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https://www.readbyqxmd.com/read/28343961/protein-depletion-using-the-arabinose-promoter-in-xanthomonas-citri-subsp-citri
#1
Lilian A Lacerda, Lucia B Cavalca, Paula M M Martins, José S Govone, Maurício Bacci, Henrique Ferreira
Xanthomonas citri subsp. citri (X. citri) is a plant pathogen and the etiological agent of citrus canker, a severe disease that affects all the commercially important citrus varieties, and has worldwide distribution. Citrus canker cannot be healed, and the best method known to control the spread of X. citri in the orchards is the eradication of symptomatic and asymptomatic plants in the field. However, in the state of São Paulo, Brazil, the main orange producing area in the world, control is evolving to an integrated management system (IMS) in which growers have to use less susceptible plants, windshields to prevent bacterial spread out and sprays of cupric bactericidal formulations...
March 23, 2017: Plasmid
https://www.readbyqxmd.com/read/28338992/identification-of-the-eucalyptus-grandis-chitinase-gene-family-and-expression-characterization-under-different-biotic-stress-challenges
#2
Peri A Tobias, Nanette Christie, Sanushka Naidoo, David I Guest, Carsten Külheim
Eucalyptus grandis (W. Hill ex Maiden) is an Australian Myrtaceae tree grown for timber in many parts of the world and for which the annotated genome sequence is available. Known to be susceptible to a number of pests and diseases, E. grandis is a useful study organism for investigating defense responses in woody plants. Chitinases are widespread in plants and cleave glycosidic bonds of chitin, the major structural component of fungal cell walls and arthropod exoskeletons. They are encoded by an important class of genes known to be up-regulated in plants in response to pathogens...
March 13, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28336584/complete-genome-sequences-of-six-copper-resistant-xanthomonas-citri-pv-%C3%A2-citri-strains-causing-asiatic-citrus-canker-obtained-using-long-read-technology
#3
Damien Richard, Claudine Boyer, Christian Vernière, Blanca I Canteros, Pierre Lefeuvre, Olivier Pruvost
The gammaproteobacterium Xanthomonas citri pv. citri causes Asiatic citrus canker. Pathotype A strains have a broad host range, which includes most commercial citrus species, and they cause important economic losses worldwide. Control often relies on frequent copper sprays. We present here the complete genomes of six X. citri pv. citri copper-resistant strains.
March 23, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28334300/flight-capacity-of-the-walnut-twig-beetle-coleoptera-scolytidae-on-a-laboratory-flight-mill
#4
Aubree M Kees, Andrea R Hefty, Robert C Venette, Steven J Seybold, Brian H Aukema
The walnut twig beetle, Pityophthorus juglandis Blackman, and associated fungus Geosmithia morbida Kolařík, Freeland, Utley, & Tisserat constitute the insect-fungal complex that causes thousand cankers disease in walnut, Juglans spp., and wingnut, Pterocarya spp. Thousand cankers disease is responsible for the decline of Juglans species throughout the western United States and more recently, the eastern United States and northern Italy. We examined the flight capacity of P. juglandis over 24-h trials on a flight mill in the laboratory...
March 16, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28317539/botryosphaeriaceae-species-associated-with-dieback-and-canker-disease-of-bay-laurel-in-northern-california-with-the-description-of-dothiorella-californica-sp-nov
#5
Daniel P Lawrence, Francesca Peduto Hand, W Douglas Gubler, Florent P Trouillas
Members of the Botryosphaeriaceae are cosmopolitan fungi that may exist as seemingly innocuous endophytes or as destructive pathogens of numerous woody hosts, including fruit and nut crops, urban ornamental trees and shrubs, and forest trees. Surveys of bay laurel in northern California have revealed symptoms of dieback and branch canker of unknown aetiology. The goals of this study were to identify and clarify the species of Botryosphaeriaceae associated with these symptoms and to confirm their pathogenicity...
