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Microbiological Research

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https://www.readbyqxmd.com/read/29853172/effectiveness-of-tailocins-produced-by-pseudomonas-fluorescens-sf4c-in-controlling-the-bacterial-spot-disease-in-tomatoes-caused-by-xanthomonas-vesicatoria
#1
Analía Príncipe, Maricruz Fernandez, Milenka Torasso, Agustina Godino, Sonia Fischer
The development of alternatives for the use of chemical pesticides for plant disease control is the present-day and ongoing challenge for achieving sustainable agriculture. Pseudomonas fluorescens SF4c, native strain from wheat, produces tailocins (phage-tail-like bacteriocins) with antimicrobial activity against several phytopathogenic strains. We thus investigated the efficacy of foliar application of these bacteriocins to control the bacterial-spot disease in tomato caused by Xanthomonas vesicatoria Xcv Bv5-4a...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853171/evidence-for-up-and-down-regulation-of-450-genes-by-rpob12-rif-mutation-and-their-implications-in-complexity-of-transcription-modulation-in-escherichia-coli
#2
Shanmugaraja Meenakshi, M Hussain Munavar
Analyses of mutations in rpoB subunit of Escherichia coli that lead to resistance to rifampicin have been invaluable in providing insight into events during transcription continue to be discovered. Earlier we reported that rpoB12 suppresses over-expression of cps genes in Δlon mutant of E. coli, by interfering with the transcription of rcsA. Here we report Microarray based Transcriptome profile of Δlon and Δlon rpoB12 strains. The data analyses clearly reveal that rpoB12 mutation results in the differential expression of ∼450 genes...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853170/signature-tagged-mutagenesis-screening-revealed-the-role-of-lipopolysaccharide-biosynthesis-gene-rfbh-in-smooth-to-rough-transition-in-salmonella-enteritidis
#3
Yang Jiao, Zemiao Xia, Xiaohui Zhou, Yaxin Guo, Rongxian Guo, Xilong Kang, Kaiyue Wu, Jun Sun, Xiulong Xu, Xinan Jiao, Zhiming Pan, Xiufan Liu
Salmonella enterica serovar Enteritidis (S. Enteritidis, SE) is a major cause of foodborne diseases for humans. The completeness of the O-chain antigen of Lipopolysaccharide (LPS) determines whether a S. Enteritidis strain is smooth or rough. However, genes that are involved in the synthesis of LPS and rough-smooth variation are not completely understood. In this study, we used monoclonal antibody against O-antigens (O9 mAb) to identify novel factors that are involved in LPS synthesis and rough variation in S...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853169/the-developmental-regulator-pcz1-affects-the-production-of-secondary-metabolites-in-the-filamentous-fungus-penicillium-roqueforti
#4
Juan F Rojas-Aedo, Carlos Gil-Durán, Alejandra Goity, Inmaculada Vaca, Gloria Levicán, Luis F Larrondo, Renato Chávez
Penicillium roqueforti is used in the production of several kinds of ripened blue-veined cheeses. In addition, this fungus produces interesting secondary metabolites such as roquefortine C, andrastin A and mycophenolic acid. To date, there is scarce information concerning the regulation of the production of these secondary metabolites. Recently, the gene named pcz1 (Penicillium C6 zinc domain protein 1) was described in P. roqueforti, which encodes for a Zn(II)2 Cys6 protein that controls growth and developmental processes in this fungus...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853168/master-mechanisms-of-staphylococcus-aureus-consider-its-excellent-protective-mechanisms-hindering-vaccine-development
#5
REVIEW
Xu Zhang, Manukumar H Marichannegowda, Kadalipura P Rakesh, Hua-Li Qin
Lack of known mechanisms of protection against Staphylococcus aureus in humans represents an important risk factor for skin infections and bacteremia in patients, intern hindering the development of efficacious vaccines. However, development of effective humoral response may be dampened by converging immune-evasion mechanisms of S. aureus. To develop a promising vaccine against S. aureus, it is pre-requisite to clear understanding of cutaneous, innate and adaptive immune response. The S. aureus dampening the humoral response, T cell help, blocking complement factors, and killing immune players by its toxins are the important factors need to understand clearly...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853167/biotechnological-applications-of-bacteriophages-state-of-the-art
#6
REVIEW
Liliam K Harada, Erica C Silva, Welida F Campos, Fernando S Del Fiol, Marta Vila, Krystyna Dąbrowska, Victor N Krylov, Victor M Balcão
