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https://www.readbyqxmd.com/read/29332375/recurrent-aphtous-stomatitis
#1
Luca Giannetti, Alberto Murri Dello Diago, Lorenzo Lo Muzio
Recurrent aphtous stomatitis (RAS; recurrent aphtous ulcers, canker sores) is the most common ulcerative disease of the oral mucosa. In this paper we presented the main clinical features, epidemiologic data, etiopathogenetic factors and clinical management, based on the current medical literature reports.
January 11, 2018: Minerva Stomatologica
https://www.readbyqxmd.com/read/29331375/xanthomonas-tal-effectors-hijack-host-basal-transcription-factor-iia-%C3%AE-and-%C3%AE-subunits-for-invasion
#2
Ling Ma, Qiang Wang, Meng Yuan, Tingting Zou, Ping Yin, Shiping Wang
The Xanthomonas genus includes Gram-negative plant-pathogenic bacteria, which infect a broad range of crops and wild plant species, cause symptoms with leaf blights, streaks, spots, stripes, necrosis, wilt, cankers and gummosis on leaves, stems and fruits in a wide variety of plants via injecting their effector proteins into the host cell during infection. Among these virulent effectors, transcription activator-like effectors (TALEs) interact with the γ subunit of host transcription factor IIA (TFIIAγ) to activate the transcription of host disease susceptibility genes...
January 10, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29321892/regional-patterns-of-declining-butternut-juglans-cinerea-l-suggest-site-characteristics-for-restoration
#3
Randall S Morin, Kurt W Gottschalk, Michael E Ostry, Andrew M Liebhold
Butternut trees dying from a canker disease were first reported in southwestern Wisconsin in 1967. Since then, the disease has caused extensive mortality of butternut throughout its North American range. The objectives of this study were to quantify changes in butternut populations and density across its range and identify habitat characteristics of sites where butternut is surviving in order to locate regions for potential butternut restoration. The natural range of butternut (Juglans cinerea L.) extends over a large region of eastern N...
January 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29318913/evaluation-of-two-decades-of-cryphonectria-parasitica-hypovirus-introduction-in-an-american-chestnut-stand-in-wisconsin
#4
Mark L Double, Andrew M Jarosz, Dennis W Fulbright, Anita Davelos Baines, William Lloyd MacDonald
Hypovirus-infected Cryphonectria parasitica strains were introduced in a large stand of American chestnut (> 4000 individuals) in western Wisconsin (USA) to evaluate whether hypoviruses can serve as biological control agents. They were deployed by treating cankers from 1992-1997 and again from 2004-2014. After 17 years of hypovirus introductions within an area of the stand with the longest history of disease, isolation of hypovirus-infected strains increased from 55% in 1994 to 86% in 2014 from cankers that were treated...
January 10, 2018: Phytopathology
https://www.readbyqxmd.com/read/29305184/bactericidal-effect-of-silver-nanoparticles-against-the-propagation-of-clavibacter-michiganensis-infection-in-lycopersicon-esculentum-mill
#5
Raymundo Rene Rivas-Cáceres, Jose LuisStephano-Hornedo, Lugo Jorge, Vaca Rocio, Pedro Del Aguila, Gustavo Yañez-Ocampo, Martha Elena Mora-Herrera, Luis Miguel Camacho Díaz, Moisés Cipriano-Salazar, Peter Adeniyi Alaba
This study explored the use of silver nanoparticle as a bactericidal against the propagation of Clavibacter michiganensis onto tomatoes (Lycopersicon esculentum Mill). In Mexico, tomato production covers about 73% of the total vegetable production but it is affected by outbreak of bacteria canker caused by Clavibacter michiganensis subspecies michiganensis (Cmm). Silver ions are possess inhibitor properties, bactericides and high specter antimicrobials. In this study, 6 groups of culture were prepared using 6 different petri dishes where silver nanoparticles of varying concentrations (120, 84, 48, 24, 12 and 0 μg) were added...