April 2017: Fungal Biology
https://www.readbyqxmd.com/read/28317538/families-genera-and-species-of-botryosphaeriales
#6
Tao Yang, Johannes Z Groenewald, Ratchadawan Cheewangkoon, Fahimeh Jami, Jafar Abdollahzadeh, Lorenzo Lombard, Pedro W Crous
Members of Botryosphaeriales are ecologically diverse, but most commonly associated with leaf spots, fruit and root rots, die-back or cankers of diverse woody hosts. Based on morphology and DNA sequence data, the Botryosphaeriales have to date been shown to contain eight families, with an additional two, Endomelanconiopsisaceae (Endomelanconiopsis) and Pseudofusicoccumaceae (Pseudofusicoccum) being newly described in this study. Furthermore, Oblongocollomyces is introduced as new genus, while Spencermartinsia is reduced to synonymy under Dothiorella...
April 2017: Fungal Biology
https://www.readbyqxmd.com/read/28299876/essential-oils-of-myrtaceae-species-growing-wild-in-tunisia-chemical-variability-and-antifungal-activity-against-biscogniauxia-mediterranea-the-causative-agent-of-charcoal-canker
#7
Islem Yangui, Meriem Zouaoui Boutiti, Mohamed Boussaid, Chokri Messaoud
The chemical composition of five Eucalyptus species and five Myrtus communis L. populations was investigated using GC-MS and GC-FID. For Eucalyptus essential oils, 32 compounds, representing 88.56-96.83% of the total oil according to species, were identified. The main compounds were 1,8-cineole, α-pinene, p-cymene, ɤ-gurjunene, α-aromadendrene and β-phellandrene. For Myrtle essential oils, 26 compounds, representing 93.13-98.91% of the total oil were identified. α-pinene, 1,8-cineole, linalool and myrtenyl acetate were found to be the major compounds...
March 16, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28284060/phosphite-shifts-physiological-and-hormonal-profile-of-monterey-pine-and-delays-fusarium-circinatum-progression
#8
Andreia Cerqueira, Artur Alves, Helder Berenguer, Barbara Correia, Aurelio Gómez-Cadenas, Julio Javier Diez, Pedro Monteiro, Glória Pinto
Fusarium circinatum is the causal agent of pitch canker disease affecting Pinus spp. and Pseudotsuga menziesii worldwide. Under strict quarantine measures, alternative approaches for disease control are necessary. Phosphite (Phi) salts are known for their fungicidal activity and as plant resistance elicitors; however, its potential is yet to be acknowledged in the Pinus-F. circinatum model. The main aim of this study was to assess whether the application of a Phi-based commercial formulation would delay the progression of the pitch canker on Pinus radiata plants, and on the in vitro fungal growth...
February 27, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28267786/g%C3%AE-proteins-gvm2-and-gvm3-regulate-vegetative-growth-asexual-development-and-pathogenicityon-apple-in-valsa-mali
#9
Na Song, Qingqing Dai, Baitao Zhu, Yuxing Wu, Ming Xu, Ralf Thomas Voegele, Xiaoning Gao, Zhensheng Kang, Lili Huang
In fungi, heterotrimeric guanine-nucleotide binding proteins (G-proteins) are key elements of signal transduction pathways, which control growth, asexual and sexual development, as well as virulence. In this study, we have identified two genes encoding heterotrimeric G protein alpha subunits, named Gvm2 and Gvm3, from Valsa mali, the causal agent of apple Valsa canker. Characterization of Gvm2 and Gvm3 mutants indicates that Gvm3 may be a crucial regulator of vegetative growth. Deletion of the corresponding gene results in a 20% reduction in growth rate...
2017: PloS One
https://www.readbyqxmd.com/read/28258140/ecological-and-evolutionary-insights-into-pathovar-diversity-of-xanthomonas-citri
#10
Kanika Bansal, Samriti Midha, Sanjeet Kumar, Prabhu B Patil
Citrus canker, caused by Xanthomonas citri pv. citri (Xct), is a serious disease of citrus plants worldwide. Earlier phylogenetic studies using housekeeping genes revealed that Xct is related to many other pathovars, which can be collectively referred as Xanthomonas citri pathovars (XCPs). In the present study, we report the genome sequence of eighteen XCPs compared with four XCPs available in the public domain. In a tree based on phylogenomic marker genes, all the XCPs form a monophyletic cluster suggesting their origin from a common ancestor...
