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Systematic and Applied Microbiology

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https://www.readbyqxmd.com/read/28216096/alkalinity-of-lanzarote-soils-is-a-factor-shaping-rhizobial-populations-with-sinorhizobium-meliloti-being-the-predominant-microsymbiont-of-lotus-lancerottensis
#1
Milagros León-Barrios, Juan Pérez-Yépez, Paola Dorta, Ana Garrido, Concepción Jiménez
Lotus lancerottensis is an endemic species that grows widely throughout Lanzarote Island (Canary Is.). Characterization of 48 strains isolated from root nodules of plants growing in soils from eleven locations on the island showed that 38 isolates (79.1%) belonged to the species Sinorhizobium meliloti, whereas only six belonged to Mesorhizobium sp., the more common microsymbionts for the Lotus. Other genotypes containing only one isolate were classified as Pararhizobium sp., Sinorhizobium sp., Phyllobacterium sp...
February 2, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28214058/phylogenetic-multilocus-sequence-analysis-of-indigenous-slow-growing-rhizobia-nodulating-cowpea-vigna-unguiculata-l-in-greece
#2
Anastasia P Tampakaki, Christos T Fotiadis, Georgia Ntatsi, Dimitrios Savvas
Cowpea (Vigna unguiculata) is a promiscuous grain legume, capable of establishing efficient symbiosis with diverse symbiotic bacteria, mainly slow-growing rhizobial species belonging to the genus Bradyrhizobium. Although much research has been done on cowpea-nodulating bacteria in various countries around the world, little is known about the genetic and symbiotic diversity of indigenous cowpea rhizobia in European soils. In the present study, the genetic and symbiotic diversity of indigenous rhizobia isolated from field-grown cowpea nodules in three geographically different Greek regions were studied...
February 2, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28209394/ensifer-shofinae-sp-nov-a-novel-rhizobial-species-isolated-from-root-nodules-of-soybean-glycine-max
#3
Wen Hao Chen, Sheng Hui Yang, Zhao Hu Li, Xiao Xia Zhang, Xin Hua Sui, En Tao Wang, Wen Xin Chen, Wen Feng Chen
Two bacterial strains isolated from root nodules of soybean were characterized phylogenetically as members of a distinct group in the genus Ensifer based on 16S rRNA gene comparisons. They were also verified as a separated group by the concatenated sequence analyses of recA, atpD and glnII (with similarities ≤93.9% to the type strains for defined species), and by the average nucleotide identities (ANI) between the whole genome sequence of the representative strain CCBAU 251167(T) and those of the closely related strains in Ensifer glycinis and Ensifer fredii (90...
February 2, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28094097/diverse-genotypes-of-bradyrhizobium-nodulate-herbaceous-chamaecrista-moench-fabaceae-caesalpinioideae-species-in-brazil
#4
José Miguel Ferreira Dos Santos, Patricia Alves Casaes Alves, Verônica Cordeiro Silva, Mariana Ferreira Kruschewsky Rhem, Euan K James, Eduardo Gross
The genus Chamaecrista comprises more than 330 species which are mainly distributed across tropical America, especially in Brazil (256 spp.), the main center of radiation. In this study, nodulation of herbaceous Chamaecrista species that are commonly found growing in different vegetation types in the north eastern Brazilian state of Bahia was assessed together with the diversity of rhizobia isolated from their root nodules. Genetic characterization of the isolates was performed using molecular markers to examine the phylogeny of their "core" (16S rRNA, ITS, recA, glnII, dnaK and gyrB) and symbiosis-related (nifH, nodC) genomes...
January 10, 2017: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28081924/physiological-and-gene-expression-responses-to-nitrogen-regimes-and-temperatures-in-mastigocladus-sp-strain-chp1-a-predominant-thermotolerant-cyanobacterium-of-hot-springs
#5
M Estrella Alcamán, Jaime Alcorta, Birgitta Bergman, Mónica Vásquez, Martin Polz, Beatriz Díez
Cyanobacteria are widely distributed primary producers with significant implications for the global biogeochemical cycles of carbon and nitrogen. Diazotrophic cyanobacteria of subsection V (Order Stigonematales) are particularly ubiquitous in photoautotrophic microbial mats of hot springs. The Stigonematal cyanobacterium strain CHP1 isolated from the Porcelana hot spring (Chile) was one of the major contributors of the new nitrogen through nitrogen fixation. Further morphological and genetic characterization verified that the strain CHP1 belongs to Stigonematales, and it formed a separate clade together with other thermophiles of the genera Fischerella and Mastigocladus...
