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https://www.readbyqxmd.com/read/29351606/analysis-of-metal-tolerance-in-rhizobium-leguminosarum-strains-isolated-from-an-ultramafic-soil
#1
Laura Rubio-Sanz, Belén Brito, Jose Palacios
Natural habitats containing high amounts of heavy metals provide a valuable source of bacteria adapted to deal with metal toxicity. A functional analysis of the population of legume endosymbiotic bacteria in an ultramafic soil was undertaken by studying a collection of Rhizobium leguminosarum bv viciae (Rlv) isolates obtained using pea as trap plant. One of the isolates, Rlv UPM1137, was selected on the basis of its higher tolerance to nickel and cobalt and presence of inducible mechanisms for such tolerance...
January 17, 2018: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29351361/pathways-of-nitric-oxide-metabolism-and-operation-of-phytoglobins-in-legume-nodules-missing-links-and-future-directions
#2
Antoine Berger, Renaud Brouquisse, Pradeep Kumar Pathak, Imène Hichri, Inderjit Singh, Sabhyata Bhatia, Alexandre Boscari, Abir U Igamberdiev, Kapuganti Jagadis Gupta
The interaction between legumes and rhizobia leads to the establishment of a beneficial symbiotic relationship. Recent advances in legume - rhizobium symbiosis revealed that various reactive oxygen and nitrogen species including nitric oxide (NO) play important roles during this process. Nodule development occurs with a transition from a normoxic environment during the establishment of symbiosis to a microoxic environment in functional nodules. Such oxygen dynamics are required for activation and repression of various NO production and scavenging pathways...
January 19, 2018: Plant, Cell & Environment
https://www.readbyqxmd.com/read/29349810/medicago-truncatula-copper-transporter-1-mtcopt1-delivers-copper-for-symbiotic-nitrogen-fixation
#3
Marta Senovilla, Rosario Castro-Rodríguez, Isidro Abreu, Viviana Escudero, Igor Kryvoruchko, Michael K Udvardi, Juan Imperial, Manuel González-Guerrero
Copper is an essential nutrient for symbiotic nitrogen fixation. This element is delivered by the host plant to the nodule, where membrane copper (Cu) transporter would introduce it into the cell to synthesize cupro-proteins. COPT family members in the model legume Medicago truncatula were identified and their expression determined. Yeast complementation assays, confocal microscopy and phenotypical characterization of a Tnt1 insertional mutant line were carried out in the nodule-specific M. truncatula COPT family member...
January 19, 2018: New Phytologist
https://www.readbyqxmd.com/read/29346623/a-large-scale-field-study-of-bacterial-communities-in-cereal-aphid-populations-across-morocco
#4
Samir Fakhour, Jérôme Ambroise, François Renoz, Vincent Foray, Jean-Luc Gala, Thierry Hance
Insects are frequently associated with bacteria that can have significant ecological and evolutionary impacts on their hosts. To date, few studies have examined the influence of environmental factors to microbiome composition of aphids. The current work assessed the diversity of bacterial communities of five cereal aphid species (Sitobion avenae, Rhopalosiphum padi, R. maidis, Sipha maydis and Diuraphis noxia) collected across Morocco and covering a wide range of environmental conditions. We aimed to test whether symbiont combinations are host or environment specific...
January 16, 2018: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29342876/improvement-of-verticillium-wilt-resistance-by-applying-arbuscular-mycorrhizal-fungi-to-a-cotton-variety-with-high-symbiotic-efficiency-under-field-conditions
#5
Qiang Zhang, Xinpeng Gao, Yanyun Ren, Xinhua Ding, Jiajia Qiu, Ning Li, Fanchang Zeng, Zhaohui Chu
Arbuscular mycorrhizal fungi (AMF) play an important role in nutrient cycling processes and plant stress resistance. To evaluate the effect of Rhizophagus irregularis CD1 on plant growth promotion (PGP) and Verticillium wilt disease, the symbiotic efficiency of AMF (SEA) was first investigated over a range of 3% to 94% in 17 cotton varieties. The high-SEA subgroup had significant PGP effects in a greenhouse. From these results, the highest-SEA variety of Lumian 1 was selected for a two-year field assay. Consistent with the performance from the greenhouse, the AMF-mediated PGP of Lumian 1 also produced significant results, including an increased plant height, stem diameter, number of petioles, and phosphorus content...
