Bibliografie tematiche / Pantoea

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Letteratura scientifica selezionata sul tema "Pantoea"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Pantoea"

1

Brady, C. L., S. N. Venter, I. Cleenwerck, K. Engelbeen, M. Vancanneyt, J. Swings e T. A. Coutinho. "Pantoea vagans sp. nov., Pantoea eucalypti sp. nov., Pantoea deleyi sp. nov. and Pantoea anthophila sp. nov." INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 59, n. 9 (20 luglio 2009): 2339–45. http://dx.doi.org/10.1099/ijs.0.009241-0.

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2

Brady, Carrie L., Ilse Cleenwerck, Lorinda van der Westhuizen, Stephanus N. Venter, Teresa A. Coutinho e Paul De Vos. "Pantoea rodasii sp. nov., Pantoea rwandensis sp. nov. and Pantoea wallisii sp. nov., isolated from Eucalyptus". International Journal of Systematic and Evolutionary Microbiology 62, Pt_7 (1 luglio 2012): 1457–64. http://dx.doi.org/10.1099/ijs.0.032615-0.

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Abstract (sommario):
Several Gram-negative-staining, facultatively anaerobic bacterial isolates were obtained from Eucalyptus seedlings showing symptoms of bacterial blight and dieback in Colombia, Rwanda and South Africa. Partial 16S rRNA gene sequencing, together with partial gyrB sequencing, placed the isolates in the genus Pantoea and indicated that they constituted three novel species. Multilocus sequence analysis (MLSA) based on partial sequences of gyrB, rpoB, infB and atpD revealed Pantoea dispersa , Pantoea eucrina and Pantoea cypripedii as their closest phylogenetic relatives. DNA–DNA hybridization studies confirmed the classification of the new isolates as three novel species and phenotypic tests allowed them to be differentiated from their closest phylogenetic neighbours. The names Pantoea rodasii sp. nov. [type strain LMG 26273T = BD 943T (deposited with the Plant Pathogenic and Plant Protecting Bacteria Collection, South Africa) = BCC 581T (deposited with the Bacterial Culture Collection, Forestry and Agricultural Institute, South Africa)], Pantoea rwandensis sp. nov. (type strain LMG 26275T = BD 944T = BCC 571T) and Pantoea wallisii sp. nov. (type strain LMG 26277T = BD 946T = BCC 682T) are proposed.
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3

Sudhalkar, Aditya, Ajit B. Majji, Jay Chhablani e Guruprasad Manderwad. "PANTOEA AGGLOMERANS ENDOPHTHALMITIS". Retina 34, n. 8 (agosto 2014): 1702–6. http://dx.doi.org/10.1097/iae.0000000000000127.

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4

Yoshida, Shigenobu, Linda L. Kinkel, Hirosuke Shinohara, Nobutaka Numajiri, Syuntaro Hiradate, Motoo Koitabashi, Kazuo Suyama, Hiromitsu Negishi e Seiya Tsushima. "Production of quorum-sensing-related signal molecules by epiphytic bacteria inhabiting wheat heads". Canadian Journal of Microbiology 52, n. 5 (1 maggio 2006): 411–18. http://dx.doi.org/10.1139/w05-146.

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Abstract (sommario):
The production of quorum-sensing-related signal molecules (QSRMs) among culturable bacteria comprising the community on wheat heads was investigated. The taxonomic position of 186 bacterial isolates obtained from ten heads was inferred based on 16S rRNA gene sequences, and their QSRM production was determined using two bioreporter strains of N-acylhomoserine lactones. Approximately 33% of isolates produced QSRMs, though the proportion of QSRM-producing isolates on a wheat head was significantly negatively correlated with population size. Most of the producing isolates were Pantoea species, most commonly Pantoea ananatis. Furthermore, the proportion of Pantoea ananatis that produced QSRMs was significantly negatively correlated with the number of bacterial genera (community richness) on each head. Finally, community richness was positively correlated with population size. Qualitative analysis using thin-layer-chromatography revealed that the QSRMs of Pantoea isolates were composed of at least two compounds. This is the first report indicating that Pantoea ananatis isolates inhabiting wheat heads are capable of producing QSRMs. QSRM production by Pantoea spp. may contribute to the predominance of this genus on wheat heads, particularly at relatively low population densities and community diversity.Key words: quorum sensing, signal molecule, epiphyte, wheat head, Pantoea spp.
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5

Popp, Alexandra, Ilse Cleenwerck, Carol Iversen, Paul De Vos e Roger Stephan. "Pantoea gaviniae sp. nov. and Pantoea calida sp. nov., isolated from infant formula and an infant formula production environment". International Journal of Systematic and Evolutionary Microbiology 60, n. 12 (1 dicembre 2010): 2786–92. http://dx.doi.org/10.1099/ijs.0.019430-0.

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Abstract (sommario):
Five Gram-negative, facultatively anaerobic, non-spore-forming, coccoid rod-shaped bacterial isolates were obtained from infant formula and an infant formula production environment and were investigated by use of a polyphasic taxonomic study. Biochemical tests and partial rpoB gene sequence analysis of the five isolates revealed that they formed two distinct groups in the family Enterobacteriaceae, closely related to several species of the genera Pantoea and Erwinia, which indicated a phylogenetic position within the genus Pantoea or the genus Erwinia. Multilocus sequence analysis of concatenated partial atpD, gyrB, infB and rpoB gene sequences of two of the isolates suggested that they represented two novel species of the genus Pantoea, phylogenetically related most closely to Pantoea septica. The five isolates had general characteristics consistent with those of the genus Pantoea, and DNA–DNA hybridizations between two representatives and the type strains of their phylogenetically closest relatives based on comparative 16S rRNA gene sequence analysis showed that the isolates represented two novel genospecies. These two genospecies could be differentiated from each other based on fermentation of galacturonate, sorbitol and potassium 5-ketogluconate. They could be differentiated from phylogenetically related Pantoea species based on their ability to ferment lactose and to utilize β-gentiobiose and raffinose, their inability to ferment or utilize d-arabitol, and their inability to produce indole. On the basis of the results obtained, the five isolates are considered to represent two novel species of the genus Pantoea, for which the names Pantoea gaviniae sp. nov. (type strain A18/07T =LMG 25382T =DSM 22758T) and Pantoea calida sp. nov. (type strain 1400/07T =LMG 25383T =DSM 22759T) are proposed.
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6

