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Molecular Plant-microbe Interactions: MPMI

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https://www.readbyqxmd.com/read/28437167/the-fgvps39-fgvam7-fgsso1-complex-mediates-vesicle-trafficking-and-is-important-for-the-development-and-virulence-of-fusarium-graminearum
#1
Bing Li, Luping Liu, Ying Li, Xin Dong, Haifeng Zhang, Huaigu Chen, Xiaobo Zheng, Zhengguang Zhang
Vesicle trafficking is an important event in eukaryotic organisms. Many proteins and lipids transported between different organelles or compartments are essential for survival. These processes are mediated by soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins, Rab-GTPases, and multisubunit tethering complexes such as class C core vacuole or endosome tethering and homotypic fusion or vacuole protein sorting (HOPS). Our previous study has demonstrated that FgVam7, which encodes a SNARE protein involving in vesicle trafficking, plays crucial roles in growth, asexual or sexual development, deoxynivalenol production, and pathogenicity in Fusarium graminearum...
April 24, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28437159/specific-host-responsive-associations-between-medicago-truncatula-accessions-and-sinorhizobium-strains
#2
Théophile Kazmierczak, Marianna Nagymihály, Florian Lamouche, Quentin Barrière, Ibtissem Guefrachi, Benoit Alunni, Mouna Ouadghiri, Jamal Ibijbijen, Éva Kondorosi, Peter Mergaert, Véronique Gruber
Legume plants interact with rhizobia to form nitrogen-fixing root nodules. Legume-rhizobium interactions are specific and only compatible rhizobia and plant species will lead to nodule formation. Even within compatible interactions, the genotype of both the plant and the bacterial symbiont will impact on the efficiency of nodule functioning and nitrogen-fixation activity. The model legume Medicago truncatula forms nodules with several species of the Sinorhizobium genus. However, the efficiency of these bacterial strains is highly variable...
April 24, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28437137/differential-requirement-of-the-ribosomal-protein-s6-and-ribosomal-protein-s6-kinase-for-plant-virus-accumulation-and-interaction-of-s6-kinase-with-potyviral-vpg
#3
Minna-Liisa Rajamäki, Dehui Xi, Sidona Sikorskaite-Gudziuniene, Jari P T Valkonen, Steven A Whitham
Ribosomal protein S6 (RPS6) is an indispensable plant protein regulated, in part, by ribosomal protein S6 kinase (S6K) which, in turn, is a key regulator of plant responses to stresses and developmental cues. Increased expression of RPS6 was detected in Nicotiana benthamiana during infection by diverse plant viruses. Silencing of the RPS6 and S6K genes in N. benthamiana affected accumulation of Cucumber mosaic virus, Turnip mosaic virus (TuMV), and Potato virus A (PVA) in contrast to Turnip crinkle virus and Tobacco mosaic virus...
April 24, 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
#4
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...
April 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28430017/two-nramp6-isoforms-function-as-iron-and-manganese-transporters-and-contribute-to-disease-resistance-in-rice
#5
Cristina Peris-Peris, Albert Serra-Cardona, Ferrán Sánchez-Sanuy, Sonia Campo, Joaquin Ariño, Blanca San Segundo
Metal ions are essential elements for all living organisms. However, metals can be toxic when present in excess. In plants, metal homeostasis is partly achieved through the function of metal transporters, including the diverse natural resistance-associated macrophage proteins (NRAMP). Among them, the OsNramp6 gene encodes a previously uncharacterized member of the rice NRAMP family that undergoes alternative splicing to produce different NRAMP6 proteins. In this work, we determined the metal transport activity and biological role of the full-length and the shortest NRAMP6 proteins (l-NRAMP6 and s-NRAMP6, respectively)...
April 21, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28425831/investigating-the-phylogenetic-range-of-gibberellin-biosynthesis-in-bacteria
#6
Raimund Nagel, Reuben J Peters
Certain plant-associated microbes can produce gibberellin (GA) phytohormones, as first described for the rice fungal pathogen Gibberella fujikuroi and, more recently, for bacteria, including several rhizobia and the rice bacterial pathogen Xanthomonas oryzae pv. oryzicola. The relevant enzymes are encoded by a biosynthetic operon that exhibits both a greater phylogenetic range and scattered distribution among plant-associated bacteria. Here, the phylogenetic distribution of this operon was investigated. To demonstrate conserved functionality, the enzymes encoded by the disparate operon from X...
April 20, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28291380/beneficial-rhizobacterium-bacillus-amyloliquefaciens-sqr9-induces-plant-salt-tolerance-through-spermidine-production
#7
Lin Chen, Yunpeng Liu, Gengwei Wu, Nan Zhang, Qirong Shen, Ruifu Zhang
The inoculation of plants with plant-growth-promoting rhizobacterium has been an effective strategy for enhancing plant salt tolerance to diminish the loss of agricultural productivity caused by salt stress; however, 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...
