-novo-synthesis-of-resveratrol-by-metabolically-engineered-escherichia-coli
#18
Junjun Wu, Peng Zhou, Xia Zhang, Mingsheng Dong
Resveratrol has been the subject of numerous scientific investigations due to its health-promoting activities against a variety of diseases. However, developing feasible and efficient microbial processes remains challenging owing to the requirement of supplementing expensive phenylpropanoic precursors. Here, various metabolic engineering strategies were developed for efficient de novo biosynthesis of resveratrol. A recombinant malonate assimilation pathway from Rhizobium trifolii was introduced to increase the supply of the key precursor malonyl-CoA and simultaneously, the clustered regularly interspaced short palindromic repeats interference system was explored to down-regulate fatty acid biosynthesis pathway to inactivate the malonyl-CoA consumption pathway...
March 21, 2017: Journal of Industrial Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28323446/leguminosae-native-nodulating-bacteria-from-a-gold-mine-as-contaminated-soil-multi-resistance-to-trace-elements-and-possible-role-in-plant-growth-and-mineral-nutrition
#19
Wesley de M Rangel, Silvia M de Oliveira Longatti, Paulo A A Ferreira, Daiane S Bonaldi, Amanda A Guimarães, Sofie Thijs, Nele Weyens, Jaco Vangronsveld, Fatima M S Moreira
Efficient N2-fixing Leguminosae nodulating bacteria resistant to As may facilitate plant growth on As-contaminated sites. In order to identify bacteria possessing these features, 24 strains were isolated from nodules of the trap species Crotalaria spectabilis (12) and Stizolobium aterrimum (12) growing on an As-contaminated gold mine site. 16S rRNA gene sequencing revealed that most of the strains belonged to the group of α-Proteobacteria, being representatives of the genera Bradyrhizobium, Rhizobium, Inquilinus, Labrys, Bosea, Starkeya and Methylobacterium...
March 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28302777/complete-genome-sequences-of-three-rhizobium-gallicum-symbionts-associated-with-common-bean-phaseolus-vulgaris
#20
Patricia Bustos, Rosa Isela Santamaría, Olga María Pérez-Carrascal, José Luis Acosta, Luis Lozano, Soledad Juárez, Irma Martínez-Flores, Esperanza Martínez-Romero, Miguel Ángel Cevallos, David Romero, Guillermo Dávila, Pablo Vinuesa, Fabiola Miranda, Ernesto Ormeño, Víctor González
The whole-genome sequences of three strains of Rhizobium gallicum reported here support the concept that the distinct nodulation host ranges displayed by the symbiovars gallicum and phaseoli can be largely explained by different symbiotic plasmids.
March 16, 2017: Genome Announcements
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