Brady, Carrie L., Ilse Cleenwerck, Stephanus N. Venter, Katrien Engelbeen, Paul De Vos e Teresa A. Coutinho. "Emended description of the genus Pantoea, description of four species from human clinical samples, Pantoea septica sp. nov., Pantoea eucrina sp. nov., Pantoea brenneri sp. nov. and Pantoea conspicua sp. nov., and transfer of Pectobacterium cypripedii (Hori 1911) Brenner et al. 1973 emend. Hauben et al. 1998 to the genus as Pantoea cypripedii comb. nov." International Journal of Systematic and Evolutionary Microbiology 60, n. 10 (1 ottobre 2010): 2430–40. http://dx.doi.org/10.1099/ijs.0.017301-0.

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Abstract (sommario):
Bacterial strains belonging to DNA hybridization groups (HG) II, IV and V, in the Erwinia herbicola–Enterobacter agglomerans complex, of Brenner et al. [Int J Syst Bacteriol 34 (1984), 45–55] were suggested previously to belong to the genus Pantoea, but have never been formally described and classified. Additionally, it has been shown in several studies that Pectobacterium cypripedii is more closely related to species of Pantoea than to those of Pectobacterium. In this study, the phylogenetic positions of Brenner's DNA HG II, IV and V and Pectobacterium cypripedii were re-examined by both 16S rRNA gene sequencing and multilocus sequence analyses (MLSA) based on the gyrB, rpoB, atpD and infB genes. The analyses revealed that DNA HG II, IV and V and Pectobacterium cypripedii form five separate branches within the genus Pantoea (strains from HG V were split into two branches). DNA–DNA hybridization data further confirmed that DNA HG II, IV and V constitute four separate species. Pectobacterium cypripedii was shown to be a close phylogenetic relative of Pantoea dispersa and DNA HG IV by both 16S rRNA gene sequence and MLSA analyses. Biochemical analyses performed on strains from DNA HG II, IV and V and Pectobacterium cypripedii confirmed their taxonomic position within the genus Pantoea and revealed phenotypic characteristics that allow the differentiation of these species from each other and from their closest phylogenetic neighbours. It is proposed to emend the description of the genus Pantoea and to describe Pantoea septica sp. nov. for DNA HG II (type strain LMG 5345T =BD 874T =CDC 3123-70T), Pantoea eucrina sp. nov. for DNA HG IV (type strain LMG 2781T =BD 872T =CDC 1741-71T =LMG 5346T), Pantoea brenneri sp. nov. for strains of DNA HG V excluding LMG 24534 (type strain LMG 5343T =BD 873T =CDC 3482-71T) and Pantoea conspicua sp. nov. for the remaining strain of DNA HG V (type strain LMG 24534T =BD 805T =CDC 3527-71T) and to transfer Pectobacterium cypripedii to the genus as Pantoea cypripedii comb. nov. (type strain LMG 2657T =ATCC 29267T =DSM 3873T =LMG 2655T).
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7

Vargas, Edgar, e Giselle Abarca. "Relación entre el estrés y las bacterias entomopatógenas Pantoea (Erwinia) agglomerans (herbicola) y Bacillus cereus en jobotos (Col: Melolonthidae) (Phyllophaga spp., Anomala spp. y Cyclocephala spp.), en Costa Rica." Agronomía Mesoamericana 9, n. 2 (30 maggio 2016): 25. http://dx.doi.org/10.15517/am.v9i2.19466.

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Abstract (sommario):
Concentrations of Colony Forming Units (CFU) were determined for two entomopathogenic bacteria (Pantoea agglomerans and Bacillus cereus), at the egg, larval, pupal, and adult stages of agriculturally important Phyllophaga and Cyclocephala white grubs, which were collected in five agroecosystems in Costa Rica. L2 and L3 larvae of Phyllophaga elenans collected in all regions where the study was conducted were extensive carriers of Pantoea agglomerans and Bacillus cereu. L2 and L3 larvae of Phyllophaga obsoleta, Phyllophaga menetriesi, Cyclocephala sanguinicollis and Cyclocephala castaniella found in the Central Valley and Central Pacific regions were carriers of Pantoea agglomerans and Bacillus cereus bacteria. In 60% to 90% of larvae in all white grub varieties studied, Pantoea agglomerans showed greater concentrations of CFU than Bacillus cereu, which showed the lowest CFU concentration. Egg, pupal, and adult mortality in all Phyllophaga species was due to Pantoea agglomerans in 62%, 80% and 22.5% of the cases, respectively. A possible antagonistic interaction between Pantoea agglomerans and Bacillus cereus is also discussed. In general, it was noted that light and larval manipulation were the main stress factors affecting these scarabids.
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8

Kageyama, B., M. Nakae, S. Yagi e T. Sonoyama. "Pantoea punctata sp. nov., Pantoea citrea sp. nov., and Pantoea terrea sp. nov. Isolated from Fruit and Soil Samples". International Journal of Systematic Bacteriology 42, n. 2 (1 aprile 1992): 203–10. http://dx.doi.org/10.1099/00207713-42-2-203.

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9

Brady, Carrie L., Teresa Goszczynska, Stephanus N. Venter, Ilse Cleenwerck, Paul De Vos, Ronald D. Gitaitis e Teresa A. Coutinho. "Pantoea allii sp. nov., isolated from onion plants and seed". International Journal of Systematic and Evolutionary Microbiology 61, n. 4 (1 aprile 2011): 932–37. http://dx.doi.org/10.1099/ijs.0.022921-0.

