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Molecular Plant Pathology

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https://www.readbyqxmd.com/read/28093893/arabidopsis-thaliana-glutathione-s-transferase-theta-2-interacts-with-rsi1-fld-to-activate-systemic-acquired-resistance
#1
Zeeshan Zahoor Banday, Ashis Kumar Nandi
A partly infected plant develops systemic acquired resistance (SAR) and shows heightened resistance during subsequent infections. The infected parts generate certain mobile signals that travel to the distal tissues and help in activation of SAR. SAR is associated with epigenetic modifications of several defense-related genes. However, the mechanisms by which mobile signals contribute to epigenetic changes are little known. Previously we had shown that the Arabidopsis REDUCED SYSTEMIC IMMUNITY 1 (RSI1, alias FLOWERING LOCUS D; FLD), which codes for a putative histone demethylase is required for the activation of SAR...
January 17, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28093843/the-discovery-of-the-virulence-gene-toxa-in-the-wheat-and-barley-pathogen-bipolaris-sorokiniana
#2
Megan C Mcdonald, Dag Ahren, Steven Simpfendorfer, Andrew Milgate, Peter S Solomon
Bipolaris sorokiniana is the causal agent of multiple diseases on wheat and barley and is the primary constraint to cereal production throughout South Asia. Despite its significance, the molecular basis of disease is poorly understood. To address this, the genomes of three Australian isolates of B. sorokiniana were sequenced and screened for known pathogenicity genes. Sequence analysis revealed that the isolate BRIP10943 harboured the ToxA gene which was previously associated with disease in the wheat pathogens Parastagonospora nodorum and Pyrenophora tritici-repentis...
January 17, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28093838/fusaric-acid-contributes-to-virulence-of-fusarium-oxysporum-on-plant-and-mammalian-hosts
#3
Cristina López-Díaz, Vahid Rahjoo, Michael Sulyok, Veronica Ghionna, Adela Martín-Vicente, Javier Capilla, Antonio Di Pietro, Manuel S López-Berges
Fusaric acid (FA) is among the oldest identified secondary metabolites produced by Fusarium species, known for a long time to display strong phytotoxicity and moderate toxicity to animal cells; however, the cellular targets of FA as well as its function in fungal pathogenicity remain unknown. Here, we investigated the role of FA in Fusarium oxysporum, a soil-borne cross-kingdom pathogen that causes vascular wilt on more than a hundred plant species and opportunistic infections in humans. Targeted deletion of fub1, encoding a predicted orthologue of the polyketide synthase involved in FA biosynthesis in F...
January 17, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28056496/chloroplast-the-trojan-horse-in-plant-virus-interaction
#4
REVIEW
Dhriti Bhattacharyya, Supriya Chakraborty
Chloroplast is one of the most dynamic organelle of a plant cell. It carries out photosynthesis, synthesizes major phytohormones, takes active part in defence response, and is crucial for inter-organelle signaling. Viruses, on the other hand, are extremely strategic in manipulating the internal environment of the host cell. Chloroplast, a prime target for viruses, undergoes enormous structural and functional damage during viral infection. In fact, large proportions of affected gene products in a virus infected plant are closely associated to chloroplast and photosynthesis process...
January 5, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28056495/novel-rosaceae-plant-elicitor-peptides-as-sustainable-tools-to-control-xanthomonas-arboricola-pv-pruni-in-prunus-spp
#5
Cristina Ruiz, Anna Nadal, Emilio Montesinos, Maria Pla
Fruit crops are regarded as important health promoters and constitute a major part of global agricultural production, and Rosaceae species are of high economic impact. Their culture is threatened by bacterial diseases, which control is only based on preventive treatment with compounds with limited efficacy and a negative environmental impact. One of the most economically relevant examples is the pathogen Xanthomonas arboricola pv. pruni (Xap) affecting Prunus spp. Plant immune response against pathogens can be triggered and amplified by plant elicitor peptides (Peps), perceived by specific receptors (PEPRs)...
