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https://www.readbyqxmd.com/read/28803980/humoral-immune-response-of-galleria-mellonella-after-repeated-infection-with-bacillus-thuringiensis
#1
Paulina Taszłow, Lidiia Vertyporokh, Iwona Wojda
The insect immune system relies on innate mechanisms only. However, there is an increasing number of data reporting that previous immune challenge with microbial elicitors or a low number of microorganisms can modulate susceptibility after subsequent lethal infection with the same or different pathogen. This phenomenon is called immune priming. Its biochemical and molecular mechanisms remain unravelled. Here we present that Galleria mellonella larvae that survived infection induced by intrahemocelic injection of a low dose of Bacillus thuringiensis were more resistant to re-injection of a lethal dose of the same bacteria but not with other bacteria and fungi tested...
August 10, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28802186/a-l-type-lectin-gene-is-involved-in-the-response-to-hormonal-treatment-and-water-deficit-in-volkamer-lemon
#2
Dayse Drielly Sousa Santana Vieira, Giovanni Emiliani, Paola Bartolini, Alessandra Podda, Mauro Centritto, François Luro, Renata Del Carratore, Raphaël Morillon, Abelmon Gesteira, Biancaelena Maserti
Combination of biotic and abiotic stress is a major challenge for crop and fruit production. Thus, identification of genes involved in cross-response to abiotic and biotic stress is of great importance for breeding superior genotypes. Lectins are glycan-binding proteins with a functions in the developmental processes as well as in the response to biotic and abiotic stress. In this work, a lectin like gene, namely ClLectin1, was characterized in Volkamer lemon and its expression was studied in plants exposed to either water stress, hormonal elicitors (JA, SA, ABA) or wounding to understand whether this gene may have a function in the response to multiple stress combination...
August 1, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28801742/the-cyclic-lipopeptide-orfamide-induces-systemic-resistance-in-rice-to-cochliobolus-miyabeanus-but-not-to-magnaporthe-oryzae
#3
Zongwang Ma, Marc Ongena, Monica Höfte
The Pseudomonas- derived cyclic lipopeptide orfamide can induce resistance to Cochliobolus miyabeanus but not to Magnaporthe oryzae in rice. Abscisic acid signaling is involved in the induced systemic resistance response triggered by orfamide. Diverse natural products produced by beneficial Pseudomonas species have the potential to trigger induced systemic resistance (ISR) in plants, and thus may contribute to control of diseases in crops. Some beneficial Pseudomonas spp. can produce cyclic lipopeptides (CLPs), amphiphilic molecules composed of a fatty acid tail linked to an oligopeptide which is cyclized...
August 11, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28796123/hymenoptera-induced-anaphylaxis-is-it-a-mast-cell-driven-hematological-disorder
#4
Knut Brockow, Cem Akin
PURPOSE OF REVIEW: Hymenoptera-induced allergy (HVA) is a common cause of anaphylaxis and may be fatal. It is associated with systemic mastocytosis in about 7% of adult patients. Systemic mastocytosis is a proliferative disorder of hematopoietic mast cell progenitors. There is recent data on the association between systemic mastocytosis and HVA. RECENT FINDINGS: Hymenoptera venoms are the most common immunoglobulin E-mediated elicitors of anaphylaxis in patients with mastocytosis...
August 8, 2017: Current Opinion in Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28793366/cadmium-induced-melatonin-synthesis-in-rice-requires-light-hydrogen-peroxide-and-nitric-oxide-key-regulatory-roles-for-tryptophan-decarboxylase-and-caffeic-acid-o-methyltransferase
#5
Kyungjin Lee, Geun-Hee Choi, Kyoungwhan Back
In plants, melatonin production is induced by stimuli such as cold and drought, and cadmium (Cd) is the best elicitor of melatonin production in rice. However, the mechanism by which Cd induces melatonin synthesis in plants remains unknown. We challenged rice seedlings with Cd under different light conditions and found that continuous light produced the highest levels of melatonin, while continuous dark failed to induce melatonin production. Transcriptional and translational induction of tryptophan decarboxylase contributed to the light induction of melatonin during Cd treatment, whereas the protein level of light-induced caffeic acid O-methyltransferase (COMT) was decreased by Cd treatment...
