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Microbiological Research

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https://www.readbyqxmd.com/read/28285663/an-lrr-receptor-kinase-regulates-growth-development-and-pathogenesis-in-phytophthora-capsici
#1
Asma Safdar, Qi Li, Danyu Shen, Linlin Chen, Feng He, Rongbo Wang, Meixiang Zhang, Joseph Juma Mafurah, Sajid Aleem Khan, Daolong Dou
Leucine-rich repeats (LRRs) domain containing kinase proteins (LRR-RK) perform various functions in eukaryotic organisms. However, their functions in Oomycetes are still largely unknown. Here, we identified an LRR-RK (PcLRR-RK1) gene and characterized its functions in Phytophthora capsici, a model oomycete specie and a major plant destroyer of solanaceous and cucurbitaceous vegetable crops. We showed that PcLRR-RK1-silenced P. capsici transformants exhibited reduced growth and produced highly branched fluffy hyphae...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285662/corrigendum-to-cellulolytic-potential-of-probiotic-bacillus-subtilis-ams6-isolated-from-traditional-fermented-soybean-churpi-an-in-vitro-study-with-regards-to-application-as-an-animal-feed-additive-microbiol-res-186-187-2016-62-70
#2
Ajay K Manhar, Yasir Bashir, Devabrata Saikia, Dhrubajyoti Nath, Kuldeep Gupta, Bolin K Konwar, Rahul Kumar, Nima D Namsa, Manabendra Mandal
No abstract text is available yet for this article.
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285661/colonization-and-beneficial-effects-on-annual-ryegrass-by-mixed-inoculation-with-plant-growth-promoting-bacteria
#3
Nádia L Castanheira, Ana Catarina Dourado, Isabel Pais, José Semedo, Paula Scotti-Campos, Nuno Borges, Gilda Carvalho, Maria Teresa Barreto Crespo, Paula Fareleira
Multi-strain inoculants have increased potential to accomplish a diversity of plant needs, mainly attributed to its multi-functionality. This work evaluated the ability of a mixture of three bacteria to colonize and induce a beneficial response on the pasture crop annual ryegrass. Pseudomonas G1Dc10 and Paenibacillus G3Ac9 were previously isolated from annual ryegrass and were selected for their ability to perform multiple functions related to plant growth promotion. Sphingomonas azotifigens DSMZ 18530(T) was included due to nitrogen fixing ability...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285660/genetic-and-biochemical-characterization-of-hyicin-3682-the-first-bacteriocin-reported-for-staphylococcus-hyicus
#4
Patrícia Carlin Fagundes, Ilana Nascimento de Sousa Santos, Márcia Silva Francisco, Rodolpho Mattos Albano, Maria do Carmo de Freire Bastos
Hyicin 3682, the first bacteriocin reported for Staphylococcus hyicus, is a BsaCOL variant produced by S. hyicus 3682, a strain isolated from bovine milk. Hyicin 3682 is found in the culture supernatant, is bactericidal and its producing strain exhibits a much broader spectrum of antimicrobial activity than the producing strain of BsaCOL against several Gram-positive bacteria, which include foodborne pathogens, food-spoilage microorganisms and bacterial species of medical and veterinary importance. Sequencing of the genome of S...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285659/candida-albicans-infection-and-intestinal-immunity
#5
REVIEW
Yiqing Tong, Jianguo Tang
Fungal infections cause high rates of morbidity and mortality in intensive care and immunocompromised patients, and can represent a life-threatening disease. As a microorganism commonly found in the intestine, Candida albicans (C. albicans) can invade the gut epithelium barrier via microfold cells and enter the bloodstream. The defensive potential of the intestinal barrier against invasive C. albicans is dependent on innate and adaptive immune responses which enable the host to eliminate pathogenic fungi. The lamina propria layer of the intestine contains numerous immune cells capable of inducing an innate cellular immune response against invasive fungi...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285658/competition-assays-revealed-paenibacillus-pasadenensis-strain-r16-as-a-novel-antifungal-agent
#6
Alessandro Passera, Giovanni Venturini, Giovanna Battelli, Paola Casati, Francesca Penaca, Fabio Quaglino, Piero Attilio Bianco