January 5, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28052479/a-thioredoxin-nbtrxh2-from-nicotiana-benthamiana-negatively-regulates-the-movement-of-bamboo-mosaic-virus
#6
I-Hsuan Chen, Hui-Ting Chen, Ying-Ping Huang, Hweng-Jan Huang, Lin-Ling Shenkwen, Yau-Heiu Hsu, Ching-Hsiu Tsai
An upregulated gene derived from Bamboo mosaic virus (BaMV)-infected Nicotiana benthamiana plant was cloned and characterized in this study; BaMV is a single-stranded positive-sense RNA virus. This gene product, designated as NbTRXh2, was matched with sequences of thioredoxin h proteins, a group of small proteins with a conserved active-site motif WCXPC conferring disulfide reductase activity. To examine how NbTRXh2 is involved in the infection cycle of BaMV, we used the virus-induced gene silencing technique to knock down NbTRXh2 expression in N...
January 3, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28026146/profiling-the-extended-phenotype-of-plant-pathogens
#7
REVIEW
Gail M Preston
One of the most fundamental questions in plant pathology is what determines whether a pathogen grows within a plant? This question is frequently studied in terms of the role of elicitors and pathogenicity factors in triggering or overcoming host defences. However, this focus fails to address the basic question of how the environment in host tissues acts to support or restrict pathogen growth. Efforts to understand this aspect of host-pathogen interactions are commonly confounded by several issues, including the complexity of the plant environment, the artificial nature of many experimental infection systems, and the fact that the physiological properties of a pathogen growing in association with a plant can be very different from the properties of that pathogen in culture...
December 27, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28026103/artificial-micrornas-and-synthetic-trans-acting-small-interfering-rnas-interfere-with-viroid-infection
#8
Alberto Carbonell, José-Antonio Daròs
Artificial microRNAs (amiRNAs) and synthetic trans-acting small interfering RNAs (syn-tasiRNAs) are two classes of artificial small RNAs (sRNAs) engineered to silence endogenous transcripts as well as viral RNAs in plants. Here, we explore the possibility of using amiRNAs and syn-tasiRNAs to specifically interfere with infections by viroids, small (250-400 nt) non-coding circular RNAs with compact secondary structure infecting a wide range of plant species. The combined use of recent high-throughput methods for artificial sRNA construct generation and of the Potato spindle tuber viroid (PSTVd)/Nicotiana benthamiana pathosystem allowed for the simple and time-effective screening of multiple artificial sRNAs targeting sites distributed along PSTVd RNAs of (+) or (-) polarity...
December 27, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28026097/barley-susceptibility-factor-racb-modulates-transcript-levels-of-signalling-protein-genes-in-compatible-interaction-with-blumeria-graminis-f-sp-hordei
#9
Vera Schnepf, A Corina Vlot, Karl Kugler, Ralph Hückelhoven
RHO (rat sarcoma homologue) GTPases are regulators of downstream transcriptional responses of eukaryotes to intracellular and extracellular stimuli. For plants, little is known about the function of Rho-like GTPases (called RACs [rat sarcoma-related C botulinum substrate] or ROPs [RHO of plants]) in transcriptional reprogramming of cells. However, in plant hormone response and innate immunity RAC/ROP proteins influence gene expression patterns. The barley RAC/ROP RACB is required for full susceptibility of barley to the powdery mildew fungus Blumeria graminis f...
December 27, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28019708/revealing-the-inventory-of-type-iii-effectors-in-pantoea-agglomerans-gall-forming-pathovars-by-using-draft-genome-sequences-and-a-machine-learning-approach
#10
Gal Nissan, Michael Gershovits, Michael Morozov, Laura Chalupowicz, Guido Sessa, Shulamit Manulis-Sasson, Isaac Barash, Tal Pupko
Pantoea agglomerans, a widespread epiphytic bacterium, has evolved into a hrp-dependent and host-specific gall-forming pathogen by acquiring a pathogenicity plasmid containing a type III secretion system (T3SS) and its effectors (T3Es). P. agglomerans pv. betae (Pab) elicits galls on beet (Beta vulgaris) and gypsophila (Gypsophila paniculata), whereas P. agglomerans pv. gypsophilae (Pag) incites galls on gypsophila and hypersensitive response (HR) on beet. Draft genome sequences were generated and employed in combination with a machine learning approach and a translocation assay into beet roots to identify the pools of T3Es in the two pathovars...