March 3, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28249011/transposon-insertion-libraries-for-the-characterization-of-mutants-from-the-kiwifruit-pathogen-pseudomonas-syringae-pv-actinidiae
#11
Carl H Mesarich, Jonathan Rees-George, Paul P Gardner, Fatemeh Ashari Ghomi, Monica L Gerth, Mark T Andersen, Erik H A Rikkerink, Peter C Fineran, Matthew D Templeton
Pseudomonas syringae pv. actinidiae (Psa), the causal agent of kiwifruit canker, is one of the most devastating plant diseases of recent times. We have generated two mini-Tn5-based random insertion libraries of Psa ICMP 18884. The first, a 'phenotype of interest' (POI) library, consists of 10,368 independent mutants gridded into 96-well plates. By replica plating onto selective media, the POI library was successfully screened for auxotrophic and motility mutants. Lipopolysaccharide (LPS) biosynthesis mutants with 'Fuzzy-Spreader'-like morphologies were also identified through a visual screen...
2017: PloS One
https://www.readbyqxmd.com/read/28228472/unconventional-recombination-in-the-mating-type-locus-of-heterothallic-apple-canker-pathogen-valsa-mali
#12
Zhiyuan Yin, Xiwang Ke, Zhengpeng Li, Jiliang Chen, Xiaoning Gao, Lili Huang
Sexual reproduction in filamentous ascomycetes is controlled by mating type (MAT) locus, including two idiomorphs MAT1-1 and MAT1-2 Understanding the MAT locus can provide clues for unveiling the sexual development and virulence factors for fungal pathogens. The genus Valsa (Sordariomycetes, Diaporthales) contains many tree pathogens responsible for destructive canker diseases. Sexual stage of these ascomycetes is occasionally observed in nature and no MAT locus has been reported up till now. Thus, we identified the MAT locus of apple canker pathogen V...
February 21, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28194866/pseudomonas-protegens-cs1-from-the-lemon-phyllosphere-as-a-candidate-for-citrus-canker-biocontrol-agent
#13
G Michavila, C Adler, P R De Gregorio, M J Lami, M C Caram Di Santo, A M Zenoff, R E de Cristobal, P A Vincent
Citrus canker is a worldwide-distributed disease caused by Xanthomonas citri subsp. citri. One of the most used strategies to control the disease is centered on copper-based compounds that cause environmental problems. Therefore, it is of interest to develop new strategies to manage the disease. Previously, we reported the ability of the siderophore pyochelin, produced by the opportunistic human pathogen Pseudomonas aeruginosa, to inhibit in vitro several bacterial species including X. citri subsp. citri. The action mechanism, addressed with the model bacterium Escherichia coli, was connected to the generation of reactive oxygen species...
February 14, 2017: Plant Biology
https://www.readbyqxmd.com/read/28192454/incorporating-exposure-to-pitch-canker-disease-to-support-management-decisions-of-pinus-pinaster-ait-in-the-face-of-climate-change
#14
María Jesús Serra-Varela, Ricardo Alía, Javier Pórtoles, Julián Gonzalo, Mario Soliño, Delphine Grivet, Rosa Raposo
Climate change is gravely affecting forest ecosystems, resulting in large distribution shifts as well as in increasing infection diseases and biological invasions. Accordingly, forest management requires an evaluation of exposure to climate change that should integrate both its abiotic and biotic components. Here we address the implications of climate change in an emerging disease by analysing both the host species (Pinus pinaster, Maritime pine) and the pathogen's (Fusarium circinatum, pitch canker) environmental suitability i...
2017: PloS One
https://www.readbyqxmd.com/read/28186388/xanthomonas-citri-pv-citri-pathotypes-lps-structure-and-function-as-microbe-associated-molecular-patterns
#15
Flaviana Di Lorenzo, Alba Silipo, Lotte Bettina Andersen Gersby, Angelo Palmigiano, Rosa Lanzetta, Domenico Garozzo, Claudine Boyer, Olivier Pruvost, Mari-Anne Newman, Antonio Molinaro
Xanthomonas citri pv. citri is the pathogen responsible for Asiatic citrus canker, one of the most serious citrus diseases worldwide. The lipopolysaccharide (LPS) molecule has been demonstrated to be involved in X. citri pv. citri virulence. Despite enormous progress in investigations of the molecular mechanisms for bacterial pathogenicity, determination of the detailed LPS structure-activity relationship is limited, as the current knowledge is mainly based on structural determination of one X. citri pv...
