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Molecular Plant-microbe Interactions: MPMI

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https://www.readbyqxmd.com/read/28635519/the-elicitor-protein-ases-induces-a-sar-response-accompanied-by-systemic-microbursts-and-micro-hrs-in-fragaria-ananassa
#1
Verónica Hael Conrad, Silvia Marisa Perato, Marta Elena Arias, Martín Gustavo Martínez Zamora, Pía de Los Ángeles Di Peto, Gustavo Gabriel Martos, Atilio Pedro Castagnaro, Juan Carlos Diaz-Ricci, Nadia Regina Chalfoun
The elicitor AsES (Acremonium strictum Elicitor Subtilisin) is a 34 KDa subtilisin-like protein secreted by the opportunistic fungus Acremonium strictum. AsES activates the innate immunity and confers resistance against anthracnose and grey mold diseases in strawberry plants (Fragaria x ananassa Duch.) and the last disease also in Arabidopsis. In the present work, we show that upon AsES recognition, a cascade of defense responses is activated, including: calcium influx, biphasic oxidative burst (O2(.-) and H2O2), HR response, accumulation of autofluorescent compounds, cell wall reinforcement with callose and lignin deposition, salicylic acid accumulation, and expression of defense-related genes such as FaPR1, FaPG1, FaMYB30, FaRBOH-D, FaRBOH-F, FaCHI23 and FaFLS...
June 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28430084/the-spo0a-sini-sinr-regulatory-circuit-plays-an-essential-role-in-biofilm-formation-nematicidal-activities-and-plant-protection-in-bacillus-cereus-ar156
#2
Sunde Xu, Nan Yang, Shiyu Zheng, Fang Yan, Chunhao Jiang, Yiyang Yu, Jianhua Guo, Yunrong Chai, Yun Chen
The rhizosphere bacterium Bacillus cereus AR156 is capable of forming biofilms, killing nematodes, and protecting plants. However, the underlying molecular mechanisms of these processes are not well understood. In this study, we found that the isogenic mutants ΔBcspo0A and ΔBcsinI have significantly reduced colonization and nematicidal activity in vitro and biological control efficacy on the tomato plant under greenhouse conditions. We further investigated the role of the spo0A-sinI-sinR regulatory circuit in biofilm formation, killing against nematodes, and biological control in AR156...
June 19, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28609214/the-potyvirus-particle-recruits-the-plant-translation-initiation-factor-eif4e-by-means-of-the-vpg-covalently-linked-to-the-viral-rna
#3
Geneviève Tavert-Roudet, Agnès Anne, Amandine Barra, Arnaud Chovin, Christophe Demaille, Thierry Michon
The VPg of potyviruses is a protein covalently linked to the 5' end of viral RNA. It interacts with eIF4E, a component of the cellular translation initiation complex. It has been suggested that the 5' RNA linked VPg could mimic the cellular mRNA cap, promoting synthesis of viral proteins. We report here evidences for evidence for recruitment of the plant eIF4E by Lettuce mosaic virus (LMV, potyvirus) particles via the 5' RNA linked VPg. Analysis of the viral population was performed by ELISA-based tests, either with crude extracts of LMV-infected tissues or purified viral particles...
June 13, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28488467/-candidatus-liberibacter-asiaticus-encodes-a-functional-salicylic-acid-sa-hydroxylase-that-degrades-sa-to-suppress-plant-defenses
#4
Jinyun Li, Zhiqian Pang, Pankaj Trivedi, Xiaofeng Zhou, Xiaobao Ying, Hongge Jia, Nian Wang
Pathogens from the fastidious, phloem-restricted 'Candidatus Liberibacter' species cause the devastating Huanglongbing (HLB) disease in citrus worldwide and cause diseases on many solanaceous crops and plants in the Apiaceae family. However, little is known about the pathogenic mechanisms due to the difficulty in culturing the corresponding 'Ca. Liberibacter' species. Here, we report that the citrus HLB pathogen 'Ca. L. asiaticus' uses an active salicylate hydroxylase SahA to degrade salicylic acid (SA) and suppress plant defenses...
