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https://www.readbyqxmd.com/read/28647822/devosia-nitraria-sp-nov-a-novel-species-isolated-from-the-roots-of-nitraria-sibirica-in-china
#1
Lin Xu, Yong Zhang, Nicholas Read, Shuangjiang Liu, Ville-Petri Friman
An aerobic, Gram-stain negative, short rod-shaped and motile strain, 36-5-1(T), was isolated from the roots of Nitraria sibirica in Zhangye city, Gansu province, north-west of China. Phylogenetic analysis based on the 16S rRNA gene sequence and two housekeeping genes (glnA and atpD) indicated that the strain represents a novel species closely related to the Devosia, Rhizobium and Devosia genera with 98.3, 96.2 and 91.1% similarities, respectively. The strain 36-5-1(T) contained Q-10 as the predominant ubiquinone and 16:0 (36...
June 24, 2017: Antonie Van Leeuwenhoek
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
#2
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/28641560/functional-and-catalytic-characterization-of-the-detoxifying-enzyme-haloalkane-dehalogenase-from-rhizobium-leguminosarum
#3
Nikolaos Georgakis, Evangelia Chronopoulou, Maria Anna Gad, Dimitrios Skliros, Rodica Efrose, Emmanouil Flemetakis, Nikolaos E Labrou
Haloalkanes are acutely toxic to animals and humans and their toxic effects are mainly observed in the liver, kidneys and central nervous system. In the present work, the haloalkane dehalogenase from Rhizobium leguminosarum bv. trifolii (DrlA) was characterized. Reverse transcription polymerase chain reaction analysis and enzyme activity assays revealed that the DrlA gene expression in R. leguminosarum bv. trifolii is induced by 1,2-dibromoethane (1,2-DBE) during the early exponential phase. The gene of the enzyme was isolated, cloned and expressed in E...
June 20, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28611764/interplay-of-pathogen-induced-defense-responses-and-symbiotic-establishment-in-medicago-truncatula
#4
Tao Chen, Liujian Duan, Bo Zhou, Haixiang Yu, Hui Zhu, Yangrong Cao, Zhongming Zhang
Suppression of host innate immunity appears to be required for the establishment of symbiosis between rhizobia and host plants. In this study, we established a system that included a host plant, a bacterial pathogen and a symbiotic rhizobium to study the role of innate immunity during symbiotic interactions. A pathogenic bacterium, Pseudomonas syringae pv. tomato strain DC3000 (Pst DC3000), was shown to cause chlorosis in Medicago truncatula A17. Sinorhizobium meliloti strain Sm2011 (Sm2011) and Pst DC3000 strain alone induced similar defense responses in M...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28608039/antifungal-genes-expressed-in-transgenic-pea-pisum-sativum-l-do-not-affect-root-colonization-of-arbuscular-mycorrhizae-fungi
#5
Jagroop Gill Kahlon, Hans-Jörg Jacobsen, James F Cahill, Linda M Hall
Genetically modified crops have raised concerns about unintended consequences on non-target organisms including beneficial soil associates. Pea transformed with four antifungal genes 1-3 β glucanase, endochitinase, polygalacturonase-inhibiting proteins, and stilbene synthase is currently under field-testing for efficacy against fungal diseases in Canada. Transgenes had lower expression in the roots than leaves in greenhouse experiment. To determine the impact of disease-tolerant pea or gene products on colonization by non-target arbuscular mycorrhizae and nodulation by rhizobium, a field trial was established...