The development of new sustainable containment strategies of plant diseases is very important to guarantee food security while reducing the environmental impact of agriculture. Research of new biocontrol agents is a long and difficult process that involves several steps that start from the identification of possible candidates which, for example, show antibiotic activities, and ends with in field, large scale trials. In this study, the plant growth promoting potential and antifungal effect exerted by a novel, putative candidate biocontrol agent, strain R16, identified as Paenibacillus pasadenensis by sequence analysis of 16S rRNA and rpoB genes, against three important plant pathogenic fungi (Botrytis cinerea, Fusarium verticillioides, and Phomopsis viticola), were assessed...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28285657/two-component-regulatory-system-acts-actr-is-required-for-sinorhizobium-meliloti-adaptation-to-oxidative-stress
#7
Guirong Tang, Sunjun Wang, Dawei Lu, Leqi Huang, Ningning Li, Li Luo
The two-component system ActS/ActR plays important roles in bacterial adaptation to abiotic stress, including acid tolerance and oxidant resistance. However, the underlying regulatory mechanism is not clear. In this study, we found that the ActS/ActR system is required for adaptation to oxidative stress by regulating the transcription of the genes actR, katB, gshA and gshB1. The actS and actR mutants were sensitive to low pH and oxidants such as H2O2, oxidized glutathione (GSSG) and sodium nitroprusside (SNP)...
May 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219529/challenges-and-prospects-of-xylitol-production-with-whole-cell-bio-catalysis-a-review
#8
REVIEW
Diptarka Dasgupta, Sheetal Bandhu, Dilip K Adhikari, Debashish Ghosh
Xylitol, as an alternative low calorie sweetener is well accepted in formulations of various confectioneries and healthcare products. Worldwide it is industrially produced by catalytic hydrogenation of pure d-xylose solution under high temperature and pressure. Biotechnological xylitol production is a potentially attractive replacement for chemical process, as it occurs under much milder process conditions and can be based on sugar mixtures derived from low-cost industrial and agri-waste. However, microbial fermentation route of xylitol production is not so far practiced industrially...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219528/mycobacterium-tuberculosis-rv1987-induces-th2-immune-responses-and-enhances-mycobacterium-smegmatis-survival-in-mice
#9
Shanshan Sha, Xiaoxia Shi, Guoying Deng, Lina Chen, Yi Xin, Yufang Ma
Mycobacterium tuberculosis can interfere with host immune response and escape clearance through its specific antigens. M. tuberculosis Rv1987 encoded by region of difference (RD)-2 gene is a secretory protein with immunogenic potency. Here, we investigated the impact of Rv1987 on host cytokine responses and T cell polarization in mouse aerosol model. A recombinant M. smegmatis mc(2)155 strain that overexpressed Rv1987 protein (named MS1987) was constructed and used to infect C57BL/6 mice. The mc(2)155 harbored the empty vector (named MSVec) was as a control...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219527/induced-systemic-resistance-and-symbiotic-performance-of-peanut-plants-challenged-with-fungal-pathogens-and-co-inoculated-with-the-biocontrol-agent-bacillus-sp-chep5-and-bradyrhizobium-sp-semia6144
#10
María Soledad Figueredo, María Laura Tonelli, Fernando Ibáñez, Federico Morla, Guillermo Cerioni, María Del Carmen Tordable, Adriana Fabra
Synergism between beneficial rhizobacteria and fungal pathogens is poorly understood. Therefore, evaluation of co-inoculation of bacteria that promote plant growth by different mechanisms in pathogen challenged plants would contribute to increase the knowledge about how plants manage interactions with different microorganisms. The goals of this work were a) to elucidate, in greenhouse experiments, the effect of co-inoculation of peanut with Bradyrhizobium sp. SEMIA6144 and the biocontrol agent Bacillus sp. CHEP5 on growth and symbiotic performance of Sclerotium rolfsii challenged plants, and b) to evaluate field performance of these bacteria in co-inoculated peanut plants...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219526/antifungal-activity-of-ionic-liquids-based-on-menthol-a-mechanism-study
#11
Jakub Suchodolski, Joanna Feder-Kubis, Anna Krasowska
