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https://www.readbyqxmd.com/read/28194866/pseudomonas-protegens-cs1-from-the-lemon-phyllosphere-as-a-candidate-for-citrus-canker-biocontrol-agent
#1
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
#2
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
#3
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 the Asiatic citrus canker, one of the most serious diseases of citrus worldwide. The lipopolysaccharide (LPS) molecule was demonstrated to be involved in X. citri pv. citri virulence. Despite the enormous progress made in the investigation of molecular mechanisms responsible for bacterial pathogenicity, the determination of the detailed LPS structure-activity relationship still remains limited as the current knowledge is mainly based on structural determination of one X...
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
#4
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
#5
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
#6
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
#7
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
#8
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
https://www.readbyqxmd.com/read/28142223/cryphonectria-parasitica-the-causal-agent-of-chestnut-blight-invasion-history-population-biology-and-disease-control
#9
Daniel Rigling, Simone Prospero
Chestnut blight, caused by Cryphonectria parasitica, is a devastating disease infecting American and European chestnut trees. The pathogen is native to East Asia and was spread to other continents via infected chestnut plants. This review summarizes the current state of research on this pathogen with a special emphasis on its interaction with a hyperparasitic mycovirus that acts as a biological control agent of chestnut blight. Taxonomy: Cryphonectria parasitica (Murr.) Barr. is a Sordariomycete (ascomycete) fungus in the family Cryphonetriaceae (Order Diaporthales)...
January 31, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28131994/ectopic-accumulation-of-linalool-confers-resistance-to-xanthomonas-citri-subsp-citri-in-transgenic-sweet-orange-plants
#10
Takehiko Shimada, Tomoko Endo, Ana Rodríguez, Hiroshi Fujii, Shingo Goto, Takakazu Matsuura, Yuko Hojo, Yoko Ikeda, Izumi C Mori, Takashi Fujikawa, Leandro Peña, Mitsuo Omura
In order to clarify whether high linalool content in citrus leaves alone induces strong field resistance to citrus canker caused by Xanthomonas citri subsp. citri (Xcc), and to assess whether this trait can be transferred to a citrus type highly sensitive to the bacterium, transgenic 'Hamlin' sweet orange (Citrus sinensis L. Osbeck) plants over-expressing a linalool synthase gene (CuSTS3-1) were generated. Transgenic lines (LIL) with the highest linalool content showed strong resistance to citrus canker when spray inoculated with the bacterium...
January 27, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28112597/identification-of-loci-of-pseudomonas-syringae-pv-actinidiae-involved-in-lipolytic-activity-and-their-role-in-colonization-of-kiwifruit-leaves
#11
Hitendra Kumar Patel, Patrizia Ferrante, Meng Xianfa, Sree Gowrinadh Javvadi, Sujatha Subramoni, Marco Scortichini, Vittorio Venturi
Bacterial canker disease caused by Pseudomonas syringae pv. actinidiae (Psa), an emerging pathogen of kiwifruit plants, has recently brought about major economic losses worldwide. Genetic studies on virulence functions of Psa have not yet been reported and there is little experimental data regarding bacterial genes involved in pathogenesis. In this study, we performed a genetic screen in order to identify transposon mutants altered in the lipolytic activity as it is known that mechanisms of regulation, production and secretion of enzymes often play crucial roles in virulence of plant pathogens...
January 23, 2017: Phytopathology
https://www.readbyqxmd.com/read/28101896/adaptation-of-genetically-monomorphic-bacteria-evolution-of-copper-resistance-through-multiple-horizontal-gene-transfers-of-complex-and-versatile-mobile-genetic-elements
#12
D Richard, V Ravigné, A Rieux, B Facon, C Boyer, K Boyer, P Grygiel, S Javegny, M Terville, B I Canteros, I Robène, C Vernière, A Chabirand, O Pruvost, P Lefeuvre
Copper-based antimicrobial compounds are widely used to control plant bacterial pathogens. Pathogens have adapted in response to this selective pressure. Xanthomonas citri pv. citri, a major citrus pathogen causing Asiatic citrus canker, was first reported to carry plasmid-encoded copper resistance in Argentina. This phenotype was conferred by the copLAB gene system. The emergence of resistant strains has since been reported in Réunion and Martinique. Using microsatellite-based genotyping and copLAB PCR, we demonstrated that the genetic structure of the copper-resistant strains from these three regions was made up of two distant clusters and varied for the detection of copLAB amplicons...
