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https://www.readbyqxmd.com/read/28440700/selection-and-assessment-of-plant-growth-promoting-rhizobacteria-pgpr-for-biological-control-of-multiple-plant-diseases
#1
Ke Liu, Molli Newman, John A McInroy, Chia-Hui Hu, Joseph W Kloepper
A study was designed to screen individual strains of plant growth-promoting rhizobacteria (PGPR) for broad-spectrum disease suppression in vitro and in planta. In a preliminary screen, 28 of 196 strains inhibited eight different tested pathogens in vitro. In a secondary screen, these 28 strains showed broad spectrum antagonistic activity to six different genera of pathogens, and 24 of the 28 strains produced five traits reported to be related to plant growth promotion, including nitrogen fixation, phosphate solubilization, indole-3-acetic acid (IAA) production, siderophore production, and biofilm formation...
April 25, 2017: Phytopathology
https://www.readbyqxmd.com/read/28437556/inheritance-of-bacterial-spot-resistance-in-capsicum-annuum-var-annuum
#2
L R A Silva, R Rodrigues, S Pimenta, J W S Correa, M S B Araújo, C S Bento, C P Sudré
Since 2008, Brazil is the largest consumer of agrochemicals, which increases production costs and risks of agricultural products, environment, and farmers' contamination. Sweet pepper, which is one of the main consumed vegetables in the country, is on top of the list of the most sprayed crops. The bacterial spot, caused by Xanthomonas spp, is one of the most damaging diseases of pepper crops. Genetic resistant consists of a suitable way of disease control, but development of durable resistant cultivars as well as understanding of plant-bacterium interaction is being a challenge for plant breeders and pathologists worldwide...
April 20, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28425831/investigating-the-phylogenetic-range-of-gibberellin-biosynthesis-in-bacteria
#3
Raimund Nagel, Reuben J Peters
Certain plant-associated microbes can produce gibberellin (GA) phytohormones, as first described for the rice fungal pathogen Gibberella fujikuroi and, more recently, for bacteria, including several rhizobia and the rice bacterial pathogen Xanthomonas oryzae pv. oryzicola. The relevant enzymes are encoded by a biosynthetic operon that exhibits both a greater phylogenetic range and scattered distribution among plant-associated bacteria. Here, the phylogenetic distribution of this operon was investigated. To demonstrate conserved functionality, the enzymes encoded by the disparate operon from X...
April 20, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28423458/dissecting-virulence-function-from-recognition-cell-death-suppression-in-nicotiana-benthamiana-by-xopq-hopq1-family-effectors-relies-on-eds1-dependent-immunity
#4
Norman Adlung, Ulla Bonas
Many Gram-negative plant pathogenic bacteria express effector proteins of the XopQ/HopQ1 family which are translocated into plant cells via the type III secretion system during infection. In Nicotiana benthamiana, recognition of XopQ/HopQ1 proteins induces an effector-triggered immunity (ETI) reaction which is not associated with strong cell death but renders plants immune against Pseudomonas syringae and Xanthomonas campestris pv. vesicatoria strains. Additionally, XopQ suppresses cell death in N. benthamiana when transiently co-expressed with cell death inducers...
April 19, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28421674/retraction-statement-dynamic-complex-formation-between-hd-gyp-ggdef-and-pilz-domain-proteins-regulates-motility-in-xanthomonas-campestris
#5
(no author information available yet)
The following article from Molecular Microbiology (2012) 86(3), 557-567, 'Dynamic complex formation between HD-GYP, GGDEF and PilZ domain proteins regulates motility in Xanthomonas campestris' by Robert P. Ryan, Yvonne McCarthy, Patrick A. Kiely, Rosemary O'Connor, Chuck S. Farah, Judith P. Armitage and J. Maxwell Dow published online in Wiley Online Library (wileyonlinelibrary.com), has been retracted by agreement between the authors, the journal Editor-in-Chief, John D Helmann, and John Wiley & Sons Ltd. Since publication of the above article, it has been brought to our attention that there are several image duplications across Figures 3, 5 and 6 including duplication with another article in PNAS: 'Cell-cell signal-dependent dynamic interactions between HD-GYP and GGDEF domain proteins mediate virulence in Xanthomonas campestris', by Robert P...
