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https://www.readbyqxmd.com/read/28811761/incidence-rates-of-major-diseases-of-kiwiberry-in-2015-and-2016
#1
Gyoung Hee Kim, Deok Ryong Kim, Sook-Young Park, Young Sun Lee, Jae Sung Jung, Young Jin Koh
Incidence rates of diseases in kiwiberry orchards were investigated monthly from late June to late September in Gwangyang and Boseong in 2015 and 2016. The impact of postharvest fruit rot was investigated during ripening after harvest. Bacterial canker was only observed on one single tree in 2015, but black rot, powdery mildew, leaf spot and blight, and postharvest fruit rot diseases were problematic throughout the study period in both 2015 and 2016. Incidence rates of the diseases varied with kiwiberry cultivar, region and sampling time...
August 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28811752/occurrence-and-epidemics-of-bacterial-canker-of-kiwifruit-in-korea
#2
REVIEW
Gyoung Hee Kim, Jae Sung Jung, Young Jin Koh
Bacterial canker is the largest limiting factor in the cultivation and production of kiwifruit worldwide. Typical symptoms comprise necrotic spots on leaves, canker and dieback on canes and trunks, twig wilting, and blossom necrosis. Pseudomonas syringae pv. actinidiae (Psa), which is the causal agent of kiwifruit bacterial canker, is divided into four biovars based on multilocus sequence analysis of different genes, additional PCR testing of pathogenic genes (argKtox cluster, cfl, and various effector genes), and biochemical and physiological characterization...
August 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28781084/crystal-structure-and-regulation-of-the-citrus-pol-iii-repressor-maf1-by-auxin-and-phosphorylation
#3
Adriana Santos Soprano, Priscila Oliveira de Giuseppe, Hugo Massayoshi Shimo, Tatiani Brenelli Lima, Fernanda Aparecida Heleno Batista, Germanna Lima Righetto, José Geraldo de Carvalho Pereira, Daniela Campos Granato, Andrey Fabricio Ziem Nascimento, Fabio Cesar Gozzo, Paulo Sérgio Lopes de Oliveira, Ana Carolina Migliorini Figueira, Juliana Helena Costa Smetana, Adriana Franco Paes Leme, Mario Tyago Murakami, Celso Eduardo Benedetti
MAF1 is the main RNA polymerase (Pol) III repressor that controls cell growth in eukaryotes. The Citrus ortholog, CsMAF1, was shown to restrict cell growth in citrus canker disease but its role in plant development and disease is still unclear. We solved the crystal structure of the globular core of CsMAF1, which reveals additional structural elements compared with the previously available structure of hMAF1, and explored the dynamics of its flexible regions not present in the structure. CsMAF1 accumulated in the nucleolus upon leaf excision, and this translocation was inhibited by auxin and by mutation of the PKA phosphorylation site, S45, to aspartate...
July 24, 2017: Structure
https://www.readbyqxmd.com/read/28769912/xanthomonas-citri-minc-oscillates-from-pole-to-pole-to-ensure-proper-cell-division-and-shape
#4
André S G Lorenzoni, Giordanni C Dantas, Tessa Bergsma, Henrique Ferreira, Dirk-Jan Scheffers
Xanthomonas citri (Xac) is the causal agent of citrus canker, a disease that affects citrus crops and causes economic impact worldwide. To further characterize cell division in this plant pathogen, we investigated the role of the protein MinC in cell division, chromosome segregation, and peptidoglycan incorporation by deleting the gene minC using allele exchange. Xac with minC deleted exhibited the classic Δmin phenotype observed in other bacteria deleted for min components: minicells and short filamentation...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28717603/isolated-limb-perfusion-electrochemotherapy-for-the-treatment-of-an-advanced-squamous-cell-carcinoma-of-the-hoof-in-a-mare
#5
Enrico Pierluigi Spugnini, Carlo Bolaffio, Licia Scacco, Alfonso Baldi
A twenty-year-old female saddle horse was referred for evaluation of a seven month, non-healing erosive lesion of the right hind hoof with proliferation and bleeding of the underlying soft tissues. This lesion had been twice surgically treated as a canker but rapidly recurred. Histological examination of the second excision revealed a well-differentiated squamous cell carcinoma. At presentation, the horse was mildly depressed, lame and partially non-weight-bearing on the right hind leg, which exhibited a 10 x 10 cm erosive and proliferative lesion remodeling the hoof...
