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https://www.readbyqxmd.com/read/28944027/symbiosis-constraints-strong-mycobiont-control-limits-nutrient-response-in-lichens
#1
Kristin Palmqvist, Oskar Franklin, Torgny Näsholm
Symbioses such as lichens are potentially threatened by drastic environmental changes. We used the lichen Peltigera aphthosa-a symbiosis between a fungus (mycobiont), a green alga (Coccomyxa sp.), and N2-fixing cyanobacteria (Nostoc sp.)-as a model organism to assess the effects of environmental perturbations in nitrogen (N) or phosphorus (P). Growth, carbon (C) and N stable isotopes, CNP concentrations, and specific markers were analyzed in whole thalli and the partners after 4 months of daily nutrient additions in the field...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28943874/a-genome-wide-prediction-and-identification-of-intergenic-small-rnas-by-comparative-analysis-in-mesorhizobium-huakuii-7653r
#2
Xie Fuli, Zhao Wenlong, Wang Xiao, Zhang Jing, Hao Baohai, Zou Zhengzheng, Ma Bin-Guang, Li Youguo
In bacteria, small non-coding RNAs (sRNAs) are critical regulators of cellular adaptation to changes in metabolism, physiology, or the external environment. In the last decade, more than 2000 of sRNA families have been reported in the Rfam database and have been shown to exert various regulatory functions in bacterial transcription and translation. However, little is known about sRNAs and their functions in Mesorhizobium. Here, we predicted putative sRNAs in the intergenic regions (IGRs) of M. huakuii 7653R by genome-wide comparisons with four related Mesorhizobial strains...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28942037/involvement-of-caspase3-in-the-acute-stress-response-to-high-temperature-and-elevated-ammonium-in-stony-coral-pocillopora-damicornis
#3
Xiaopeng Yu, Bo Huang, Zhi Zhou, Jia Tang, Yang Yu
Apoptosis is orchestrated by a family of cysteine proteases known as the caspases, and caspase3 is the primary executioner caspase in the apoptosis. In the present study, the potential role of caspase3 was investigated under the exposure to high temperature and elevated ammonium in stony coral Pocillopora damicornis. The cDNA of a caspase3 (PdCaspase3) was identified to encode a polypeptide of 344 amino acids, and the encoded protein contained one CASc domain (Caspase, interleukin-1 beta converting enzyme homologues, from Val76 to Asn333)...
September 20, 2017: Gene
https://www.readbyqxmd.com/read/28939987/dual-bacterial-fungal-symbiosis-in-deltocephalinae-leafhoppers-insecta-hemiptera-cicadomorpha-cicadellidae
#4
Michał Kobiałka, Anna Michalik, Marcin Walczak, Teresa Szklarzewicz
The symbiotic systems (types of symbionts, their distribution in the host insect body, and their transovarial transmission between generations) of four Deltocephalinae leafhoppers: Fieberiella septentrionalis, Graphocraerus ventralis, Orientus ishidae, and Cicadula quadrinotata have been examined by means of histological, ultrastructural, and molecular techniques. In all four species, two types of symbionts are present: bacterium Sulcia (phylum Bacteroidetes) and yeast-like symbionts closely related to the entomopathogenic fungi (phylum Ascomycota, class Sordariomycetes)...
September 23, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28937817/sanctions-partner-recognition-and-variation-in-mutualism
#5
Jeremy B Yoder, Peter Tiffin
Mutualistic interactions can be stabilized against invasion by noncooperative individuals by putting such "cheaters" at a selective disadvantage. Selection against cheaters should eliminate genetic variation in partner quality-yet such variation is often found in natural populations. One explanation for this paradox is that mutualism outcomes are determined not only by responses to partner performance but also by partner signals. Here, we build a model of coevolution in a symbiotic mutualism, in which hosts' ability to sanction noncooperative symbionts and recognition of symbiont signals are determined by separate loci, as are symbionts' cooperation and expression of signals...