August 9, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/28782279/biosynthesis-of-the-antimicrobial-cyclic-lipopeptides-nunamycin-and-nunapeptin-by-pseudomonas-fluorescens-strain-in5-is-regulated-by-the-luxr-type-transcriptional-regulator-nunf
#6
Rosanna C Hennessy, Christopher B W Phippen, Kristian F Nielsen, Stefan Olsson, Peter Stougaard
Nunamycin and nunapeptin are two antimicrobial cyclic lipopeptides (CLPs) produced by Pseudomonas fluorescens In5 and synthesized by nonribosomal synthetases (NRPS) located on two gene clusters designated the nun-nup regulon. Organization of the regulon is similar to clusters found in other CLP-producing pseudomonads except for the border regions where putative LuxR-type regulators are located. This study focuses on understanding the regulatory role of the LuxR-type-encoding gene nunF in CLP production of P...
August 6, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28767129/the-role-of-euglena-gracilis-paramylon-in-modulating-xylem-hormone-levels-photosynthesis-and-water-use-efficiency-in-solanum-lycopersicum-l
#7
Andrea Scartazza, Piero Picciarelli, Lorenzo Mariotti, Maurizio Curadi, Laura Barsanti, Paolo Gualtieri
β-1,3-glucans such as paramylon act as elicitors in plants, modifying the hormonal levels and the physiological responses. Plant hormones affect all phases of the plant life cycle and their responses to environmental stresses, both biotic and abiotic. The aim of this study was to investigate the effects of a root treatment with Euglena gracilis paramylon on xylem hormonal levels, photosynthetic performance and dehydration stress in tomato (Solanum lycopersicum L.). Paramylon granules were processed to obtain the linear fibrous structures capable to interact with tomato cell membrane...
August 2, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28762578/identification-and-functionality-prediction-of-pathogenesis-related-protein-1-from-legume-family
#8
Meenakshi Tellis, Monika Mathur, Gayatri Gurjar, Narendra Kadoo, Vidya Gupta
The production and accumulation of pathogenesis related (PR) proteins in plants is one of the important responses to biotic and abiotic stress. Large number of identified PR proteins has been categorized into 17 functional families based on their structure, phylogenetics and biological activities. However, they are not widely studied in legume crops. Using 29 PR1 proteins from Arabidopsis thaliana, as query, here we have predicted 92 candidate PR1 proteins through the PSI-BLAST and HMMER programs. These candidate proteins were comprehensively analysed with, multiple sequence alignment, domain architecture studies, signal peptide and motif extraction followed by phylogenetic analysis...
August 1, 2017: Proteins
https://www.readbyqxmd.com/read/28762076/the-accumulation-of-%C3%AE-aminobutyric-acid-is-controlled-by-the-plant-s-immune-system
#9
Ivan Baccelli, Gaétan Glauser, Brigitte Mauch-Mani
Endogenous levels of β-aminobutyric acid (BABA) increase after the molecular recognition of pathogen presence. BABA is accumulated differently during resistance or susceptibility to disease. The priming molecule β-aminobutyric acid has been recently shown to be a natural product of plants, and this has provided significance to the previous discovery of a perception mechanism in Arabidopsis. BABA levels were found to increase after abiotic stress or infection with virulent pathogens, but the role of endogenous BABA in defence has remained to be established...
August 1, 2017: Planta
https://www.readbyqxmd.com/read/28758965/identification-and-quantification-of-celery-allergens-using-fiber-optic-surface-plasmon-resonance-pcr
#10
Devin Daems, Bernd Peeters, Filip Delport, Tony Remans, Jeroen Lammertyn, Dragana Spasic
Abstract: Accurate identification and quantification of allergens is key in healthcare, biotechnology and food quality and safety. Celery (Apium graveolens) is one of the most important elicitors of food allergic reactions in Europe. Currently, the golden standards to identify, quantify and discriminate celery in a biological sample are immunoassays and two-step molecular detection assays in which quantitative PCR (qPCR) is followed by a high-resolution melting analysis (HRM). In order to provide a DNA-based, rapid and simple detection method suitable for one-step quantification, a fiber optic PCR melting assay (FO-PCR-MA) was developed to determine different concentrations of celery DNA (1 pM-0...
