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Tong Wei, Tsung-Chi Chen, Yuen Ting Ho, Pamela C Ronald
BACKGROUND: The rice receptor kinase XA21 confers robust resistance to the bacterial pathogen Xanthomonas oryzaepv. oryzae(Xoo). We previously reported that XA21 is cleaved in transgenic plants overexpressing XA21 with a GFP tag (Ubi-XA21-GFP) and that the released C-terminal domain is localized to the nucleus. XA21 carries a predicted nuclear localization sequence (NLS) that directs the C-terminal domain to the nucleus in transient assays, whereas alanine substitutions in the NLS disrupt the nuclear localization...
2016: PeerJ
Brian Weselowski, Naeem Nathoo, Alexander William Eastman, Jacqueline MacDonald, Ze-Chun Yuan
BACKGROUND: Paenibacillus polymyxa is a plant-growth promoting rhizobacterium that could be exploited as an environmentally friendlier alternative to chemical fertilizers and pesticides. Various strains have been isolated that can benefit agriculture through antimicrobial activity, nitrogen fixation, phosphate solubilization, plant hormone production, or lignocellulose degradation. However, no single strain has yet been identified in which all of these advantageous traits have been confirmed...
October 18, 2016: BMC Microbiology
Xiao Yu Liang, Xiaoyue Yu, Xiayan Pan, Jian Wu, Yabing Duan, Jianxin Wang, Mingguo Zhou
Thiazole, isothiazole, thiadiazole, and their derivatives are widely thought to induce host defenses against plant pathogens. However, this article reports that bismerthiazol, a thiadiazole molecule, reduces disease by inhibiting the histidine utilization (Hut) pathway and quorum sensing (QS). Bismerthiazol provides excellent control of bacterial rice leaf blight (BLB) caused by Xanthomonas oryzae pv. oryzae (Xoo) but does not greatly inhibit Xoo growth in vitro. According to RNA-seq analysis, transcription of Hut pathway genes of Xoo ZJ173 was inhibited after 4...
October 18, 2016: Molecular Plant Pathology
Xiayan Pan, Jian Wu, Shu Xu, Yabing Duan, Zhou Mingguo
Rice bacterial leaf blight, caused by Xanthomonas oryzae pv. oryzae (Xoo), and rice bacterial leaf streak, caused by Xanthomonas oryzae pv. oryzicola (Xoc), are major diseases of rice. Phenazine-1-carboxylic acid (PCA) is a natural product that is isolated from Pseudomonas spp. and is used to control many important rice diseases in China. We previously reported that PCA disturbs the redox balance, which results in the accumulation of reactive oxygen species (ROS) in Xoo. In this study, we found that PCA significantly up-regulated the transcript levels of catB and katE, which encode catalases, and that PCA-sensitivity was reduced when Xoo and Xoc were cultured with exogenous catalase...
October 17, 2016: Phytopathology
Ting Y Yeh
Unlike Ff-like coliphages, certain filamentous Inoviridae phages integrate their genomes into the host chromosome and enter a prophage state in their infectious cycle. This lysogenic life cycle was first reported for Xanthomonas citri Cf phage. However, except for the X. citri phages Cf and XacF1, complete genome sequence information about lysogenic Xanthomonas phages is not available to date. A proviral sequence of Xf109 phage was identified in the genome of Xanthomonas oryzae, the rice bacterial blight pathogen, and revived as infectious virions to lysogenize its host de novo...
October 14, 2016: Archives of Virology
Yunxie Wei, Wei Hu, Qiannan Wang, Wei Liu, Chunjie Wu, Hongqiu Zeng, Yu Yan, Xiaolin Li, Chaozu He, Haitao Shi
Melatonin is a widely known hormone in animals. Since melatonin was discovered in plants, more and more studies highlight its involvement in a wide range of physiological processes including plant development and stress responses. Many advances have been made in the terms of melatonin-mediated abiotic stress resistance and innate immunity in plants, focusing on model plants such as rice and Arabidopsis. In this study, 7 melatonin synthesis genes were systematically analyzed in cassava. Quantitative real-time PCR showed that all these genes were commonly regulated by melatonin, flg22, Xanthomonas axonopodis pv manihotis (Xam) and hydrogen peroxide (H2O2)...
October 14, 2016: Scientific Reports
Martin Muthee Gakuubi, John M Wagacha, Saifuddin F Dossaji, Wycliffe Wanzala
The objective of this study was to determine the chemical composition and antibacterial activity of essential oils (EOs) of Tagetes minuta against three phytopathogenic bacteria Pseudomonas savastanoi pv. phaseolicola, Xanthomonas axonopodis pv. phaseoli, and Xanthomonas axonopodis pv. manihotis. The essential oils were extracted using steam distillation method in a modified Clevenger-type apparatus while antibacterial activity of the EOs was evaluated by disc diffusion method. Gas chromatography coupled to mass spectrometry (GC/MS) was used for analysis of the chemical profile of the EOs...