January 19, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28100927/resolution-of-morphology-based-taxonomic-delusions-acrocordiella-basiseptospora-blogiascospora-clypeosphaeria-hymenopleella-lepteutypa-pseudapiospora-requienella-seiridium-and-strickeria
#13
W M Jaklitsch, A Gardiennet, H Voglmayr
Fresh material, type studies and molecular phylogeny were used to clarify phylogenetic relationships of the nine genera Acrocordiella, Blogiascospora, Clypeosphaeria, Hymenopleella, Lepteutypa, Pseudapiospora, Requienella, Seiridium and Strickeria. At first sight, some of these genera do not seem to have much in common, but all were found to belong to the Xylariales, based on their generic types. Thus, the most peculiar finding is the phylogenetic affinity of the genera Acrocordiella, Requienella and Strickeria, which had been classified in the Dothideomycetes or Eurotiomycetes, to the Xylariales...
December 2016: Persoonia
https://www.readbyqxmd.com/read/28065920/pamps-prrs-effectors-and-r-genes-associated-with-citrus-pathogen-interactions
#14
REVIEW
Ronaldo J D Dalio, Diogo M Magalhães, Carolina M Rodrigues, Gabriella D Arena, Tiago S Oliveira, Reinaldo R Souza-Neto, Simone C Picchi, Paula M M Martins, Paulo J C Santos, Heros J Maximo, Inaiara S Pacheco, Alessandra A De Souza, Marcos A Machado
BACKGROUND: Recent application of molecular-based technologies has considerably advanced our understanding of complex processes in plant-pathogen interactions and their key components such as PAMPs, PRRs, effectors and R-genes. To develop novel control strategies for disease prevention in citrus, it is essential to expand and consolidate our knowledge of the molecular interaction of citrus plants with their pathogens. SCOPE: This review provides an overview of our understanding of citrus plant immunity, focusing on the molecular mechanisms involved in the interactions with viruses, bacteria, fungi, oomycetes and vectors related to the following diseases: tristeza, psorosis, citrus variegated chlorosis, citrus canker, huanglongbing, brown spot, post-bloom, anthracnose, gummosis and citrus root rot...
January 8, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28063194/evolution-of-copper-resistance-in-the-kiwifruit-pathogen-pseudomonas-syringae-pv-actinidiae-through-acquisition-of-integrative-conjugative-elements-and-plasmids
#15
Elena Colombi, Christina Straub, Sven Künzel, Matthew D Templeton, Honour C McCann, Paul B Rainey
Horizontal gene transfer can precipitate rapid evolutionary change. In 2010 the global pandemic of kiwifruit canker disease caused by Pseudomonas syringae pv. actinidiae (Psa) reached New Zealand. At the time of introduction, the single clone responsible for the outbreak was sensitive to copper, however, analysis of a sample of isolates taken in 2015 and 2016 showed that a quarter were copper resistant. Genome sequences of seven strains showed that copper resistance - comprising czc/cusABC and copABCD systems - along with resistance to arsenic and cadmium, was acquired via uptake of integrative conjugative elements (ICEs), but also plasmids...
January 7, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28062287/potential-use-of-cuminic-acid-as-a-botanical-fungicide-against-valsa-mali
#16
Yong Wang, Yang Sun, LiRong Han, Xing Zhang, Juntao Feng
Valsa canker caused by Valsa mali is commonly present in eastern Asia and cause large economic losses. Because of limited agricultural measures and chemical residues of commonly used fungicides there is an urgent need of alternative plant protecting agents. On this background the activity of cuminic acid, a plant extract from the seed of Cuminum cyminum L, was assessed. The median effective concentration (EC50) values for inhibition of mycelial growth of seven V. mali strains ranged from 3.046 to 8.342 μg/mL, with an average EC50 value of 4...