April 20, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28421861/the-plant-dependent-life-cycle-of-thecaphora-thlaspeos-a-smut-fungus-adapted-to-brassicaceae
#8
Lamprinos Frantzeskakis, Kaitlyn J Courville, Lesley Plücker, Ronny Kellner, Julia Kruse, Andreas Brachmann, Michael Feldbrügge, Vera Göhre
Smut fungi are globally distributed plant pathogens that infect agriculturally important crop plants such as maize or potato. To date, molecular studies on plant responses to smut fungi are challenging due to the genetic complexity of their host plants. Therefore, we set out to investigate the known smut fungus of Brassicaceae hosts, Thecaphora thlaspeos. T. thlaspeos infects different Brassicaceae plant species throughout Europe, including the perennial model plant Arabis alpina. In contrast to characterized smut fungi, mature and dry T...
April 19, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28409535/sumoylation-e3-ligase-siz1-modulates-plant-immunity-partly-through-the-immune-receptor-gene-snc1-in-arabidopsis
#9
Mingyue Gou, Quansheng Huang, Weiqiang Qian, Zemin Zhang, Zhenhua Jia, Jian Hua
The small ubiqutin-like modifier E3 ligase SIZ1 regulates multiple processes in Arabidopsis, including salicylic-acid-dependent immune responses. However, the targets of SIZ1 in plant immunity are not known. Here, we provide evidence that the plant immune receptor nucleotide-binding leucine-rich repeat gene SNC1 partially mediates the regulation of plant immunity by SIZ1. The siz1 loss-of-function mutant has an autoimmune phenotype that is dependent on SNC1 and temperature. Overexpression of SIZ1 partially rescues autoimmune mutant phenotypes induced by activation or overaccumulation of SNC1, and the SNC1 protein amount is attenuated by SIZ1 overexpression...
April 14, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28402184/root-knot-nematode-parasitism-suppresses-host-rna-silencing
#10
E Walsh, J M Elmore, C G Taylor
Root-knot nematodes damage crops around the world by developing complex feeding sites from normal root cells of their hosts. The ability to initiate and maintain this feeding site (composed of individual "giant cells") is essential to their parasitism process. RNA silencing pathways in plants serve a diverse set of functions, from directing growth and development to defending against invading pathogens. Influencing a host's RNA silencing pathways as a pathogenicity strategy has been well-documented for viral plant pathogens, but recently, it has become clear that silencing pathways also play an important role in other plant pathosystems...
April 12, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28398840/the-ntry-ntrx-system-of-sinorhizobium-meliloti-gr4-regulates-motility-eps-i-production-and-nitrogen-metabolism-but-is-dispensable-for-symbiotic-nitrogen-fixation
#11
Nieves Calatrava-Morales, Joaquina Nogales, Kinia Ameztoy, Bart van Steenbergen, María José Soto
Sinorhizobium meliloti can translocate over surfaces. However, little is known about the regulatory mechanisms that control this trait and its relevance for establishing symbiosis with alfalfa plants. To gain insights into this field, we isolated Tn5 mutants of S. meliloti GR4 with impaired surface motility. In mutant strain GRS577, the transposon interrupted the ntrY gene encoding the sensor kinase of the NtrY/NtrX two-component regulatory system. GRS577 is impaired in flagella synthesis, and overproduces succinoglycan which is responsible for increased biofilm formation...
April 11, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28398839/foundational-and-translational-research-opportunities-to-improve-plant-health
#12
Richard W Michelmore, Gitta Coaker, Rebecca Bart, Gwyn A Beattie, Andrew Bent, Toby Bruce, Duncan Cameron, Jeff Dangl, Savithramma Dinesh-Kumar, Robert Edwards, Sebastian Eves-van den Akker, Walter Gassmann, Jean Greenberg, Richard Harrison, Ping He, Jagger Harvey, Alisa Huffaker, Scot Hulbert, Roger Innes, Jonathan D Jones, Isgouhi Kaloshian, Sophien Kamoun, Fumiaki Katagiri, Jan E Leach, Wenbo Ma, John M McDowell, June Medford, Blake Meyers, Rebecca Nelson, Richard Peter Oliver, Yiping Qi, Diane Saunders, Michael Shaw, Prasanta Subudhi, Leslie Torrance, Brett M Tyler, John Walsh
This whitepaper reports the deliberations of a workshop focused on biotic challenges to plant health held in Washington, D.C. in September 2016. Ensuring health of food plants is critical to maintaining the quality and productivity of crops and for sustenance of the rapidly growing human population. There is a close linkage between food security and societal stability; however, global food security is threatened by the vulnerability of our agricultural systems to numerous pests, pathogens, weeds, and environmental stresses...