June 13, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28598263/the-phenylalanine-ammonia-lyase-gene-ljpal1-is-involved-in-plant-defense-responses-to-pathogens-and-plays-diverse-roles-in-lotus-japonicus-rhizobium-symbioses
#5
Yaping Chen, Fengjiao Li, Lu Tian, Mingchao Huang, Rufang Deng, Xueliu Li, Wei Chen, Pingzhi Wu, Meiru Li, Huawu Jiang, Guojiang Wu
Phenylalanine ammonia-lyase (PAL) is important in the biosynthesis of plant secondary metabolites that regulate growth responses. Although its function is well established in various plants, the functional significance of PAL genes in nodulation is poorly understood. Here, we demonstrate that the Lotus japonicus PAL (LjPAL1) gene is induced by Mesorhizobium loti (M. loti) infection and MeJA treatment in roots. LjPAL1 altered PAL activity, leading to changes in lignin contents and thicknesses of cell walls in roots and nodules of transgenic plants, and hence to structural changes in roots and nodules...
June 9, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28598262/strigolactones-in-the-rhizosphere-friend-or-foe
#6
Carolien De Cuyper, Sofie Goormachtig
Strigolactones are well-known endogenous plant hormones that play a major role in planta by influencing different physiological processes. Moreover, ex planta, strigolactones are important signaling molecules in root exudates and function as host detection cues to launch mutualistic interactions with arbuscular mycorrhizal fungi in the rhizosphere. However, parasitic plants belonging to the Orobanchaceae family hijacked this communication system to stimulate their seed germination when in close proximity to the roots of a suitable host...
June 9, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28488468/functional-characterization-of-key-residues-in-regulatory-proteins-hrpg-and-hrpv-of-pseudomonas-syringae-pv-tomato-dc3000
#7
Milija Jovanovic, Christopher Waite, Ellen James, Nicholas Synn, Timothy Simpson, Ioly Kotta-Loizou, Martin Buck
The plant pathogen Pseudomonas syringae pv. tomato DC3000 uses a type III secretion system (T3SS) to transfer effector proteins into the host. The expression of T3SS proteins is controlled by the HrpL σ factor. Transcription of hrpL is σ(54)-dependent and bacterial enhancer-binding proteins HrpR and HrpS coactivate the hrpL promoter. The HrpV protein imposes negative control upon HrpR and HrpS through direct interaction with HrpS. HrpG interacts with HrpV and relieves such negative control. The sequence alignments across Hrp group I-type plant pathogens revealed conserved HrpV and HrpG amino acids...
June 7, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28585451/a-three-way-transcriptomic-interaction-study-of-a-biocontrol-agent-clonostachys-rosea-a-fungal-pathogen-helminthosporium-solani-and-a-potato-host-solanum-tuberosum
#8
Erik Lysøe, Merete W Dees, May Bente Brurberg
Helminthosporium solani causes silver scurf, which affects the quality of potato. The biocontrol agent Clonostachys rosea greatly limited the severity of silver scurf symptoms and amount of H. solani genomic DNA in laboratory experiments. Transcriptomic analysis during interaction showed that H. solani gene expression was highly reduced when coinoculated with the biocontrol agent C. rosea, whereas gene expression of C. rosea was clearly boosted as a response to the pathogen. The most notable upregulated C. rosea genes were those encoding proteins involved in cellular response to oxidative stress, proteases, G-protein signaling, and the methyltransferase LaeA...
June 6, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28535079/the-tomato-kinase-pti1-contributes-to-production-of-reactive-oxygen-species-in-response-to-two-flagellin-derived-peptides-and-promotes-resistance-to-pseudomonas-syringae-infection
#9
Simon Schwizer, Christine M Kraus, Diane M Dunham, Yi Zheng, Noe Fernandez-Pozo, Marina A Pombo, Zhangjun Fei, Suma Chakravarthy, Gregory Martin
The Pti1 kinase was identified from a reverse genetic screen as contributing to pattern-triggered immunity (PTI) against Pseudomonas syringae pv. tomato (Pst). This was unexpected because Pti1 was originally identified as an interactor of the Pto kinase and was implicated in effector-triggered immunity. The tomato genome has two Pti1 genes, referred to as Pti1a and Pti1b. A hairpin-Pti1 (hpPti1) construct was developed and used to generate two independent stable transgenic tomato lines, which had reduced transcript abundance of both genes...
May 23, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28535078/complementation-of-ctb7-in-the-maize-pathogen-cercospora-zeina-overcomes-the-lack-of-in-vitro-cercosporin-production
#10
Velushka Swart, Bridget Genevieve Crampton, John Ridenour, Burton Bluhm, Nicholas Olivier, Marion Meyer, Dave Kenneth Berger
Gray leaf spot (GLS), caused by the sibling species Cercospora zeina or Cercospora zeae-maydis, is cited as one of the most important diseases threatening global maize production. C. zeina fails to produce cercosporin in vitro, and in most cases causes large coalescing lesions during maize infection; a symptom generally absent from cercosporin-deficient mutants in other Cercospora spp. Here we describe the C. zeina cercosporin toxin biosynthetic gene cluster. The oxidoreductase gene CTB7 contained several insertions and deletions as compared to the C...
