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Molecular Plant-microbe Interactions: MPMI

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https://www.readbyqxmd.com/read/28323529/altered-expression-of-a-chloroplast-protein-affects-the-outcome-of-virus-and-nematode-infection
#1
Elena Ganusova, J Hollis Rice, Timothy Scott Carlew, Akshita Patel, Emmanuel Perrodin-Njoku, Tarek Hewezi, Tessa M Burch-Smith
The chloroplast-resident RNA helicase ISE2 (INCREASED SIZE EXCLUSION LIMIT 2) can modulate the formation and distribution of plasmodesmata and intercellular trafficking. We have determined that ISE2 expression is induced by viral infection. Therefore the responses of Nicotiana benthamiana plants with varying levels of ISE2 expression to infection by Tobacco mosaic virus (TMV) and Turnip mosaic virus (TuMV) were examined. Surprisingly, increased or decreased ISE2 expression led to faster viral systemic spread and is some cases enhanced systemic necrosis...
March 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28323528/plant-immunity-inducer-development-and-application
#2
Dewen Qiu, Yijie Dong, Yi Zhang, Shupeng Li, Fachao Shi
Plant immunity inducers represent a new and rapidly developing field in plant protection research. In this paper, we discuss recent research on plant immunity inducers and their development and applications in China. Plant immunity inducers include plant immunity-inducing proteins, chitosan oligosaccharides, and microbial inducers. These compounds and microorganisms can trigger defense responses and confer disease resistance in plants. We also describe the mechanisms of plant immunity inducers and how they promote plant health...
March 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28304228/induction-of-xa10-like-genes-in-rice-cultivar-nipponbare-confers-disease-resistance-to-rice-bacterial-blight
#3
Jun Wang, Dongsheng Tian, Keyu Gu, Xiaobei Yang, Lanlan Wang, Xuan Zeng, Zhongchao Yin
Bacterial blight of rice, caused by Xanthomonas oryzae pv. oryzae, is one of the most destructive bacterial diseases throughout the major rice growing regions in the world. The rice disease resistance (R) genes Xa10 confers race-specific disease resistance to X. oryzae pv. oryzae strains that deliver the corresponding transcription activator-like (TAL) effectors AvrXa10. Upon bacterial infection, AvrXa10 binds specifically to the effector binding element (EBE) in the promoter of the R gene and activates its expression...
March 17, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28296575/live-cell-imaging-reveals-the-relocation-of-dsrna-binding-proteins-upon-viral-infection
#4
Deborah Barton, Elke Roovers, Quentin Gouil, Guilherme C da Fonseca, Rodrigo S Reis, Craig Jackson, Robyn Overall, Adriana Fusaro, Peter Waterhouse
Viral infection triggers a range of plant responses such as the activation of the RNA interference (RNAi) pathway. The double-stranded RNA binding (DRB) proteins, DRB3 and DRB4, are part of this pathway and aid in defending against DNA and RNA viruses, respectively. Using live cell imaging, we show that DRB2, DRB3 and DRB5 relocate from their uniform cytoplasmic distribution to concentrated accumulation in nascent viral replication complexes (VRCs) that develop following cell invasion by viral RNA. Inactivation of the DRB3 gene in Arabidopsis, by T-DNA insertion, rendered these plants less able to repress RNA viral replication...
March 15, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28291380/beneficial-rhizobacterium-bacillus-amyloliquefaciens-sqr9-induces-plant-salt-tolerance-through-spermidine-production
#5
Lin Chen, Yunpeng Liu, Gengwei Wu, Nan Zhang, Qi-Rong Shen, Ruifu Zhang
The inoculation of plants with plant growth-promoting rhizobacterium (PGPR) has been an effective strategy for enhancing plant salt tolerance to diminish the loss of agricultural productivity caused by salt stress, but the signal transmitted from bacteria to the plant under salt stress is poorly understood. In this study, the salt tolerance of Arabidopsis thaliana and Zea mays was enhanced by inoculation with Bacillus amyloliquefaciens SQR9. Using dialysis bags with different molecular weight cutoffs, we sorted through the molecules secreted by SQR9 and found that spermidine is responsible for enhancing plant salt tolerance...
March 14, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28291379/characterization-of-vdasp-f2-secretory-factor-from-verticillium-dahliae-by-a-fast-and-easy-gene-knockout-system
#6
Chengjian Xie, Qiaoling Li, Xingyong Yang
The vascular wilt fungus Verticillium dahliae produces persistent resting structures known as microsclerotia, which enable long-term survival of this plant pathogen in soil. The completed genome sequence of V. dahliae has facilitated large-scale investigations of individual gene functions using gene-disruption strategies based on Agrobacterium tumefaciens-mediated transformation (ATMT). However, the construction of gene-deletion vectors and screening of deletion mutants have remained challenging in V. dahliae...