April 11, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28398838/a-role-of-cytokinin-transporter-in-arabidopsis-immunity
#13
Shuai Wang, Shu Wang, Qi Sun, Leiyun Yang, Ying Zhu, Yaping Yuan, Jian Hua
The phytohormone cytokinin (CK) is not only essential for plant growth and development but also impacts plant immunity. A mutant screen in a constitutively active plant immune receptor mutant snc1 (suppressor of npr1, constitutive1) identified a suppressor mutation of SNC1-induced defense responses in an ABC transporter coding gene ABCG14. ABCG14 transports CK from roots to the shoots, and the suppression of the SNC1-mediated defense response by the loss of ABCG14 is due to a deficiency of trans-zeatin (tZ)-type CK in the shoot...
April 11, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28398123/heterologous-complementation-reveals-a-specialized-activity-for-baca-in-the-medicago-sinorhizobium-meliloti-symbiosis
#14
George C diCenzo, Maryam Zamani, Hannah N Ludwig, Turlough M Finan
The bacterium Sinorhizobium meliloti Rm2011 forms N2-fixing root nodules on alfalfa and other leguminous plants. The pSymB chromid contains a 110-kb region (the ETR region) showing high synteny to a chromosomally located region in Sinorhizobium fredii NGR234 and related rhizobia. We recently introduced the ETR region from S. fredii NGR234 into the S. meliloti chromosome. Here, we report that, unexpectedly, the S. fredii NGR234 ETR region did not complement deletion of the S. meliloti ETR region in symbiosis with Medicago sativa...
April 10, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28398122/investigating-proteome-and-transcriptome-defense-response-of-apples-induced-by-yarrowia-lipolytica
#15
Hongyin Zhang, Liangliang Chen, Yiwen Sun, Lina Zhao, Xiangfeng Zheng, Qiya Yang, Xiaoyun Zhang
A better understanding of the mode of action of postharvest biocontrol agents on fruit surfaces is critical for the advancement of successful implementation of postharvest biocontrol products. This is due to the increasing importance of biological control of postharvest diseases over chemical and other control methods. However, most of the mechanisms involved in biological control remain unknown and need to be explored. Yarrowia lipolytica significantly inhibited blue mold decay of apples caused by Penicillium expansum...
April 10, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28384054/virulence-of-pseudomonas-syringae-pv-tomato-dc3000-is-influenced-by-the-catabolite-repression-control-protein-crc
#16
Suma Chakravarthy, Bronwyn G Butcher, Yingyu Liu, Katherine D'Amico, Matthew Coster, Melanie J Filiatrault
Pseudomonas syringae infects diverse plant species and is widely used as a model system in the study of effector function and the molecular basis of plant diseases. Although the relationship between bacterial metabolism, nutrient acquisition, and virulence has attracted increasing attention in bacterial pathology, it is largely unexplored in P. syringae. The Crc (catabolite repression control) protein is a putative RNA-binding protein that regulates carbon metabolism as well as a number of other factors in the pseudomonads...
April 6, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28358623/one-target-two-mechanisms-the-impact-of-candidatus-liberibacter-asiaticus-and-its-vector-diaphorina-citri-on-citrus-leaf-pigments
#17
Nabil Killiny, Yasser Nehela
Huanglongbing is currently the largest threat to global citrus production. We examined the effect of HLB pathogen, Candidatus Liberibacter asiaticus-infection and/or its vector, Diaphorina citri-infestation on Valencia sweet orange leaf pigments using HPLC, followed by gene expression analysis for 46 involved genes in carotenoids- and chlorophylls-biosynthesis pathways. Both CLas and D. citri alter the total citrus leaf pigments balance with a greater impact by CLas. While zeaxanthin was accumulated in CLas-infected leaves, chlorophyllide a was increased in D...
March 30, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28358622/cytological-and-molecular-characterization-of-zmwak-mediated-head-smut-resistance-in-maize
#18
Nan Zhang, Boqi Zhang, Weiliang Zuo, Yuexian Xing, Suvimon Konlasuk, Guoqing Tan, Qianqian Zhang, Jianrong Ye, Mingliang Xu
Head smut, caused by the fungal pathogen Sporisorium reilianum, poses a threat to maize production worldwide. ZmWAK, a cell wall-associated receptor kinase, confers quantitative resistance to head-smut disease. Here, two near-isogenic lines, susceptible line Huangzao4 and its ZmWAK-converted resistant line Huangzao4R were used to decipher the role of ZmWAK in head smut resistance. Cytological and molecular characterization in response to S. reilianum infection was compared between 2 NILs. Upon S. reilianum infection, the growth of pathogen hyphae was severely arrested in the ZmWAK-converted resistant line Huangzao4R relative to its susceptible parental line Huangzao4...
March 30, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28095124/mlo-based-resistance-an-apparently-universal-weapon-to-defeat-powdery-mildew-disease
#19
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
#20
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
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