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Molecular Plant-microbe Interactions: MPMI

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https://www.readbyqxmd.com/read/28726589/proteomic-study-of-sumoylation-during-solanum-tuberosum-phytophthora-infestans-in-compatible-interactions
#1
Bertrand Colignon, Marc Dieu, Catherine Demazy, Edouard Delaive, Yordan Muhovski, Martine Raes, Sergio Mauro
Invasive plant pathogens have developed the ability to modify the metabolism of their host, promoting metabolic processes which facilitate the growth of the pathogen; at the general expense of the host. The particular enzymatic process SUMOylation which performs post-translational modification of target proteins, leading to changes in many aspects of protein activity and hence metabolism has been demonstrated to be active in many eukaryotic organisms, both animals and plants. Here we provide experimental evidence which indicates that in leaves of Solanum tuberosum which have been infected by Phytophthora infestans, the SUMO pathway enzymes of the host are partially under transcriptional control exerted by the oomycete...
July 20, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28598262/strigolactones-in-the-rhizosphere-friend-or-foe
#2
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...
July 18, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28703029/hop-stunt-viroid-effect-on-host-humulus-lupulus-transcriptome-and-its-interactions-with-hop-powdery-mildew-podospheara-macularis
#3
Madhu Kappagantu, Jeff M Bullock, Mark Elmer Nelson, Kenneth C Eastwell
Viroids are the smallest known plant pathogens that exploit host systems for their replication, and cause diseases in many hosts. In this study, the host response of hop plants to Hop stunt viroid (HSVd) infection was studied through transcriptome analysis. RNA sequence analysis of hop leaves infected with HSVd revealed dynamic changes in hop gene expression. Defense-related genes, genes involved in lipid and terpenoid metabolism are the major categories that showed differential expression due to HSVd infection...
July 13, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28703028/the-sal-pap-chloroplast-retrograde-pathway-contributes-to-plant-immunity-by-regulating-glucosinolate-pathway-and-phytohormone-signaling
#4
Yasuhiro Ishiga, Mutsumi Watanabe, Takako Ishiga, Takayuki Tohge, Takakazu Matsuura, Yoko Ikeda, Rainer Hofgen, Alisdair R Fernie, Kirankumar S Mysore
Chloroplasts have a crucial role in plant immunity against pathogens. Increasing evidence suggests that phytopathogens target chloroplast homeostasis as a pathogenicity mechanism. In order to regulate the performance of chloroplasts under stress conditions, chloroplasts produce retrograde signals to alter nuclear gene expression. Many signals for the chloroplast retrograde pathway have been identified including chlorophyll intermediates, reactive oxygen species (ROS), and metabolic retrograde signals. Although there is reasonably a good understanding of chloroplast retrograde signaling in plant immunity, some signals are not well understood...
July 13, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28682158/recombination-of-virulence-genes-in-divergent-acidovorax-avenae-strains-that-infect-a-common-host
#5
Quan Zeng, Jie Wang, Frederic Bertels, Paul Giordano, Martin I Chilvers, Regan B Huntley, Joseph M Vargas, George W Sundin, Janette L Jacobs, Ching-Hong Yang
Bacterial etiolation and decline (BED), caused by Acidovorax avenae, is an emerging disease of creeping bentgrass on golf courses in the United States of America. We performed the first comprehensive analysis of A. avenae on a nationwide collection of turfgrass and maize pathogenic A. avenae. Surprisingly, our results reveal that the turfgrass pathogenic A. avenae in North America are not only highly divergent but also belong to two distinct phylogroups. Both phylogroups specifically infect turfgrass but are more closely related to maize pathogens, than to each other...
July 6, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28682157/whole-genome-sequences-of-the-raspberry-and-strawberry-pathogens-phytophthora-rubi-and-p-fragariae
#6
Javier Tabima, Brent Kronmiller, Caroline Press, Brett M Tyler, Inga Zasada, Niklaus J Grünwald
Phytophthora rubi and P. fragariae are two closely related oomycete plant pathogens that exhibit strong morphological and physiological similarities, but are specialized to infect different hosts of economic importance, namely raspberry and strawberry. Here, we report the draft genome sequences of these two Phytophthora species as a first step towards understanding the genomic processes underlying plant host adaptation in these pathogens.