March 14, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28151048/below-ground-attack-by-the-root-knot-nematode-meloidogyne-graminicola-predisposes-rice-to-blast-disease
#7
Tina Kyndt, Henok Zemene Yimer, Ashley Haeck, Richard Raj Singh, David Devleesschauwer, Simon Denil, Tim De Meyer, Monica Höfte, Kristof Demeestere, Godelieve Gheysen
Magnaporthe oryzae (rice blast) and the root-knot nematode Meloidogyne graminicola are causing two of the most important pathogenic diseases jeopardizing rice production. Here, we show that root-knot nematode infestation on rice roots leads to important above-ground changes in plant immunity gene expression, which is correlated with significantly enhanced susceptibility to blast disease. A detailed metabolic analysis of oxidative stress responses and hormonal balances demonstrates that the above-ground tissues have a disturbed oxidative stress level, with accumulation of H2O2, as well as hormonal disturbances...
February 2, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28134574/ameliorates-of-salt-stress-on-bermudagrass-by-the-fungus-aspergillus-aculeatus
#8
Yan Xie, Shijuan Han, Xiaoning Li, Erick Amombo, Jinmin Fu
There is considerable evidence that plants' abiotic-stress tolerance can be evoked by the exploitation of globally abundant microbe. A.aculeatus, which was initially isolated from the rhizosphere of bermudagrass, has been shown to increase heavy metal tolerance in turfgrasses. Here, we report on the potential of A.aculeatus to induce tolerance to salt stress in bermudagrass. Physiological markers for salt stress, such as plant growth rate, lipid peroxidation, photosynthesis and ionic homeostasis were assessed...
January 30, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28121239/comparative-transcriptome-analyses-in-zymoseptoria-tritici-reveal-significant-differences-in-gene-expression-among-strains-during-plant-infection
#9
Javier Palma-Guerrero, Xin Ma, Stefano F F Torriani, Marcello Zala, Carolina Sardinha Francisco, Fanny Elisabeth Hartmann, Daniel Croll, Bruce A McDonald
Zymoseptoria tritici is an ascomycete fungus that causes Septoria tritici blotch, a globally distributed foliar disease on wheat. Z. tritici populations are highly polymorphic and exhibit significant quantitative variation for virulence. Despite its importance, the genes responsible for quantitative virulence in this pathogen remain largely unknown. We investigated the expression profiles of four Z. tritici strains differing in virulence in an experiment conducted under uniform environmental conditions. Transcriptomes were compared at four different infection stages to characterize the regulation of gene families thought to be involved in virulence and to identify new virulence factors...
January 25, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28118091/paraburkholderia-phytofirmans-psjn-protects-arabidopsis-thaliana-against-a-virulent-strain-of-pseudomonas-syringae-through-the-activation-of-induced-resistance
#10
Tania Timmermann, Grace Armijo, Raúl A Donoso, Aldo Seguel, Loreto Holuigue, Bernardo Gonzalez
Paraburkholderia phytofirmans PsJN is a plant growth-promoting rhizobacterium (PGPR) that stimulates plant growth and improves tolerance to abiotic stresses. This study analyzed whether strain PsJN can reduce plant disease severity and proliferation of the virulent strain Pseudomonas syringae pv tomato (Pst) DC3000 in Arabidopsis plants, through the activation of induced resistance. Arabidopsis plants previously exposed to strain PsJN showed a reduction in disease severity and pathogen proliferation in leaves compared to non-inoculated, infected plants...
January 24, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28095124/mlo-based-resistance-an-apparently-universal-weapon-to-defeat-powdery-mildew-disease
#11
Stefan Kusch, Ralph Panstruga
Loss-of-function mutations of the appropriate Mildew resistance locus o (Mlo) gene(s) 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 more than four decades. More recently, mlo-mediated resistance was discovered to be inducible in virtually every plant species of economical or scientific relevance...
January 17, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28072559/control-of-endophytic-frankia-sporulation-by-alnus-nodule-metabolites
#12
Anne-Emmanuelle Hay De-Bettignies, Hasna Boubakri, Antoine Buonomo, Marjolaine Rey, Guillaume Meiffren, Laetitia Cotin-Galvan, Gilles Comte, Aude Herrera-Belaroussi
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...
January 10, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28068194/the-erf-required-for-nodulation1-ern1-transcription-factor-is-required-for-infection-thread-formation-in-lotus-japonicus
#13
Yasuyuki Kawaharada, Euan K James, Simon Kelly, Niels Sandal, Jens Stougaard
Several hundred genes are transcriptionally regulated during infection thread formation and development of nitrogen fixing root nodules. We have characterized a set of Lotus japonicus mutants impaired in root nodule formation and found that the causative gene, Ern1, encodes a protein with a characteristic APETALA2/Ethylene Responsive Factor (AP2/ERF) transcription factor domain. Phenotypic characterisation of four ern1 alleles shows that infection pockets are formed but root hair infection threads are absent...
