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https://www.readbyqxmd.com/read/29158527/azole-sensitivity-in-leptosphaeria-pathogens-of-oilseed-rape-the-role-of-lanosterol-14%C3%AE-demethylase
#1
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
#2
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
#3
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
https://www.readbyqxmd.com/read/29134663/multiple-plasmid-borne-virulence-genes-of-clavibacter-michiganensis-ssp-capsici-critical-for-disease-development-in-pepper
#4
In Sun Hwang, Eom-Ji Oh, Donghyuk Kim, Chang-Sik Oh
Clavibacter michiganensis ssp. capsici is a Gram-positive plant-pathogenic bacterium causing bacterial canker disease in pepper. Virulence genes and mechanisms of C. michiganensis ssp. capsici in pepper have not yet been studied. To identify virulence genes of C. michiganensis ssp. capsici, comparative genome analyses with C. michiganensis ssp. capsici and its related C. michiganensis subspecies, and functional analysis of its putative virulence genes during infection were performed. The C. michiganensis ssp...
November 14, 2017: New Phytologist
https://www.readbyqxmd.com/read/29128948/a-dramatic-case-of-odynophagia
#5
B Sopeña, J Limeres, L García-Caballero, M Diniz-Freitas, J Seoane, P Diz
We report the case of a 77-year-old male with a history of aortic stenosis and interstitial lung disease, who debuted 3 years ago with an outbreak of necrotic and very painful canker sores. The severity of the lesions and their refractory response to treatment led to several hospital admissions and multiple consultations to different specialists (ENT, rheumatology, dermatology, ophthalmology, cardiology, and internal medicine). During this time, the patient received central parenteral nutrition with an episode of catheter-related septicemia, and he came to require psychiatric assistance for autolytic ideation...
November 11, 2017: Dysphagia
https://www.readbyqxmd.com/read/29127722/two-members-of-the-velvet-family-vmvea-and-vmvelb-affect-conidiation-virulence-and-pectinase-expression-in-valsa-mali
#6
Yuxing Wu, Liangsheng Xu, Zhiyuan Yin, Qingqing Dai, Xiaoning Gao, Hao Feng, Ralf T Voegele, Lili Huang
Velvet protein family members are important fungal-specific regulators that are involved in conidial development, secondary metabolism, and virulence. To gain broader insight into the physiological functions into the velvet protein family of Valsa mali, which causes a highly destructive canker disease on apple, we conducted a functional analysis of two Velvet protein family members (VmVeA and VmVelB) via gene replacement strategy. Deletion mutants of VmVeA and VmVelB showed increased melanin production, conidiation, and sensitivity to abiotic stresses, but exhibited reduced virulence on detached apple leaves and twigs...
November 11, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/29123980/dynamic-integration-and-excision-of-filamentous-phage-xacf1-in-xanthomonas-citri-pv-citri-the-causative-agent-of-citrus-canker-disease
#7
Abdelmonim A Ahmad, Makoto Kawabe, Ahmed Askora, Takeru Kawasaki, Makoto Fujie, Takashi Yamada
Inovirus XacF1 (7325 nucleotides) is integrated into the genome of Xanthomonas citri pv. citri (Xcc) strains at the host dif site (attB) by the host XerC/D recombination system. The XacF1 attP sequence is located within the coding region of ORF12, a possible phage regulator. After integration, this open reading frame (ORF) is split into two pieces on the host genome. We examined dynamic integration/excision of XacF1 in Xcc strain MAFF 301080 and found that the integration started at 4 h postinfection (p.i.) and peaked at 12 h p...
November 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/29105297/recent-advances-in-understanding-xanthomonas-citri-subsp-citri-pathogenesis-and-citrus-canker-disease-management
#8
Christopher M Ference, Alberto M Gochez, Franklin Behlau, Nian Wang, James H Graham, Jeffrey B Jones
Taxonomic status: Bacteria; Phylum Proteobacteria; Class Gammaproteobacteria; Order Xanthomonadles; Family Xanthomonadaceae; Genus Xanthomonas; Species Xanthomonas citri subsp. citri (Xcc). Host range: Compatible hosts vary in their susceptibility to CC, with grapefruit, lime, and lemon being most susceptible, sweet orange being moderately susceptible, and kumquat and calamondin being among the least susceptible (Gottwald et al., 1993). Microbiological properties: Xcc is a rod-shaped (1.5 - 2.0 X 0.5 - 0.75 µm) gram-negative, aerobic bacterium with a single polar flagellum...