June 12, 2017: Mycorrhiza
https://www.readbyqxmd.com/read/28598309/reclassification-of-arthrobacter-viscosus-as-rhizobium-viscosum-comb-nov
#6
José David Flores-Félix, Martha Helena Ramírez-Bahena, Sergio Salazar, Alvaro Peix, Encarna Velázquez
The species Arthrobacter viscosus was isolated from soil from Guatemala and it was classified into the genus Arthrobacter on the basis of phenotypic traits. Nevertheless, the results of16S rRNA gene analysis indicated that this species is a member of the genus Rhizobium, with Rhizobium alamii GBV016T and Rhizobium mesosinicum CCBAU 25010T as the most closely related species with 99.64 and 99.48 % similarity, respectively. The similarity values for the recA gene are 92.2 and 94.4 % with respect to R. alamii GBV016T and R...
June 9, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28598263/the-phenylalanine-ammonia-lyase-gene-ljpal1-is-involved-in-plant-defense-responses-to-pathogens-and-plays-diverse-roles-in-lotus-japonicus-rhizobium-symbioses
#7
Yaping Chen, Fengjiao Li, Lu Tian, Mingchao Huang, Rufang Deng, Xueliu Li, Wei Chen, Pingzhi Wu, Meiru Li, Huawu Jiang, Guojiang Wu
Phenylalanine ammonia-lyase (PAL) is important in the biosynthesis of plant secondary metabolites that regulate growth responses. Although its function is well established in various plants, the functional significance of PAL genes in nodulation is poorly understood. Here, we demonstrate that the Lotus japonicus PAL (LjPAL1) gene is induced by Mesorhizobium loti (M. loti) infection and MeJA treatment in roots. LjPAL1 altered PAL activity, leading to changes in lignin contents and thicknesses of cell walls in roots and nodules of transgenic plants, and hence to structural changes in roots and nodules...
June 9, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28574691/crystal-structure-of-a-bacterial-l-arabinonate-dehydratase-contains-2fe-2s-cluster
#8
Mohammad Mubinur Rahman, Martina Blomster Andberg, Senthil Kumar Thangaraj, Tarja Parkkinen, Merja Penttilä, Janne Jänis, Anu Koivula, Juha Rouvinen, Nina Hakulinen
We present a novel crystal structure of the IlvD/EDD family enzyme, L-arabinonate dehydratase from Rhizobium leguminosarum bv. trifolii (RlArDHT, EC 4.2.1.25), which catalyzes the conversion of L-arabinonate to 2-dehydro-3-deoxy-L-arabinonate. The enzyme is a tetramer consisting of a dimer of dimers, where each monomer is composed of two domains. The active site contains a catalytically important [2Fe-2S] cluster and Mg2+ ion, and is buried between two domains, and also at the dimer interface. The active site Lys129 was found to be carbamylated...
June 2, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28561275/screening-for-biosurfactant-production-by-2-4-6-trinitrotoluene-transforming-bacteria
#9
H Avila-Arias, H Avellaneda, V Garzón, G Rodríguez, Z Arbeli, E Garcia-Bonilla, S Villegas-Plazas, F Roldan
AIMS: Isolate and identify TNT-transforming cultures from explosive-contaminated soils with the ability to produce biosurfactants. METHODS AND RESULTS: Bacteria (pure and mixed cultures) were selected based on their ability to transform TNT in minimum media with TNT as the sole nitrogen source and an additional carbon source. TNT-transforming bacteria were identified by 16S rRNA gene sequencing. TNT transformation rates were significantly lower when no additional carbon or nitrogen source were added...
May 31, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28559882/bacterial-root-microbiome-of-plants-growing-in-oil-sands-reclamation-covers
#10
Eduardo K Mitter, J Renato de Freitas, James J Germida
Oil sands mining in northern Alberta impacts a large footprint, but the industry is committed to reclaim all disturbed land to an ecologically healthy state in response to environmental regulations. However, these newly reconstructed landscapes may be limited by several factors that include low soil nutrient levels and reduced microbial activity. Rhizosphere microorganisms colonize plant roots providing hosts with nutrients, stimulating growth, suppressing disease and increasing tolerance to abiotic stress...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28541039/label-free-discrimination-of-rhizobial-bacteroids-and-mutants-by-single-cell-raman-microspectroscopy
#11
Jiabao Xu, Isabel Webb, Philip Poole, Wei E Huang
Symbiotic rhizobia in legumes account for a large portion of nitrogen fixation in the biosphere. Nitrogen fixation is an energy-demanding process requiring tight control of metabolism and redox state. It is of great interest to understand the bacteroid differentiation process and the roles of energy storage molecules, such as glycogen and polyhydroxybutyrate (PHB), in maintaining the Rhizobium-legume symbioses. Traditional biochemical assays for checking phenotypic changes of mutants require a large volume of starting materials, which is difficult for unculturable, terminally differentiated bacteroids...
