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https://www.readbyqxmd.com/read/28510721/cold-tolerance-of-pityophthorus-juglandis-coleoptera-scolytidae-from-northern-california
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/28437560/phylogeography-and-population-structure-analysis-reveals-diversity-by-mutations-in-lasiodiplodia-theobromae-with-distinct-sources-of-selection
#4
P H D Santos, B M Carvalho, K P Aguiar, F A S Aredes, T P S Poltronieri, J M S Vivas, V Mussi Dias, G A Bezerra, D B Pinho, M G Pereira, S F Silveira
Lasiodiplodia theobromae is a plant pathogen with a worldwide distribution, with low host specificity, causing stem cankers, dieback diseases, and fruit rot in several species of plants. In coconut, this pathogen is reported as the etiological agent of "coconut leaf blight" (CLB) disease, causing several losses in fruit production. The CLB is an important disease for this crop in Brazil. In our study, we used a phylogeographic approach through the molecular characterization of the translation elongation factor 1-α (TEF1-α) to elucidate the pathogen distribution in Brazil and other countries, besides, search information about diversity sources of this pathogen in coconut palm tree at Brazilian northern, northeast, and southeast...
April 20, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28432096/interaction-between-dapg-and-hcn-producing-pseudomonas-brassicacearum-lbum300-and-clavibacter-michiganensis-subsp-michiganensis-in-the-rhizosphere-of-tomato
#5
Mélanie M Paulin, Amy Novinscak, Carine Lanteigne, Vijay J Gadkar, Martin Filion
We have previously demonstrated that inoculation of tomato plants with 2,4-diacetylphloroglucinol (DAPG) and hydrogen cyanide (HCN) producing Pseudomonas brassicacearum LBUM300 could significantly reduce bacterial canker symptoms caused by Clavibacter michiganensis subsp. michiganensis (Cmm). In this study, in order to better characterize the population dynamics of LBUM300 in the rhizosphere of tomato plants, we characterized the role played by DAPG and HCN production by LBUM300 on rhizosphere colonization of healthy and Cmm-infected tomato plants...
April 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28420101/the-effect-of-citrus-essential-oils-and-their-constituents-on-growth-of-xanthomonas-citri-subsp-citri
#6
Hossein Mirzaei-Najafgholi, Saeed Tarighi, Morteza Golmohammadi, Parissa Taheri
Citrus bacterial canker (CBC) caused by Xanthomonas citri subsp. citri (Xcc), is the most devastating of the citrus diseases worldwide. During our study, we found that Essential oils (EOs) of some citrus cultivars are effective on Xcc. Therefore, it prompted us to determine the plant metabolites responsible for the antibacterial properties. We obtained EOs from some locally cultivated citrus by using a Clevenger apparatus and their major constituents were identified by gas chromatography/mass spectrometry (GC-MS)...
April 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28418070/a-signature-of-tree-health-shifts-in-the-microbiome-and-the-ecological-drivers-of-horse-chestnut-bleeding-canker-disease
#7
Britt Koskella, Sean Meaden, William J Crowther, Roosa Leimu, C Jessica E Metcalf
Host susceptibility to pathogens can be shaped by genetic, ecological, and evolutionary factors. The ability to predict the spread of disease therefore requires an integrated understanding of these factors, including effects of pests on pathogen growth and competition between pathogens and commensal microbiota for host resources. We examined interactions between the leaf-mining moth Cameraria ohridella, the bacterial causal agent of bleeding canker disease Pseudomonas syringae pv aesculi, and the bark-associated microbiota of horse chestnut (Aesculus hippocastanum) trees...
April 18, 2017: New Phytologist
https://www.readbyqxmd.com/read/28406911/phylogenetic-analysis-of-family-neisseriaceae-based-on-genome-sequences-and-description-of-populibacter-corticis-gen-nov-sp-nov-a-member-of-the-family-neisseriaceae-isolated-from-symptomatic-bark-of-populus-%C3%A3-euramericana-canker
#8
Yong Li, Han Xue, Sheng-Qi Sang, Cai-Li Lin, Xi-Zhuo Wang
Two Gram-stain negative aerobic bacterial strains were isolated from the bark tissue of Populus × euramericana. The novel isolates were investigated using a polyphasic approach including 16S rRNA gene sequencing, genome sequencing, average nucleotide identity (ANI) and both phenotypic and chemotaxonomic assays. The genome core gene sequence and 16S rRNA gene phylogenies suggest that the novel isolates are different from the genera Snodgrassella and Stenoxybacter. Additionally, the ANI, G+C content, main fatty acids and phospholipid profile data supported the distinctiveness of the novel strain from genus Snodgrassella...