Bacteriophage particles are the most abundant biological entities on our planet, infecting specific bacterial hosts in every known environment and being major drivers of bacterial adaptive evolution. The study of bacteriophage particles potentially sheds light on the development of new biotechnology products. Bacteriophage therapy, although not new, makes use of strictly lytic phage particles as an alternative in the antimicrobial treatment of resistant bacterial infections and is being rediscovered as a safe method due to the fact that these biological entities devoid of any metabolic machinery do not have affinity to eukaryotic cells...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853166/pathogenesis-related-proteins-and-peptides-as-promising-tools-for-engineering-plants-with-multiple-stress-tolerance
#7
REVIEW
Sajad Ali, Bashir Ahmad Ganai, Azra N Kamili, Ajaz Ali Bhat, Zahoor Ahmad Mir, Javaid Akhter Bhat, Anshika Tyagi, Sheikh Tajamul Islam, Muntazir Mushtaq, Prashant Yadav, Sandhya Rawat, Anita Grover
Pathogenesis-related (PR) proteins and antimicrobial peptides (AMPs) are a group of diverse molecules that are induced by phytopathogens as well as defense related signaling molecules. They are the key components of plant innate immune system especially systemic acquired resistance (SAR), and are widely used as diagnostic molecular markers of defense signaling pathways. Although, PR proteins and peptides have been isolated much before but their biological function remains largely enigmatic despite the availability of new scientific tools...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853165/bacterial-endophytes-modulates-the-withanolide-biosynthetic-pathway-and-physiological-performance-in-withania-somnifera-under-biotic-stress
#8
Aradhana Mishra, Satyendra Pratap Singh, Sahil Mahfooz, Arpita Bhattacharya, Nishtha Mishra, Pramod Arvind Shirke, C S Nautiyal
Despite the vast exploration of endophytic microbes for growth enhancement in various crops, knowledge about their impact on the production of therapeutically important secondary metabolites is scarce. In the current investigation, chitinolytic bacterial endophytes were isolated from selected medicinal plants and assessed for their mycolytic as well as plant growth promoting potentials. Among them the two most efficient bacterial endophytes namely Bacillus amyloliquefaciens (MPE20) and Pseudomonas fluorescens (MPE115) individually as well as in combination were able to modulate withanolide biosynthetic pathway and tolerance against Alternaria alternata in Withania somnifera...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853164/chemical-interaction-of-endophytic-fungi-and-actinobacteria-from-lychnophora-ericoides-in-co-cultures
#9
Fernanda O Chagas, Mônica T Pupo
Microorganisms interact chemically in natural environments; however, the compounds and mechanisms involved in this phenomenon are still poorly understood. Using the cocultivation approach, changes in metabolic profiles due to interactions between endophytic fungal and actinobacterial strains isolated from the plant Lychnophora ericoides (Asteraceae) were assessed. The production of the cytotoxic compound cytochalasin H by the fungus Phomopsis sp. FLe6 was remarkably inhibited in solid and liquid co-cultures with the actinobacteria Streptomyces albospinus RLe7...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29853163/talaromyces-pinophilus-strain-aun-1-as-a-novel-mycoparasite-of-botrytis-cinerea-the-pathogen-of-onion-scape-and-umbel-blights
#10
Ismail R Abdel-Rahim, Kamal A M Abo-Elyousr
This study aimed to investigate the mycoparasitism of Botrytis cinerea, the pathogen of scape and umbel blights of onion seed crops, by endophytic Talaromyces pinophilus. The dual culture test showed that the antagonistic potentiality of T. pinophilus against B. cinerea depend on the mycoparasitism that was morphologically detected by the formation of mycelial overgrowth. Moreover, the light micrograph of the mycelia at the contact zone exhibited that the hyphae of T. pinophilus penetrated and grew intracellularly inside the hyphae of B...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29103733/synthesis-nature-and-utility-of-universal-iron-chelator-siderophore-a-review
#11
REVIEW
Azmi Khan, Pratika Singh, Amrita Srivastava
Siderophores, the secondary metabolite of various microorganisms are ferric ion specific chelators secreted under iron stressed condition. These non-ribosomal peptides have been classified as catecholate, hydroxamate, carboxylate and mixed types. Recent studies focus on discovery of possible mammalian siderophores. The biosynthesis pathway including non-ribosomal dependent as well as non-ribosomal independent pathways are of great interest now a days. Many significant roles of siderophores such as virulence in pathogens, oxidative stress tolerance, classification of organisms etc...
