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Plant microbial interaction

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https://www.readbyqxmd.com/read/29345309/microbial-mitigation-exacerbation-continuum-a-novel-framework-for-microbiome-effects-on-hosts-in-the-face-of-stress
#1
Aaron S David, Khum B Thapa-Magar, Michelle E Afkhami
A key challenge to understanding microbiomes and their role in ecological processes is contextualizing their effects on host organisms, particularly when faced with environmental stress. One influential theory, the Stress Gradient Hypothesis, might predict that the frequency of positive interactions increases with stressful conditions such that microbial taxa would mitigate harmful effects on host performance. Yet, equally plausible is that microbial taxa could exacerbate these effects. Here, we introduce the "Mitigation-Exacerbation Continuum" as a novel framework to conceptualize microbial mediation of stress...
January 18, 2018: Ecology
https://www.readbyqxmd.com/read/29330533/soil-contamination-alters-the-willow-root-and-rhizosphere-metatranscriptome-and-the-root-rhizosphere-interactome
#2
Etienne Yergeau, Julien Tremblay, Simon Joly, Michel Labrecque, Christine Maynard, Frederic E Pitre, Marc St-Arnaud, Charles W Greer
Phytoremediation using willows is thought to be a sustainable alternative to traditional remediation techniques involving excavation, transport, and landfilling. However, the complexity of the interaction between the willow and its associated highly diverse microbial communities makes the optimization of phytoremediation very difficult. Here, we have sequenced the rhizosphere metatranscriptome of four willow species and the plant root metatranscriptome for two willow species growing in petroleum hydrocarbon-contaminated and non-contaminated soils on a former petroleum refinery site...
January 12, 2018: ISME Journal
https://www.readbyqxmd.com/read/29330479/titania-tio2-nanoparticles-enhance-the-performance-of-growth-promoting-rhizobacteria
#3
Salme Timmusk, Gulaim Seisenbaeva, Lawrence Behers
A novel use of nanotitania (TNs) as agents in the nanointerface interaction between plants and colonization of growth promoting rhizobacteria (PGPR) is presented. The effectiveness of PGPRs is related to the effectiveness of the technology used for their formulation. TNs produced by the Captigel patented SolGel approach, characterized by the transmission and scanning electron microscopy were used for formulation of the harsh environment PGPR strains. Changes in the biomass of wheat seedlings and in the density of single and double inoculants with and without TNs were monitored during two weeks of stress induced by drought salt and by the pathogen Fusarium culmorum...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329457/a-novel-application-of-rnase-h2-dependent-quantitative-pcr-for-detection-and-quantification-of-grosmannia-clavigera-a-mountain-pine-beetle-fungal-symbiont-in-environmental-samples
#4
Chandra H McAllister, Colleen E Fortier, Kate R St Onge, Bianca M Sacchi, Meaghan J Nawrot, Troy Locke, Janice E K Cooke
Mountain pine beetle (Dendroctonus ponderosae Hopkins; MPB) is an economically and ecologically important pest of pine species in western North America. Mountain pine beetles form complex multipartite relationships with microbial partners, including the ophiostomoid fungi Grosmannia clavigera (Robinson-Jeffrey and Davidson) Zipfel, de Beer and Wingfield, Ophiostoma montium (Rumbold) von Arx, Grosmannia aurea (Robinson-Jeffrey and Davidson) Zipfel, de Beer and Wingfield, Leptographium longiclavatum (Lee, Kim, and Breuil) and Leptographium terebrantis (Barras and Perry)...
January 10, 2018: Tree Physiology
https://www.readbyqxmd.com/read/29329376/soil-microbial-species-loss-affects-plant-biomass-and-survival-of-an-introduced-bacterial-strain-but-not-inducible-plant-defences
#5
Viola Kurm, Wim H van der Putten, Ana Pineda, W H Gera Hol
Background and Aims: Plant growth-promoting rhizobacteria (PGPR) strains can influence plant-insect interactions. However, little is known about the effect of changes in the soil bacterial community in general and especially the loss of rare soil microbes on these interactions. Here, the influence of rare soil microbe reduction on induced systemic resistance (ISR) in a wild ecotype of Arabidopsis thaliana against the aphid Myzus persicae was investigated. Methods: To create a gradient of microbial abundances, soil was inoculated with a serial dilution of a microbial community and responses of Arabidopsis plants that originated from the same site as the soil microbes were tested...
