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https://www.readbyqxmd.com/read/28738552/nutrients-removal-and-bacterial-community-structure-for-low-c-n-municipal-wastewater-using-a-modified-anaerobic-anoxic-oxic-ma2-o-process-in-north-china
#1
Shihua Zhang, Zhijia Huang, Shujian Lu, Jun Zheng, Xinxi Zhang
A modified anaerobic/anoxic/oxic (mA2/O) process based on utilizing the internal carbon source and adding polypropylene carriers was operated for 90d to investigate the nutrients removal performance and bacterial community. This system exhibited a stable and efficient performance, particularly, in removing the NH4(+)-N and total phosphorus. The results of high-throughput sequencing showed that the 13 dominant genera containing Pseudomonas, Comamonas, Arcobacter, Nitrobacteria, Nitrosospira, Nitrosomonas, Bacteroides, Flavobacterium, Rhizobium, Acinetobacter, Zoogloea, Rhodocyclus and Moraxella were shared by five zones, inferring that they were the essential players in treating low C/N (below 5...
July 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28735852/roles-of-quorum-sensing-molecules-from-rhizobium-etli-rt1-in-bacterial-motility-and-biofilm-formation
#2
Swarnita Dixit, Ramesh Chand Dubey, Dinesh Kumar Maheshwari, Prahlad Kishore Seth, Vivek K Bajpai
Strain RT1 was isolated from root nodules of Lens culinaris (a lentil) and characterized as Rhizobium etli (a Gram-negative soil-borne bacterium) by 16S rDNA sequencing and phylogenetic analysis. The signaling molecules produced by R. etli (RT1) were detected and identified by high-performance liquid chromatography coupled with mass spectrometry. The most abundant and biologically active N-acyl homoserine lactone molecules (3-oxo-C8-HSL and 3-OH-C14-HSL) were detected in the ethyl acetate extract of RT1. The biological role of 3-oxo-C8-HSL was evaluated in RT1...
July 8, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28715654/generation-of-stable-infectious-clones-of-plant-viruses-by-using-rhizobium-radiobacter-for-both-cloning-and-inoculation
#3
Decai Tuo, Lanlan Fu, Wentao Shen, Xiaoying Li, Peng Zhou, Pu Yan
A novel Rhizobium radiobacter (synonym Agrobacterium tumefaciens)-mediated approach was developed to generate stable infectious clones of plant viruses. This method uses R. radiobacter for both cloning and inoculation of infectious clones, bypassing the requirement of cloning in E. coli to avoid the instability. Only three steps are included in this method: (i) construct viral genome-encoding plasmids in vitro by one-step Gibson assembly; (ii) transform the assembled DNA products into R. radiobacter; (iii) inoculate plants with the R...
July 14, 2017: Virology
https://www.readbyqxmd.com/read/28711576/explaining-coexistence-of-nitrogen-fixing-and-non-fixing-rhizobia-in-legume-rhizobia-mutualism-using-mathematical-modeling
#4
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/28699873/rhizobium-zeae-sp-nov-isolated-from-maize-zea-mays-l-roots
#5
Lorena Celador-Lera, Esther Menéndez, Alvaro Peix, José M Igual, Encarna Velázquez, Raúl Rivas
A bacterial strain designated CRZM18RT was isolated from a root of Zea mays in Spain. The analysis of the 16S rRNA gene sequence showed that this strain belongs to the genus Rhizobium, with Rhizobium cellulosilyticum ALA10B2T and Rhizobium yantingense H66T being the most closely related species with 98.3 and 97.9 % sequence similarity, respectively. The analysis of the concatenated recA and atpD genes showed that strain CRZM18RT forms a cluster with these species and also with Rhizobiumsmilacinae PTYR-5T, but the recA and atpD genes of strain CRZM18RT were phylogenetically distant, with identities lower than 90 and 96 %, respectively...
July 12, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28696815/autophosphorylation-of-calcium-calmodulin-dependent-protein-kinase-ccamk-at-s343-or-s344-generates-an-intramolecular-interaction-blocking-the-cam-binding
#6
Edgard Jauregui, Liqun Du, Cynthia Gleason, B W Poovaiah
The Ca(2+) and Ca(2+)/calmodulin-dependent protein kinase (CCaMK) is an important effector protein of Ca(2+)/calmodulin-mediated signaling, and in legumes, it is a critical regulator of plant-rhizobia and mycorrhizal symbioses. CCaMK contains a kinase domain, a calmodulin-binding/autoinhibitory domain and a visinin-like domain. Previous studies revealed the presence of two phosphorylation sites, S343 and S344, in the calmodulin-binding domain. Mutations at these sites affected the kinase activity and downstream rhizobium and mycorrhizal symbioses, which highlighted the importance of these residues in regulating protein activity...