October 2017: American Naturalist
https://www.readbyqxmd.com/read/28936222/the-soybean-rfg1-gene-restricts-nodulation-by-sinorhizobium-fredii-usda193
#6
Yinglun Fan, Jinge Liu, Shanhua Lyu, Qi Wang, Shengming Yang, Hongyan Zhu
Sinorhizobium fredii is a fast-growing rhizobial species that can establish a nitrogen-fixing symbiosis with a wide range of legume species including soybeans (Glycine max). In soybeans, this interaction shows a high level of specificity such that particular S. fredii strains nodulate only a limited set of plant genotypes. Here we report the identification of a dominant gene in soybeans that restricts nodulation with S. fredii USDA193. Genetic mapping in an F2 population revealed co-segregation of the underlying locus with the previously cloned Rfg1 gene...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28934375/into-the-wild-parallel-transcriptomics-of-the-tsetse-wigglesworthia-mutualism-within-kenyan-populations
#7
Miguel Medina Munoz, Adam R Pollio, Hunter L White, Rita V M Rio
Tsetse flies (Diptera: Glossinidae) have medical significance as the obligate vectors of African trypanosomes. In addition, tsetse harbor a simple gut microbiota. A predominant gut microbiota member, the Gammaproteobacterium Wigglesworthia spp., has coevolved with tsetse for a significant portion of Glossina radiation proving critical to tsetse fitness. Although multiple roles have been described for Wigglesworthia within colony flies, little research has been dedicated towards functional characterization within wild tsetse...
September 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28931020/a-new-species-of-hermit-crab-diogenes-heteropsammicola-crustacea-decapoda-anomura-diogenidae-replaces-a-mutualistic-sipunculan-in-a-walking-coral-symbiosis
#8
Momoko Igawa, Makoto Kato
Symbiont shift is rare in obligate mutualisms because both the partners are reciprocally dependent on and specialized to each other. In the obligate accommodation-transportation mutualism between walking corals and sipunculans, however, an unusual saltatory symbiont shift was discovered. In shallow waters of southern Japan, an undescribed hermit crab species was found living in corallums of solitary scleractinian corals of the genera Heterocyathus and Heteropsammia, replacing the usual sipunculan symbiont. We described the hermit crab as a new species Diogenes heteropsammicola (Decapoda, Anomura, Diogenidae), and explored its association with the walking corals...
2017: PloS One
https://www.readbyqxmd.com/read/28929800/microcosm-investigation-of-growth-and-phytoremediation-potential-of-azolla-japonica-along-nitrogen-gradients
#9
Hun Park, Uhram Song
Although Azolla species are among the most promising plants for use in phytoremediation, more studies on their growth and nitrogen (N) uptake along the N gradients of growing media are required. In this study, N concentration-dependent growth in growing media and phosphorus (P) and N accumulation by Azolla japonica were studied by estimating direct N uptake from media by molybdenum-iron proteins. The doubling time of A. japonica was less than a week, regardless of the N concentration (0, 5, and 25 mg N/L) present in the growth media, indicating that this plant is suitable for remediation...
October 3, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28923004/regulatory-networks-underlying-mycorrhizal-development-delineated-by-genome-wide-expression-profiling-and-functional-analysis-of-the-transcription-factor-repertoire-of-the-plant-symbiotic-fungus-laccaria-bicolor
#10
Y Daguerre, E Levati, J Ruytinx, E Tisserant, E Morin, A Kohler, B Montanini, S Ottonello, A Brun, C Veneault-Fourrey, F Martin
BACKGROUND: Ectomycorrhizal (ECM) fungi develop a mutualistic symbiotic interaction with the roots of their host plants. During this process, they undergo a series of developmental transitions from the running hyphae in the rhizosphere to the coenocytic hyphae forming finger-like structures within the root apoplastic space. These transitions, which involve profound, symbiosis-associated metabolic changes, also entail a substantial transcriptome reprogramming with coordinated waves of differentially expressed genes...
September 18, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28922610/symbiosis-of-selected-rhizobium-leguminosarum-bv-viciae-strains-with-diverse-pea-genotypes-effects-on-biological-nitrogen-fixation
#11
Chao Yang, Rosalind Bueckert, Jeff Schoenau, Axel Diederichsen, Hossein Zakeri, Thomas Warkentin
Biological nitrogen fixation (BNF) can be improved by optimizing the interaction between the rhizobial inoculant and pea (Pisum sativum L.), leading to increased productivity and reduced nitrogen (N) fertilizer use. Eight Rhizobium leguminosarum bv. viciae strains were used to inoculate super-nodulating pea mutant Rondo-nod3(fix+), hyper-nodulating pea mutant Frisson P88 Sym29, CDC Meadow commercial control, and a non-nodulating mutant Frisson P56 (nod-) to evaluate BNF in a greenhouse assay. Significant differences in strain×cultivar interactions were detected for shoot and root dry weight which ranged from 1...