December 28, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28081923/analysis-of-rhizobial-endosymbionts-of-vicia-lathyrus-and-trifolium-species-used-to-maintain-mountain-firewalls-in-sierra-nevada-national-park-south-spain
#6
Pablo J Villadas, Ana V Lasa, Pilar Martínez-Hidalgo, José David Flores-Félix, Eustoquio Martínez-Molina, Nicolás Toro, Encarna Velázquez, Manuel Fernández-López
Forest fires lead to the annual disappearance of many natural formations that require the creation of firewall areas. They can be maintained by enriching their pastures with attractive plants for grazing livestock, mainly legumes, which have a high protein content and low dependence on N fertilizers due to their ability to establish nitrogen-fixing symbiosis with rhizobia. In this study, the rhizobia isolated from the nodules of six legumes from the genera Vicia, Lathyrus and Trifolium were analysed in a firewall zone established in Lanjarón (Granada) close to the Sierra Nevada National Park (Spain)...
December 28, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28063627/competition-between-rhizobia-under-different-environmental-conditions-affects-the-nodulation-of-a-legume
#7
Zhao Jun Ji, Hui Yan, Qing Guo Cui, En Tao Wang, Wen Feng Chen, Wen Xin Chen
Mutualistic symbiosis and nitrogen fixation of legume rhizobia play a key role in ecological environments. Although many different rhizobial species can form nodules with a specific legume, there is often a dominant microsymbiont, which has the highest nodule occupancy rates, and they are often known as the "most favorable rhizobia". Shifts in the most favorable rhizobia for a legume in different geographical regions or soil types are not well understood. Therefore, in order to explore the shift model, an experiment was designed using successive inoculations of rhizobia on one legume...
December 27, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28040300/neptuniibacter-pectenicola-sp-nov-and-neptuniibacter-marinus-sp-nov-two-novel-species-isolated-from-a-great-scallop-pecten-maximus-hatchery-in-norway-and-emended-description-of-the-genus-neptuniibacter
#8
Ana L Diéguez, Sabela Balboa, Thorolf Magnesen, Jesús L Romalde
Nine isolates obtained from a great scallop hatchery in Norway were characterized using a polyphasic approach. Strains were Gram-negative, aerobic and motile rods with oxidative metabolism. Phylogenetic analysis based on the sequences of 16S rRNA and rpoB genes showed that these strains formed two different groups associated with members of the genus Neptuniibacter. DNA-DNA hybridization (DDH) and Average Nucleotide Identity (ANI) demonstrated that the isolates constituted two novel species of this genus, which can be phenotypically differentiated from their closest relatives...
December 21, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/28057375/description-of-a-new-anaerobic-thermophilic-bacterium-thermoanaerobacterium-butyriciformans-sp-nov
#9
G López, S J Cañas-Duarte, A M Pinzón-Velasco, N E Vega-Vela, M Rodríguez, S Restrepo, S Baena
Strain USBA-019(T), an anaerobic and thermophilic strain, was identified as a new member of the genus Thermoanaerobacterium. USBA-019(T) cells are gram-positive, strictly anaerobic, thermophilic, chemoorganotrophic, moderately acidophilic, non-motile, endospore-forming, slightly curved, and rod-shaped. Cells measure 0.4×3.0-7.0μm. Optimal growth occurs at 50-55°C (35-65°C). Optimum pH is 5.0-5.5 (4.0-8.5). Thiosulfate, elemental sulfur and nitrate were utilized as electron acceptors. Fermentation of glucose, lactose, cellobiose, galactose, arabinose, xylose, starch and xylan primarily produced acetate and butyrate...
December 16, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27939530/diverse-mesorhizobium-bacteria-nodulate-native-astragalus-and-oxytropis-in-arctic-and-subarctic-areas-in-eurasia
#10
Osei Yaw Ampomah, Seyed Abdollah Mousavi, Kristina Lindström, Kerstin Huss-Danell
Rhizobia nodulating native Astragalus and Oxytropis spp. in Northern Europe are not well-studied. In this study, we isolated bacteria from nodules of four Astragalus spp. and two Oxytropis spp. from the arctic and subarctic regions of Sweden and Russia. The phylogenetic analyses were performed by using sequences of three housekeeping genes (16S rRNA, rpoB and recA) and two accessory genes (nodC and nifH). The results of our multilocus sequence analysis (MLSA) of the three housekeeping genes tree showed that all the 13 isolates belonged to the genus Mesorhizobium and were positioned in six clades...