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Abstract (sommario):
Eight yellow-pigmented, Gram-negative, rod-shaped, oxidase-negative, motile, facultatively anaerobic bacteria were isolated from onion seed in South Africa and from an onion plant exhibiting centre rot symptoms in the USA. The isolates were assigned to the genus Pantoea on the basis of phenotypic and biochemical tests. 16S rRNA gene sequence analysis and multilocus sequence analysis (MLSA), based on gyrB, rpoB, infB and atpD sequences, confirmed the allocation of the isolates to the genus Pantoea. MLSA further indicated that the isolates represented a novel species, which was phylogenetically most closely related to Pantoea ananatis and Pantoea stewartii. Amplified fragment length polymorphism analysis also placed the isolates into a cluster separate from P. ananatis and P. stewartii. Compared with type strains of species of the genus Pantoea that showed >97 % 16S rRNA gene sequence similarity with strain BD 390T, the isolates exhibited 11–55 % whole-genome DNA–DNA relatedness, which confirmed the classification of the isolates in a novel species. The most useful phenotypic characteristics for the differentiation of the isolates from their closest phylogenetic neighbours are production of acid from amygdalin and utilization of adonitol and sorbitol. A novel species, Pantoea allii sp. nov., is proposed, with type strain BD 390T ( = LMG 24248T).
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10

Kato Tanaka, Yuko, Nobuhiro Horie, Kaoru Mochida, Yoshihiro Yoshida, Eri Okugawa e Fumio Nanjo. "Pantoea theicola sp. nov., isolated from black tea". International Journal of Systematic and Evolutionary Microbiology 65, Pt_10 (1 ottobre 2015): 3313–19. http://dx.doi.org/10.1099/ijsem.0.000412.

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Abstract (sommario):
A Gram-negative, facultatively anaerobic strain was isolated from black tea. On the basis of 16S rRNA gene sequence similarity comparisons, strain QC88-366T was grouped into the genus Pantoea, being related most closely to the type strains of Pantoea gaviniae (98.5 %) and Pantoea calida (98.3 %); sequence similarities were ≤ 97.0 % to the type strains of other species of the genus Pantoea. Multilocus sequence analysis based on partial sequences of the gyrB, rpoB, infB and atpD genes also revealed P. gaviniae and P. calida as the closest phylogenetic relatives. The fatty acid profile showed the major fatty acids of strain QC88-366T were C16 : 0, C16 : 1 and C18 : 1, the same as those of its closest related species. However, the ratio of C16 : 1, C17 : 0 cyclo, C18 : 1 and C18 : 2 differed slightly compared with those of the related neighbours. In addition, the results of physiological and biochemical tests also allowed the phenotypic differentiation of strain QC88-366T from its closest phylogenetic neighbours. The G+C content of the DNA was 57.2 mol%. Strain QC88-366T therefore represents a novel species of the genus Pantoea, for which the name Pantoea theicola sp. nov. is proposed. The type strain is QC88-366T ( = DSM 29212T = NBRC 110557T).
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Più fonti

Tesi sul tema "Pantoea"

1

Brady, Carrie Louise. "Taxonomy of Pantoea associated with bacterial blight of Eucalyptus". Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-02092006-110117.

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2

Weller-Stuart, Tania. "Genomic and functional characterization of motility in Pantoea ananatis". Thesis, University of Pretoria, 2015. http://hdl.handle.net/2263/79208.

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Abstract (sommario):
Pantoea ananatis causes disease symptoms in a wide range of economically important plants such as Eucalyptus, maize and onions. This study specifically focussed on the interactions of P. ananatis LMG20103 with onion seedlings where it causes symptoms that include water-soaked lesions, wilting and bleaching of the leaves, and maceration of the bulbs. The pathogenicity of P. ananatis is not well understood, however, motility plays an important role in many other well-known phytopathogens such as Ralstonia solanacearum and Pseudomonas syringae. It is therefore hypothesised that P. ananatis uses motility to colonise and infect its hosts. Chapter 1 reviews the literature on how motility aids phytopathogenic bacteria in locating their host, attaching and initiating infection, as well as dissemination. The two dominant forms of motility utilised are swimming and twitching motility. Swimming motility is essentially the rotation of flagella which propels the bacterial cell forward through a fluid environment in response to chemotactic signals. The motor that drives the flagella is made up of several proteins that include the MotAB proteins and its function is dependent on a proton motive force. While twitching motility is not as fast as swimming motility, it is a rapid means of surface colonisation. Bacteria twitch by extending their type IV pili, attaching to the surface, and then retracting, bringing the whole cell closer to the point of contact. This motion is powered by the ATPase PilT. In Chapter 2 the flagellum and type IV pilus biosynthetic gene clusters are compared between strains of P. ananatis and closely related enterobacterial strains. The four fully annotated and sequenced P. ananatis strains used in this study were isolated from various different sources and provided a greater understanding of how P. ananatis exploits its flagella and type IV pili to infect such a wide variety of hosts. While Chapter 3 focuses on the creation of four motility mutants and their respective complements in P. ananatis LMG20103, Chapter 4 consists of an array of tests and assays comparing the mutants to the wild-type strain to elucidate the role of swimming and twitching motility in the colonisation and infection of P. ananatis in onions. Chapter 5 is a published article titled, “Draft genome sequences of the onion centre rot pathogen Pantoea ananatis PA4 and maize brown stalk rot pathogen P. ananatis BD442.” Both strains are South African isolates and were sequenced using the Illumina HiSeq 2500 platform. A greater understanding of how P. ananatis uses motility to target tissues and infect its host plant increases the currently limited body of knowledge available to develop strategies to limit the damage caused by this pathogen to agronomic crops in plantations and nurseries.
Thesis (PhD)--University of Pretoria, 2015.
Microbiology and Plant pathology
PhD
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3

du, Plessis Marike. "Phylo- and comparative genomics of the Pantoea core genome". Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/79232.