September 18, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28921846/improvement-of-polytrauma-management-quality-inspection-of-a-newly-introduced-course-concept
#12
Ingo Gräff, Shahab Ghamari, Sylvia Schacher, Procula Glien, Rolf Fimmers, Torsten Baehner, Se-Chan Kim
RATIONALE, AIMS, AND OBJECTIVES: A systematic literature search for training course concepts for care of severely injured and severely ill patients respecting improvement of process and outcome yielded little data. For several years, the University Hospital of Bonn has hosted a shock-room management course which, on the one hand, communicates human factor aspects and, on the other hand, pursues interdisciplinary and interprofessional team training. The Bonn shock-room management course (BSM-course®) differs from other courses in both format and principles...
September 17, 2017: Journal of Evaluation in Clinical Practice
https://www.readbyqxmd.com/read/28921808/long-term-agricultural-management-does-not-alter-the-evolution-of-a-soybean-rhizobium-mutualism
#13
Jennifer E Schmidt, Dylan J Weese, Jennifer A Lau
Leguminous crops, like soybeans, often rely on biologically fixed nitrogen via their symbiosis with rhizobia rather than synthetic nitrogen inputs. However, agricultural management practices may influence the effectiveness of biological nitrogen fixation. While the ecological effects of agricultural management on rhizobia have received some attention, the evolutionary effects have been neglected in comparison. Resource mutualism theory predicts that evolutionary effects are likely, however. Both fertilization and tillage are predicted to cause the evolution of rhizobia that provide fewer growth benefits to plant hosts and fix less nitrogen...
September 16, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28919923/revealing-topics-and-their-evolution-in-biomedical-literature-using-bio-dtm-a-case-study-of-ginseng
#14
Qian Chen, Ni Ai, Jie Liao, Xin Shao, Yufeng Liu, Xiaohui Fan
BACKGROUND: Valuable scientific results on biomedicine are very rich, but they are widely scattered in the literature. Topic modeling enables researchers to discover themes from an unstructured collection of documents without any prior annotations or labels. In this paper, taking ginseng as an example, biological dynamic topic model (Bio-DTM) was proposed to conduct a retrospective study and interpret the temporal evolution of the research of ginseng. METHODS: The system of Bio-DTM mainly includes four components, documents pre-processing, bio-dictionary construction, dynamic topic models, topics analysis and visualization...
2017: Chinese Medicine
https://www.readbyqxmd.com/read/28916813/genome-sequencing-reveals-metabolic-and-cellular-interdependence-in-an-amoeba-kinetoplastid-symbiosis
#15
Goro Tanifuji, Ugo Cenci, Daniel Moog, Samuel Dean, Takuro Nakayama, Vojtěch David, Ivan Fiala, Bruce A Curtis, Shannon J Sibbald, Naoko T Onodera, Morgan Colp, Pavel Flegontov, Jessica Johnson-MacKinnon, Michael McPhee, Yuji Inagaki, Tetsuo Hashimoto, Steven Kelly, Keith Gull, Julius Lukeš, John M Archibald
Endosymbiotic relationships between eukaryotic and prokaryotic cells are common in nature. Endosymbioses between two eukaryotes are also known; cyanobacterium-derived plastids have spread horizontally when one eukaryote assimilated another. A unique instance of a non-photosynthetic, eukaryotic endosymbiont involves members of the genus Paramoeba, amoebozoans that infect marine animals such as farmed fish and sea urchins. Paramoeba species harbor endosymbionts belonging to the Kinetoplastea, a diverse group of flagellate protists including some that cause devastating diseases...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28916558/potential-of-rice-stubble-as-a-reservoir-of-bradyrhizobial-inoculum-in-rice-legume-crop-rotation
#16
Pongdet Piromyou, Teerana Greetatorn, Kamonluck Teamtisong, Panlada Tittabutr, Nantakorn Boonkerd, Neung Teaumroong
Bradyrhizobium encompasses a variety of bacteria that can live in symbiotic and endophytic associations with leguminous and non-leguminous plants such as rice. Therefore, it can be expected that rice endophytic bradyrhizobia can be applied in the rice-legume crop rotation system. Some endophytic bradyrhizobial strains were isolated from rice (Oryza sativa L.) tissues. The rice biomass could be enhanced when supplying KNO3, NH4NO3, or urea with bradyrhizobial strain inoculation, especially strain SUTN9-2. In contrast, the strains which suppressed rice growth were photosynthetic bradyrhizobia and also found to produce nitric oxide (NO) in the rice root...
