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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/28634483/elicitor-induced-biochemical-and-molecular-manifestations-to-improve-drought-tolerance-in-rice-oryza-sativa-l-through-seed-priming
#2
Mahesh K Samota, Minnu Sasi, Monika Awana, Om P Yadav, S V Amitha Mithra, Aruna Tyagi, Suresh Kumar, Archana Singh
Rice (Oryza sativa L.) is one of the major grain cereals of the Indian subcontinent which face water-deficit stress for their cultivation. Seed-priming has been reported to be a useful approach to complement stress responses in plants. In the present study, seed-priming with hormonal or chemical elicitor [viz. methyl jasmonate (MJ), salicylic acid (SA), paclobutrazol (PB)] showed significant increase in total phenolic content, antioxidant activity and expression of Rice Drought-responsive (RD1 and RD2) genes (of AP2/ERF family) in contrasting rice genotypes (Nagina-22, drought-tolerant and Pusa Sugandh-5, drought-sensitive) under drought stress...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28633463/the-body-odor-disgust-scale-bods-development-and-validation-of-a-novel-olfactory-disgust-assessment
#3
Marco Tullio Liuzza, Torun Lindholm, Caitlin Hawley, Marie Gustafsson Sendén, Ingrid Ekström, Mats J Olsson, Maria Larsson, Jonas K Olofsson
Disgust plays a crucial role in the avoidance of pathogen threats. In many species, body odors provide important information related to health and disease, and body odors are potent elicitors of disgust in humans. With this background, valid assessments of body odor disgust sensitivity are warranted. In the present article, we report the development and psychometric validation of the Body Odor Disgust Scale (BODS), a measure suited to assess individual differences in disgust reaction to a variety of body odors...
July 1, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28629201/systemic-induction-of-the-defensin-and-phytoalexin-pisatin-pathways-in-pea-pisum-sativum-against-aphanomyces-euteiches-by-acetylated-and-nonacetylated-oligogalacturonides
#4
Sameh Selim, Jean Sanssené, Stéphanie Rossard, Josiane Courtois
Oligogalacturonides (OGs) are known for their powerful ability to stimulate the plant immune system but little is known about their mode of action in pea (Pisum sativum). In the present study, we investigated the elicitor activity of two fractions of OGs, with polymerization degrees (DPs) of 2-25, in pea against Aphanomyces euteiches. One fraction was nonacetylated (OGs - Ac) whereas the second one was 30% acetylated (OGs + Ac). OGs were applied by injecting the upper two rachises of the plants at three- and/or four-weeks-old...
June 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28620396/identification-of-a-potential-isr-determinant-from-pseudomonas-aeruginosa-pm12-against-fusarium-wilt-in-tomato
#5
Sabin Fatima, Tehmina Anjum
Biocontrol of plant diseases through induction of systemic resistance is an environmental friendly substitute to chemicals in crop protection measures. Different biotic and abiotic elicitors can trigger the plant for induced resistance. Present study was designed to explore the potential of Pseudomonas aeruginosa PM12 in inducing systemic resistance in tomato against Fusarium wilt. Initially the bioactive compound, responsible for ISR, was separated and identified from extracellular filtrate of P. aeruginosa PM12...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28618009/evidence-of-an-evolutionary-hourglass-pattern-in-herbivory-induced-transcriptomic-responses
#6
Matthew Durrant, Justin Boyer, Wenwu Zhou, Ian T Baldwin, Shuqing Xu
Herbivory-induced defenses are specific and activated in plants when elicitors, frequently found in the herbivores' oral secretions, are introduced into wounds during attack. While complex signaling cascades are known to be involved, it remains largely unclear how natural selection has shaped the evolution of these induced defenses. We analyzed herbivory-induced transcriptomic responses in wild tobacco, Nicotiana attenuata, using a phylotranscriptomic approach that measures the origin and sequence divergence of herbivory-induced genes...