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Abstract (sommario):
The delineation of bacterial species and genera has always been problematic as a clear definition of these concepts are lacking. In an attempt to classify bacteria into workable groups, operational criteria have been applied to delimitate boundaries for these taxonomic ranks. This approach has unfortunately led to artificial groupings that are often not comparable in terms of diversity in different groups of bacteria. A classification system needs to reflect natural groupings to depict the evolution of bacteria and predict the phenotypic and genetic diversity for these groups. In order to understand the forces that play a role in the evolution of a bacterial genus a review of the current literature was presented in Chapter 1. The major focus was on vertical inheritance and how this process can be used to depict the evolutionary path of members belonging to the same genus. The largest amount of genetic material in any one cell is thought to have been transferred from parent to progeny, supporting the idea that the vertical signal is recoverable and can in fact be the dominant signal present in the genome when looking at conserved genes. The effect of horizontal gene transfer (HGT) on the evolutionary picture obtained by vertical descent was also discussed. The core genome of a genus is defined as the genes conserved between all species of a genus and are thought to mostly include genes that are essential for the survival of members of that particular genus. In Chapter 2, the hypothesis was tested that the boundaries used to delineate genera could be based on an analysis of the shared core genome. For this purpose coherence within the core genome of the genus Pantoea was investigated. The core was characterised in terms of its functional diversity through Clusters of Orthologous Genes (COGs) and compared to the core genomes of other bacterial genera. It was seen that the core genome does give an indication of the coherence of a genus and that shared genome content can be used as a tool to delimitate genera. Previous taxonomic studies have shown that species in the genus Pantoea are well defined but that the phylogenetic relationships between these species are not well elucidated. Generally accepted approaches for phylogenetic inference, like 16S rRNA gene trees and multi-locus sequence analysis (MLSA), does not give sufficient resolution to determine the deeper evolutionary relationships between these species. In Chapter 3, phylogenomic analyses were performed to determine if a robust phylogeny, reflecting the evolutionary history of the genus, can be obtained using the core genome of the genus. The core genome as well as subsets thereof (based on COGs), was used for phylogenetic inference, to obtain a robust phylogeny for the genus.
Dissertation (MSc)--University of Pretoria, 2014.
Microbilogy and Plant pathology
MSc
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4

Galbraith, Matthew Dominic. "Further studies on AGA production by Pantoea agglomerans strain Eh1087". Thesis, University of Canterbury. Biological Sciences, 2004. http://hdl.handle.net/10092/6785.

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Abstract (sommario):
Pantoea agglomerans strain Eh1087 produces the phenazine antibiotic Dalanylgriseoluteic acid (AGA). A cluster of 16 genes has previously been shown to be responsible for the production of, and resistance to, AGA. The present study has refined and tested a number of hypotheses arising from the preliminary characterisation of the AGA pathway. The products of the first five genes of the AGA cluster, Group 1, are similar to proteins responsible for phenazine-1-carboxy lie acid by fluorescent pseudomonads. However, Eh1087 appears to be missing a duplication of the ehpA gene, and it was hypothesised that EhpA was responsible for the ability of Eh1087 to produce both phenazine-1- carboxylic acid and phenazine-1,6-dicarboxylic. Comparison of EhpA to related proteins of known structure suggested a catalytic function, and EhpA was found to influence the relative amounts of phenazine-1-carboxylic acid and phenazine-1,6- dicarboxylic acid produced by Group 1. The final step in the AGA pathway is the addition of a D-alanyl residue to griseoluteic acid to form AGA, and is catalysed by the EhpMNO proteins. The previous model for AGA biosynthesis suggested that EhpM was an integral membrane protein and that EhpMNO operated in the periplasm. EhpM and EhpN are similar to components of nonribosomal peptide synthetases, while EhpO is similar to ketosynthases involved in fatty acid and polyketide biosynthesis. Comparison of EhpM with known structures, and preliminary analysis of the subcellular location of EhpMNO suggest that these proteins may be localised to the cytoplasmic side of the inner membrane, rather than the periplasm. An Eh1087 transposon-mutant with an insertion that affected the expression of glnA was isolated. This mutant lacked glutamine synthetase, and was, therefore, not able to incorporate labelled nitrogen from ammonium sulphate, via glutamine, into phenazines. It was concluded that glutamine is the source of the two nitrogen atoms of the phenazine nucleus. In addition, the function of the putative Eh1087 glnA locus was confirmed by complementation of an E.coli glnA mutant and the gene found to encode a type I glutamine synthetase typical of the Enterobacteriaceae.
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5

Sibanda, Siphathele. "Role of quorum sensing in the virulence of Pantoea ananatis". Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/30941.

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Abstract (sommario):
Pantoea ananatis, a plant pathogenic bacterium, inflicts significant economic losses to the agricultural and forestry industries. It is ubiquitous and capable of surviving in a diverse range of environmental conditions. The mechanism underlying host infection and colonization by this pathogen is poorly understood. The genome sequence of P. ananatis led to the discovery of putative pathogenicity determinants such as quorum sensing. In this study, a PCR-mediated protocol that makes use of the lambda () red genes was used to knockout the genes for the three quorum sensing systems in P. ananatis LMG 2665T. The mutant strain was named EanΔI/R,RhlΔI/R,ΔLuxS. Growth assays conducted using this mutant and the wild-type strain showed that the mutations did not affect its growth in liquid broth. This mutant was used to determine the role of quorum sensing in the virulence of P. ananatis. Virulence assays conducted showed that quorum sensing is required for virulence in P. ananatis. To elucidate the role of individual quorum sensing systems in the virulence of P. ananatis, mutants lacking one system were constructed following the  Red-mediated PCR protocol. The mutant strains were complemented by cloning the wild-type genes for the respective quorum sensing systems into the broad-host-range plasmid pBR1MCS-5. The mutant strains were named EanΔI/R, RhlΔI/R and ΔLuxS based on the quorum sensing genes that were mutated. The complemented strains were named EanΔI/R::EanI/R, RhlΔI/R::RhlI/R and ΔLuxS::LuxS, respectively. In vitro growth studies showed that the genetically modified P. ananatis strains were not impaired in their growth. The P. ananatis quorum sensing mutant strains and complemented mutant strains were used to determine the functional role of each quorum sensing system in P. ananatis. Characterization of the quorum sensing mutant strains revealed that the three quorum sensing systems are required for virulence of P. ananatis in onion seedlings. The virulence assays conducted showed that the LuxS quorum sensing system is the most crucial system for virulence in P. ananatis. Furthermore, in vitro studies of quorum sensing regulation of specific phenotypes of P. ananatis showed that quorum sensing governs biofilm formation and exopolysaccharide production. The phenotypes that were impaired in the quorum sensing mutant strains were restored to wild-type levels by genetic complementation. This study also showed that swarming and twitching motility, as well as rhamnolipid production are not influenced by quorum sensing in P. ananatis. The dependence of specific phenotypes on quorum sensing indicates the significance of the functional role of quorum sensing genes in the virulence of P. ananatis.
Dissertation (MSc)--University of Pretoria, 2012.
Microbiology and Plant Pathology
MSc
Unrestricted
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6

Swart, Lorinda. "Pantoea and Xanthomonas species associated with blight and die-back of Eucalyptus". Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/31420.