May 23, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28517960/a-rapid-seedling-resistance-assay-identifies-wild-tomato-lines-that-are-resistant-to-pseudomonas-syringae-pv-tomato-race-1
#11
Jana A Hassan, Yan-Ming Jane Zhou, Jennifer D Lewis
Bacterial speck caused by Pseudomonas syringae has historically been controlled by the Pto/Prf gene cluster. Emerging strains like P. syringae pv. tomato (Pst) race 1 overcome resistance conferred by Pto/Prf, and can cause serious crop loss under appropriate environmental conditions. We developed a rapid assay to screen wild tomato seedlings for resistance to Pst race 1. We established the seedling resistance assay using the well-characterized Pst race 0 strain, PstDC3000, that is recognized in tomato cultivars carrying Pto/Prf (PtoR) and causes disease in isogenic lines lacking this cluster (PtoS)...
May 18, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28510485/metabolomic-response-to-huanglongbing-role-of-carboxylic-compounds-in-citrus-sinensis-response-to-candidatus-liberibacter-asiaticus-and-its-vector-diaphorina-citri
#12
Nabil Killiny, Yasser Nehela
Huanglongbing, a destructive disease of citrus, is caused by the fastidious bacterium, Candidatus Liberibacter asiaticus (CLas), and transmitted by Asian citrus psyllid, Diaphorina citri. The impact of CLas-infection and/or D. citri-infestation on Valencia sweet orange (Citrus sinensis) leaf metabolites was investigated using GC-MS, followed by gene expression analysis for 37 genes involved in jasmonic acid (JA), salicylic acid (SA), and proline-glutamine pathways. The total amino acid abundance increased after CLas-infection, while the total fatty acids increased dramatically after infestation with D...
May 16, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28510484/ethylene-signalling-is-important-for-isoflavonoid-mediated-resistance-to-rhizoctonia-solani-in-roots-of-medicago-truncatula
#13
Yao Liu, Samira Hassan, Brendan N Kidd, Gagan Garg, Ulrike Mathesius, Karam B Singh, Jonathan Anderson
The root-infecting necrotrophic fungal pathogen Rhizoctonia solani causes significant disease to all the world's major food crops. As a model for pathogenesis of legumes, we have examined the interaction of R. solani AG8 with Medicago truncatula. RNAseq analysis of the moderately resistant M. truncatula accession A17 and highly susceptible sickle (skl) mutant (defective in ethylene sensing) identified major early transcriptional reprogramming in A17. Responses specific to A17 included components of ethylene signalling, reactive oxygen species metabolism and consistent up-regulation of the isoflavonoid biosynthesis pathway...
May 16, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28459172/chloroplast-hsp70-isoform-is-required-for-age-dependent-tissue-preference-of-bamboo-mosaic-virus-in-mature-nicotiana-benthamiana-leaves
#14
Ying-Wen Huang, Chung-Chi Hu, Ching-Hsiu Tsai, Na-Sheng Lin, Yau-Heiu Hsu
Plant viruses may exhibit age-dependent tissue preference in their hosts, but the underlying mechanism(s) are not well understood. In this study, we provide several lines of evidence to reveal the determining role of a protein of the Nicotiana benthamiana chloroplast Hsp70 (NbcpHsp70) family, NbcpHsp70-2, involved in the preference of Bamboo mosaic virus (BaMV) to infect older tissues. NbcpHsp70 family proteins were identified in complexes pulled down with BaMV replicase as the bait. Among the isoforms of NbcpHsp70, only the specific silencing of NbcpHsp70-2 resulted in the significant decrease of BaMV RNA in N...
May 1, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28095124/mlo-based-resistance-an-apparently-universal-weapon-to-defeat-powdery-mildew-disease
#15
Stefan Kusch, Ralph Panstruga
Loss-of-function mutations of one or more of the appropriate Mildew resistance locus o (Mlo) genes are an apparently reliable "weapon" to protect plants from infection by powdery mildew fungi, as they confer durable broad-spectrum resistance. Originally detected as a natural mutation in an Ethiopian barley landrace, this so-called mlo-based resistance has been successfully employed in European barley agriculture for nearly four decades. More recently, mlo-mediated resistance was discovered to be inducible in virtually every plant species of economic or scientific relevance...