June 15, 2017: New Phytologist
https://www.readbyqxmd.com/read/28613869/effect-of-different-elicitors-and-pre-harvest-day-application-on-the-content-of-phytochemicals-and-antioxidant-activity-of-butterhead-lettuce-lactuca-sativa-var-capitata-produced-under-hydroponic-conditions
#7
Jesus Omar Moreno-Escamilla, Emilio Alvarez-Parrilla, Laura A de la Rosa, José Alberto Núñez-Gastélum, Gustavo A González-Aguilar, Joaquin Rodrigo-Garcia
The effect of four elicitors on phytochemical content in two varieties of lettuce was evaluated. The best pre-harvest day for application of each elicitor was chosen. Solutions of arachidonic acid (AA), salicylic acid (SA), methyl jasmonate (MJ), and Harpin protein (HP) were applied by foliar aspersion on lettuce leaves while cultivated under hydroponic conditions. Application of elicitors was done at 15, 7, 5, 3 or 1 day before harvest. Green lettuce showed the highest increase in phytochemical content when elicitors (AA, SA, and HP) were applied on day 7 before harvest...
June 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28611802/involvement-of-trichoderma-harzianum-epl-1-protein-in-the-regulation-of-botrytis-virulence-and-tomato-defense-related-genes
#8
Eriston V Gomes, Cirano J Ulhoa, Rosa E Cardoza, Roberto N Silva, Santiago Gutiérrez
Several Trichoderma spp. are well known for their ability to: (i) act as important biocontrol agents against phytopathogenic fungi; (ii) function as biofertilizers; (iii) increase the tolerance of plants to biotic and abiotic stresses; and (iv) induce plant defense responses via the production and secretion of elicitor molecules. In this study, we analyzed the gene-regulation effects of Trichoderma harzianum Epl-1 protein during the interactions of mutant Δepl-1 or wild-type T. harzianum strains with: (a) the phytopathogen Botrytis cinerea and (b) with tomato plants, on short (24 h hydroponic cultures) and long periods (4-weeks old plants) after Trichoderma inoculation...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28610730/elicitors-used-as-a-tool-to-increase-stilbenes-in-grapes-and-wines
#9
Rocío Gil-Muñoz, José Ignacio Fernández-Fernández, Oscar Crespo-Villegas, Teresa Garde-Cerdán
Two preharvest treatments (methyl jasmonate or cell wall yeast) of grapevines (Monastrell and Tempranillo) were applied during two vintages (2014 and 2015) to check whether these elicitors enhanced stilbene accumulation in berries at the moment of harvest and in the corresponding wines elaborated with them. The main objective was checking the effect of treatment, variety and year on stilbene composition due to the interesting health-related properties of these compounds in both grapes and wines. The results pointed to inter-varietal and inter-annual differences, and that the treatments generally enhanced the stilbene composition of grapes and, particularly, of wines...
August 2017: Food Research International
https://www.readbyqxmd.com/read/28606662/comparison-of-cerato-platanin-family-protein-bcspl1-produced-in-pichia-pastoris-and-escherichia-coli
#10
Yi Zhang, Yingbo Liang, Dewen Qiu, Jingjing Yuan, Xiufen Yang
The Botrytis cinerea BcSpl1 protein is a member of the cerato-platanin family, and consists of 137 amino acids and two disulfide bridges. This protein induces the onset of necrosis in infiltrated plant hosts. Recombinant BcSpl1 proteins produced in Pichia pastoris (pBcSpl1) and Escherichia coli (eBcSpl1) were initially compared regarding their abilities to induce necrosis and systemic acquired resistance (SAR). The pBcSpl1 and eBcSpl1 treatments led to the development of necrotic lesions on tomato leaves, and provided tomato plants with SAR to B...
June 9, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28600875/plant-elicitor-peptides-promote-plant-defenses-against-nematodes-in-soybean
#11
Min Woo Lee, Alisa Huffaker, Devany Crippen, Robert T Robbins, Fiona Goggin
Plant elicitor peptides (Peps) are widely distributed among angiosperms, and have been shown to amplify immune responses in multiple plant families. Here we characterize three Peps from soybean (Glycine max) and describe their effects on plant defenses against two damaging agricultural pests, the root-knot nematode (Meloidogyne incognita) and the soybean cyst nematode (Heterodera glycines). Seed treatments with exogenous GmPep1, GmPep2, or GmPep3 significantly reduced the reproduction of both nematodes. Pep treatment also protected plants from the inhibitory effects of root-knot nematodes on aboveground growth, and upregulated basal expression levels of nematode-responsive defense genes...