January 13, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29342277/finding-nemo-hybrid-assembly-with-oxford-nanopore-and-illumina-reads-greatly-improves-the-clownfish-amphiprion-ocellaris-genome-assembly
#6
Mun Hua Tan, Christopher M Austin, Michael P Hammer, Yin Peng Lee, Laurence J Croft, Han Ming Gan
Background: Some of the most widely recognised coral-reef fishes are clownfish or anemonefishes, members of the family Pomacentridae (subfamily: Amphiprioninae). They are popular aquarium species due to their bright colours, adaptability to captivity and fascinating behavior. Their breeding biology (sequential hermaphrodites) and symbiotic mutualism with sea anemones have attracted much scientific interest. Moreover, there are some curious geographic-based phenotypes which warrant investigation...
January 12, 2018: GigaScience
https://www.readbyqxmd.com/read/29338798/high-diversity-and-low-genetic-structure-of-feather-mites-associated-with-a-phenotypically-variable-bird-host
#7
Sofía Fernández-González, Antón Pérez-Rodríguez, Heather C Proctor, Iván De la Hera, Javier Pérez-Tris
Obligate symbionts may be genetically structured among host individuals and among phenotypically distinct host populations. Such processes may in turn determine within-host genetic diversity of symbionts, which is relevant for understanding symbiont population dynamics. We analysed the population genetic structure of two species of feather mites (Proctophyllodes sylviae and Trouessartia bifurcata) in migratory and resident blackcaps Sylvia atricapilla that winter sympatrically. Resident and migratory hosts may provide mites with habitats of different qualities, what might promote specialization of mite populations...
January 17, 2018: Parasitology
https://www.readbyqxmd.com/read/29337641/strain-specific-symbiotic-genes-a-new-level-of-control-in-the-intracellular-accommodation-of-rhizobia-within-legume-nodule-cells
#8
B Gourion, Benoit Alunni
This is a short commentary on the article by Wang et al. published in MPMI Vol. 31, No. 2, pages 240-248.
January 16, 2018: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29336852/brazilian-species-of-calliandra-benth-tribe-ingeae-are-nodulated-by-diverse-strains-of-paraburkholderia
#9
Verônica Cordeiro Silva, Patricia Alves Casaes Alves, Mariana Ferreira Kruschewsky Rhem, José Miguel Ferreira Dos Santos, Euan K James, Eduardo Gross
The Chapada Diamantina in NE of Brazil is a biodiversity hotspot and a center of radiation for many Neotropical legume genera, such as Calliandra and Mimosa. The present study aimed to evaluate nodulation in Calliandra species endemic to various environments, and to characterize the diversity of their symbiotic rhizobia using housekeeping (16S rRNA, recA) and plasmid-borne, symbiosis-related (nifH and nodC) genes. The nodulation ability of selected isolates was assessed. All of the 126 bacterial isolates from 18 Calliandra species collected in six different vegetation types were identified as Paraburkholderia according to their housekeeping and symbiosis gene phylogenies...
January 5, 2018: Systematic and Applied Microbiology
https://www.readbyqxmd.com/read/29335919/inter-and-intracellular-colonization-of-arabidopsis-roots-by-endophytic-actinobacteria-and-the-impact-of-plant-hormones-on-their-antimicrobial-activity
#10
Anne van der Meij, Joost Willemse, Martinus A Schneijderberg, René Geurts, Jos M Raaijmakers, Gilles P van Wezel
Many actinobacteria live in close association with eukaryotes such as fungi, insects, animals and plants. Plant-associated actinobacteria display (endo)symbiotic, saprophytic or pathogenic life styles, and can make up a substantial part of the endophytic community. Here, we characterised endophytic actinobacteria isolated from root tissue of Arabidopsis thaliana (Arabidopsis) plants grown in soil from a natural ecosystem. Many of these actinobacteria belong to the family of Streptomycetaceae with Streptomyces olivochromogenes and Streptomyces clavifer as well represented species...