The mechanism of toxicity of chiral ionic liquids with (1R,2S,5R)-(-)-menthol [Cn-Am-Men][Cl] (n=10, 11 or 12) in the fungus Candida albicans is reported here. Ionic liquids were more toxic towards Candida strain lacking all identified multidrug resistance efflux pumps. Moreover, the compounds tested inhibited C. albicans filamentation at the concentration at which detached fungal cells also adhered to the plastic surface. Our results showed the high activity of all the tested chiral ionic liquids in the permeabilization of C...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219525/acclimation-strategy-of-rhodopseudomonas-palustris-to-high-light-irradiance
#12
Dayana Muzziotti, Alessandra Adessi, Cecilia Faraloni, Giuseppe Torzillo, Roberto De Philippis
The ability of Rhodopseudomonas palustris cells to rapidly acclimate to high light irradiance is an essential issue when cells are grown under sunlight. The aim of this study was to investigate the photo-acclimation process in Rhodopseudomonas palustris 42OL under different culturing conditions: (i) anaerobic (AnG), (ii) aerobic (AG), and (iii) under H2-producing (HP) conditions both at low (LL) and high light (HL) irradiances. The results obtained clearly showed that the photosynthetic unit was significantly affected by the light irradiance at which Rp...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219524/the-function-and-transcriptome-analysis-of-a-bzip-transcription-factor-cgap1-in-colletotrichum-gloeosporioides
#13
Xiaoyu Li, Yateng Wu, Zhiqiang Liu, Chenghui Zhang
Colletotrichum gloeosporioides is an important pathogen of anthracnose, which is able to infect numerous crops in tropical and subtropical regions, causing great economic losses. To investigate the fungal response to host-generated reactive oxygen species (ROS), we cloned and characterized the CgAP1 gene of C. gloeosporioides. CgAP1 encoded a bZIP transcription factor which had a bZIP DNA-binding domain and two cysteine-rich domains structurally and functionally related to Saccharomyces cerevisiae YAP1. Deletion of CgAP1 in C...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219523/combinatorial-effect-of-mutagenesis-and-medium-component-optimization-on-bacillus-amyloliquefaciens-antifungal-activity-and-efficacy-in-eradicating-botrytis-cinerea
#14
Fatma Masmoudi, Saoussen Ben Khedher, Amel Kamoun, Nabil Zouari, Slim Tounsi, Mohamed Trigui
This work is directed towards Bacillus amyloliquefaciens strain BLB371 metabolite production for biocontrol of fungal phytopathogens. In order to maximise antifungal metabolite production by this strain, two approaches were combined: random mutagenesis and medium component optimization. After three rounds of mutagenesis, a hyper active mutant, named M3-7, was obtained. It produces 7 fold more antifungal metabolites (1800AU/mL) than the wild strain in MC medium. A hybrid design was applied to optimise a new medium to enhance antifungal metabolite production by M3-7...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219522/molecular-assessment-of-the-bacterial-community-associated-with-cassava-manihot-esculenta-crantz-cultivation-in-cameroon
#15
Papa Saliou Sarr, Akifumi Sugiyama, Aime Didier Boyogueno Begoude, Kazufumi Yazaki, Shigeru Araki, Eiji Nawata
Bacterial communities play an important role in nutrient cycles and plant development. Their distribution and activity may depend on location and environmental heterogeneity. This study characterized soil bacterial communities in cassava fields of Eastern (Andom) and Southern (Bityili) Cameroon using molecular tools. In both sites, two improved varieties (TMS-96/1414; TMS-92/0326) and a local variety (Local) were grown in a randomized block design. Composite bulk soils were collected at 10months after planting from cassava plots...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28219521/butyrate-influences-intracellular-levels-of-adenine-and-adenine-derivatives-in-the-fungus-penicillium-restrictum
#16
Christoph Zutz, Yi Ming Chiang, Bettina Faehnrich, Markus Bacher, Roland Hellinger, Bernhard Kluger, Martin Wagner, Joseph Strauss, Kathrin Rychli
Butyrate, a small fatty acid, has an important role in the colon of ruminants and mammalians including the inhibition of inflammation and the regulation of cell proliferation. There is also growing evidence that butyrate is influencing the histone structure in mammalian cells by inhibition of histone deacetylation. Butyrate shows furthermore an antimicrobial activity against fungi, yeast and bacteria, which is linked to its toxicity at a high concentration. In fungi there are indications that butyrate induces the production of secondary metabolites potentially via inhibition of histone deacetylases...