May 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28421040/isolation-and-molecular-characterization-of-novel-chlorpyrifos-and-3-5-6-trichloro-2-pyridinol-degrading-bacteria-from-sugarcane-farm-soils
#6
Smriti Rayu, Uffe N Nielsen, Loïc Nazaries, Brajesh K Singh
Chlorpyrifos (CP) is one of the most widely used organophosphate pesticides in agriculture worldwide, but its extensive use has led to the contamination of various soil and water systems. Microbial bioremediation is considered to be one of the most viable options for the removal of CP from the environment; however, little is known about the soil bacterial diversity that degrade CP. Sequential soil and liquid culture enrichments enabled the isolation of bacterial CP degraders with sequence homologies to Xanthomonas sp...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28420101/the-effect-of-citrus-essential-oils-and-their-constituents-on-growth-of-xanthomonas-citri-subsp-citri
#7
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/28417425/overexpression-of-oshsp18-0-ci-enhances-resistance-to-bacterial-leaf-streak-in-rice
#8
Yanhu Ju, Hongjuan Tian, Ruihua Zhang, Liping Zuo, Guixiu Jin, Qian Xu, Xinhua Ding, Xiangkui Li, Zhaohui Chu
BACKGROUND: The small heat shock proteins represent a large family of proteins that respond to a wide range of abiotic and biotic stresses. OsHsp18.0-CI confers tolerance to salt and cadmium and interacts with viral RNA-dependent RNA polymerase (RdRp). However, the direct function of OsHsp18.0-CI in resistance against biotic stresses remains unclear in rice. RESULTS: Here, we report that the expression of OsHsp18.0-CI was up-regulated upon inoculation with RS105, a strain of Xanthomonas oryzae pv...
December 2017: Rice
https://www.readbyqxmd.com/read/28415502/antimicrobial-textiles-biogenic-silver-nanoparticles-against-candida-and-xanthomonas
#9
Daniela Ballottin, Stephanie Fulaz, Flávia Cabrini, Junko Tsukamoto, Nelson Durán, Oswaldo L Alves, Ljubica Tasic
This paper introduces cotton fibers impregnated with biogenic silver nanoparticles (AgNPs), synthesized from a Fusarium oxysporum fungal filtrate (FF) solution, and open up the possibility for their use in medical environment and agriculture clothing as means to avoid microbial spreading. After thorough AgNPs characterization, regarding their physical, chemical and biochemical properties, Minimum Inhibitory Concentrations (MIC) against some human and orange tree pathogens were determined. We report the strong AgNPs activity against Candida parapsilosis and Xanthomonas axonopodis pv...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28412528/the-global-strategy-employed-by-xanthomonas-oryzae-pv-oryzae-to-conquer-low-oxygen-tension
#10
Jianliang Wang, Jing Guo, Shasha Wang, Zhiyong Zeng, Dehong Zheng, Xiaoyan Yao, Haoquan Yu, Lifang Ruan
Xanthomonas oryzae pv. oryzae (Xoo) is a notorious rice pathogen that causes bacterial leaf blight (BLB), a destructive rice disease. Low-oxygen tension in the xylem vessels of rice stresses Xoo during infection. In this study, differentially expressed proteins under normoxic and hypoxic conditions were identified using high-performance liquid chromatography (HPLC) coupled with LC-MS/MS to investigate the global effects of low oxygen environment on Xoo PXO99(A). A statistically validated list of 187 (normoxia) and 140 (hypoxia) proteins with functional assignments was generated, allowing the reconstruction of central metabolic pathways...
April 12, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28401640/bacterial-and-plant-natriuretic-peptides-improve-plant-defense-responses-against-pathogens
#11
Florencia A Ficarra, Carolina Grandellis, Betiana S Garavaglia, Natalia Gottig, Jorgelina Ottado
Plant natriuretic peptides (PNPs) are implicated in the regulation of ions and water homeostasis, and their participation in the plant immune response has been also proposed. Xanthomonas citri subsp. citri contains a gene encoding a PNP-like protein (XacPNP) that has no homologues in other bacteria. XacPNP mimics its Arabidopsis thaliana homolog AtPNP-A by modifying host responses to create favorable conditions for pathogen survival. However, the ability of XacPNP to induce plant defense responses was never investigated...