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Abstract (sommario):
The pulp and paper industry is expanding world-wide to supply the needs and demands of the consumer. Due to this rapid expansion of commercial forests and our ever changing climate including the sporadic increase and decrease in rain and the increasing temperature caused by global warming, previously described and new pathogens are emerging which infect and cause diseases on commercial forest trees and agricultural crops. Research efforts are required to investigate mechanisms of disease control and eradication to prevent the propagation and rapid spread of these pathogens and ensure that there is limited economical loss of forestry and other agriculturally important plants and trees. Since both Xanthomonas and Pantoea species are becoming increasing important as emerging bacterial pathogens, their rapid and accurate identification is crucially important. Little is known about bacterial pathogens on forestry trees since the most prominent diseases of these hosts are caused by fungi. The focus of this study was to investigate and identify the bacterial pathogens associated with Eucalyptus. However, as has been seen in various studies including this one, the identification of these pathogens is not always straightforward and often time consuming. In this study the use of polyphasic identification approach was used which employs a combination of phenotypic and genotypic identification techniques. Both of the genera investigated in this study, namely Pantoea and Xanthomonas, have been found to infect a variety of agriculturally important plant hosts. Pantoea species have previously been isolated from Eucalyptus trees suffering from blight and dieback symptoms. The species isolated have included P. eucalypti from Uruguay, P. vagans isolated from Argentina, Colombia, Uganda and Uruguay and P. deleyi from Uganda. Since the first report of Pantoea on Eucalyptus trees from South Africa in 2002 it has spread locally causing sporadic outbreaks. This pathogen has also been isolated from Eucalyptus trees in other parts of the world including, Argentina, Colombia, Thailand, Uganda and Uruguay. Xanthomonas campestris pv. eucalypti was previously found to cause disease on Eucalyptus trees in Australia. Since then, three other Xanthomonas species have been isolated from Eucalyptus, namely, Xanthomonas spp. from Brazil (Goncalves et al., 2008), X. vasicola from South Africa and X. fuscans from Uruguay as seen in this study.
Dissertation (MSc)--University of Pretoria, 2010.
Microbiology and Plant Pathology
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7

Ramachandran, Revathy. "Investigation of the quorum-sensing regulon in the corn pathogen Pantoea stewartii". Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/56840.

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Pantoea stewartii subsp. stewartii is a bacterium that causes Stewart’s wilt disease in corn plants. The bacteria are transmitted to the plants via an insect vector, the corn flea beetle Chaetocnema pulicaria. Once in the plant, the bacteria migrate to the xylem and grow to high cell densities, forming a biofilm by secreting excess capsular exopolysaccharide, which blocks water transport and causes wilting. The timing of virulence factor synthesis is regulated by the cell-density dependent quorum sensing (QS) system. Such temporal regulation is crucial in establishing infection and is orchestrated by the QS-dependent transcriptional regulator EsaR. EsaR represses expression of capsular exopolysaccharide at low cell densities. At high cell densities, an acylated homoserine lactone (AHL) molecule produced during growth by the cognate AHL-synthase EsaI accumulates. The AHL binds to and inactivates EsaR, causing derepression of capsule production. EsaR is a member of the LuxR family of QS-dependent transcriptional factors. Most LuxR homologs are unstable and/or insoluble in the absence of AHL which has hindered structural studies. Chapter Two describes the changes in the structure of EsaR due to binding of AHL ligand as determined through biochemical methods. EsaR was found to be stable and retain its multimeric state in the absence or presence of AHL, but intra- and inter-domain changes occurred that affect its DNA-binding capacity. Apart from repressing expression of capsule at low cell-densities, EsaR represses its own expression and activates production of a small RNA, EsaS, with unknown function. In Chapter Three a proteomic approach was used to identify an additional 30 QS-controlled proteins. Genes encoding three of these proteins are directly regulated by EsaR and the EsaR binding sites in the respective promoters were defined. In Chapter Four, a high-throughput RNA-Seq method identified even more genes in the QS regulon that the proteomic approach overlooked. RNA-Seq analysis of rRNA-depleted RNA from two strains of P. stewartii was used as a screen to help identify 11 promoters, subsequently shown to be directly regulated by EsaR in vitro. Most of the genes controlled by QS grouped into three major physiological responses, capsule & cell wall production, surface motility & adhesion and stress response. In Chapter Five, the role of two QS regulated genes, dkgA (encoding 2, 5-diketo-D-gluconate) and lrhA (encoding a repressor of chemotaxis, adhesion and motility), in plant virulence were examined. These studies have better characterized the QS regulator EsaR and its interaction with the AHL ligand, and shown that QS has a more global response in P. stewartii than previously recognized. Further characterization of the genes identified in this study could facilitate identification of factors crucial in plant pathogenesis or insect-vector symbiosis and aid in the development of molecular-based approaches for possible disease intervention.
Ph. D.
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BEJI, AMOR. "Individualisation et definition de trois nouvelles especes regroupees anterieurement dans le complexe erwinia herbicola-enterobacter agglomerans". Lille 2, 1989. http://www.theses.fr/1989LIL2P265.

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Moreno, González M. del Carmen. "Characterization and mechanism of action of the biological control agent Pantoea agglomerans EPS125". Doctoral thesis, Universitat de Girona, 2006. http://hdl.handle.net/10803/7796.