November 30, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27931747/genetic-diversity-and-population-structure-of-food-borne-staphylococcus-carnosus-strains
#11
Anne Bückle Née Müller, Markus Kranz, Herbert Schmidt, Agnes Weiss
The species Staphylococcus carnosus is a non-pathogenic representative of the coagulase negative staphylococci. Specific strains are applied as meat starter cultures. The species consists of two subspecies, S. carnosus ssp. carnosus and S. carnosus ssp. utilis. In order to place S. carnosus strains, characterized in former studies, in a genetic background that allows a typing of candidates for starter cultures, a Multilocus Sequence Typing (MLST) scheme was developed. Internal fragments of the genes tpiA, xprT, dat, gmk, glpK, narG, cstA, encoding triosephosphate isomerase, xanthine phosphoribosyltransferase, d-amino acid aminotransferase, guanylate kinase, glycerol kinase, the α-chain of the respiratory nitrate reductase, and a carbon starvation protein where chosen...
November 30, 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27776911/genomic-characterization-of-a-fructophilic-bee-symbiont-lactobacillus-kunkeei-reveals-its-niche-specific-adaptation
#12
Shintaro Maeno, Yasuhiro Tanizawa, Yu Kanesaki, Eri Kubota, Himanshu Kumar, Leon Dicks, Seppo Salminen, Junichi Nakagawa, Masanori Arita, Akihito Endo
Lactobacillus kunkeei is classified as a sole obligate fructophilic lactic acid bacterium that is found in fructose-rich niches, including the guts of honeybees. The species is differentiated from other lactobacilli based on its poor growth with glucose, enhanced growth in the presence of oxygen and other electron acceptors, and production of high concentrations of acetate from the metabolism of glucose. These characteristics are similar to phylogenetically distant Fructobacillus spp. In the present study, the genomic structure of L...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27771162/multi-locus-sequence-analysis-and-symbiotic-characterization-of-novel-ensifer-strains-nodulating-tephrosia-spp-in-the-indian-thar-desert
#13
Nisha Tak, Esha Awasthi, Garima Bissa, Raju Ram Meghwal, Euan K James, Janet S Sprent, Hukam S Gehlot
Phylogenetically diverse Ensifer strains associated with five species of Tephrosia growing in alkaline soils of semi-arid regions of the Thar Desert were characterized using multi locus sequence analysis. Based on 16S rRNA and four protein-coding housekeeping gene (recA, atpD, glnII and dnaK) sequences, the Tephrosia-Ensifer strains were genetically different from the type strains of Ensifer saheli, Ensifer kostiensis, Ensifer terangae (African origin) and Ensifer psoraleae (Asiatic origin). One strain, Ensifer sp...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27745752/varibaculum-anthropi-sp-nov-represented-by-three-genetically-different-genomovars-isolated-from-clinical-material-and-emended-description-of-the-genus-varibaculum
#14
Stefanie P Glaeser, Swapnil Doijad, Muaz Hijazin, Trinad Chakraborty, Enevold Falsen, Val Hall, Peter Kämpfer
During the years 1994-2011 five strictly anaerobic, Gram-stain-positive, diphtheroid bacteria (strains CCUG 31793(T), CCUG 44221, CCUG 61255, CCUG 45114, and CCUG 44993) were isolated from different clinical samples in Sweden and the United Kingdom. Comparative analysis of 16S rRNA gene sequences showed that the five strains shared 99-100% 16S rRNA gene sequence similarity among each other and 98.3-98.6% sequence similarity to Varibaculum cambriense DSM 15806(T). Genomic fingerprint patterns generated with ERIC-, BOX-, and RAPD-PCR, and whole genome sequence (WGS) based comparison by in silico DNA-DNA hybridization (isDDH), average nucleotide identity (ANI) analysis and six housekeeping gene (atpA, rpoB, pgi, metG, gltA and gyrA) based multilocus sequence analysis (MLSA) showed that the strains could be differentiated from V...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27729171/discrimination-and-divergence-among-lactobacillus-plantarum-group-lpg-isolates-with-reference-to-their-probiotic-functionalities-from-vegetable-origin
#15
Sundru Manjulata Devi, Subramanian Aishwarya, Prakash M Halami
The present study was aimed to evaluate the diversity and probiotic properties of Lactobacillus plantarum-group cultures from vegetable origin. First, genotypic diversity of L. plantarum (n=34) was achieved by PCR of Random Amplified Polymorphic DNA and recA gene-specific multiplex PCR. The isolates were segregated into five groups namely, Lactobacillus pentosus, Lactobacillus paraplantarum, Lactobacillus arizonensis, Lactobacillus plantarum subsp. plantarum and argentoratensis. Further discrimination was achieved by restriction fragment length polymorphism of probiotic adhesion genes viz...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27726901/phylogenomic-re-assessment-of-the-thermophilic-genus-geobacillus