September 15, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28910702/respiratory-atp-cost-and-benefit-of-arbuscular-mycorrhizal-symbiosis-with-nicotiana-tabacum-at-different-growth-stages-and-under-salinity
#17
Néstor Fernández Del-Saz, Antonia Romero-Munar, David Alonso, Ricardo Aroca, Elena Baraza, Jaume Flexas, Miquel Ribas-Carbo
Growth and maintenance partly depend on both respiration and ATP production during oxidative phosphorylation in leaves. Under stress, ATP is needed to maintain the accumulated biomass. ATP production mostly proceeds from the cytochrome oxidase pathway (COP), while respiration via the alternative oxidase pathway (AOP) may decrease the production of ATP per oxygen consumed, especially under phosphorus (P) limitation and salinity conditions. Symbiosis with arbuscular mycorrhizal (AM) fungi is reputed by their positive effect on plant growth under stress at mature stages of colonization; however, fungal colonization may decrease plant growth at early stages...
September 7, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28905167/molecular-diversity-and-phylogeny-of-indigenous-rhizobium-leguminosarum-strains-associated-with-trifolium-repens-plants-in-romania
#18
Rodica C Efrose, Craita M Rosu, Catalina Stedel, Andrei Stefan, Culita Sirbu, Lucian D Gorgan, Nikolaos E Labrou, Emmanouil Flemetakis
The symbiotic nitrogen fixing legumes play an essential role in sustainable agriculture. White clover (Trifolium repens L.) is one of the most valuable perennial legumes in pastures and meadows of temperate regions. Despite its great agriculture and economic importance, there is no detailed available information on phylogenetic assignation and characterization of rhizobia associated with native white clover plants in South-Eastern Europe. In the present work, the diversity of indigenous white clover rhizobia originating in 11 different natural ecosystems in North-Eastern Romania were assessed by a polyphasic approach...
September 13, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28903461/comparative-genomics-reveals-two-major-bouts-of-gene-retroposition-coinciding-with-crucial-periods-of-symbiodinium-evolution
#19
Bo Song, David Morse, Yue Song, Yuan Fu, Xin Lin, Wenliang Wang, Shifeng Cheng, Wenbin Chen, Xin Liu, Senjie Lin
Gene retroposition is an important mechanism of genome evolution but the role it plays in dinoflagellates, a critical player in marine ecosystems, is not known. Until recently, when the genomes of two coral-symbiotic dinoflagellate genomes, Symbiodinium kawagutii and S. minutum, were released, it has not been possible to systematically study these retrogenes. Here we examine the abundant retrogenes (∼23% of the total genes) in these species. The hallmark of retrogenes in the genome is the presence of DCCGTAGCCATTTTGGCTCAAG, a spliced leader (DinoSL) constitutively trans-spliced to the 5'-end of all nucleus-encoded mRNAs...
August 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28900232/three-novel-structural-phenomena-in-the-cellular-ontogeny-of-oenococcus-oeni-from-northern-china
#20
Yun Wang, Shuwen Liu, Jing Su, Yu Zhang, Jing Li, Yin-Qiang Sui, Ying-Ying Li, Hua Wang, Hua Li
Stress resistance and growth are important aspects to consider when engineering Oenococcus oeni strains for winemaking. We identified 3 previously unreported structural phenomena in the cell ontogeny of O. oeni sampled in northern China. We show that budding and binary fission (BBF) occur simultaneously in the growth process; that a novel 'pomegranate-shaped structure' (PSS) occurs mainly in the stationary and death phases; and that symbiosis and cyclical phenomena (SCP) occur throughout the various cell growth phases...
September 12, 2017: Scientific Reports
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