July 2018: Microbiological Research
https://www.readbyqxmd.com/read/29705207/retraction-notice-to-marine-actinobacterial-metabolites-current-status-and-future-perspectives-micres_168_6-2013-311-322
#12
Panchanathan Manivasagan, Jayachandran Venkatesan, Kannan Sivakumar, Se-Kwon Kim
No abstract text is available yet for this article.
June 2018: Microbiological Research
https://www.readbyqxmd.com/read/29705206/tissue-age-and-plant-genotype-affect-the-microbiota-of-apple-and-pear-bark
#13
Elena Arrigoni, Livio Antonielli, Massimo Pindo, Ilaria Pertot, Michele Perazzolli
Plant tissues host complex fungal and bacterial communities, and their composition is determined by host traits such as tissue age, plant genotype and environmental conditions. Despite the importance of bark as a possible reservoir of plant pathogenic microorganisms, little is known about the associated microbial communities. In this work, we evaluated the composition of fungal and bacterial communities in the pear (Abate and Williams cultivars) and apple (Golden Delicious and Gala cultivars) bark of three/four-year-old shoots (old bark) or one-year-old shoots (young bark), using a meta-barcoding approach...
June 2018: Microbiological Research
https://www.readbyqxmd.com/read/29705205/phenotypic-and-genotypic-characterisation-of-an-unique-indigenous-hypersaline-unicellular-cyanobacterium-euhalothece-sp-nov
#14
Trisha Mogany, Feroz M Swalaha, Mushal Allam, Phillip Senzo Mtshali, Arshad Ismail, Sheena Kumari, Faizal Bux
A novel halotolerant species of cyanobacterium of the order Chroococcales was isolated from hypersaline estuary in Kwa-Zulu Natal, South Africa. A comprehensive polyphasic approach viz., cell morphology, pigment composition and complete genome sequence analysis was conducted to elucidate the taxonomic position of the isolated strain. The blue-green oval to rod-shaped cells were 14-18 μm in size, and contained a high amount of phycocyanin pigments. The strain was moderate thermotolerant/alkalitolerant halophile with the optimum conditions for growth at 35 °C, pH 8...
June 2018: Microbiological Research
https://www.readbyqxmd.com/read/29705204/comparison-of-genomic-islands-in-cyanobacteria-evidence-of-bacteriophage-mediated-horizontal-gene-transfer-from-eukaryotes
#15
James S Godde, Shakuntala Baichoo, Zahra Mungloo-Dilmohamud, Yasmina Jaufeerally-Fakim
A number of examples of putative eukaryote-to-prokaryote horizontal gene transfer (HGT) have been proposed in the past using phylogenetic analysis in support of these claims but none have attempted to map these gene transfers to the presence of genomic islands (GIs) in the host. Two of these cases have been examined in detail, including an ATP sulfurylase (ATPS) gene and a class I fructose bisphosphate aldolase (FBA I) gene that were putatively transferred to cyanobacteria of the genus Prochlorococcus from either green or red algae, respectively...
June 2018: Microbiological Research
https://www.readbyqxmd.com/read/29705203/biocontrol-of-sclerotinia-sclerotiorum-lib-de-bary-on-common-bean-by-native-lipopeptide-producer-bacillus-strains
#16
Daniela C Sabaté, Carolina Pérez Brandan, Gabriela Petroselli, Rosa Erra-Balsells, M Carina Audisio
Bacillus sp. B19, Bacillus sp. P12 and B. amyloliquefaciens B14 were isolated from soils of Salta province, and PGPR properties on the common bean (Phaseolus vulgaris L.) cv. Alubia and antagonistic activity against Sclerotinia sclerotiorum were studied. It was determined that B19 and P12 increased crop germination potential (GP) from the common bean by 14.5% compared to control seeds; these strains also increased root length (10.4 and 15%, respectively) and stem length (20.2 and 30%, respectively) compared to the control; however, as for the B14 strain, no increases in growth parameters were detected...