June 5, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28516418/improvement-of-the-stabilization-and-activity-of-protocatechuate-3-4-dioxygenase-isolated-from-rhizobium-sp-lmb-1-and-immobilized-on-fe3o4-nanoparticles
#12
Li-Shuang Zhang, Yue Fang, Ying Zhou, Bang-Ce Ye
Protocatechuate 3,4-dioxygenase (P34O), which is isolated from Rhizobium sp. LMB-1, catalyzes the ring cleavage step in the metabolism of aromatic compounds, and has great potential for environmental bioremediation. However, its structure is very sensitive to different environmental factors, which weaken its activity. Immobilization of the enzyme can improve its stability, allow reusability, and reduce operation costs. In this work, the relative molecular mass of the native P34O enzyme was determined to be 500 kDa by gel filtration chromatography on Sephadex G-200, and the enzyme was immobilized onto (3-aminopropyl) triethoxysilane-modified Fe3O4 nanoparticles (NPs) by the glutaraldehyde method...
May 17, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28500544/diversity-and-plant-growth-promoting-properties-of-rhizobia-isolated-from-root-nodules-of-ononis-arvensis
#13
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/28496149/the-active-site-structure-and-catalytic-mechanism-of-arsenite-oxidase
#14
Thomas P Warelow, M Jake Pushie, Julien J H Cotelesage, Joanne M Santini, Graham N George
Arsenite oxidase is thought to be an ancient enzyme, originating before the divergence of the Archaea and the Bacteria. We have investigated the nature of the molybdenum active site of the arsenite oxidase from the Alphaproteobacterium Rhizobium sp. str. NT-26 using a combination of X-ray absorption spectroscopy and computational chemistry. Our analysis indicates an oxidized Mo(VI) active site with a structure that is far from equilibrium. We propose that this is an entatic state imposed by the protein on the active site through relative orientation of the two molybdopterin cofactors, in a variant of the Rây-Dutt twist of classical coordination chemistry, which we call the pterin twist hypothesis...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28495892/lux-bacterial-biosensors-for-in-vivo-spatiotemporal-mapping-of-root-secretion
#15
Francesco Pini, Alison K East, Corinne Appia-Ayme, Jakub Tomek, Ramakrishnan Karunakaran, Marcela Mendoza-Suarez, Anne Edwards, Jason Terpolilli, Joshua Roworth, J Allan Downie, Philip S Poole
Plants engineer the rhizosphere to their advantage by secreting various nutrients and secondary metabolites. Coupling transcriptomic and metabolomic analysis of the Pisum sativum rhizosphere, a suite of bioreporters has been developed in Rhizobium leguminosarum bv. viciae 3841, and these detect metabolites secreted by roots in space and time. Fourteen bacterial lux-fusion bioreporters, specific for sugars, polyols, amino acids, organic acids or flavonoids, have been validated in vitro and in vivo. Using different bacterial mutants (nodC, nifH), the process of colonization and symbiosis has been analyzed, revealing compounds important in the different steps of the rhizobial-legume association...