January 2, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29304036/a-novel-molecular-toolkit-for-rapid-detection-of-the-pathogen-and-primary-vector-of-thousand-cankers-disease
#6
Emel Oren, William Klingeman, Romina Gazis, John Moulton, Paris Lambdin, Mark Coggeshall, Jiri Hulcr, Steven J Seybold, Denita Hadziabdic
Thousand Cankers Disease (TCD) of Juglans and Pterocarya (Juglandaceae) involves a fungal pathogen, Geosmithia morbida, and a primary insect vector, Pityophthorus juglandis. TCD was described originally from dying Juglans nigra trees in the western United States (USA), but it was reported subsequently from the eastern USA and northern Italy. The disease is often difficult to diagnose due to the absence of symptoms or signs on the bark surface of the host. Furthermore, disease symptoms can be confused with those caused by other biotic and abiotic agents...
2018: PloS One
https://www.readbyqxmd.com/read/29301493/pacbio-sequencing-of-copper-tolerant-xanthomonas-citri-reveals-presence-of-a-chimeric-plasmid-structure-and-provides-insights-into-reassortment-and-shuffling-of-transcription-activator-like-effectors-among-x-citri-strains
#7
Alberto M Gochez, Jose C Huguet-Tapia, Gerald V Minsavage, Deepak Shantaraj, Neha Jalan, Annett Strauß, Thomas Lahaye, Nian Wang, Blanca I Canteros, Jeffrey B Jones, Neha Potnis
BACKGROUND: Xanthomonas citri, a causal agent of citrus canker, has been a well-studied model system due to recent availability of whole genome sequences of multiple strains from different geographical regions. Major limitations in our understanding of the evolution of pathogenicity factors in X. citri strains sequenced by short-read sequencing methods have been tracking plasmid reshuffling among strains due to inability to accurately assign reads to plasmids, and analyzing repeat regions among strains...
January 4, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29295539/identification-of-inhibitors-targeting-ferredoxin-nadp%C3%A2-%C2%BA-reductase-from-the-xanthomonas-citri-subsp-citri-phytopathogenic-bacteria
#8
Marta Martínez-Júlvez, Guillermina Goñi, Daniel Pérez-Amigot, Rubén Laplaza, Irina Alexandra Ionescu, Silvana Petrocelli, María Laura Tondo, Javier Sancho, Elena G Orellano, Milagros Medina
Ferredoxin-NADP(H) reductases (FNRs) deliver NADPH or low potential one-electron donors to redox-based metabolism in plastids and bacteria. Xanthomonas citri subsp. citri (Xcc) is a Gram-negative bacterium responsible for citrus canker disease that affects commercial citrus crops worldwide. The Xcc fpr gene encodes a bacterial type FNR (XccFPR) that contributes to the bacterial response to oxidative stress conditions, usually found during plant colonization. Therefore, XccFPR is relevant for the pathogen survival and its inhibition might represent a strategy to treat citrus canker...
December 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29247246/new-microsatellite-markers-for-population-studies-of-phytophthora-cinnamomi-an-important-global-pathogen
#9
J Engelbrecht, T A Duong, N V D Berg
Phytophthora cinnamomi is the causal agent of root rot, canker and dieback of thousands of plant species around the globe. This oomycete not only causes severe economic losses but also threatens natural ecosystems. In South Africa, P. cinnamomi affects eucalyptus, avocado, macadamia and indigenous fynbos. Despite being one of the most important plant pathogens with a global distribution, little information is available regarding origin, invasion history and population biology. This is partly due to the limited number of molecular markers available for studying P...
December 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29242778/emerging-citrus-diseases-in-europe-caused-by-species-of-diaporthe
#10
Vladimiro Guarnaccia, Pedro W Crous
Species of Diaporthe are considered important plant pathogens, saprobes, and endophytes on a wide range of plant hosts. Several species are well-known on citrus, either as agents of pre- or post-harvest infections, such as dieback, melanose and stem-end rot on fruit. In this study we explored the occurrence, diversity and pathogenicity of Diaporthe species associated with Citrus and allied genera in European orchards, nurseries, and gardens. Surveys were carried out during 2015 and 2016 in Greece, Italy, Malta, Portugal, and Spain...