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La soca EPS125 ha mostrat ser un efectiu agent de control biològic de diferents patògens fúngics de postcollita en diferents fruits. Degut a la seva elevada eficàcia, es va plantejar desenvolupar aquesta soca comercialment i per aquest motiu en el present treball es plantejà complementar la informació necessària pel seu registre.
D'acord amb els resultats obtinguts mitjançant proves fenotípiques i genotípiques, la soca EPS125 queda inclosa dins l'espècie Pantoea agglomerans (Enterobacter agglomerans-Erwinia herbicola). En relació a la utilització de fonts de carboni, en el perfil i contingut d'àcids grassos cel·lulars i en el polimorfisme en la longitud dels fragments de macrorestricció genòmica (MRFLP), la soca EPS125 mostrà trets característics que la diferencien d'altres soques. Els dos marcadors moleculars (125.2 i 125.3) específics per la soca EPS125 dissenyats en el present treball mostraren ser semiespecífics per la seva detecció mitjançant la tècnica PCR i Real Time PCR. Quedant pendent l'anàlisi d'especificitat de l'ús combinat dels dos marcadors moleculars en una reacció PCR multiplex. P. agglomerans EPS125 ha mostrat ser molt efectiva en el control de Penicillium expansum en poma amb una dosi efectiva mitjana de 2.7x105 a 7x105 ufc/ml, i una ratio de 25-101 cèl·lules de la soca EPS125 per inactivar una espora del patogen segons el model de saturació hiperbòlica. Segons les aproximacions fenotípiques i estudis genotípics realitzats, sembla que els mecanismes de biocontrol utilitzats per la soca EPS125 contra P. expansum en poma estan directament relacionats amb la capacitat de formació de biofilm per aquesta soca.
Strain EPS125 has shown effectiveness against a wide range of fungal pathogens in a large variety of fruit. However, to develop this strain as commercial biopesticide an extensive characterization is essential. For this reason, the objective of this PhD thesis was to complete the necessary information for its future registration.
According to morphological and biochemical tests, strain EPS125 pertain to Pantoea agglomerans (Enterobacter agglomerans-Erwinia herbicola) species. This strain showed typical traits different from other bacteria in relation to the ability to use several carbon sources, the fatty acid profiles and the macrorestriction fragment length polymorphism (MRFLP) pattern. The two DNA molecular markers of P. agglomerans EPS125 (125.2 and 125.3) obtained in the present work were semispecific in the detection of strain EPS125 by means of PCR and Real Time PCR. However, the combined use of the two primer sets in a multiplex PCR reaction would be specific. P. agglomerans EPS125 was highly effective against P. expansum in apple fruit having a median effective dose from 2.7x105 to 7x105 cfu/ml and a ratio of 101 and 25 EPS125 cells to inactivate one pathogen spore according to the hyperbolic saturation model.
Biocontrol mechanisms used by P. agglomerans EPS125 against P. expansum in apple fruit may be related with the ability of biofilm formation by this strain as show phenotypic approaches and genotypic studies.
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Kini, Kossi. "Pantoea spp : une nouvelle menace bactérienne pour la production rizicole en Afrique subsaharienne". Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG015.

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Parmi les 24 espèces de Pantoea décrites à nos jours, cinq ont été signalées jusqu'à 46 fois dans 21 pays comme phytopathogènes d'au moins 31 cultures. En effet, P. ananatis et P. agglomerans ont été signalés comme bactéries phytopathogènes pour au moins dix cultures économiquement importantes, y compris le riz. Récemment, le Centre du riz pour l'Afrique et ses partenaires ont soupçonné la présence d'une bactérie émergente qui provoque le flétrissement bactérienne du riz dans plusieurs pays africains, et l'agent causal a été confirmé comme appartenant au genre Pantoea. Les objectifs de notre projet de thèse étaient (i) d'améliorer la collection d'isolats d’AfricaRice existante par de nouvelles collections (ii) de développer des outils de diagnostic et de caractérisations pour une analyse fine de la diversité génétique, phénotypique et des études d’épidémio-suivaillance. Nos résultats ont montré que les bactéries capables de produire des symptômes de flétrissement bactérien du riz en Afrique forment un complexe d'espèces composé principalement de P. ananatis, P. stewartii et P. agglomerans. Différents types d'outils de diagnostic et de caractérisations ont ensuite été développés et validés. Les résultats de l'utilisation de ces outils ont permis de mettre en évidence la présence de ce complexe bactérien dans plusieurs pays Africains et de fournir des détails sur sa repartition géographique. Ainsi, au total, nous avons diagnostiqué un complexe d'espèces bactériennes, phytopathogènes du riz dans 11 pays africains (Bénin, Burkina Faso, Burundi, Ghana, Côte d'Ivoire, Mali, Niger, Nigeria, Sénégal, Tanzanie, Togo). En outre, l'analyse de trois génomes de P. ananatis Africain isolé du riz, et le développement, l'évaluation et l'application d'outils d'analyse VNTR à locus multiples (MLVA) ont permis de mieux comprendre les relations phylogénétiques et phylogénomiques existant entre les souches de P. ananatis isolées du riz et des souches d' autres sources (plantes, animaux et environnement). En effet, les résultats préliminaires ont montré que plusieurs souches de P. ananatis isolées du riz en Afrique, en Asie et en Europe étaient phylogénétiquement liées et formaient un groupe qui les différenciait de P. ananatis d'autres sources. En conclusion, les résultats de ce projet de thèse fournissent une base solide qui facilitera les futures études de Pantoea spp en Afrique
Among the 24 species of Pantoea described so far, five have been reported up to 46 times in 21 countries as phytopathogens of at least 31 crops. Indeed, P. ananatis and P. agglomerans have been reported as phytopathogenic bacteria for at least ten economically important crops, including rice. Recently, Africa Rice Center and its partners have suspected the presence of an emerging bacterium that causes rice bacterial blight in several African countries, and the causal agent has been confirmed as belonging to the genus Pantoea. The objectives of our thesis project were (i) to improve the collection of existing AfricaRice isolates by new collections (ii) to develop diagnostic and characterization tools for fine analysis of genetic, phenotypic and epidemio-follow-up studies. Our results showed that bacteria capable of producing bacterial blight symptoms of rice in Africa form a species complex composed mainly of P. ananatis, P. stewartii and P. agglomerans. Different types of diagnostic tools and characterizations were then developed and validated. The results from the use of these tools helped to point out the presence of this bacterial complex in several African countries and to provide details on its geographical structure. Thus, in total, we diagnosed a bacterial species complex, phytopathogenic of rice in 11 African countries (Benin, Burkina Faso, Burundi, Ghana, Ivory Coast, Mali, Niger, Nigeria, Senegal, Tanzania, Togo). In addition, analyzes of three genomes of african P. ananatis and the development, evaluation, and application of Multiple Locus VNTR Analysis (MLVA) tools provided insights into the phylogenetic and phylogenomic relationships that exist between P. ananatis strains isolated from rice and strains from other sources (plants, animals and environment). Indeed, preliminary results showed that several strains of P. ananatis isolated from rice in Africa, Asia and Europe were phylogenetically linked and formed a group that differentiated them from P. ananatis from other sources. In conclusion, the results of this thesis project provide a solid foundation that will facilitate future studies of Pantoea spp in Africa
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Libri sul tema "Pantoea"