May 11, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28489199/compatibility-of-azospirillum-brasilense-and-pseudomonas-fluorescens-in-growth-promotion-of-groundnut-arachis-hypogea-l
#16
Andhare A Prasad, Subramanian Babu
We attempted to study the compatibility among plant beneficial bacteria in the culture level by growing them near in the nutrient agar plates. Among all the bacteria tested, Rhizobium was found to inhibit the growth of other bacteria. From the compatible group of PGPR, we have selected one biofertilizer (Azospirillum brasilense strain TNAU) and one biocontrol agent (Pseudomonas fluorescens strain PF1) for further studies in the pot culture. We have also developed a bioformulation which is talc powder based, for individual bacteria and mixed culture...
May 2, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28488698/the-rhizobium-tropici-ciat-899-nodd2-protein-regulates-the-production-of-nod-factors-under-salt-stress-in-a-flavonoid-independent-manner
#17
Pablo Del Cerro, Francisco Pérez-Montaño, Antonio Gil-Serrano, Francisco Javier López-Baena, Manuel Megías, Mariangela Hungria, Francisco Javier Ollero
In the symbiotic associations between rhizobia and legumes, NodD promotes the expression of the nodulation genes in the presence of appropriate flavonoids. This set of genes is implied in the synthesis of Nodulation factors, which are responsible for launching the nodulation process. Rhizobium tropici CIAT 899 is the most successful symbiont of Phaseolus vulgaris and can nodulate a variety of legumes. This strain produces Nodulation factors under abiotic stress such as acidity or high concentration of salt...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28480491/double-genetically-modified-symbiotic-system-for-improved-cu-phytostabilization-in-legume-roots
#18
Patricia Pérez-Palacios, Asunción Romero-Aguilar, Julián Delgadillo, Bouchra Doukkali, Miguel A Caviedes, Ignacio D Rodríguez-Llorente, Eloísa Pajuelo
Excess copper (Cu) in soils has deleterious effects on plant growth and can pose a risk to human health. In the last decade, legume-rhizobium symbioses became attractive biotechnological tools for metal phytostabilization. For this technique being useful, metal-tolerant symbionts are required, which can be generated through genetic manipulation.In this work, a double symbiotic system was engineered for Cu phytostabilization: On the one hand, composite Medicago truncatula plants expressing the metallothionein gene mt4a from Arabidopsis thaliana in roots were obtained to improve plant Cu tolerance...
June 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28473386/permanent-draft-genome-sequence-of-rhizobium-sp-strain-lcm-4573-a-salt-tolerant-nitrogen-fixing-bacterium-isolated-from-senegalese-soils
#19
Nathalie Diagne, Erik Swanson, Céline Pesce, Fatoumata Fall, Fatou Diouf, Niokhor Bakhoum, Dioumacor Fall, Mathieu Ndigue Faye, Rediet Oshone, Stephen Simpson, Krystalynne Morris, W Kelley Thomas, Lionel Moulin, Diegane Diouf, Louis S Tisa
The genus Rhizobium contains many species that are able to form nitrogen-fixing nodules on plants of the legume family. Here, we report the 5.5-Mb draft genome sequence of the salt-tolerant Rhizobium sp. strain LCM 4573, which has a G+C content of 61.2% and 5,356 candidate protein-encoding genes.
May 4, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28469708/integrated-systems-for-biopolymers-and-bioenergy-production-from-organic-waste-and-by-products-a-review-of-microbial-processes
#20
REVIEW
Giorgia Pagliano, Valeria Ventorino, Antonio Panico, Olimpia Pepe
Recently, issues concerning the sustainable and harmless disposal of organic solid waste have generated interest in microbial biotechnologies aimed at converting waste materials into bioenergy and biomaterials, thus contributing to a reduction in economic dependence on fossil fuels. To valorize biomass, waste materials derived from agriculture, food processing factories, and municipal organic waste can be used to produce biopolymers, such as biohydrogen and biogas, through different microbial processes. In fact, different bacterial strains can synthesize biopolymers to convert waste materials into valuable intracellular (e...
2017: Biotechnology for Biofuels
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