December 2017: IMA Fungus
https://www.readbyqxmd.com/read/29240520/draft-whole-genome-sequence-analyses-on-pseudomonas-syringae-pv-actinidiae-hr-negative-strains-detected-from-kiwifruit-bleeding-sap-samples
#11
Enrico Biondi, Alan Zamorano, Ernesto Vega, Stefano Ardizzi, Davide Sitta, Roberto De Salvador, Reinaldo Campos-Vargas, Claudio Meneses, Set Pérez, Assunta Bertaccini, Nicola Fiore
Kiwifruit bleeding sap samples, collected in Italian and Chilean orchards from symptomatic and asymptomatic plants, were evaluated for the presence of Pseudomonas syringae pv. actinidiae, the causal agent of bacterial canker. The saps were sampled during the spring of both hemispheres, before the bud sprouting, during the optimal time window for the collection of an adequate volume of sample for the early detection of the pathogen, preliminarily by molecular assays, and then, through its direct isolation and identification...
December 14, 2017: Phytopathology
https://www.readbyqxmd.com/read/29238278/role-of-metcalfa-pruinosa-as-a-vector-for-pseudomonas-syringae-pv-actinidiae
#12
Irene Donati, Sofia Mauri, Giampaolo Buriani, Antonio Cellini, Francesco Spinelli
After 20 years of steady increase, kiwifruit industry faced a severe arrest due to the pandemic spread of the bacterial canker, caused by Pseudomonas syringae pv. actinidiae (Psa). The bacterium penetrates the host plant primarily via natural openings or wounds, and its spread is mainly mediated by atmospheric events and cultural activities. Since the role of sucking insects as vectors of bacterial pathogens is widely documented, we investigated the ability of Metcalfa pruinosa Say (1830), one of the most common kiwifruit pests, to transmit Psa to healthy plants in laboratory conditions...
December 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/29187634/evidence-based-controls-for-epidemics-using-spatio-temporal-stochastic-models-in-a-bayesian-framework
#13
Hola K Adrakey, George Streftaris, Nik J Cunniffe, Tim R Gottwald, Christopher A Gilligan, Gavin J Gibson
The control of highly infectious diseases of agricultural and plantation crops and livestock represents a key challenge in epidemiological and ecological modelling, with implemented control strategies often being controversial. Mathematical models, including the spatio-temporal stochastic models considered here, are playing an increasing role in the design of control as agencies seek to strengthen the evidence on which selected strategies are based. Here, we investigate a general approach to informing the choice of control strategies using spatio-temporal models within the Bayesian framework...
November 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29186370/comparative-genomics-of-pathogenic-and-non-pathogenic-beetle-vectored-fungi-in-the-genus-geosmithia
#14
Taruna A Schuelke, Guangxi Wu, Anthony Westbrook, Keith Woeste, David C Plachetzki, Kirk Broders, Matthew D MacManes
Geosmithia morbida is an emerging fungal pathogen which serves as a model for examining the evolutionary processes behind pathogenicity because it is one of two known pathogens within a genus of mostly saprophytic, beetle-associated, fungi. This pathogen causes thousand cankers disease in black walnut trees and is vectored into the host via the walnut twig beetle. G. morbida was first detected in western US and currently threatens the timber industry concentrated in eastern US. We sequenced the genomes of G...
November 23, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29186190/the-sentinel-tree-nursery-as-an-early-warning-system-for-pathway-risk-assessment-fungal-pathogens-associated-with-chinese-woody-plants-commonly-shipped-to-europe
#15
Anna Maria Vettraino, Hong-Mei Li, Rene Eschen, Carmen Morales-Rodriguez, Andrea Vannini
Introduction of and invasion by alien plant pathogens represents the main cause of emerging infectious diseases affecting domesticated and wild plant species worldwide. The trade in living plants is the most common pathway of introduction. Many of the alien tree pathogens recently introduced into Europe were not previously included on any quarantine lists. To help determine the potential risk of pest introduction through trading of ornamental plants, a sentinel nursery was established in Beijing, China in 2008...