April 12, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28400786/effector-mimics-and-integrated-decoys-the-never-ending-arms-race-between-rice-and-xanthomonas-oryzae
#12
REVIEW
Paola Zuluaga, Boris Szurek, Ralf Koebnik, Thomas Kroj, Jean-Benoit Morel
Plants are constantly challenged by a wide range of pathogens and have therefore evolved an array of mechanisms to defend against them. In response to these defense systems, pathogens have evolved strategies to avoid recognition and suppress plant defenses (Brown and Tellier, 2011). Three recent reports dealing with the resistance of rice to Xanthomonas oryzae have added a new twist to our understanding of this fascinating co-evolutionary arms race (Ji et al., 2016; Read et al., 2016; Triplett et al., 2016)...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28397273/internalisation-of-escherichia-coli-o157-h7-gfp-in-rocket-and-swiss-chard-baby-leaves-as-affected-by-abiotic-and-biotic-damage
#13
Rahel Hartmann, Andreas Fricke, Hartmut Stützel, Suzan Mansourian, Teun Dekker, Walter Wohanka, Beatrix Alsanius
Internalisation of human pathogens in edible parts of vegetables eaten raw is a major concern, since once internalised they are protected from sanitising treatments. In this study, we examined invasion of gfp-labelled E. coli O157:H7 into intact and biotically (infection with Xanthomonas campestris/Pseudomonas syringae) and abiotically (grating with silicon carbide) damaged leaves of wild rocket (Diplotaxis tenuifolia) and Swiss chard (Beta vulgaris subsp. cicla) using laser scanning confocal microscopy. Bacterial cells were found in internal locations of the tissue, irrespective of tissue health status...
April 11, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28378142/functional-characterization-and-transcriptional-analysis-of-icd2-gene-encoding-an-isocitrate-dehydrogenase-of-xanthomonas-campestris-pv-campestris
#14
Ying-Chuan Chiang, Chao-Tsai Liao, Shin-Chiao Du, Yi-Min Hsiao
Isocitrate dehydrogenase (IDH) catalyzes the oxidative decarboxylation of isocitrate to alpha-ketoglutarate. In the genome of Xanthomonas campestris pv. campestris, the phytopathogen that causes black rot in cruciferous plants, two putative IDH genes, icd1 and icd2, have been annotated. Their physiological roles in X. campestris pv. campestris are unclear. In this study, the icd2 gene from X. campestris pv. campestris was characterized in detail. We demonstrated genetically that icd2 gene encodes a functional IDH, and is involved in virulence as well as bacterial attachment...
April 4, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28371200/engineering-canker-resistant-plants-through-crispr-cas9-targeted-editing-of-the-susceptibility-gene-cslob1-promoter-in-citrus
#15
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/28369120/fatty-acid-dsf-binds-and-allosterically-activates-histidine-kinase-rpfc-of-phytopathogenic-bacterium-xanthomonas-campestris-pv-campestris-to-regulate-quorum-sensing-and-virulence
#16
Zhen Cai, Zhi-Hui Yuan, Huan Zhang, Yue Pan, Yao Wu, Xiu-Qi Tian, Fang-Fang Wang, Li Wang, Wei Qian
As well as their importance to nutrition, fatty acids (FA) represent a unique group of quorum sensing chemicals that modulate the behavior of bacterial population in virulence. However, the way in which full-length, membrane-bound receptors biochemically detect FA remains unclear. Here, we provide genetic, enzymological and biophysical evidences to demonstrate that in the phytopathogenic bacterium Xanthomonas campestris pv. campestris, a medium-chain FA diffusible signal factor (DSF) binds directly to the N-terminal, 22 amino acid-length sensor region of a receptor histidine kinase (HK), RpfC...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28359678/bodyguards-pathogen-derived-decoys-that-protect-virulence-factors
#17
Judith K Paulus, Jiorgos Kourelis, Renier A L van der Hoorn
Recent studies on plant-pathogen interactions have exposed a new strategy used by plant pathogens: decoy effectors that protect virulence factors. Examples of these "bodyguards" include the recently discovered PsXLP1 from Phytophthora sojae and truncated TALEs from Xanthomonas oryzae. These examples suggest important roles for seemingly non-functional effector proteins in distracting the host.
March 27, 2017: Trends in Plant Science
https://www.readbyqxmd.com/read/28355306/genome-wide-association-analysis-identifies-resistance-loci-for-bacterial-blight-in-a-diverse-collection-of-indica-rice-germplasm
#18
Fan Zhang, Zhi-Chao Wu, Ming-Ming Wang, Fan Zhang, Michael Dingkuhn, Jian-Long Xu, Yong-Li Zhou, Zhi-Kang Li
Bacterial blight, which is caused by Xanthomonas oryzae pv. oryzae (Xoo), is one of the most devastating rice diseases worldwide. The development and use of disease-resistant cultivars have been the most effective strategy to control bacterial blight. Identifying the genes mediating bacterial blight resistance is a prerequisite for breeding cultivars with broad-spectrum and durable resistance. We herein describe a genome-wide association study involving 172 diverse Oryza sativa ssp. indica accessions to identify loci influencing the resistance to representative strains of six Xoo races...
2017: PloS One
https://www.readbyqxmd.com/read/28343961/protein-depletion-using-the-arabinose-promoter-in-xanthomonas-citri-subsp-citri
#19
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 24, 2017: Plasmid
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
#20
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
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