2017: Open veterinary journal
https://www.readbyqxmd.com/read/28705973/complete-genome-sequences-of-three-xanthomonas-citri-strains-from-texas
#6
Alejandra Munoz Bodnar, Gem Santillana, Vessela Mavrodieva, Zhaowei Liu, Mark Nakhla, Dean W Gabriel
The complete genome sequences of three Xanthomonas citri strains isolated from lime trees in Texas were found to belong to the A(w) group. All carried nearly identical large plasmids with similarity to those of a citrus canker strain from India and to xanthomonads from Africa and Colombia. All three strains harbored unusual pthA homologs.
July 13, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28702038/neofusicoccum-parvum-colonization-of-the-grapevine-woody-stem-triggers-asynchronous-host-responses-at-the-site-of-infection-and-in-the-leaves
#7
Mélanie Massonnet, Rosa Figueroa-Balderas, Erin R A Galarneau, Shiho Miki, Daniel P Lawrence, Qiang Sun, Christopher M Wallis, Kendra Baumgartner, Dario Cantu
Grapevine trunk diseases cause important economic losses in vineyards worldwide. Neofusicoccum parvum, one of the most aggressive causal agents of the trunk disease Botryosphaeria dieback, colonizes cells and tissues of the grapevine wood, leading to the formation of an internal canker. Symptoms then extend to distal shoots, with wilting of leaves and bud mortality. Our aim was to characterize the transcriptional dynamics of grapevine genes in the woody stem and in the leaves during Neofusicoccum parvum colonization...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28699860/leucobacter-corticis-sp-nov-isolated-from-symptomatic-bark-of-populus-%C3%A3-euramericana-canker
#8
Yong Li, Wei Fang, Shou-Jiang Xie, Xuqi Yang, Lai-Fa Wang
A Gram-stain-positive, aerobic, non-motile, rod-shaped bacterial strain, designated 2C-7T, was isolated from symptomatic bark of a Populus × euramericana canker. Growth occurred between 10 and 37 °C and between pH 6 and 10, with optimal growth at 30 °C and pH 7.0-8.0. Growth was present under 0-8 % (w/v) salinity conditions (optimum 1-2 %). Growth occurred in the presence of 10 mM chromium (Cr6+). The major fatty acids (≥10 %) of the novel strain were anteiso-C15 : 0, anteiso-C17 : 0 and iso-C16 : 0...
July 12, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28693412/proteomics-based-identification-of-differentially-abundant-proteins-reveals-adaptation-mechanisms-of-xanthomonas-citri-subsp-citri-during-citrus-sinensis-infection
#9
Leandro M Moreira, Márcia R Soares, Agda P Facincani, Cristiano B Ferreira, Rafael M Ferreira, Maria I T Ferro, Fábio C Gozzo, Érica B Felestrino, Renata A B Assis, Camila Carrião M Garcia, João C Setubal, Jesus A Ferro, Julio C F de Oliveira
BACKGROUND: Xanthomonas citri subsp. citri (Xac) is the causal agent of citrus canker. A proteomic analysis under in planta infectious and non-infectious conditions was conducted in order to increase our knowledge about the adaptive process of Xac during infection. RESULTS: For that, a 2D-based proteomic analysis of Xac at 1, 3 and 5 days after inoculation, in comparison to Xac growth in NB media was carried out and followed by MALDI-TOF-TOF identification of 124 unique differentially abundant proteins...