2016: International Journal of Microbiology
Min-Seong Kyeon, Soo-Hyeong Son, Young-Hee Noh, Yong-Eon Kim, Hyok-In Lee, Jae-Soon Cha
In 2004, bacterial spot-causing xanthomonads (BSX) were reclassified into 4 species-Xanthomonas euvesicatoria, X. vesicatoria, X. perforans, and X. gardneri. Bacterial spot disease on pepper plant in Korea is known to be caused by both X. axonopodis pv. vesicatoria and X. vesicatoria. Here, we reidentified the pathogen causing bacterial spots on pepper plant based on the new classification. Accordingly, 72 pathogenic isolates were obtained from the lesions on pepper plants at 42 different locations. All isolates were negative for pectolytic activity...
October 2016: Plant Pathology Journal
Areli Herrera Diaz, Izabella Kovacs, Christian Lindermayr
Antimicrobial peptides (AMPs) are small peptides with less than 50 amino acids and are part of the innate immune response in almost all organisms, including bacteria, vertebrates, invertebrates and plants. AMPs are active against a broad-spectrum of pathogens. The inducible expression of AMPs in plants is a promising approach to combat plant pathogens with minimal negative side effects, such as phytotoxicity or infertility. In this study, inducible expression of the de-novo designed AMP SP1-1 in Micro Tom tomato protected tomato fruits against bacterial spot disease caused by Xanthomonas campestris pv...
2016: PloS One
Nicholas C Thomas, Benjamin Schwessinger, Furong Liu, Huamin Chen, Tong Wei, Yen P Nguyen, Isaac W F Shaker, Pamela C Ronald
The rice XA21 receptor kinase confers robust resistance to the bacterial pathogen Xanthomonas oryzaepv. oryzae (Xoo). We developed a detached leaf infection assay to quickly and reliably measure activation of the XA21-mediated immune response using genetic markers. We used RNA sequencing of elf18 treated EFR:XA21:GFP plants to identify candidate genes that could serve as markers for XA21 activation. From this analysis, we identified eight genes that are up-regulated in both in elf18 treated EFR:XA21:GFP rice leaves and Xoo infected XA21 rice leaves...
2016: PeerJ
He Liu, Qiang Lin, Yixian Xie, Huoming Shu, Bo Li, Ge Gao, Kai Xiao, Xiaojun Yao, Runcong Dong, Yanlin Liu, Mengxiong He, Luyong Wu, Zhenfan Sun, Wenying He
1-(4-Bromophenyl)-5-phenyl-1H-1,2,3-triazole (BPT) was a newly synthesized compound. The acute toxicities of BPT to mice by intragastric administration have been determined and the result indicates that the intragastric administration of BPT did not produce any significant toxic effect on Kunming strain mice. It is also evaluated for the antimicrobial activity of BPT against three kinds of plant mycoplasma, Fusarium Wilt (race 4), Colletotrichum gloeosporioides Penz. and Xanthomonas oryzae by different method in vitro...
September 24, 2016: Journal of Photochemistry and Photobiology. B, Biology
Shanshan Xie, Haoyu Zang, Huijun Wu, Uddin Rajer Faheem, Xuewen Gao
Recent investigations have demonstrated that bacteria employ the volatile compounds they produce during interactions with other organisms such as plants, fungi, nematodes and bacteria. However, studies focused on the antibacterial activity of plant growth promoting rhizobacteria (PGPR) volatiles against bacterial phytopathogens are still rare. In this study, Bacillus strain D13, which is antagonistic to Xanthomonas oryzae pv. oryzae (Xoo), was isolated and screened. Volatile compounds emitted from strain D13 reduced the colony diameter and cell motility of Xoo cultured in divided Petri plates...
September 29, 2016: Molecular Plant Pathology
Fanny Sunden, Ishraq AlSadhan, Artem Y Lyubimov, Susanne Ressl, Helen Wiersma-Koch, Jamar Borland, Clayton L Brown, Tory A Johnson, Zorawar Singh, Daniel Herschlag
Naively one might have expected an early division between phosphate monoesterases and diesterases of the Alkaline Phosphatase (AP) superfamily. On the contrary, prior results and our structural and biochemical analyses of phosphate monoesterase PafA, from Chryseobacterium meningosepticum, indicate similarities to a superfamily phosphate diesterase [Xanthomonas citri Nucleotide Pyrophosphatase/Phosphodiesterase (NPP)] and distinct differences from the three metal ion AP superfamily monoesterase, from E. coli AP (EcAP)...