#16
Habibu Aliyu, Pedro Lebre, Jochen Blom, Don Cowan, Pieter De Maayer
Geobacillus is a genus of Gram-positive, aerobic, spore-forming obligate thermophiles. The descriptions and subsequent affiliations of the species in the genus have mostly been based on polyphasic taxonomy rules that include traditional sequence-based methods such as DNA-DNA hybridization and comparison of 16S rRNA gene sequences. Currently, there are fifteen validly described species within the genus. The availability of whole genome sequences has provided an opportunity to validate and/or re-assess these conventional estimates of genome relatedness...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27720237/novel-volatiles-of-skin-borne-bacteria-inhibit-the-growth-of-gram-positive-bacteria-and-affect-quorum-sensing-controlled-phenotypes-of-gram-negative-bacteria
#17
Marie Chantal Lemfack, Srinivasa Rao Ravella, Nicola Lorenz, Marco Kai, Kirsten Jung, Stefan Schulz, Birgit Piechulla
The skin microbiota is import for body protection. Here we present the first comprehensive analysis of the volatile organic compound (VOC) profiles of typical skin-resident corynebacterial and staphylococcal species. The VOC profile of Staphylococcus schleiferi DSMZ 4807 was of particular interest as it is dominated by two compounds, 3-(phenylamino)butan-2-one and 3-(phenylimino)butan-2-one (schleiferon A and B, respectively). Neither of these has previously been reported from natural sources. Schleiferon A and B inhibited the growth of various Gram-positive species and affected two quorum-sensing-dependent phenotypes - prodigiosin accumulation and bioluminescence - of Gram-negative bacteria...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27712916/mesorhizobium-olivaresii-sp-nov-isolated-from-lotus-corniculatus-nodules
#18
María J Lorite, José David Flores-Félix, Álvaro Peix, Juan Sanjuán, Encarna Velázquez
In this study four Mesorhizobium strains isolated from Lotus corniculatus nodules in Granada (Spain) were characterized. Their 16S rRNA gene sequences were closely related to those of M. albiziae LMG 23507(T) and M. chacoense Pr5(T) showing 99.4 and 99.2% similarity values, respectively. The analysis of concatenated rpoB, recA, atpD and glnII genes showed they formed a cluster with internal similarities higher than 97%. The closest species also were M. albiziae LMG 23507(T) and M. chacoense Pr5(T) showing similarity values lower than 92% in rpoB, recA and glnII genes and lower than 96...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27712915/comparative-genomics-unravels-metabolic-differences-at-the-species-and-or-strain-level-and-extremely-acidic-environmental-adaptation-of-ten-bacteria-belonging-to-the-genus-acidithiobacillus
#19
Xian Zhang, Siyuan She, Weiling Dong, Jiaojiao Niu, Yunhua Xiao, Yili Liang, Xueduan Liu, Xiaoxia Zhang, Fenliang Fan, Huaqun Yin
Members of the Acidithiobacillus genus are widely found in extreme environments characterized by low pH and high concentrations of toxic substances, thus it is necessary to identify the cellular mechanisms needed to cope with these harsh conditions. Pan-genome analysis of ten bacteria belonging to the genus Acidithiobacillus suggested the existence of core genome, most of which were assigned to the metabolism-associated genes. Additionally, the unique genes of Acidithiobacillus ferrooxidans were much less than those of other species...
December 2016: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/27693041/vibrio-barjaei-sp-nov-a-new-species-of-the-mediterranei-clade-isolated-in-a-shellfish-hatchery
#20
Javier Dubert, Sabela Balboa, María Regueira, Adrián González-Castillo, Bruno Gómez-Gil, Jesús L Romalde
Seven isolates were obtained from different culture stages of carpet shell clam (Ruditapes decussatus) reared in a bivalve hatchery (Galicia, NW Spain). Three groups were differentiated by genotyping techniques and phenotypic profiles and representative trains were selected to further taxonomic studies. These strains were studied by a polyphasic approach and in basis of the phylogenetic analysis based on concatenated sequences of the five housekeeping genes ftsZ, gyrB, pyrH, recA and rpoA formed a tight group into the Mediterranei clade of the genus Vibrio...
December 2016: Systematic and Applied Microbiology
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