1

Alonso, Sol. La Pantoja. 2a ed. Madrid: Ediciones Temas de Hoy, 1991.

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2

Rojão, Antonio Manuel Pantoja. Pantoja Rojão. Lisboa: Pandora, 1995.

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3

Pāntahʹā: Pantea. Tihrān: Intishārāt-i Samīr, 2011.

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4

The Panther family: Panther (type D, A, G), Panther command car, Panther observation car, pursuit Panther recovery Panther, further plans. West Chester, Pa: Schiffer Pub., 1990.

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5

Booth, Martin. Panther. London: Puffin, 1999.

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6

Pantera. Milano: Feltrinelli, 2014.

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7

Panther. Edinburgh: Payback Press, 1995.

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8

Trai͡anov, Teodor. Panteon. Sofii͡a: Izdatelska kŭshta "Anubis", 2000.

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9

Panther. New York: Margaret McElderry Books, 2001.

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10

A, Caras Roger. Panther! Lincoln: University of Nebraska Press, 1990.

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Capitoli di libri sul tema "Pantoea"

1

Achouak, W., G. Villemin, J. Balandreau e T. Heulin. "Specificity of root colonization by symplasmata-forming Pantoea agglomerans". In Biological Nitrogen Fixation Associated with Rice Production, 191–201. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8670-2_21.

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von Bodman, Susanne B., Aurelien L. Carlier e Ann M. Stevens. "Role of Quorum-Sensing Regulation in Pathogenesis of Pantoea stewartii subsp. stewartii". In Chemical Communication among Bacteria, 201–12. Washington, DC, USA: ASM Press, 2014. http://dx.doi.org/10.1128/9781555815578.ch13.

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3

Laux, P., G. Mao e W. Zeller. "Studies on the Mode of Action of Pantoea agglomerans 21889 Against Erwinia amylovora". In Plant Pathogenic Bacteria, 329–34. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0003-1_75.

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Ruppel, Silke, e Birgit Wernitz. "Quantifizierung und Monitoring von Pantoea agglomerans an Kohlrabi-Wurzeln und -Blättern mittels Real-time-PCR". In Wurzelinduzierte Bodenvorgänge, 56–61. Wiesbaden: Vieweg+Teubner Verlag, 2004. http://dx.doi.org/10.1007/978-3-322-80084-8_8.

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Merighi, M., D. R. Majerczak e D. L. Coplin. "The hrp genes of Pantoea stewartii are Regulated by a Complex System that Senses Environmental Signals". In Plant Pathogenic Bacteria, 201–4. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0003-1_45.

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Gitaitis, R., L. Zolobowska, S. Culpepper, H. Sanders, D. Langston e R. Walcott. "PCR Detection of the Onion Pathogen Pantoea ananatis on Various Weeds and Crops in Georgia, USA". In Plant Pathogenic Bacteria, 406–8. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0003-1_90.

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Völksch, B., e U. Sammer. "Characterization of the Inhibitory Strain Pantoea sp. 48b/90 with Potential as a Biocontrol Agent for Bacterial Plant Pathogens". In Pseudomonas syringae Pathovars and Related Pathogens – Identification, Epidemiology and Genomics, 111–16. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6901-7_13.

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Liu, Huijie, Xueyan Xing, Fuping Lu e Yu Li. "Functional Modification of the Substrate-Binding Site for Isomaltulose Production Based on Predicted Structure of Sucrose Isomerase from Pantoea dispersa UQ68 J". In Lecture Notes in Electrical Engineering, 59–68. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4801-2_6.

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Gooch, Jan W. "Pantone Printing". In Encyclopedic Dictionary of Polymers, 516. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8392.

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Eisenberg, Cristina. "Jaguar (Panthera onca)". In The Carnivore Way, 217–40. Washington, DC: Island Press/Center for Resource Economics, 2014. http://dx.doi.org/10.5822/978-1-61091-208-2_10.

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Atti di convegni sul tema "Pantoea"

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Gilvanova, E. A., e P. Yu Milman. "Auxin and carotene biosynthesis by the bacterium Pantoea agglomerans". In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.086.

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Monitoring of auxin and carotene during cultivation of the Pantoea agglomerans strain IB-BF revealed that the maximum yield of the target products is provided not by population density, but by the qualitative composition of the nutrient medium and the need for a larger peptide component of the substrate (rich amino acid set), which is part of the standard LB medium.
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Karagöz, Kenan. "In-vitro inhibiton of Pantoea ananatis by antagonistic bacteria". In II. INTERNATIONAL CONFERENCE ON ADVANCES IN NATURAL AND APPLIED SCIENCES: ICANAS 2017. Author(s), 2017. http://dx.doi.org/10.1063/1.4981714.