June 2018: Microbiological Research
https://www.readbyqxmd.com/read/29705202/subterranean-infestation-by-holotrichia-parallela-larvae-is-associated-with-changes-in-the-peanut-arachis-hypogaea-l-rhizosphere-microbiome
#17
Li-Li Geng, Gao-Xiang Shao, Ben Raymond, Mei-Ling Wang, Xiao-Xiao Sun, Chang-Long Shu, Jie Zhang
Rhizosphere microorganisms contribute to the health and development of crops and these beneficial microbes are recruited to the root-zone when plants experience biotic/abiotic stress. The subterranean pests Holotrichia parallela cause severe crop loss in peanut (Arachis hypogaea L.) fields. Hypothesizing that infestation by H. parallela larva may influence the composition of rhizosphere microbial communities, deep sequencing of V3 and V4 hypervariable regions of 16S rRNA gene was used to characterize the rhizosphere bacteria of infested and uninfested peanuts...
June 2018: Microbiological Research
https://www.readbyqxmd.com/read/29705201/fungal-communities-associated-with-evernia-prunastri-ramalina-fastigiata-and-pleurosticta-acetabulum-three-epiphytic-lichens-potentially-active-against-candida-biofilms
#18
Aurélie Lagarde, Patricia Jargeat, Mélanie Roy, Marion Girardot, Christine Imbert, Marion Millot, Lengo Mambu
Fungal communities associated to three epiphytic lichens active against Candida, were investigated using culture-based methods We hypothetized that associated fungi would contribute to lichens activities. The ability of specific fungi to grow inside or outside lichens was investigated. To detect biogenesis pathways involved in the production of secondary metabolites, genes coding for nonribosomal peptide synthetase (NRPS) and polyketide synthase I (PKS I) were screened by PCR from fungal DNA extracts. Both endo and epilichenic communities were isolated from two fructicose (Evernia prunastri and Ramalina fastigiata) and one foliose (Pleurosticta acetabulum) lichens...
June 2018: Microbiological Research
https://www.readbyqxmd.com/read/29625661/antibiotic-producing-pseudomonas-fluorescens-mediates-rhizome-rot-disease-resistance-and-promotes-plant-growth-in-turmeric-plants
#19
S R Prabhukarthikeyan, U Keerthana, T Raguchander
Rhizome rot of turmeric caused by Pythium aphanidermatum is a major threat to turmeric-cultivating areas of India. This study intends to evaluate the performance of fluorescent pseudomonads against Rhizome rot disease and understand the resistance mechanism in Turmeric plants. Fluorescent pseudomonads were screened against Pythium aphanidermatum using dual culture. Selected strains were evaluated for the performance of growth promoting attributes and the presence of antibiotic genes through PCR analysis. Strain FP7 recorded the maximum percent inhibition of P...
May 2018: Microbiological Research
https://www.readbyqxmd.com/read/29625660/the-transcription-factor-encoding-gene-crtf-is-involved-in-clonostachys-chloroleuca-mycoparasitism-on-sclerotinia-sclerotiorum
#20
Zhan-Bin Sun, Qi Wang, Jun Zhang, Wei-Zhi Jiang, Qi Wang, Shi-Dong Li, Gui-Zhen Ma, Man-Hong Sun
Clonostachys chloroleuca 67-1 (formerly C. rosea 67-1) is a potential biocontrol fungus active against various fungal plant pathogens. From transcriptome sequencing of 67-1 parasitizing sclerotia of Sclerotinia sclerotiorum, we identified the transcription factor-encoding gene crtf that is significantly up-regulated during mycoparasitism. Transcription factors are widely distributed in fungi and involved in multiple biological processes. However, their role and regulatory mechanisms in mycoparasitism remain poorly understood...
May 2018: Microbiological Research
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