February 10, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28176454/saturated-genic-snp-mapping-identified-functional-candidates-and-selection-tools-for-the-pinus-monticola-cr2-locus-controlling-resistance-to-white-pine-blister-rust
#16
Jun-Jun Liu, Richard A Sniezko, Arezoo Zamany, Holly Williams, Ning Wang, Angelia Kegley, Douglas P Savin, Hao Chen, Rona N Sturrock
Molecular breeding incorporates efficient tools to increase rust resistance in five-needle pines. Susceptibility of native five-needle pines to white pine blister rust (WPBR), caused by the non-native invasive fungus Cronartium ribicola (J.C.Fisch.), has significantly reduced wild populations of these conifers in North America. Major resistance (R) genes against specific avirulent pathotypes have been found in several five-needle pine species. In this study we screened genic SNP markers by comparative transcriptome and genetic association analyses and constructed saturated linkage maps for the western white pine (Pinus monticola) R locus (Cr2)...
February 7, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28167892/selection-of-small-synthetic-antimicrobial-peptides-inhibiting-xanthomonas-citri-subsp-citri-causing-citrus-canker
#17
Jeahyuk Choi, Euiho Park, Se-Weon Lee, Jae-Wook Hyun, Kwang-Hyun Baek
Citrus canker disease decreases the fruit quality and yield significantly, furthermore, emerging of streptomycin-resistant pathogens threatens the citrus industry seriously because of a lack of proper control agents. Small synthetic antimicrobial peptides (AMPs) could be a promising alternative. Fourteen hexapeptides were selected by using positional scanning of synthetic peptide combinatorial libraries. Each hexapeptide showed different antimicrobial spectrum against Bacillus, Pseudomonas, Xanthomonas, and Candida species...
February 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28160497/unusual-evolutionary-mechanisms-to-escape-effector-triggered-immunity-in-the-fungal-phytopathogen-leptosphaeria-maculans
#18
C Plissonneau, F Blaise, B Ollivier, M Leflon, J Carpezat, T Rouxel, M-H Balesdent
Leptosphaeria maculans is the fungus responsible for the stem canker disease of oilseed rape (Brassica napus). AvrLm3 and AvrLm4-7, two avirulence effector genes of L. maculans, are involved in an unusual relationship: AvrLm4-7 suppresses the Rlm3-mediated resistance. Here, we assessed AvrLm3 polymorphism in a collection of 235 L. maculans isolates. No field isolates exhibited deletion or inactivating mutations in AvrLm3, as observed for other L. maculans avirulence genes. Eleven isoforms of the AvrLm3 protein were found...
February 4, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28160377/novel-gene-sequence-markers-for-isolate-tracking-within-monilinia-fructicola-lesions
#19
M E Dowling, G Schnabel, H G Boatwright, S E Everhart
Dowling, M.E., Schnabel, G., Boatwright, H.G., and Everhart, S.E. xxxx. Novel gene-sequence markers for isolate tracking within Monilinia fructicola lesions. Pest Management Science xxx:xxx-xxx. BACKGROUND: Monilinia fructicola is a diverse pathogen of pome and stone fruits that causes severe economic losses each year. However, little is known about inoculum flow within or between orchards and pathogen establishment in an orchard, because few methods exist for detecting diversity or tracking isolates over time...
February 3, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28155188/inducible-expression-of-bs2-r-gene-from-capsicum-chacoense-in-sweet-orange-citrus-sinensis-l-osbeck-confers-enhanced-resistance-to-citrus-canker-disease
#20
Lorena Noelia Sendín, Ingrid Georgina Orce, Rocío Liliana Gómez, Ramón Enrique, Carlos Froilán Grellet Bournonville, Aldo Sergio Noguera, Adrián Alberto Vojnov, María Rosa Marano, Atilio Pedro Castagnaro, María Paula Filippone
Transgenic expression of the pepper Bs2 gene confers resistance to Xanthomonas campestris pv. vesicatoria (Xcv) pathogenic strains which contain the avrBs2 avirulence gene in susceptible pepper and tomato varieties. The avrBs2 gene is highly conserved among members of the Xanthomonas genus, and the avrBs2 of Xcv shares 96% homology with the avrBs2 of Xanthomonas citri subsp. citri (Xcc), the causal agent of citrus canker disease. A previous study showed that the transient expression of pepper Bs2 in lemon leaves reduced canker formation and induced plant defence mechanisms...
February 2, 2017: Plant Molecular Biology
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