July 31, 2017: Sensors
https://www.readbyqxmd.com/read/28755262/physicochemical-and-microbial-responses-of-streptomyces-natalensis-hw-2-to-fungal-elicitor
#11
Dahong Wang, Lanlan Wei, Ying Zhang, Mengjuan Zhang, Shaobin Gu
The effects of fungal elicitor on the physicochemical and microbial responses of Streptomyces natalensis HW-2 were investigated. The results showed that the elicitor could decrease dry cell weight (DCW) by 17.7% and increase the utilization of glucose, while the curve of pH was not obviously altered. The elicitor enhanced the yield of natamycin from 1.33 to 2.49 g/L. The morphology of the colony and the mycelium treated with elicitor showed significant differences from that of control. The level of intracellular reactive oxygen species (ROS) increased to 333...
July 28, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28749423/distinct-mechanisms-of-biotic-and-chemical-elicitors-enable-additive-elicitation-of-the-anticancer-phytoalexin-glyceollin-i
#12
Kelli Farrell, Md Asraful Jahan, Nik Kovinich
Phytoalexins are metabolites biosynthesized in plants in response to pathogen, environmental, and chemical stresses that often have potent bioactivities, rendering them promising for use as therapeutics or scaffolds for pharmaceutical development. Glyceollin I is an isoflavonoid phytoalexin from soybean that exhibits potent anticancer activities and is not economical to synthesize. Here, we tested a range of source tissues from soybean, in addition to chemical and biotic elicitors, to understand how to enhance the bioproduction of glyceollin I...
July 27, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28725232/transcriptome-wide-identification-of-differentially-expressed-genes-in-solanum-lycopersicon-l-in-response-to-an-alfalfa-protein-hydrolysate-using-microarrays
#13
Andrea Ertani, Michela Schiavon, Serenella Nardi
An alfalfa-based protein hydrolysate (EM) has been tested in tomato (Solanum lycopersicon L.) plants at two different concentrations (0.1 and 1 mL L(-1)) to get insight on its efficacy as biostimulant in this species and to unravel possible metabolic targets and molecular mechanisms that may shed light on its mode of action. EM was efficient in promoting the fresh biomass and content in chlorophyll and soluble sugars of tomato plants, especially when it was applied at the concentration of 1 mL L(-1). This effect on plant productivity was likely related to the EM-dependent up-regulation of genes identified via microarray and involved in primary carbon and nitrogen metabolism, photosynthesis, nutrient uptake and developmental processes...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28705396/host-extracts-induce-changes-in-the-proteome-of-plant-pathogen-fusarium-proliferatum
#14
Karolina Górna, Dawid Perlikowski, Arkadiusz Kosmala, Łukasz Stępień
Fusarium proliferatum is a polyphagous pathogenic fungus able to infect many crop plants worldwide. Differences in proteins accumulated were observed when maize- and asparagus-derived F. proliferatum strains were exposed to host extracts prepared from asparagus, maize, garlic, and pineapple tissues. Seventy-three unique proteins were up-regulated in extract-supplemented cultures compared to the controls. They were all identified using mass spectrometry and their putative functions were assigned. A major part of identified proteins was involved in sugar metabolism and basic metabolic processes...
August 2017: Fungal Biology
https://www.readbyqxmd.com/read/28703611/smartphone-based-momentary-intervention-for-alcohol-cravings-amongst-individuals-with-an-alcohol-use-disorder
#15
Patrick L Dulin, Vivian M Gonzalez
Smartphone-based alcohol interventions represent an innovative strategy for providing in-the-moment intervention to individuals with an alcohol use disorder. While early research into their overall effectiveness is promising, little is known about the efficacy of specific intervention tools in reducing drinking subsequent to a cued craving. This study examined the influence of smartphone-delivered in-the-moment coping strategies on drinking after experiencing a craving among participants utilizing the Location-Based Monitoring and Intervention for Alcohol Use Disorders (LBMI-A)...