November 4, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/29049366/transgenic-expression-of-antimicrobial-peptide-d2a21-confers-resistance-to-diseases-incited-by-pseudomonas-syringae-pv-tabaci-and-xanthomonas-citri-but-not-candidatus-liberibacter-asiaticus
#9
Guixia Hao, Shujian Zhang, Ed Stover
Citrus Huanglongbing (HLB) associated with 'Candidatus Liberibacter asiaticus' (Las) and citrus canker disease incited by Xanthomonas citri are the most devastating citrus diseases worldwide. To control citrus HLB and canker disease, we previously screened over forty antimicrobial peptides (AMPs) in vitro for their potential application in genetic engineering. D2A21 was one of the most active AMPs against X. citri, Agrobacterium tumefaciens and Sinorhizobium meliloti with low hemolysis activity. Therefore, we conducted this work to assess transgenic expression of D2A21 peptide to achieve citrus resistant to canker and HLB...
2017: PloS One
https://www.readbyqxmd.com/read/29024290/novel-bisthioether-derivatives-containing-a-1-3-4-oxadiazole-moiety-design-synthesis-antibacterial-and-nematocidal-activities
#10
Pei Li, Pingyi Tian, Yongzhong Chen, Xianpeng Song, Wei Xue, Linhong Jin, Deyu Hu, Song Yang, Baoan Song
BACKGROUND: Literature revealed that bisthioether and 1,3,4-oxadiazole derivatives exhibited a wide variety of biological activities. In this study, a series of novel bisthioether derivatives containing a 1,3,4-oxadiazole moiety were synthesized and their antibacterial and nematocidal activities were investigated. RESULTS: Among the title compounds evaluated, compound 4f demonstrated the best antibacterial activities against rice bacterial leaf blight, rice bacterial leaf streak and citrus canker caused by Xanthomonas oryzae pv...
October 12, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29023010/bio-controlling-effect-of-leaf-extract-of-tagetes-patula-l-marigold-on-growth-parameters-and-diseases-of-tomato
#11
Gayatri Nahak, Rajani Kanta Sahu
BACKGROUND: The genus Tagetes (Asteraceae) is native to Americas but some of its members (in particular T. erecta and T. patula) commonly known as marigolds were naturalized in the old world (India, North Africa and Europe) as early as in 16th century. The flowers of French marigold (Tagetes patula L.) are widely used in folk medicine, in particular for treating inflammation-related disorders. MATERIALS AND METHODS: This study investigated the potential use of marigold (Tagetes patula L...
2017: Pakistan Journal of Biological Sciences: PJBS
https://www.readbyqxmd.com/read/29018307/management-of-citrus-canker-in-argentina-a-success-story
#12
REVIEW
B I Canteros, A M Gochez, R C Moschini
Citrus canker is an important bacterial disease of citrus in several regions of the world. Strains of Xanthomonas citri type-A (Xc-A) group are the primary pathogen where citrus canker occurs. After Xc-A entered the Northeast of Argentina in 1974, the disease spread rapidly from 1977 to 1980 and then slowed down and remained moving at slow pace until 1990 when it became endemic. Citrus canker was detected in Northwest Argentina in 2002. This paper presents the main steps in the fight of the disease and the management strategies that have been used to control citrus canker at this time...
October 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28979839/the-periplasmic-binding-protein-nrtt-affects-xantham-gum-production-and-pathogenesis-in-xanthomonas-citri
#13
Aline Sampaio, Vanessa Rodrigues Pegos, Elisa Emiko Oshiro, Andrea Balan
In Xanthomonas citri, the bacterium that causes citrus canker, three ATP-binding cassette (ABC) transporters are known to be dedicated to the uptake of sulfur compounds. In this work, using functional, biophysical and structural methods, we showed that NrtT, a periplasmic component of the ABC transporter NrtCB, is an alkanesulfonate-binding protein and that the deletion of the nrtT gene affected xantham gum synthesis, adhesion and biofilm production, similarly to the phenotype obtained in the X. citri ssuA-knockout strain, in which the alkanesulfonate-binding protein SsuA is absent...
October 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/28973569/walnut-twig-beetle-coleoptera-curculionidae-scolytinae-colonization-of-eastern-black-walnut-nursery-trees
#14
Jackson Audley, William E Klingeman, Albert Mayfield, Scott Myers, Adam Taylor
Thousand cankers disease, caused by the invasive bark beetle Pityophthorus juglandis Blackman and an associated fungal pathogen Geosmithia morbida M.Kolařík, E. Freeland, C. Utley, N. Tisserat, currently threatens the health of eastern black walnut (Juglans nigra L.) in North America. Both the beetle and pathogen have expanded beyond their native range via transport of infested walnut wood. Geosmithia morbida can develop in seedlings following inoculation, but the ability of P. juglandis to colonize young, small diameter trees has not been investigated...