2017: PloS One
https://www.readbyqxmd.com/read/28396678/identification-of-circular-rnas-in-kiwifruit-and-their-species-specific-response-to-bacterial-canker-pathogen-invasion
#9
Zupeng Wang, Yifei Liu, Dawei Li, Li Li, Qiong Zhang, Shuaibin Wang, Hongwen Huang
Research studies have recently focused on circle RNAs (circRNAs) in relation to their regulatory functions in animals. However, the systematic identification of circRNAs in plants, especially non-model plants, is limited. In addition, raw report on the prediction of the potential role of circRNAs in plant response to pathogen invasion is currently available. We conducted the systematic identification of circRNAs from four materials originating from three species belonging to genus Actinidia under different situations using ribosomal RNA (rRNA) depleted RNA-Seq data...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28385839/draft-genome-sequences-of-pectobacterium-carotovorum-subsp-actinidiae-icmp-19971-and-icmp-19972-two-strains-isolated-from-actinidia-chinensis-with-symptoms-of-summer-canker-in-south-korea
#10
Sandra B Visnovsky, Preetinanda Panda, Robert Taylor, Andrew R Pitman
Pectobacterium carotovorum subsp. actinidiae is the causal agent of summer canker in kiwifruit plants in South Korea. We report here the draft genome sequences of two P. carotovorum subsp. actinidiae strains, ICMP 19971 and ICMP 19972, which were originally isolated from Actinidia chinensis with symptoms of summer canker. These genome sequences will aid in the identification of genetic traits associated with their unusual capacity to cause canker and help understanding of the threat these exotic enterobacteria pose to the New Zealand kiwifruit industry...
April 6, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28371200/engineering-canker-resistant-plants-through-crispr-cas9-targeted-editing-of-the-susceptibility-gene-cslob1-promoter-in-citrus
#11
Aihong Peng, Shanchun Chen, Tiangang Lei, Lanzhen Xu, Yongrui He, Liu Wu, Lixiao Yao, Xiuping Zou
Citrus canker, caused by Xanthomonas citri subsp. citri (Xcc), is severely damaging to the global citrus industry. Targeted editing of host disease-susceptibility genes represents an interesting and potentially durable alternative in plant breeding for resistance. Here, we report improvement of citrus canker resistance through CRISPR/Cas9-targeted modification of the susceptibility gene CsLOB1 promoter in citrus. Wanjincheng orange (Citrus sinensis Osbeck) harbors at least three copies of the CsLOB1(G) allele and one copy of the CsLOB1(-) allele...
March 29, 2017: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/28370154/risk-based-management-of-invading-plant-disease
#12
Samuel R Hyatt-Twynam, Stephen Parnell, Richard O J H Stutt, Tim R Gottwald, Christopher A Gilligan, Nik J Cunniffe
Effective control of plant disease remains a key challenge. Eradication attempts often involve removal of host plants within a certain radius of detection, targeting asymptomatic infection. Here we develop and test potentially more effective, epidemiologically motivated, control strategies, using a mathematical model previously fitted to the spread of citrus canker in Florida. We test risk-based control, which preferentially removes hosts expected to cause a high number of infections in the remaining host population...
May 2017: New Phytologist
https://www.readbyqxmd.com/read/28369338/origin-and-evolution-of-the-kiwifruit-canker-pandemic
#13
Honour C McCann, Li Li, Yifei Liu, Dawei Li, Hui Pan, Caihong Zhong, Erik H A Rikkerink, Matthew D Templeton, Christina Straub, Elena Colombi, Paul B Rainey, Hongwen Huang
Recurring epidemics of kiwifruit (Actinidia spp.) bleeding canker disease are caused by Pseudomonas syringae pv. actinidiae (Psa). In order to strengthen understanding of population structure, phylogeography, and evolutionary dynamics, we isolated Pseudomonas from cultivated and wild kiwifruit across six provinces in China. Based on the analysis of 80 sequenced Psa genomes, we show that China is the origin of the pandemic lineage but that strain diversity in China is confined to just a single clade. In contrast, Korea and Japan harbor strains from multiple clades...
April 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/28349984/evidence-for-salicylic-acid-signalling-and-histological-changes-in-the-defence-response-of-eucalyptus-grandis-to-chrysoporthe-austroafricana
#14
Lizahn Zwart, Dave Kenneth Berger, Lucy Novungayo Moleleki, Nicolaas A van der Merwe, Alexander A Myburg, Sanushka Naidoo
Eucalyptus species are cultivated for forestry and are of economic importance. The fungal stem canker pathogen Chrysoporthe austroafricana causes disease of varying severity on E. grandis. The Eucalyptus grandis-Chrysoporthe austroafricana interaction has been established as a model system for studying Eucalyptus antifungal defence. Previous studies revealed that the phytohormone salicylic acid (SA) affects the levels of resistance in highly susceptible (ZG14) and moderately resistant (TAG5) clones. The aims of this study were to examine histochemical changes in response to wounding and inoculation as well as host responses at the protein level...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28343961/protein-depletion-using-the-arabinose-promoter-in-xanthomonas-citri-subsp-citri
#15
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 2017: Plasmid
https://www.readbyqxmd.com/read/28338992/identification-of-the-eucalyptus-grandis-chitinase-gene-family-and-expression-characterization-under-different-biotic-stress-challenges
#16
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
#17
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
#18
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
#19
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
#20
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
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