January 15, 2018: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29335550/the-peg-responding-desiccome-of-the-alder-microsymbiont-frankia-alni
#11
Kais Ghedira, Emna Harigua-Souiai, Cherif Ben Hamda, Pascale Fournier, Petar Pujic, Sihem Guesmi, Ikram Guizani, Guylaine Miotello, Jean Armengaud, Philippe Normand, Haïtham Sghaier
Actinorhizal plants are ecologically and economically important. Symbiosis with nitrogen-fixing bacteria allows these woody dicotyledonous plants to colonise soils under nitrogen deficiency, water-stress or other extreme conditions. However, proteins involved in xerotolerance of symbiotic microorganisms have yet to be identified. Here we characterise the polyethylene glycol (PEG)-responding desiccome from the most geographically widespread Gram-positive nitrogen-fixing plant symbiont, Frankia alni, by next-generation proteomics, taking advantage of a Q-Exactive HF tandem mass spectrometer equipped with an ultra-high-field Orbitrap analyser...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29334470/heterologous-expression-of-rhizobial-celc2-cellulase-impairs-symbiotic-signaling-and-nodulation-in-medicago-truncatula
#12
Marta Robledo, Esther Menéndez, Jose Ignacio Jimenez-Zurdo, Raúl Rivas, Encarna Velazquez, Eustoquio Martinez-Molina, Giles Oldroyd, Pedro F Mateos
The infection of legume plants by rhizobia is tightly regulated to ensure accurate bacterial penetration, infection and development of functionally efficient nitrogen-fixing root nodules. Rhizobial Nod Factors (NF) have key roles in the elicitation of nodulation signalling. Infection of white clover roots also involves the tightly regulated specific breakdown of the non-crystalline apex of cell walls in growing root hairs, which is mediated by Rhizobium leguminosarum bv. trifolii cellulase CelC2. Here, we have analyzed the impact of this endoglucanase on symbiotic signalling in the model legume Medicago truncatula...
January 15, 2018: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29333583/the-microbial-community-of-tardigrades-environmental-influence-and-species-specificity-of-microbiome-structure-and-composition
#13
Matteo Vecchi, Irene L G Newton, Michele Cesari, Lorena Rebecchi, Roberto Guidetti
Symbiotic associations of metazoans with bacteria strongly influence animal biology since bacteria are ubiquitous and virtually no animal is completely free from them. Tardigrades are micrometazoans famous for their ability to undergo ametabolic states (cryptobiosis) but very little information is available on potential microbial associations. We characterized the microbiomes of six limnoterrestrial tardigrade species belonging to several phylogenetic lines in tandem with the microbiomes of their respective substrates...
January 15, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/29331014/biochemical-characterization-of-recombinant-thermostable-cohnella-sp-a01-%C3%AE-glucanase
#14
Meysam Rezaie, Saeed Aminzadeh, Farid Heidari, Masoud Mashhadi Akbar Boojar, Ali Asghar Karkhane
Background: Typically, non-cellulytic glucanase, including fungi and yeast cell wall hydrolyzing enzymes, are release by some symbiotic fungi and plants during the mycoparasitic fungi attack on plants. These enzymes are known as the defense mechanisms of plants. This study intends to investigate the biochemical properties of β-1,6-glucanase (bg16M) from native thermophilic bacteria, Cohnella A01. Methods: bg16M gene was cloned and expressed in E. coli BL21 (DE3)...
January 13, 2018: Iranian Biomedical Journal
https://www.readbyqxmd.com/read/29330647/absence-of-the-nitrous-oxide-reductase-gene-cluster-in-commercial-alfalfa-inoculants-is-probably-due-to-the-extensive-loss-of-genes-during-rhizobial-domestication
#15
Silvina Brambilla, Romina Frare, Gabriela Soto, Cintia Jozefkowicz, Nicolás Ayub
As other legume crops, alfalfa cultivation increases the emission of the greenhouse gas nitrous oxide (N2O). Since legume-symbiotic nitrogen-fixing bacteria play a crucial role in this emission, it is important to understand the possible impacts of rhizobial domestication on the evolution of denitrification genes. In comparison with the genomes of non-commercial strains, those of commercial alfalfa inoculants exhibit low total genome size, low number of ORFs and high numbers of both frameshifted genes and pseudogenes, suggesting a dramatic loss of genes during bacterial domestication...