2017: PloS One
https://www.readbyqxmd.com/read/29163628/a-conserved-basal-transcription-factor-is-required-for-the-function-of-diverse-tal-effectors-in-multiple-plant-hosts
#16
Renyan Huang, Shugang Hui, Meng Zhang, Pei Li, Jinghua Xiao, Xianghua Li, Meng Yuan, Shiping Wang
Many Xanthomonas bacteria use transcription activator-like effector (TALE) proteins to activate plant disease susceptibility (S) genes, and this activation contributes to disease. We recently reported that rice basal transcription factor IIA gamma subunit, OsTFIIAγ5, is hijacked by TALE-carrying Xanthomonas oryzae infecting the plants. However, whether TFIIAγs are also involved in TALE-carrying Xanthomonas-caused diseases in other plants is unknown. Here, molecular and genetic approaches were used to investigate the role of TFIIAγs in other plants...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29163601/genome-wide-constitutively-expressed-gene-analysis-and-new-reference-gene-selection-based-on-transcriptome-data-a-case-study-from-poplar-canker-disease-interaction
#17
Jiaping Zhao, Fan Yang, Jinxia Feng, Yanli Wang, Barbara Lachenbruch, Jiange Wang, Xianchong Wan
A number of transcriptome datasets for differential expression (DE) genes have been widely used for understanding organismal biology, but these datasets also contain untapped information that can be used to develop more precise analytical tools. With the use of transcriptome data generated from poplar/canker disease interaction system, we describe a methodology to identify candidate reference genes from high-throughput sequencing data. This methodology will improve the accuracy of RT-qPCR and will lead to better standards for the normalization of expression data...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29158527/azole-sensitivity-in-leptosphaeria-pathogens-of-oilseed-rape-the-role-of-lanosterol-14%C3%AE-demethylase
#18
Thomas R Sewell, Nichola J Hawkins, Henrik U Stotz, YongJu Huang, Steven L Kelly, Diane E Kelly, Bart Fraaije, Bruce D L Fitt
Lanosterol 14-α demethylase is a key enzyme intermediating the biosynthesis of ergosterol in fungi, and the target of azole fungicides. Studies have suggested that Leptosphaeria maculans and L. biglobosa, the causal agents of phoma stem canker on oilseed rape, differ in their sensitivity to some azoles, which could be driving pathogen frequency change in crops. Here we used CYP51 protein modelling and heterologous expression to determine whether there are interspecific differences at the target-site level...
November 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29148926/identification-of-gene-candidates-associated-with-huanglongbing-tolerance-using-candidatus-liberibacter-asiaticus-flagellin-22-as-a-proxy-to-challenge-citrus
#19
Qingchun Shi, Vicente J Febres, Shujian Zhang, Fahong Yu, Greg McCollum, David G Hall, Gloria A Moore, Ed Stover
The 22-amino acid (flg22) pathogen-associated molecular pattern from the flagellin of Xanthomonas citri subsp. citri has been shown to induce defense responses correlated with citrus canker resistance. Here, flg22 of 'Candidatus Liberibacter asiaticus', the putative causal agent of Huanglongbing (HLB), elicited differential defense responses that were weaker than those from Xcc-flg22, between those of the HLB-tolerant mandarin cultivar Sun Chu Sha and susceptible grapefruit cultivar Duncan. Transcriptomics was used to compare the effect of CLas-flg22 and Xcc-flg22 between the citrus genotypes and identified 86 genes induced only by CLas-flg22 in the tolerant mandarin...
November 17, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29146856/complete-genome-sequence-of-xanthomonas-campestris-pv-viticola-strain-ccrmxcv-80-from-brazil
#20
Nelson B Lima, Marco A S Gama, Rosa L R Mariano, Wilson J Silva, Antônio R G Farias, Raul M Falcão, Lucas C Sousa-Paula, Ana M Benko-Iseppon, Sérgio S L Paiva, Valdir Q Balbino, Elineide B Souza
Here, we report the complete 5.3-Mb genome sequence of Xanthomonas campestris pv. viticola (CCRMXCV 80), which causes grapevine (Vitis vinifera L.) bacterial canker. Genome data will improve our understanding of the strain's comparative genomics and epidemiology, and help to further define plant protection and quarantine procedures.
November 16, 2017: Genome Announcements
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