January 10, 2018: Annals of Botany
https://www.readbyqxmd.com/read/29327437/intra-species-variation-in-a-widely-distributed-tree-species-regulates-the-responses-of-soil-microbiome-to-different-temperature-regimes
#6
Cui-Jing Zhang, Manuel Delgado-Baquerizo, John E Drake, Peter B Reich, Mark G Tjoelker, David T Tissue, Jun-Tao Wang, Ji-Zheng He, Brajesh K Singh
Plant characteristics in different provenances within a single species may vary in response to climate change, which might alter soil microbial communities and ecosystem functions. We conducted a glasshouse experiment and grew seedlings of three provenances (temperate, subtropical and tropical origins) of a tree species (i.e. Eucalyptus tereticornis) at different growth temperatures (18, 21.5, 25, 28.5, 32 and 35.5°C) for 54 days. At the end of the experiment, bacterial and fungal community composition, diversity and abundance were characterized...
January 12, 2018: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/29319512/comparison-of-microbial-communities-associated-with-halophyte-salsola-stocksii-and-non-halophyte-triticum-aestivum-using-culture-independent-approaches
#7
Salma Mukhtar, Ayesha Ishaq, Sara Hassan, Samina Mehnaz, Muhammad S Mirza, Kauser A Malik
Halophyte microbiome contributes significantly to plant performance and can provide information regarding complex ecological processes involved in osmoregulation of these plants. The objective of this study is to investigate the microbiomes associated with belowground (rhizosphere), internal (endosphere) and aboveground (phyllosphere) tissues of halophyte (Salsola stocksii) through metagenomics approach. Plant samples were collected from Khewra Salt Mines. The metagenomic DNA from soil, root and shoot samples was isolated with the help of FastDNA spin kit...
September 27, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/29313197/exploiting-rhizosphere-microbial-cooperation-for-developing-sustainable-agriculture-strategies
#8
Yoann Besset-Manzoni, Laura Rieusset, Pierre Joly, Gilles Comte, Claire Prigent-Combaret
The rhizosphere hosts a considerable microbial community. Among that community, bacteria called plant growth-promoting rhizobacteria (PGPR) can promote plant growth and defense against diseases using diverse distinct plant-beneficial functions. Crop inoculation with PGPR could allow to reduce the use of pesticides and fertilizers in agrosystems. However, microbial crop protection and growth stimulation would be more efficient if cooperation between rhizosphere bacterial populations was taken into account when developing biocontrol agents and biostimulants...
January 8, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29302994/environmental-impact-and-bioremediation-of-seleniferous-soils-and-sediments
#9
Shrutika L Wadgaonkar, Yarlagadda V Nancharaiah, Giovanni Esposito, Piet N L Lens
Selenium concentrations in the soil environment are directly linked to its transfer in the food chain, eventually causing either deficiency or toxicity associated with several physiological dysfunctions in animals and humans. Selenium bioavailability depends on its speciation in the soil environment, which is mainly influenced by the prevailing pH, redox potential, and organic matter content of the soil. The selenium cycle in the environment is primarily mediated through chemical and biological selenium transformations...
January 5, 2018: Critical Reviews in Biotechnology
https://www.readbyqxmd.com/read/29301368/antimicrobial-activities-of-european-propolis-collected-from-various-geographic-origins-alone-and-in-combination-with-antibiotics
#10
Issam Al-Ani, Stefan Zimmermann, Jürgen Reichling, Michael Wink
Background: Propolis consists of a complex mixture of resinous substances collected by honeybees from different plant sources. The objective of this study was to investigate the chemical composition, biological activities, and synergistic properties with antibiotics of propolis samples collected from various geographic origins (Germany, Ireland, and Czech Republic). Methods: The chemical composition of the propolis was analyzed by Gas Liquid Chromatography-Mass Spectrometry (GLC-MS) and High-performance liquid chromatography (HPLC)...