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Almeida, F. C. G., C. I. M. Lins, A. M. Vieira, C. J. Vilar, M. C. Mota Lins, G. M. Campos-Takaki e E. B. Tambourgi. "Biosurfactant production by Pantoea sp in submerged fermentation using pineapple peel as an alternative medium". In MICROBES IN APPLIED RESEARCH - Current Advances and Challenges. WORLD SCIENTIFIC, 2012. http://dx.doi.org/10.1142/9789814405041_0070.

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Prokopovich, P., S. Perni, X. T. Deng, G. Shama e M. G. Kong. "Evidence of mass transfer limitation in the inactivation of pantoea agglomerans biofilms with atmospheric cold gas plasma". In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383782.

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Helfman, J. I. "Panther". In the SIGCHI/GI conference. New York, New York, USA: ACM Press, 1987. http://dx.doi.org/10.1145/29933.275643.

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Zhang, Jing, Jie Tang, Cong Ma, Hanghang Tong, Yu Jing e Juanzi Li. "Panther". In KDD '15: The 21th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining. New York, NY, USA: ACM, 2015. http://dx.doi.org/10.1145/2783258.2783267.

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Денисова, Елена Валерьевна, e Наталья Александровна Веселова. "IMPACT OF ZOO VISITORS ON THE BEHAVIOR OF PERSIAN LIONS PANTHERA LEO PERSICA AND AMUR LEOPARD PANTHERA PARDUS ORIENTALIS". In Фундаментальные и прикладные исследования. Актуальные проблемы и достижения: сборник избранных статей Всероссийской (национальной) научной конференции (Санкт-Петербург, Декабрь 2020). Crossref, 2020. http://dx.doi.org/10.37539/fipi312.2020.95.37.002.

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В исследовании проанализированы поведенческие реакции азиатских львов Panthera leo persica и дальневосточного леопарда Panthera pardus orientalis на присутствие разного количества посетителей, их воздействие на животных, а также характер использования пространства вольера в Московском зоопарке. The study analyzed data on the behavioral responses of Persian lions Panthera leo persica and Amur leopard Panthera pardus orientalis to the number of visitors, the impact of visitors on the animals themselves, and the use of aviary space in the Moscow Zoo.
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Gumelar, Adipati Rahmat, Rudhy Akhwady e Abimanyu Takdir Alamsyah. "Pantura Water Quality". In the 2018 8th International Conference. New York, New York, USA: ACM Press, 2018. http://dx.doi.org/10.1145/3180382.3180397.

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Venkataramanujam, Venkatesh, e Pierre Larochelle. "Panther Peer: A Web-Based Tool for Peer and Self Evaluation". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63807.

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Panther Peer is a novel web based tool for peer evaluation. It has been developed at the Florida Institute of Technology to enable students (specifically those involved in capstone design projects) to give one another anonymous feedback on their team performance. Panther Peer is simple to implement and completely automated. Panther Peer automates the process of peer evaluation and minimizes the workload for both instructors and students. With the benefits of automation students can gain feedback more quickly. Moreover, the reduction in workload for course instructors enables them to encourage peer evaluations. The primary advantage of this system is the feedback students receive from their peers which helps them identify their weaknesses and focus on their strengths. The automated process means that the collection and dissemination of information is highly efficient. From the peer evaluations by students, instructors can have a fair idea about the teams progress and intervene where deemed necessary.
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Milligan, M. R. "Panther River Well Stimulations: A Case History". In Annual Technical Meeting. Petroleum Society of Canada, 1988. http://dx.doi.org/10.2118/88-39-51.

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Rapporti di organizzazioni sul tema "Pantoea"

1

Rule, Jana /Kesavan, Bronk Ana M. e Burt V. Investigation of Viability of Pantoea agglomerans (Formerly Erwinia herbicola) After Aerosolization From Media Containing Enriching and Coating Chemicals. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2008. http://dx.doi.org/10.21236/ada479606.

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Rintoul, Mark Daniel, Andrew T. Wilson, Christopher G. Valicka, W. Philip Kegelmeyer, Timothy M. Shead, Benjamin D. Newton e Kristina Rodriguez Czuchlewski. PANTHER. Trajectory Analysis. Office of Scientific and Technical Information (OSTI), settembre 2015. http://dx.doi.org/10.2172/1221864.

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3

Coram, Jamie L., James D. Morrow e David Nikolaus Perkins. The PANTHER User Experience. Office of Scientific and Technical Information (OSTI), settembre 2015. http://dx.doi.org/10.2172/1221178.

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Miller, Jacob K. Pantex Forklift Field Measurement Report. Office of Scientific and Technical Information (OSTI), marzo 2019. http://dx.doi.org/10.2172/1544967.

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Chen, K. C., e K. O. Merewether. Pantex lightning study recommendations report. Office of Scientific and Technical Information (OSTI), dicembre 1993. http://dx.doi.org/10.2172/10115273.

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Snyder, S. F. Pantex Plant meteorological monitoring program. Office of Scientific and Technical Information (OSTI), luglio 1993. http://dx.doi.org/10.2172/10176440.

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Reiser, Dudley W. Panther Creek, Idaho, Habitat Rehabilitation, Final Report. Office of Scientific and Technical Information (OSTI), gennaio 1986. http://dx.doi.org/10.2172/5327260.

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Madden, M. S., M. D. Adickes, C. J. Hostick, S. M. Nealey e B. W. Smith. Pantex staging study near-term alternatives. Office of Scientific and Technical Information (OSTI), dicembre 1992. http://dx.doi.org/10.2172/7008619.

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Madden, M. S., M. D. Adickes, C. J. Hostick, S. M. Nealey e B. W. Smith. Pantex staging study near-term alternatives. Office of Scientific and Technical Information (OSTI), dicembre 1992. http://dx.doi.org/10.2172/10110644.

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Abdo, Ronna. Final Pantex Report - 2006 [Phase 1 plan for assessment of Former Workers at the Pantex Facility]. Office of Scientific and Technical Information (OSTI), luglio 2013. http://dx.doi.org/10.2172/1088383.

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