December 26, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27998012/high-resolution-mapping-of-the-recombination-landscape-of-the-phytopathogen-fusarium-graminearum-suggests-two-speed-genome-evolution
#11
Benoit Laurent, Christos Palaiokostas, Cathy Spataro, Magalie Moinard, Enric Zehraoui, Ross D Houston, Marie Foulongne-Oriol
Recombination is a major evolutionary force, increasing genetic diversity and permitting efficient coevolution of fungal pathogen(s) with their host(s). The ascomycete Fusarium graminearum is a devastating pathogen of cereal crops, and can contaminate food and feed with harmful mycotoxins. Previous studies suggest a high-adaptive potential of this pathogen, illustrated by an increase of pathogenicity and resistance to fungicides. In this study, we provide the first detailed picture of the crossovers events occurring during meiosis and discuss the role of recombination may play for pathogen evolution...
December 20, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27997767/characterization-of-silencing-suppressor-p24-of-grapevine-leafroll-associated-virus-2
#12
Mingjun Li, Jiao Zhang, Ming Feng, Xianyou Wang, Chen Luo, Qi Wang, Yuqin Cheng
Grapevine leafroll-associated virus 2 (GLRaV-2) p24 has been reported as an RNA-silencing suppressor (RSS). However, the mechanisms underlying p24's suppression of RNA silencing are unknown. Using Agrobacterium infiltration-mediated RNA-silencing assays, we showed that GLRaV-2 p24 is a strong RSS triggered by positive-sense GFP RNA, and that silencing suppression by p24 effectively blocks accumulation of small interfering RNAs. Deletion analyses showed that the region of amino acids 1-188, which contains all predicted α-helixes and β-strands, is required for p24's RSS activity...
December 20, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27997761/the-enemy-within-phloem-limited-pathogens
#13
REVIEW
Claire Bendix, Jennifer D Lewis
The growing impact of phloem-limited pathogens on high value crops has renewed interest in understanding how they cause disease. Although these pathogens cause substantial crop losses, many are poorly characterized. In this review, we present examples of phloem-limited pathogens that include intracellular bacteria with and without cell walls, and viruses. Phloem-limited pathogens have small genomes and lack many genes required for core metabolic processes, which is in part an adaptation to the unique phloem environment...
December 20, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27997759/down-regulation-of-cladofulvin-biosynthesis-is-required-for-biotrophic-growth-of-cladosporium-fulvum-on-tomato
#14
Scott Griffiths, Carl H Mesarich, Elysa J R Overdijk, Benedetta Saccomanno, Pierre J G M de Wit, Jérôme Collemare
Fungal biotrophy is associated with a reduced capacity to produce potentially toxic secondary metabolites (SMs). Yet, the genome of the biotrophic plant pathogen Cladosporium fulvum contains many SM biosynthetic gene clusters, with several related to toxin production. These gene clusters are, however, poorly expressed during colonisation of tomato. The sole detectable SM produced by C. fulvum during in vitro growth is the anthraquinone cladofulvin. Although this pigment is not detected in infected leaves, cladofulvin biosynthetic genes are expressed throughout the pre-penetration phase and during conidiation at the end of the infection cycle, but they are repressed during the biotrophic phase of tomato colonization...
December 20, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27935243/mocdc14-is-important-for-septation-during-conidiation-and-appressorium-formation-in-magnaporthe-oryzae
#15
Chaohui Li, Shulin Cao, Chengkang Zhang, Yonghui Zhang, Qiang Zhang, Jin-Rong Xu, Chenfang Wang
As a typical foliar pathogen, appressorium formation and penetration are critical steps in the infection cycle of Magnaporthe oryzae. Because appressorium formation and penetration are closely co-regulated with cell cycle and Cdc14 phosphatases have antagonistic relationship with CDKs on proteins related to mitotic exits and cytokinesis, in this study we functionally characterized the MoCDC14 gene in M. oryzae. The Mocdc14 deletion mutant was significantly reduced in growth rate and conidiation. It also was defective in septum formation and nuclear distribution...