May 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28961948/trap-style-bait-and-height-deployments-in-black-walnut-tree-canopies-help-inform-monitoring-strategies-for-bark-and-ambrosia-beetles-coleoptera-curculionidae-scolytinae
#15
COMPARATIVE STUDY
William E Klingeman, Alicia M Bray, Jason B Oliver, Christopher M Ranger, Debra E Palmquist
Knowledge about which bark and ambrosia beetle species are active and at what heights in black walnut canopies is not well understood. Neither is the role of these beetles in spreading Thousand Cankers Disease. To assist with future planned research, which will assess the extent to which these beetle species are associated with Geosmithia morbida Kolařík, Freeland, Utley, and Tisserat (Ascomycota: Hypocreales: Bionectriaceae), experiments were undertaken to monitor bark and ambrosia beetles in urban landscapes and parks in Tennessee between 2011 and 2013...
October 1, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/28960871/the-feruloyl-esterase-genes-are-required-for-full-pathogenicity-of-the-apple-tree-canker-pathogen-valsa-mali
#16
Ming Xu, Xiaoning Gao, Jiliang Chen, Zhiyuan Yin, Hao Feng, Lili Huang
Apple Valsa canker, which is caused by the fungus Valsa mali, is one of the most destructive diseases of apple trees in East Asia. Feruloyl esterases (ferulic acid esterases, FAEs), which belong to a subclass of carboxylic esterases, can cleave ester bonds that crosslink hydroxycinnamic acids and arabinoxylans or certain pectins in plant cell walls. However, a pathogenic role of FAE has not been demonstrated in plant pathogenic fungi. In this study, the FAE gene family, including one type A, one type B, three type C and two type D FAE genes, was identified in V...
September 29, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28945528/wohlfahrtiimonas-populi-sp-nov-isolated-from-symptomatic-bark-of-a-populus-%C3%A3-euramericana-canker
#17
Yong Li, Wei Fang, Han Xue, Xu-Qi Yang, Shou-Jiang Xie, Lai-Fa Wang
A Gram-stain-negative, facultatively anaerobic, motile, bacterial strain, 34C10-3-10T, was isolated from symptomatic bark tissue of a Populus ×euramericana canker. The isolate could grow between 10 and 37 °C, at pH 5 to 11, and in 0-3 % (w/v) NaCl. The strain was oxidase and catalase positive. The ubiquinone of strain 34C10-3-10T was Q-8. The polar lipid profile of strain 34C10-3-10T included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phospholipid, phosphatidylmonomethylethanolamine, phosphatidylserine; the major fatty acids were C18 : 1ω7c, C14 : 0 and C16 : 1ω7c/C16 : 1ω6c...
September 25, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28888885/a-mitogen-activated-protein-kinase-gene-vmpmk1-regulates-virulence-and-cell-wall-degrading-enzyme-expression-in-valsa-mali
#18
Yuxing Wu, Liangsheng Xu, Juan Liu, Zhiyuan Yin, Xiaoning Gao, Hao Feng, Lili Huang
Mitogen-activated protein kinases (MAPKs) play critical roles in the regulation of different developmental processes and hydrolytic enzyme production in many fungal plant pathogens. In this study, an FUS3/KSS1-related MAPK gene, VmPmk1, was identified and characterized in Valsa mali, which causes a highly destructive canker disease on apple. VmPmk1 deletion mutant showed a significant reduction in growth rate in vitro, and could not produce pycnidium, indicating that the MAPK gene is important for growth and asexual development...
October 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28884658/sphingobacterium-corticis-sp-nov-isolated-from-bark-of-populus-%C3%A3-euramericana
#19
Yong Li, Guan-Tang Xu, Ju-Pu Chang, Li-Min Guo, Xu-Qi Yang, Chun-Gen Piao
A Gram-stain negative, aerobic, non-motile bacterial strain, 23D10-4-9(T), was isolated from symptomatic canker bark tissue of Populus × euramericana. The isolate grew between 4 and 35 °C, with optimal growth occurring at 25 °C. The species was positive for catalase and negative for oxidase activity. Nitrate was not reduced to nitrite. It showed activities toward β-galactosidase and β-glucosidase. Citrate was not utilized. Acid was produced from d-glucose. The major fatty acids were iso-C15 : 0, C16 : 1ω7c and iso-C17 : 0 3-OH...
October 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28875909/brenneria-populi-subsp-brevivirga-subsp-nov-isolated-from-symptomatic-bark-of-populus-%C3%A3-euramericana-canker-and-description-of-brenneria-populi-subsp-populi-subsp-nov
#20
Ming-Hui Zheng, Chun-Gen Piao, Han Xue, Min-Wei Guo, Yong Li
Two Gram-stain-negative, facultatively anaerobic, motile bacterial strains isolated from symptomatic bark of Populus × euramericana canker in China were investigated using a polyphasic approach, including 16S rRNA gene sequencing, multilocus sequence analysis, and biochemical and physiological assays. 16S rRNA gene sequencing indicated that these strains belonged to the genus Brenneria, family Pectobacteriaceae, and had the highest sequence similarity with Brenneria populi CFCC 11963T (98 %). DNA-DNA hybridization experiments revealed DNA-DNA relatedness values of 72...
September 2017: International Journal of Systematic and Evolutionary Microbiology
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