July 11, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28690605/dicer-like-genes-are-required-for-h2o2-and-kcl-stress-responses-pathogenicity-and-small-rna-generation-in-valsa-mali
#10
Hao Feng, Ming Xu, Yangyang Liu, Ruqing Dong, Xiaoning Gao, Lili Huang
Valsa mali (V. mali) is the causative agent of apple tree Valsa canker, which heavily damages the production of apples in China. However, the biological roles of the RNA interfering (RNAi) pathway in the pathogenicity of V. mali remain unknown. Dicer-like proteins (DCLs) are important components that control the initiation of the RNAi pathway. In this study, VmDCL1 and VmDCL2 were isolated and functionally characterized in V. mali. VmDCL1 and VmDCL2 are orthologous in evolution to the DCLs in Cryphonectria parasitica...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28687784/whole-transcriptome-sequencing-of-pseudomonas-syringae-pv-actinidiae-infected-kiwifruit-plants-reveals-species-specific-interaction-between-long-non-coding-rna-and-coding-genes
#11
Zupeng Wang, Yifei Liu, Li Li, Dawei Li, Qiong Zhang, Yangtao Guo, Shuaibin Wang, Caihong Zhong, Hongwen Huang
An outbreak of kiwifruit bacterial canker disease caused by Pseudomonas syringae pv. actinidiae (Psa) beginning in 2008 caused disaster to the kiwifruit industry. However the mechanisms of interaction between kiwifruit and Psa are unknown. Long noncoding RNAs (lncRNAs) are known to regulate many biological processes, but comprehensive repertoires of kiwifruit lncRNAs and their effects on the interaction between kiwifruit and Psa are unknown. Here, based on in-depth transcriptomic analysis of four kiwifruit materials at three stages of infection with Psa, we identified 14,845 transcripts from 12,280 loci as putative lncRNAs...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28677494/genomic-analysis-of-clavibacter-michiganensis-reveals-insight-into-virulence-strategies-and-genetic-diversity-of-a-gram-positive-bacterial-pathogen
#12
Shree P Thapa, Sivakumar Pattathil, Michael Hahn, Marie-Agnès Jacques, Bob Gilbertson, Gitta Coaker
Clavibacter michiganensis subsp. michiganensis (Cmm) is a Gram-positive bacterial pathogen that proliferates in the xylem vessels of tomato, causing bacterial canker disease. In this study, we sequenced and assembled genomes of 11 Cmm strains isolated from infected tomato fields in California as well as five Clavibacter strains that colonize tomato endophytically but are not pathogenic in this host. The analysis of the Cmm genomes supported the monophyletic nature of this pathogen, but revealed genetic diversity among strains, consistent with multiple introduction events...
July 5, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28622496/equine-hoof-canker-cell-proliferation-and-morphology
#13
V Apprich, T Licka, N Zipfl, A Tichy, C Gabriel
Hoof canker is described as progressive pododermatitis of the equine hoof with absent epidermal cornification and extensive proliferation of the dermal papillary body; however, in-depth research on the type of proliferative activity has not yet been reported. The aim of the present study was to determine cell-specific proliferation patterns together with morphological analysis of hoof canker tissue. Tissues removed during surgery from 19 horses presented for treatment of canker were compared with similar postmortem tissues of healthy hooves of 10 horses...
July 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/28620210/a-bacterial-acetyltransferase-triggers-immunity-in-arabidopsis-thaliana-independent-of-hypersensitive-response
#14
Jay Jayaraman, Sera Choi, Maxim Prokchorchik, Du Seok Choi, Amandine Spiandore, Erik H Rikkerink, Matthew D Templeton, Cécile Segonzac, Kee Hoon Sohn
Type-III secreted effectors (T3Es) play critical roles during bacterial pathogenesis in plants. Plant recognition of certain T3Es can trigger defence, often accompanied by macroscopic cell death, termed the hypersensitive response (HR). Economically important species of kiwifruit are susceptible to Pseudomonas syringae pv. actinidiae (Psa), the causal agent of kiwifruit bacterial canker. Although Psa is non-pathogenic in Arabidopsis thaliana, we observed that a T3E, HopZ5 that is unique to a global outbreak clade of Psa, triggers HR and defence in Arabidopsis accession Ct-1...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28613977/the-scientific-economic-and-social-impacts-of-the-new-zealand-outbreak-of-bacterial-canker-of-kiwifruit-pseudomonas-syringae-pv-actinidiae
#15
Joel L Vanneste
The introduction of Pseudomonas syringae pv. actinidiae (Psa) severely damaged the New Zealand kiwifruit industry, which in 2010 was based on only two cultivars. Despite an extraordinarily quick and strong response by industry, government, and scientists to minimize the economic and social impacts, the economic consequences of this outbreak were severe. Although our understanding of Psa epidemiology and control methods increased substantively over the past six years, the kiwifruit industry largely recovered because of the introduction of a less-susceptible yellow-fleshed cultivar...