January 3, 2018: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/29301047/the-effects-of-dispersal-and-predator-density-on-prey-survival-in-an-insect-red-clover-metacommunity
#11
David J Stasek, James N Radl, Thomas O Crist
Trophic interactions are often studied within habitat patches, but among-patch dispersal of individuals may influence local patch dynamics. Metacommunity concepts incorporate the effects of dispersal on local and community dynamics. There are few experimental tests of metacommunity theory using insects compared to those conducted in microbial microcosms. Using connected experimental mesocosms, we varied the density of the leafhopper Agallia constricta Van Duzee (Homoptera: Cicadellidae) and a generalist insect predator, the damsel bug (Nabis spp...
January 1, 2018: Journal of Insect Science
https://www.readbyqxmd.com/read/29291484/impacts-of-design-configuration-and-plants-on-the-functionality-of-the-microbial-community-of-mesocosm-scale-constructed-wetlands-treating-ibuprofen
#12
Liang Zhang, Tao Lyu, Yang Zhang, Mark Button, Carlos A Arias, Kela P Weber, Hans Brix, Pedro N Carvalho
Microbial degradation is an important pathway during the removal of pharmaceuticals in constructed wetlands (CWs). However, the effects of CW design, plant presence, and different plant species on the microbial community in CWs have not been fully explored. This study aims to investigate the microbial community metabolic function of different types of CWs used to treat ibuprofen via community-level physiological profiling (CLPP) analysis. We studied the interactions between three CW designs (unsaturated, saturated and aerated) and six types of mesocosms (one unplanted and five planted, with Juncus, Typha, Berula, Phragmites and Iris) treating synthetic wastewater...
December 23, 2017: Water Research
https://www.readbyqxmd.com/read/29288453/serial-dilution-based-growth-curves-and-growth-curve-synchronization-for-high-resolution-time-series-of-bacterial-biofilm-growth
#13
Fernando Govantes
The ability to form stable surface-attached communities called biofilms is of paramount importance to both beneficial and harmful interactions between microbes and microbial, plant or animal partners. Assessment of biofilm formation ability is often performed by growing the organisms in microtiter plate wells and staining the well-attached material, a method whose use for time-course analysis is limited by its destructive nature. Here we combine a serial dilution-based biofilm growth curve method with online monitoring of planktonic growth and a serially diluted growth curve synchronization algorithm to reconstruct the time-course of planktonic and biofilm growth...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29250789/plant-microbe-interactions-organelles-and-the-cytoskeleton-in-action
#14
REVIEW
Eunsook Park, Alexander Nedo, Jeffrey L Caplan, Savithramma P Dinesh-Kumar
Contents Summary I. II. III. IV. V. VI. References SUMMARY: Plants have evolved a multilayered immune system with well-orchestrated defense strategies against pathogen attack. Multiple immune signaling pathways, coordinated by several subcellular compartments and interactions between these compartments, play important roles in a successful immune response. Pathogens use various strategies to either directly attack the plant's immune system or to indirectly manipulate the physiological status of the plant to inhibit an immune response...
December 18, 2017: New Phytologist
https://www.readbyqxmd.com/read/29238751/tree-leaf-bacterial-community-structure-and-diversity-differ-along-a-gradient-of-urban-intensity
#15
Isabelle Laforest-Lapointe, Christian Messier, Steven W Kembel
Tree leaf-associated microbiota have been studied in natural ecosystems but less so in urban settings, where anthropogenic pressures on trees could impact microbial communities and modify their interaction with their hosts. Additionally, trees act as vectors spreading bacterial cells in the air in urban environments due to the density of microbial cells on aerial plant surfaces. Characterizing tree leaf bacterial communities along an urban gradient is thus key to understand the impact of anthropogenic pressures on urban tree-bacterium interactions and on the overall urban microbiome...