July 11, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28681302/hydrocarbon-degradation-potential-and-plant-growth-promoting-activity-of-culturable-endophytic-bacteria-of-lotus-corniculatus-and-oenothera-biennis-from-a-long-term-polluted-site
#7
Małgorzata Pawlik, Barbara Cania, Sofie Thijs, Jaco Vangronsveld, Zofia Piotrowska-Seget
Many endophytic bacteria exert beneficial effects on their host, but still little is known about the bacteria associated with plants growing in areas heavily polluted by hydrocarbons. The aim of the study was characterization of culturable hydrocarbon-degrading endophytic bacteria associated with Lotus corniculatus L. and Oenothera biennis L. collected in long-term petroleum hydrocarbon-polluted site using culture-dependent and molecular approaches. A total of 26 hydrocarbon-degrading endophytes from these plants were isolated...
July 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28678233/novel-impacts-of-functionalized-multi-walled-carbon-nanotubes-in-plants-promotion-of-nodulation-and-nitrogenase-activity-in-the-rhizobium-legume-system
#8
Zhaodong Yuan, Zhongming Zhang, Xiuping Wang, Li Li, Kai Cai, Heyou Han
The rhizobium-legume symbiosis system is critical for nitrogen-cycle balance in agriculture. However, the potential effects of carbon nanomaterials (CNMs) on this system remain largely unknown. Herein, we studied the effects of four carbon-based materials (activated carbon (AC), single-walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO)) on the rhizobium-legume symbiosis system consisting of Lotus japonicus and Mesorhizobium loti MAFF303099. Under non-symbiotic conditions, the bacterial growth and root development of plants were both clearly inhibited by SWCNTs and GO, while the elongation of plant stems was enhanced by MWCNTs to a certain degree...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28664521/ensifer-collicola-sp-nov-a-bacterium-isolated-from-soil-in-south-korea
#9
Jun Hyeong Jang, Dongwook Lee, Seho Cha, Taegun Seo
Strain Mol12(T), which presented in the form of Gram-negative, motile, non-spore forming rod-shaped, was isolated from soil in South Korea and characterized to determine its taxonomic position. The strain grew at 20-30°C (optimum 30°C) and pH 7.0-10.0 (optimum pH 8.0) with 1% (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that the strain Mol12(T) was most closely related to Ensifer terangae LMG 7834(T) (96.78%), Rhizobium daejeonense KCTC 12121(T) (96.43%), Ensifer adhaerens Casida A(T) (96...
July 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28664366/production-characterization-and-structural-modification-of-exopolysaccharide-based-bioflocculant-by-rhizobium-radiobacter-sz4s7s14-and-media-optimization
#10
Bakhtiyor A Rasulov, Li Li, Yong-Hong Liu, Osama Abdalla Mohamad, Min Xiao, Jin-Biao Ma, Wen-Jun Li
Synthesis of the exopolysaccharide-based bioflocculant Rhizobium radiobacter SZ4S7S14 was researched and medium optimized for enhanced production of bioflocculant. D-Mannose and yeast extract were found to be best carbon and nitrogen sources for maximal yield of bioflocculant. The bioflocculant samples obtained in different media with different carbon and nitrogen sources were further analyzed by SEM-EDX and FT-IR. FT-IR spectroscopy of the bioflocculant samples, obtained in different carbon/nitrogen sources showed slight modification of the structures of biopolymers...
July 2017: 3 Biotech
https://www.readbyqxmd.com/read/28648724/nitrogen-fixing-rhizobial-strains-isolated-from-desmodium-incanum-dc-in-argentina-phylogeny-biodiversity-and-symbiotic-ability
#11
María Antonieta Toniutti, Laura Viviana Fornasero, Francisco Javier Albicoro, María Carla Martini, Walter Draghi, Florencia Alvarez, Antonio Lagares, José Francisco Pensiero, María Florencia Del Papa
Desmodium spp. are leguminous plants belonging to the tribe Desmodieae of the subfamily Papilionoideae. They are widely distributed in temperated and subtropical regions and are used as forage plants, for biological control, and in traditional folk medicine. The genus includes pioneer species that resist the xerothermic environment and grow in arid, barren sites. Desmodium species that form nitrogen-fixing symbiosis with rhizobia play an important role in sustainable agriculture. In Argentina, 23 native species of this genus have been found, including Desmodium incanum...
July 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28647822/devosia-nitraria-sp-nov-a-novel-species-isolated-from-the-roots-of-nitraria-sibirica-in-china
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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 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
#18
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/the-crystal-structure-of-a-bacterial-l-arabinonate-dehydratase-contains-a-2fe-2s-cluster
#19
Mohammad Mubinur Rahman, Martina 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 Mg(2+) ion and is buried between two domains, and also at the dimer interface. The active site Lys129 was found to be carbamylated...
June 13, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28561275/screening-for-biosurfactant-production-by-2-4-6-trinitrotoluene-transforming-bacteria
#20
H Avila-Arias, H Avellaneda, V Garzón, G Rodríguez, Z Arbeli, E Garcia-Bonilla, M Villegas-Plazas, F Roldan
AIMS: To 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 sources were added...
May 31, 2017: Journal of Applied Microbiology
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