March 30, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28072559/control-of-endophytic-frankia-sporulation-by-alnus-nodule-metabolites
#16
Hay Anne-Emmanuelle, Boubakri Hasna, Buonomo Antoine, Rey Marjolaine, Meiffren Guillaume, Cotin-Galvan Laetitia, Comte Gilles, Herrera-Belaroussi Aude
A unique case of microbial symbiont capable of dormancy within its living host cells has been reported in actinorhizal symbioses. Some Frankia strains, named Sp+, are able to sporulate inside plant cells, contrarily to Sp- strains. The presence of metabolically slowed-down bacterial structures in host cells alters our understanding of symbiosis based on reciprocal benefits between both partners, and its impact on the symbiotic processes remains unknown. The present work reports a metabolomic study of Sp+ and Sp- nodules (from Alnus glutinosa), in order to highlight variabilities associated with in-planta sporulation...
March 30, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28562158/sulfate-binding-protein-sbp-from-xanthomonas-citri-structure-and-functional-insights
#17
Cristiane Tambascia Pereira, Cássia Roesler, Jéssica Nascimento Faria, Melissa Regina Fessel, Andrea Balan
The uptake and transport of sulfate in bacteria is mediated by an ATP-binding cassette transporter (ABC transporter) encoded by sbpcysUWA genes, whose importance has been widely demonstrated due to their relevance in cysteine synthesis and bacterial growth. In Xanthomonas citri, the causative agent of canker disease, the expression of components from this ABC transporter and others related to uptake of organic sulfur sources has been shown during in vitro growth cultures. In this work, based on gene reporter and proteomics analyses, we showed the activation of the promoter that controls the sbpcysUWA operon in vitro and in vivo and the expression of sulfate-binding protein (Sbp), a periplasmic-binding protein, indicating that this protein plays an important function during growth and that the transport system is active during Citrus sinensis infection...
July 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28548604/quorum-sensing-systems-in-the-plant-growth-promoting-bacterium-paraburkholderia-phytofirmans-psjn-exhibit-cross-regulation-and-are-involved-in-biofilm-formation
#18
Ana Zúñiga, Raúl A Donoso, Daniela Ruiz, Gonzalo A Ruz, Bernardo González
Quorum-sensing systems play important roles in host colonization and host establishment of Burkholderiales species. Beneficial Paraburkholderia species share a conserved quorum-sensing (QS) system, designated BraI/R, that controls different phenotypes. In this context, the plant growth-promoting bacterium Paraburkholderia phytofirmans PsJN possesses two different homoserine lactone QS systems BpI.1/R.1 and BpI.2/R.2 (BraI/R-like QS system). The BpI.1/R.1 QS system was previously reported to be important to colonize and produce beneficial effects in Arabidopsis thaliana plants...
July 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28510502/the-impact-of-steroidal-glycoalkaloids-on-the-physiology-of-phytophthora-infestans-the-causative-agent-of-potato-late-blight
#19
Paul Dahlin, Marion C Müller, Sophia Ekengren, Lauren S McKee, Vincent Bulone
Steroidal glycoalkaloids (SGAs) are plant secondary metabolites known to be toxic to animals and humans and that have putative roles in defense against pests. The proposed mechanisms of SGA toxicity are sterol-mediated disruption of membranes and inhibition of cholinesterase activity in neurons. It has been suggested that phytopathogenic microorganisms can overcome SGA toxicity by enzymatic deglycosylation of SGAs. Here, we have explored SGA-mediated toxicity toward the invasive oomycete Phytophthora infestans, the causative agent of the late blight disease in potato and tomato, as well as the potential for SGA deglycosylation by this species...
July 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28504560/small-rna-functions-are-required-for-growth-and-development-of-magnaporthe-oryzae
#20
Vidhyavathi Raman, Stacey A Simon, Feray Demirci, Mayumi Nakano, Blake C Meyers, Nicole M Donofrio
RNA interference (RNAi) is conserved in eukaryotic organisms, and it has been well studied in many animal and plant species and some fungal species, yet it is not well studied in fungal plant pathogens. In the rice blast fungus Magnaporthe oryzae, we examined small RNA (sRNA) and their biogenesis in the context of growth and pathogenicity. Through genetic and genomic analyses, we demonstrate that loss of a single gene encoding Dicer, RNA-dependent RNA polymerase, or Argonaute reduces sRNA levels. These three proteins are required for the biogenesis of sRNA-matching genome-wide regions (coding regions, repeats, and intergenic regions)...
July 2017: Molecular Plant-microbe Interactions: MPMI
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