January 12, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/29330535/the-stoichiometry-of-coral-dinoflagellate-symbiosis-carbon-and-nitrogen-cycles-are-balanced-in-the-recycling-and-double-translocation-system
#16
Yasuaki Tanaka, Atsushi Suzuki, Kazuhiko Sakai
Symbioses between microalgae and animal hosts have the advantage of acquiring and sharing autotrophically produced organic carbon (C) as their energy source. However, the stoichiometry and turnover rates of biological elements in symbioses are not fully understood because of complicated metabolic interactions. We report the first comprehensive and simultaneous measurement of C and nitrogen (N) flows through coral-dinoflagellate symbiosis by using the unique approach of dual-isotope labeling with 13C and 15N, in situ chasing, and isotope-mixing models...
January 12, 2018: ISME Journal
https://www.readbyqxmd.com/read/29330187/acquisition-of-a-novel-sulfur-oxidizing-symbiont-in-the-gutless-marine-worm-inanidrilus-exumae
#17
C Bergin, C Wentrup, N Brewig, A Blazejak, C Erséus, O Giere, M Schmid, P De Wit, N Dubilier
Gutless phallodrilines are marine annelid worms without a mouth or gut, which live in an obligate association with multiple bacterial endosymbionts that supply them with nutrition. In this study, we discovered an unusual symbiont community in the gutless phallodriline Inanidrilus exumae that differs markedly from the microbiome of all other 22 examined host species. Comparative 16S rRNA gene sequence analysis and fluorescence in situ hybridization revealed that I. exumae harboured co-occurring gamma-, alpha- and deltaproteobacterial symbionts, while all other known host species harbour gamma- and either alpha- or deltaproteobacterial symbionts...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29328512/economy-of-scale-third-partner-strengthens-a-keystone-ant-plant-mutualism
#18
Kirsten M Prior, Todd M Palmer
While foundation species can stabilize ecosystems at landscape scales, their ability to persist is often underlain by keystone interactions occurring at smaller scales. Acacia drepanolobium is a foundation tree, comprising >95% of woody cover in East African black-cotton savanna ecosystems. Its dominance is underlain by a keystone mutualistic interaction with several symbiotic ant species in which it provides housing (swollen thorns) and carbohydrate-rich nectar from extra-floral nectaries (EFN). In return, it gains protection from catastrophic damage from mega-herbivores...
January 12, 2018: Ecology
https://www.readbyqxmd.com/read/29327481/the-genome-and-microbiome-of-a-dikaryotic-fungus-inocybe-terrigena-inocybaceae-revealed-by-metagenomics
#19
Mohammad Bahram, Dan Vanderpool, Mari Pent, Markus Hiltunen, Martin Ryberg
Recent advances in molecular methods have increased our understanding of various fungal symbioses. However, little is known about genomic and microbiome features of most uncultured symbiotic fungal clades. Here, we analysed the genome and microbiome of Inocybaceae (Agaricales, Basidiomycota), a largely uncultured ectomycorrhizal clade known to form symbiotic associations with a wide variety of plant species. We used metagenomic sequencing and assembly of dikaryotic fruiting-body tissues from Inocybe terrigena (Fr...
January 12, 2018: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/29327464/the-expression-of-an-exogenous-acc-deaminase-by-the-endophyte-serratia-grimesii-bxf1-promotes-the-early-nodulation-and-growth-of-common-bean
#20
Maria J Tavares, Francisco X Nascimento, Bernard R Glick, Márcio J Rossi
Ethylene acts as an inhibitor of the nodulation process of leguminous plants. However, some bacteria can decrease deleterious ethylene levels by the action of the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase which degrades ACC, the ethylene precursor in all higher plants. Co-inoculation of rhizobia with endophytes enhances the rhizobial symbiotic efficiency with legumes, improving both nodulation and nitrogen fixation. However, not much is understood about the mechanisms employed by these endophytic bacteria...
January 11, 2018: Letters in Applied Microbiology
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