November 2017: MSystems
https://www.readbyqxmd.com/read/29234354/differential-microbial-diversity-in-drosophila-melanogaster-are-fruit-flies-potential-vectors-of-opportunistic-pathogens
#16
Luis A Ramírez-Camejo, Génesis Maldonado-Morales, Paul Bayman
Drosophila melanogaster has become a model system to study interactions between innate immunity and microbial pathogens, yet many aspects regarding its microbial community and interactions with pathogens remain unclear. In this study wild D. melanogaster were collected from tropical fruits in Puerto Rico to test how the microbiota is distributed and to compare the culturable diversity of fungi and bacteria. Additionally, we investigated whether flies are potential vectors of human and plant pathogens. Eighteen species of fungi and twelve species of bacteria were isolated from wild flies...
2017: International Journal of Microbiology
https://www.readbyqxmd.com/read/29234343/effects-of-plant-functional-group-loss-on-soil-microbial-community-and-litter-decomposition-in-a-steppe-vegetation
#17
Chunwang Xiao, Yong Zhou, Jiaqi Su, Fan Yang
Globally, many terrestrial ecosystems are experiencing a rapid loss of biodiversity. Continued improvements in our understanding of interrelationships between plant diversity and soil microbes are critical to address the concern over the consequences of the decline in biodiversity on ecosystem functioning and services. By removing forbs, or grasses, or, to an extreme scenario, both forbs and grasses in a steppe vegetation in Inner Mongolia, we studied how plant functional group (PFG) loss affects soil microbial community composition using phospholipid fatty acid analysis (PLFA) and litter decomposition using a litter-bag method...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29232589/peptides-having-antimicrobial-activity-and-their-complexes-with-transition-metal-ions
#18
REVIEW
Małgorzata Jeżowska-Bojczuk, Kamila Stokowa-Sołtys
Peptide antibiotics are produced by bacterial, mammalian, insect or plant organisms in defense against invasive microbial pathogens. Therefore, they are gaining importance as anti-infective agents. There are a number of antibiotics that require metal ions to function properly. Metal ions play a key role in their action and are involved in specific interactions with proteins, nucleic acids and other biomolecules. On the other hand, it is well known that some antimicrobial agents possess functional groups that enable them interacting with metal ions present in physiological fluids...
December 2, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29226306/symbioses-with-nitrogen-fixing-bacteria-nodulation-and-phylogenetic-data-across-legume-genera
#19
Michelle E Afkhami, D Luke Mahler, Jean H Burns, Marjorie G Weber, Martin F Wojciechowski, Janet Sprent, Sharon Y Strauss
How species interactions shape global biodiversity and influence diversification is a central - but also data-hungry - question in evolutionary ecology. Microbially-based mutualisms are widespread and could cause diversification by ameliorating stress and thus allowing organisms to colonize and adapt to otherwise unsuitable habitats. Yet the role of these interactions in generating species diversity has received limited attention, especially across large taxonomic groups. In the massive angiosperm family Leguminosae, plants often associate with root-nodulating bacteria that ameliorate nutrient stress by fixing atmospheric nitrogen...
December 11, 2017: Ecology
https://www.readbyqxmd.com/read/29218336/chemical-signaling-involved-in-plant-microbe-interactions
#20
REVIEW
Fernanda Oliveira Chagas, Rita de Cassia Pessotti, Andrés Mauricio Caraballo-Rodríguez, Mônica Tallarico Pupo
Microorganisms are found everywhere, and they are closely associated with plants. Because the establishment of any plant-microbe association involves chemical communication, understanding crosstalk processes is fundamental to defining the type of relationship. Although several metabolites from plants and microbes have been fully characterized, their roles in the chemical interplay between these partners are not well understood in most cases, and they require further investigation. In this review, we describe different plant-microbe associations from colonization to microbial establishment processes in plants along with future prospects, including agricultural benefits...
December 8, 2017: Chemical Society Reviews
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