January 3, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28008326/localization-and-transcriptional-responses-of-chrysoporthe-austroafricana-in-eucalyptus-grandis-identify-putative-pathogenicity-factors
#17
Ronishree Mangwanda, Lizahn Zwart, Nicolaas A van der Merwe, Lucy Novungayo Moleleki, Dave Kenneth Berger, Alexander A Myburg, Sanushka Naidoo
Chrysoporthe austroafricana is a fungal pathogen that causes the development of stem cankers on susceptible Eucalyptus grandis trees. Clones of E. grandis that are partially resistant and highly susceptible have been identified based on the extent of lesion formation on the stem upon inoculation with C. austroafricana. These interactions have been used as a model pathosystem to enhance our understanding of interactions between pathogenic fungi and woody hosts, which may be different to herbaceous hosts. In previous research, transcriptomics of host responses in these two clones to C...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27997595/seedborne-pathogenic-fungi-in-common-bean-phaseolus-vulgaris-cv-inta-rojo-in-nicaragua
#18
Delfia Marcenaro, Jari P T Valkonen
Common bean (Phaseolus vulgaris L.) is an important legume with high nutritional value. In Nicaragua, certified healthy seeds of local bean varieties are not available, and seedborne fungi have gained little attention. Here, were surveyed seedborne pathogenic fungi in an important local bean cultivar, 'INTA Rojo'. Beans grown in the four main production areas in Nicaragua (Boaco, Carazo, Estelí, Matagalpa) for future use as seed stock were sampled from four seed storehouses and six seed lots. A total of 133 fungal strains were isolated from surface-sterilized beans and inoculated to healthy lima beans (Phaseolus lunatus) under controlled conditions...
2016: PloS One
https://www.readbyqxmd.com/read/27936512/genome-editing-of-the-disease-susceptibility-gene-cslob1-in-citrus-confers-resistance-to-citrus-canker
#19
Hongge Jia, Yunzen Zhang, Vladimir Orbovic, Jin Xu, Frank White, Jeffrey Jones, Nian Wang
Citrus is a highly valued tree crop worldwide, while, at the same time, citrus production faces many biotic challenges, including bacterial canker and Huanglongbing (HLB). Breeding for disease resistant varieties is the most efficient and sustainable approach to control plant diseases. Traditional breeding of citrus varieties is challenging due to multiple limitations, including polyploidy, polyembryony, extended juvenility, and long crossing cycles. Targeted genome editing technology has the potential to shorten varietal development for some traits, including disease resistance...
December 9, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/27904461/outbreak-and-spread-of-bacterial-canker-of-kiwifruit-caused-by-pseudomonas-syringae-pv-actinidiae-biovar-3-in-korea
#20
Gyoung Hee Kim, Kwang-Hyung Kim, Kyeong In Son, Eu Ddeum Choi, Young Sun Lee, Jae Sung Jung, Young Jin Koh
A bacterial pathogen, Pseudomonas syringae pv. actinidiae (Psa), is a causal agent of kiwifruit bacterial canker worldwide. Psa biovar 3 (Psa3) was first detected in 2011 at an orchard in Dodeok-myeon, Goheunggun, Jeonnam Province in Korea. In this study, we present the results of an epidemiological study regarding Psa3 occurrence on kiwifruit orchards in Korea for the period of 2013 to 2015. Since the first detection of Psa3 in 2011, there was no further case reported by 2013. However, Psa3 was rapidly spreading to 33 orchards in 2014; except for three orchards in Sacheonsi, Gyeongnam Province, most cases were reported in Jeju Island...
December 2016: Plant Pathology Journal
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