September 26, 2016: Journal of the American Chemical Society
Pablo López-Soriano, Karine Boyer, Sophie Cesbron, María Clara Morente, Javier Peñalver, Ana Palacio-Bielsa, Christian Vernière, María M López, Olivier Pruvost
Xanthomonas arboricola pv. pruni is the causal agent of the bacterial spot disease of stone fruits, almond and some ornamental Prunus species. In Spain it was first detected in 2002 and since then, several outbreaks have occurred in different regions affecting mainly Japanese plum, peach and almond, both in commercial orchards and nurseries. As the origin of the introduction(s) was unknown, we have assessed the genetic diversity of 239 X. arboricola pv. pruni strains collected from 11 Spanish provinces from 2002 to 2013 and 25 reference strains from international collections...
2016: PloS One
Ian Lorenzo Quibod, Alvaro Perez-Quintero, Nicholas J Booher, Gerbert S Dossa, Genelou Grande, Boris Szurek, Casiana Vera Cruz, Adam J Bogdanove, Ricardo Oliva
Understanding the processes that shaped contemporary pathogen populations in agricultural landscapes is quite important to define appropriate management strategies and to support crop improvement efforts. Here, we took advantage of an historical record to examine the adaptation pathway of the rice pathogen Xanthomonas oryzae pv. oryzae (Xoo) in a semi-isolated environment represented in the Philippine archipelago. By comparing genomes of key Xoo groups we showed that modern populations derived from three Asian lineages...
September 26, 2016: Scientific Reports
Shih-Chieh Chang, Wen-Ling Deng, Hsiou-Chen Huang, Kuang-Ren Chung, Kuo-Ching Tzeng
Bacterial canker, caused by Xanthomonas citri subsp. citri (Xcc), is one of the most destructive diseases of citrus. The pectolytic enzymes produced by phytobacteria are important virulence factors involved in tissue maceration, electrolyte loss and cell death of host plants. In this study, the promoter activity of the pectolytic enzyme genes pel1, pel2, pel3, pglA, and peh-1 were investigated in Xcc XW19 strain using the β-glucuronidase (GUS) gene as a reporter. GUS activity expressed under the control of the pel1, pel3, pglA, and peh-1 gene promoters positively correlated with bacterial growth...
November 2016: Microbiological Research
Silvana Petrocelli, Maite R Arana, Marcela N Cabrini, Adriana C Casabuono, Laura Moyano, Matías Beltramino, Leandro M Moreira, Alicia S Couto, Elena G Orellano
Type IV pili (Tfp) are widely distributed adhesins of bacterial surfaces. In plant pathogenic bacteria, Tfp are involved in host colonization and pathogenesis. Xanthomonas citri subsp. citri (Xcc) is the phytopathogen responsible for citrus canker disease. In this work, three Tfp structural genes, fimA, fimA1, and pilA from Xcc were studied. A pilA mutant strain from Xcc (XccΔpilA) was constructed and differences in physiological features, such as motilities, adhesion, and biofilm formation, were observed...
December 2016: Current Microbiology
Youngseok Ham, Tae-Jong Kim
Biofilm provides a bacterial hiding place by forming a physical barrier and causing physiological changes in cells. The elimination of biofilm is the main goal of hygiene. Chemicals that are inhibitory to biofilm formation have been developed for use in food, personal hygiene products, and medical instruments. Monoacylglycerols are recognized as safe and are used in food as emulsifiers. In this study, the inhibitory activity of monoacylglycerols on bacterial biofilm formation was evaluated systematically with four bacterial strains, Aeromonas hydrophila, Streptococcus mutans, Xanthomonas oryzae, and Yersinia enterocolitica...
2016: SpringerPlus
Roxana A Roeschlin, María A Favaro, María A Chiesa, Sergio Alemano, Adrián A Vojnov, Atilio P Castagnaro, María P Filippone, Frederick G Gmitter, José Gadea, María R Marano
Xanthomonas citri ssp. citri (X. citri) is the causal agent of Asiatic citrus canker, a disease that seriously affects most commercially important Citrus species worldwide. We have previously identified a natural variant, X. citri A(T) , that triggers a host-specific defense response in Citrus limon. However, the mechanisms involved in this canker disease resistance are unknown. In this work, the defense response induced by X. citri A(T) was assessed by transcriptomic, physiological and ultrastructural analyses and the effects on bacterial biofilm formation were monitored in parallel...
September 20, 2016: Molecular Plant Pathology
Joo Yong Woo, Kwang Ju Jeong, Young Jin Kim, Kyung-Hee Paek
In Arabidopsis, several L-type lectin receptor kinases (LecRKs) have been identified as putative immune receptors. However, to date, there have been few analyses of LecRKs in crop plants. Virus-induced gene silencing of CaLecRK-S.5 verified the role of CaLecRK-S.5 in broad-spectrum resistance. Compared with control plants, CaLecRK-S.5-silenced plants showed reduced hypersensitive response, reactive oxygen species burst, secondary metabolite production, mitogen-activated protein kinase activation, and defense-related gene expression in response to Tobacco mosaic virus pathotype P0 (TMV-P0) infection...
October 2016: Journal of Experimental Botany
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