July 6, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28677494/genomic-analysis-of-clavibacter-michiganensis-reveals-insight-into-virulence-strategies-and-genetic-diversity-of-a-gram-positive-bacterial-pathogen
#7
Shree P Thapa, Sivakumar Pattathil, Michael Hahn, Marie-Agnès Jacques, Bob Gilbertson, Gitta Coaker
Clavibacter michiganensis subsp. michiganensis (Cmm) is a Gram-positive bacterial pathogen that proliferates in the xylem vessels of tomato, causing bacterial canker disease. In this study, we sequenced and assembled genomes of 11 Cmm strains isolated from infected tomato fields in California as well as five Clavibacter strains that colonize tomato endophytically but are not pathogenic in this host. The analysis of the Cmm genomes supported the monophyletic nature of this pathogen, but revealed genetic diversity among strains, consistent with multiple introduction events...
July 5, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28677493/dynamic-changes-in-the-rice-blast-population-in-the-usa-over-six-decades
#8
Xueyan Wang, Yulin Jia, Yeshi Wamishe, Melissa H Jia, Barbara Valent
Rice blast disease caused by Magnaporthe oryzae (Mo) is one of the most destructive diseases of rice. Field isolates of Mo rapidly adapt to their hosts and climate. Tracking the genetic and pathogenic variability of field isolates is essential to understand how Mo interacts with hosts and environments. In this study, a total of 1022 US field isolates collected from 1959 to 2015 were analyzed for pathogenicity toward 8 international rice differentials (IRD). A sub-set of 457 isolates was genotyped with 10 polymorphic simple sequence repeat (SSR) markers...
July 5, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28657425/the-regulatory-network-controlling-ethanol-induced-expression-of-alcohol-dehydrogenase-in-the-endophyte-azoarcus-sp-strain-bh72
#9
Andrea Krause, Henrike Julich, Manasee Mankar, Barbara Reinhold-Hurek
The habitat of the nitrogen-fixing endophyte Azoarcus sp. strain BH72 is grass roots grown under waterlogged conditions which produce under these conditions ethanol. To metabolise ethanol, Azoarcus is with eight alcohol dehydrogenases (ADHs) well equipped, of which ExaA2 and ExaA3 are the most relevant ones. exaA2 and exaA3 are clustered surrounded by genes encoding two-component regulatory systems (TCSs) termed ExaS-ExaR and ElmS-GacA. Functional genomic analyses revealed (1) that expression of the corresponding genes was induced by ethanol, (2) that the genes were also expressed in the rhizoplane or even inside of rice roots, (3) that both TCSs were indispensable for growth on ethanol, and (4) that they were important for competitiveness during rice root colonisation...
June 28, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28635519/the-elicitor-protein-ases-induces-a-sar-response-accompanied-by-systemic-microbursts-and-micro-hrs-in-fragaria-ananassa
#10
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/28609214/the-potyvirus-particle-recruits-the-plant-translation-initiation-factor-eif4e-by-means-of-the-vpg-covalently-linked-to-the-viral-rna
#11
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/28598263/the-phenylalanine-ammonia-lyase-gene-ljpal1-is-involved-in-plant-defense-responses-to-pathogens-and-plays-diverse-roles-in-lotus-japonicus-rhizobium-symbioses
#12
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/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
#13
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
#14
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
#15
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/28510484/ethylene-signalling-is-important-for-isoflavonoid-mediated-resistance-to-rhizoctonia-solani-in-roots-of-medicago-truncatula
#16
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/28585451/a-three-way-transcriptomic-interaction-study-of-a-biocontrol-agent-clonostachys-rosea-a-fungal-pathogen-helminthosporium-solani-and-a-potato-host-solanum-tuberosum
#17
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...
August 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
#18
Nabil Killiny, Yasser Nehela
Huanglongbing, a destructive disease of citrus, is caused by the fastidious bacterium 'Candidatus Liberibacter asiaticus' and transmitted by Asian citrus psyllid, Diaphorina citri. The impact of 'Ca. L. asiaticus' infection or D. citri infestation on Valencia sweet orange (Citrus sinensis) leaf metabolites was investigated using gas chromatography mass spectrometry, 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 'Ca...
August 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
#19
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...
August 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
#20
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...
August 2017: Molecular Plant-microbe Interactions: MPMI
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