June 10, 2017: Molecular Plant Pathology
https://www.readbyqxmd.com/read/28600687/carnivore-attractant-or-plant-elicitor-multifunctional-roles-of-methyl-salicylate-lures-in-tomato-defense
#12
Elizabeth Rowen, Michael Gutensohn, Natalia Dudareva, Ian Kaplan
Synthetic plant volatile lures attract natural enemies, but may have non-target effects due to the multifunctional nature of volatile signals. For example, methyl salicylate (MeSA) is used to attract predators, yet also serves as a signaling hormone involved in plant pathogen defense. We investigated the consequences of deploying MeSA lures to attract predators for tomato (Solanum lycopersicum) defense against herbivores. To understand the spatial distribution of the lure's effect, we exposed tomatoes in the field to MeSA along a linear distance gradient and induced defenses by simulating feeding by hornworm caterpillars in a fully crossed factorial design (+/- MeSA, +/- herbivory)...
June 9, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28600557/regulatory-functions-of-cellular-energy-sensor-snf1-related-kinase1-for-leaf-senescence-delay-through-ethylene-insensitive3-repression
#13
Geun-Don Kim, Young-Hee Cho, Sang-Dong Yoo
Aging of living organisms is governed by intrinsic developmental programs, of which progression is often under the regulation of their cellular energy status. For example, calorie restriction is known to slow down aging of heterotrophic organisms from yeasts to mammals. In autotrophic plants cellular energy deprivation by perturbation of photosynthesis or sugar metabolism is also shown to induce senescence delay. However, the underlying molecular and biochemical mechanisms remain elusive. Our plant cell-based functional and biochemical assays have demonstrated that SNF1-RELATED KINASE1 (SnRK1) directly interacts, phosphorylates, and destabilizes the key transcription factor ETHYLENE INSENSITIVE3 (EIN3) in senescence-promoting hormone ethylene signaling...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28595359/intracellular-ca2-is-important-for-flagellin-triggered-defense-in-arabidopsis-and-involves-inositol-polyphosphate-signaling
#14
Yi Ma, Yichen Zhao, Gerald A Berkowitz
Cytosolic Ca2+ increase is a crucial and early step of plant immunity evoked by pathogen-associated molecular patterns (PAMPs) such as flagellin (flg). Components responsible for this increase are still not uncovered, although current models of plant immune signaling portray extracellular Ca2+ influx as paramount to flg activation of defense pathways. Work presented here provides new insights into cytosolic Ca2+ increase associated with flg-induced defense responses. We show that extracellular Ca2+ contributes more to immune responses evoked by plant elicitor peptide (Pep3) than that evoked by flg, indicating an intracellular Ca2+ source responsible for immune responses evoked by flg...
June 8, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28590725/discovery-of-a-cryptic-antifungal-compound-from-streptomyces-albus-j1074-using-high-throughput-elicitor-screens
#15
Fei Xu, Behnam Nazari, Kyuho Moon, Leah B Bushin, Mohammad R Seyedsayamdost
An important unresolved issue in microbial secondary metabolite production is the abundance of biosynthetic gene clusters that are not expressed under typical laboratory growth conditions. These so-called silent or cryptic gene clusters are sources of new natural products, but how they are silenced, and how they may be rationally activated are areas of ongoing investigation. We recently devised a chemogenetic high-throughput screening approach ('HiTES') to discover small molecule elicitors of silent biosynthetic gene clusters...