January 9, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28051350/can-plant-microbiome-studies-lead-to-effective-biocontrol-of-plant-diseases
#14
Jeffrey Ellis
In this commentary I question the wisdom and efficacy of studies seeking disease attenuating microbes and microbiomes only in healthy plant communities and posit the alternative view that success in biocontrol of crop diseases may come also come from studies of microbiota, or at least individual species isolates, associated with diseased plants. In support of this view I summarise the current extensive knowledge of the biology behind what is probably the most successful biocontrol of a plant disease, namely the biocontrol of crown gall of stone fruit using non-pathogenic Rhizobium rhizogenes strain K84 (New and Kerr, 1972; Kerr, 2016) where the biocontrol agent itself came from a diseased plant...
January 4, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28301313/erratum-proteomics-analysis-of-the-regulatory-role-of-rpf-dsf-cell-to-cell-signaling-system-in-the-virulence-of-xanthomonas-campestris
#15
(no author information available yet)
No abstract text is available yet for this article.
February 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28301312/identification-of-two-meloidogyne-hapla-genes-and-an-investigation-of-their-roles-in-the-plant-nematode-interaction
#16
Cynthia Gleason, Frederik Polzin, Samer S Habash, Lei Zhang, Jan Utermark, Florian M W Grundler, Abdelnaser Elashry
Root-knot nematodes are soil-borne pathogens that invade and establish feeding sites in plant roots. They have an extremely broad host range, including most vascular plants. During infection of a susceptible host, root-knot nematodes secrete molecules called effectors that help them establish an intimate interaction with the plant and, at the same time, allow them to evade or suppress plant immune responses. Despite the fact that Meloidogyne hapla is a significant pest on several food crops, no effectors have been characterized from this root-knot nematode species thus far...
February 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28054497/the-lipopolysaccharide-lipid-a-long-chain-fatty-acid-is-important-for-rhizobium-leguminosarum-growth-and-stress-adaptation-in-free-living-and-nodule-environments
#17
Dianna V Bourassa, Elmar L Kannenberg, D Janine Sherrier, R Jeffrey Buhr, Russell W Carlson
Rhizobium bacteria live in soil and plant environments, are capable of inducing symbiotic nodules on legumes, invade these nodules, and develop into bacteroids that fix atmospheric nitrogen into ammonia. Rhizobial lipopolysaccharide (LPS) is anchored in the bacterial outer membrane through a specialized lipid A containing a very long-chain fatty acid (VLCFA). VLCFA function for rhizobial growth in soil and plant environments is not well understood. Two genes, acpXL and lpxXL, encoding acyl carrier protein and acyltransferase, are among the six genes required for biosynthesis and transfer of VLCFA to lipid A...
February 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28051349/a-suite-of-receptor-like-kinases-and-a-putative-mechano-sensitive-channel-are-involved-in-autoimmunity-and-plasma-membrane-based-defenses-in-arabidopsis
#18
Zhongqin Zhang, Chika Tateda, Shang-Chuan Jiang, Jay Shrestha, Joanna Jelenska, DeQuantarius J Speed, Jean T Greenberg
In plants, cell surface pattern recognition receptors (PRRs) provide a first line of defense against pathogens. Although each PRR recognizes a specific ligand, they share common signaling outputs, such as callose and other cell wall-based defenses. Several PRRs are also important for callose induction in response to the defense signal salicylic acid (SA). The extent to which common components are needed for PRR signaling outputs is not known. The gain-of-function Arabidopsis mutant of ACCELERATED CELL DEATH6 (ACD6) acd6-1 shows constitutive callose production that partially depends on PRRs...
February 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28027026/host-tissue-environment-directs-activities-of-an-epichlo%C3%A3-endophyte-while-it-induces-systemic-hormone-and-defense-responses-in-its-native-perennial-ryegrass-host
#19
Jan Schmid, Robert Day, Ningxin Zhang, Pierre-Yves Dupont, Murray P Cox, Christopher L Schardl, Niki Minards, Mauro Truglio, Neil Moore, Daniel R Harris, Yanfei Zhou
Increased resilience of pasture grasses mediated by fungal Epichloë endophytes is crucial to pastoral industries. The underlying mechanisms are only partially understood and likely involve very different activities of the endophyte in different plant tissues and responses of the plant to these. We analyzed the transcriptomes of Epichloë festucae and its host, Lolium perenne, in host tissues of different function and developmental stages. The endophyte contributed approximately 10× more to the transcriptomes than to the biomass of infected tissues...
February 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28027025/fall-armyworm-associated-gut-bacteria-modulate-plant-defense-responses
#20
Flor E Acevedo, Michelle Peiffer, Ching-Wen Tan, Bruce A Stanley, Anne Stanley, Jie Wang, Asher G Jones, Kelli Hoover, Cristina Rosa, Dawn Luthe, Gary Felton
Mechanical damage caused by insect feeding along with components present in insect saliva and oral secretions are known to induce jasmonic acid-mediated defense responses in plants. This study investigated the effects of bacteria from oral secretions of the fall armyworm Spodoptera frugiperda on herbivore-induced defenses in tomato and maize plants. Using culture-dependent methods, we identified seven different bacterial isolates belonging to the family Enterobacteriacea from the oral secretions of field-collected caterpillars...
February 2017: Molecular Plant-microbe Interactions: MPMI
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