August 4, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28572833/development-of-high-throughput-methods-to-screen-disease-caused-by-rhizoctonia-solani-ag-2-1-in-oilseed-rape
#16
Fryni Drizou, Neil S Graham, Toby J A Bruce, Rumiana V Ray
BACKGROUND: Rhizoctonia solani (Kühn) is a soil-borne, necrotrophic fungus causing damping off, root rot and stem canker in many cultivated plants worldwide. Oilseed rape (OSR, Brassica napus) is the primary host for anastomosis group (AG) 2-1 of R. solani causing pre- and post-emergence damping-off resulting in death of seedlings and impaired crop establishment. Presently, there are no known resistant OSR genotypes and the main methods for disease control are fungicide seed treatments and cultural practices...
2017: Plant Methods
https://www.readbyqxmd.com/read/28562158/sulfate-binding-protein-sbp-from-xanthomonas-citri-structure-and-functional-insights
#17
Cristiane Tambascia Pereira, Cássia Roesler, Jéssica Nascimento Faria, Melissa Regina Fessel, Andrea Balan
The uptake and transport of sulfate in bacteria is mediated by an ATP-binding cassette transporter (ABC transporter) encoded by sbpcysUWA genes, whose importance has been widely demonstrated due to their relevance in cysteine synthesis and bacterial growth. In Xanthomonas citri, the causative agent of canker disease, the expression of components from this ABC transporter and others related to uptake of organic sulfur sources has been shown during in vitro growth cultures. In this work, based on gene reporter and proteomics analyses, we showed the activation of the promoter that controls the sbpcysUWA operon in vitro and in vivo and the expression of sulfate-binding protein (Sbp), a periplasmic-binding protein, indicating that this protein plays an important function during growth and that the transport system is active during Citrus sinensis infection...
July 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28510721/cold-tolerance-of-pityophthorus-juglandis-coleoptera-scolytidae-from-northern-california
#18
Andrea R Hefty, Steven J Seybold, Brian H Aukema, Robert C Venette
Winter survivorship of insects is determined by a combination of physiological, behavioral, and microhabitat characteristics. We characterized the cold tolerance of the walnut twig beetle, Pityophthorus juglandis Blackman, a domestic alien invasive bark beetle that vectors a phytopathogenic fungus. The beetle and fungus cause thousand cankers disease in species of Juglans and Pterocarya. The disease is spreading in the United States of America (USA) and Italy. Contact thermocouple thermometry was used to measure the supercooling points of adults and larvae and lower lethal temperatures of adults from a population from northern California...
May 16, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28476983/biosynthesis-of-silver-and-gold-nanoparticles-using-trichoderma-atroviride-for-the-biological-control-of-phomopsis-canker-disease-in-tea-plants
#19
Ponnusamy Ponmurugan
The biological way of metallic nanoparticles production using ecofriendly biocontrol agents are largely used to control many plant pathogenic microorganisms in agriculture. Hence, an attempt was made to evaluate the potential of suppressive activity of nanoparticles produced by an indigenous isolate, Trichoderma atroviride against a tea pathogenic fungus namely Phomopsis theae. The presence of biosynthesised nanoparticles was primarily confirmed through ultraviolet-visible spectroscopy analysis and was characterised using X-ray diffraction and scanning electron microscopy-energy dispersive X-ray analysis to delineate the size, shape and nature of particles...
April 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28454709/involvement-of-phenazine-1-carboxylic-acid-in-the-interaction-between-pseudomonas-chlororaphis-subsp-aureofaciens-strain-m71-and-seiridium-cardinale-in-vivo
#20
Aida Raio, Pierluigi Reveglia, Gerardo Puopolo, Alessio Cimmino, Roberto Danti, Antonio Evidente
Pseudomonas chlororaphis subsp. aureofaciens encompasses bacterial strains that effectively control phytopathogenic fungi through the production of the natural antibiotics named phenazines. In this work, the involvement of phenazine production in the interaction between the biological control agent P. chlororaphis subsp. aureofaciens M71 and the fungus Seiridium cardinale, a serious cypress pathogen, was investigated. Field trials were carried out to assess the role of phenazines in the control of S. cardinale in vivo...
June 2017: Microbiological Research
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