June 7, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28587993/superoxide-responsive-gene-expression-in-arabidopsis-thaliana-and-zea-mays
#16
Junhuan Xu, Thu Tran, Carmen S Padilla Marcia, David M Braun, Fiona L Goggin
Superoxide (O2(-)) and other reactive oxygen species (ROS) are generated in response to numerous biotic and abiotic stresses. Different ROS have been reported to elicit different transcriptional responses in plants, and so ROS-responsive marker genes and promoter::reporter gene fusions have been proposed as indirect means of detecting ROS and discriminating among different species. However, further information about the specificity of transcriptional responses to O2(-) is needed in order to assess potential markers for this critical stress-responsive signaling molecule...
May 29, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28586470/the-ida-like-peptides-idl6-and-idl7-are-negative-modulators-of-stress-responses-in-arabidopsis-thaliana
#17
Ane Kjersti Vie, Javad Najafi, Per Winge, Ester Cattan, Michael Wrzaczek, Jaakko Kangasjärvi, Gad Miller, Tore Brembu, Atle M Bones
Small signalling peptides have emerged as important cell to cell messengers in plant development and stress responses. However, only a few of the predicted peptides have been functionally characterized. Here, we present functional characterization of two members of the IDA-LIKE (IDL) peptide family in Arabidopsis thaliana, IDL6 and IDL7. Localization studies suggest that the peptides require a signal peptide and C-terminal processing to be correctly transported out of the cell. Both IDL6 and IDL7 appear to be unstable transcripts under post-transcriptional regulation...
June 6, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28585465/chitosan-signaling-in-guard-cells-requires-endogenous-salicylic-acid
#18
Md Yeasin Prodhan, Mohammad Issak, Toshiyuki Nakamura, Shintaro Munemasa, Yoshimasa Nakamura, Yoshiyuki Murata
An elicitor chitosan (CHT) induces stomatal closure but the mechanism remains to be clarified. A phytohormone salicylic acid (SA) is crucial for elicitor-induced defense signaling in plants. Here we investigated whether endogenous SA is required for CHT signaling in guard cells. In the SA-deficient nahG mutant, treatment of CHT did not induce either apoplastic reactive oxygen species (ROS) production or stomatal closure but co-treatment of CHT and SA induced both apoplastic ROS production and stomatal closure, indicating the involvement of endogenous SA in CHT-induced apoplastic ROS production and CHT-induced stomatal closure...
June 6, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28583948/lysinibacillus-fusiformis-m5-induces-increased-complexity-in-bacillus-subtilis-168-colony-biofilms-via-hypoxanthine
#19
Ramses Gallegos-Monterrosa, Stefanie Kankel, Sebastian Götze, Robert Barnett, Pierre Stallforth, Ákos T Kovács
In recent years, biofilms have become a central subject of research in the fields of microbiology, medicine, agriculture, or systems biology amongst others. The sociomicrobiology of multispecies biofilms, however, is still poorly understood. Here, we report a screening system that allowed us to identify soil bacteria, which induce architectural changes in biofilm colonies when cocultured with B. subtilis We identified the soil bacterium Lysinibacillus fusiformis M5 as inducer of wrinkle-formation in B. subtilis colonies mediated by a diffusible signaling molecule...
June 5, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28582732/the-dynamics-and-endocytosis-of-flot1-protein-in-response-to-flg22-in-arabidopsis
#20
Meng Yu, Haijiao Liu, Ziyi Dong, Jianwei Xiao, Bodan Su, Lusheng Fan, George Komis, Jozef Šamaj, Jinxing Lin, Ruili Li
Membrane microdomains play vital roles in the process of bacterial infection. The membrane microdomain-associated protein Flot1 acts in an endocytic pathway and is required for seedling development, however, whether Flot1 is a part of host defense mechanisms remains unknown. During an analysis of callose deposition, we found that Flot1 amiRNAi mutants exhibited defects in response to flg22. Using variable-angle total internal reflection fluorescence microscopy (VA-TIRFM), structured illumination microscopy (SIM) and fluorescence cross spectroscopy (FCS), we determined that the dynamic behavior of GFP-Flot1 in Arabidopsis thaliana cotyledon epidermal cells changed significantly in plants treated with the elicitor flg22...
May 19, 2017: Journal of Plant Physiology
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