April 2017: Microbiological Research
https://www.readbyqxmd.com/read/28164795/comparative-genomic-analysis-of-the-genus-enterococcus
#17
Zhi Zhong, Wenyi Zhang, Yuqin Song, Wenjun Liu, Haiyan Xu, Xiaoxia Xi, Bilige Menghe, Heping Zhang, Zhihong Sun
As important lactic acid bacteria, Enterococcus species are widely used in the production of fermented food. However, as some strains of Enterococcus are opportunistic pathogens, their safety has not been generally accepted. In recent years, a large number of new species have been described and classified within the genus Enterococcus, so a better understanding of the genetic relationships and evolution of Enterococcus species is needed. In this study, the genomes of 29 type strains of Enterococcus species were sequenced...
March 2017: Microbiological Research
https://www.readbyqxmd.com/read/28164794/genomic-and-metabolic-traits-endow-bacillus-velezensis-cc09-with-a-potential-biocontrol-agent-in-control-of-wheat-powdery-mildew-disease
#18
Xun-Chao Cai, Chang-Hong Liu, Bao-Tong Wang, Ya-Rong Xue
Bacillus velezensis CC09, which was isolated from healthy leaves of Cinnamomum camphora and previously identified as Bacillus amyloliquefaciens CC09, shows great potential as a new biocontrol agent, in control of many phytopathogenic diseases. To extend our understanding of the potential antifungal capacities, we did a whole genome analysis of strain CC09. Result shows that strain CC09 has a relatively large genome size (4.17Mb) with an average GC content of 46.1%, and 4021 predicted genes. Thirteen secondary metabolites encoding clusters have been identified within the genome of B...
March 2017: Microbiological Research
https://www.readbyqxmd.com/read/28164793/small-rnas-regulate-the-biocontrol-property-of-fluorescent-pseudomonas-strain-psd
#19
Anamika Upadhyay, Mandira Kochar, Ashutosh Upadhyay, Soumya Tripathy, Manchikatla Venkat Rajam, Sheela Srivastava
The production of biocontrol factors by Pseudomonads is reported to be controlled at the post-transcriptional level by the GacS/GacA signal transduction pathway. This involves RNA-binding translational repressor proteins, RsmA and RsmE, and the small regulatory RNAs (sRNAs) RsmX, RsmY, and RsmZ. While the former represses genes involved in secondary metabolite production, the latter relieves this repression at the end of exponential growth. We have studied the fluorescent Pseudomonas strain Psd, possessing good biocontrol potential, and confirmed the presence of rsmY and rsmZ by PCR amplification...
March 2017: Microbiological Research
https://www.readbyqxmd.com/read/28164792/characterization-and-function-of-mycobacterium-tuberculosis-h37rv-lipase-rv1076-lipu
#20
Chunyan Li, Qiming Li, Yuan Zhang, Zhen Gong, Sai Ren, Ping Li, Jianping Xie
Lipids and lipases/esterases are essential for Mycobacterium tuberculosis (Mtb) survival and persistence, even virulence. Mycobacterium tuberculosis H37Rv Rv1076 (LipU), a member of lipase family, is homologous to the human Hormone Sensitive Lipase (HSL) based on the presence of conserved motif 'GXSXG'. To define the enzymatic characteristics of rv1076, the gene was cloned, and expressed in Escherichia coli. The protein was purified for enzymatic characterization. LipU showed high specific activity for the hydrolysis of short carbon chain substrates with optimal activity at 40°C/pH 8...
March 2017: Microbiological Research
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