December 9, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27925401/dickeya-dadantii-pectic-enzymes-necessary-for-virulence-are-also-responsible-for-activation-of-the-arabidopsis-thaliana-innate-immune-system
#16
Dominique Expert, Oriane Patrit, Vladimir E Shevchik, Claude Perino, Virginie Boucher, Creze Christophe, Estelle Wenes, Mathilde Fagard
Soft-rot diseases of plants attributed to Dickeya dadantii result from lysis of plant cell wall due to pectic enzymes released by the bacterial cell by a type II secretion system (T2SS). A. thaliana can express several lines of defence against this bacterium. We employed bacterial mutants with defective envelope structures or secreted proteins to examine early plant defence reactions. We focused on the production of AtrbohD-dependent ROS, callose deposition and cell death as indicators of these reactions. We observed a significant reduction in ROS and callose formation with a bacterial mutant where genes encoding five pectate lyases (Pels) were disrupted...
December 7, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27925369/conventional-and-unconventional-ubiquitination-in-plant-immunity
#17
REVIEW
Bangjun Zhou, Lirong Zeng
Ubiquitination is one of the most abundant types of protein post-translational modifications (PTMs) in plant cells. The importance of ubiquitination in the regulation of many aspects of plant immunity has been increasingly appreciated in recent years. Most of the studies linking ubiquitination to the plant immune system, however, have been focused on the E3 ubiquitin ligases and the conventional ubiquitination that leads to degradation of the substrate proteins by the 26S proteasome. By contrast, our knowledge about the role of unconventional ubiquitination that often plays non-degradative, regulatory role remains a significant gap...
December 7, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27911046/verticillium-dahliae-lysm-effectors-differentially-contribute-to-virulence-on-plant-hosts
#18
Anja Kombrink, Hanna Rovenich, Xiaoqian Shi-Kunne, Eduardo Rojas-Padilla, Grardy C M van den Berg, Emmanouil Domazakis, Ronnie de Jonge, Dirk-Jan Valkenburg, Andrea Sánchez-Vallet, Michael F Seidl, Bart P H J Thomma
Chitin-binding LysM effectors contribute to virulence of various plant pathogenic fungi that are causal agents of foliar diseases. Here, we report on LysM effectors of the soil-borne fungal vascular wilt pathogen Verticillium dahliae. Comparative genomics revealed three core LysM effectors that are conserved in a collection of V. dahliae strains. Remarkably, and in contrast to the previously studied LysM effectors of other plant pathogens, no expression of core LysM effectors was monitored in planta in a taxonomically diverse panel of host plants...
December 2, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27888554/a-high-resolution-genetic-map-of-the-cereal-crown-rot-pathogen-fusarium-pseudograminearum-provides-a-near-complete-genome-assembly
#19
Donald M Gardiner, Aurelie H Benfield, Jiri Stiller, Stuart Stephen, Karen Aitken, Chunji Liu, Kemal Kazan
Fusarium pseudograminearum is an important pathogen of wheat and barley, particularly in semi-arid environments. Previous genome assemblies for this organism were based entirely on short read data and are highly fragmented. In this work, a genetic map of F. pseudograminearum has been constructed for the first time based on a mapping population of 178 individuals. The genetic map, along with long read scaffolding of a short read-based genome assembly, was used to give a near complete assembly of the four F. pseudograminearum chromosomes...
November 26, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27885775/the-coffee-leaf-rust-pathogen-hemileia-vastatrix-one-and-a-half-centuries-around-the-tropics
#20
Pedro Talhinhas, Dora Batista, Inês Diniz, Ana Vieira, Diogo N Silva, Andreia Loureiro, Sílvia Tavares, Ana Paula Pereira, Helena G Azinheira, Leonor Guerra-Guimarães, Vítor Várzea, Maria do Céu Silva
Taxonomy and history: Hemileia vastatrix Berk. and Broome (Basidiomycota, Pucciniales) was described in 1869 in Eastern Africa and Ceylon as the agent of Coffee Leaf Rust and spread to all coffee cultivation areas worldwide. Major disease outbreaks in Asia, Africa and America caused and continue to cause severe yield losses, making this the most important disease of Arabica coffee, a cash crop for many tropical and sub-tropical countries. Life cycle and disease symptoms: Hemileia vastatrix is a hemicyclic fungus with the urediniosporic life cycle as its most important (if not only) source of inoculum...
November 25, 2016: Molecular Plant Pathology
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