August 2017: Psychology of Addictive Behaviors: Journal of the Society of Psychologists in Addictive Behaviors
https://www.readbyqxmd.com/read/28680439/stomatal-closure-and-rise-in-ros-no-of-arabidopsis-guard-cells-by-tobacco-microbial-elicitors-cryptogein-and-harpin
#16
Gunja Gayatri, Srinivas Agurla, Kazuyuki Kuchitsu, Kondreddy Anil, Appa R Podile, Agepati S Raghavendra
Plants use stomatal closure mediated by elicitors as the first step of the innate immune response to restrict the microbial entry. We present a comprehensive study of the effect of cryptogein and harpin, two elicitors from microbial pathogens of tobacco, on stomatal closure and guard cell signaling components in Arabidopsis thaliana, a model plant. Cryptogein as well as harpin induced stomatal closure, while elevating the levels of reactive oxygen species (ROS) and nitric oxide (NO) in the guard cells of A...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28671619/independent-preharvest-applications-of-methyl-jasmonate-and-chitosan-elicit-differential-upregulation-of-defense-related-genes-with-reduced-incidence-of-gray-mold-decay-during-postharvest-storage-of-fragaria-chiloensis-fruit
#17
Gabriela M Saavedra, Eugenio Sanfuentes, Pablo M Figueroa, Carlos R Figueroa
The Chilean strawberry (Fragaria chiloensis) fruit has interesting organoleptic properties, but its postharvest life is affected by gray mold decay caused by Botrytis cinerea. The effect of preharvest applications of methyl jasmonate (MeJA) or chitosan on the molecular defense-related responses and protection against gray mold decay were investigated in Chilean strawberry fruit during postharvest storage. Specifically, we inoculated harvested fruit with B. cinerea spores and studied the expression of genes encoding for the pathogenesis-related (PR) proteins β-1,3-glucanases (FcBG2-1, FcBG2-2 and FcBG2-3) and chitinases (FcCHI2-2 and FcCHI3-1), and for polygalacturonase inhibiting proteins (FcPGIP1 and FcPGIP2) at 0, 2, 24, 48, and 72 h post inoculation (hpi)...
July 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28667819/airborne-signals-by-trichoderma-fungi-stimulate-iron-uptake-responses-in-roots-resulting-in-priming-of-jasmonic-acid-dependent-defences-in-shoots-of-arabidopsis-thaliana-and-solanum-lycopersicum
#18
Ainhoa Martínez-Medina, Saskia C M Van Wees, Corné M J Pieterse
Root colonization by Trichoderma fungi can trigger induced systemic resistance (ISR). In Arabidopsis, Trichoderma-ISR relies on the transcription factor MYB72, which plays a dual role in the onset of ISR and the activation of Fe uptake responses. Volatile compounds (VCs) from rhizobacteria are important elicitors of MYB72 in Arabidopsis roots. Here we investigated the mode of action of VCs from Trichoderma fungi in the onset of ISR and Fe uptake responses. VCs from Trichoderma asperellum and Trichoderma harzianum were applied in an in vitro split-plate system with Arabidopsis or tomato seedlings...
July 1, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28666461/glyceollins-trigger-anti-proliferative-effects-through-estradiol-dependent-and-independent-pathways-in-breast-cancer-cells
#19
Sylvain Lecomte, Frederic Chalmel, François Ferriere, Frederic Percevault, Nicolas Plu, Christian Saligaut, Claire Surel, Marie Lelong, Theo Efstathiou, Farzad Pakdel
BACKGROUND: Estrogen receptors (ER) α and β are found in both women and men in many tissues, where they have different functions, including having roles in cell proliferation and differentiation of the reproductive tract. In addition to estradiol (E2), a natural hormone, numerous compounds are able to bind ERs and modulate their activities. Among these compounds, phytoestrogens such as isoflavones, which are found in plants, are promising therapeutics for several pathologies. Glyceollins are second metabolites of isoflavones that are mainly produced in soybean in response to an elicitor...
June 30, 2017: Cell Communication and Signaling: CCS
https://www.readbyqxmd.com/read/28664370/total-crude-protein-extract-of-trichoderma-spp-induces-systemic-resistance-in-pearl-millet-against-the-downy-mildew-pathogen
#20
Boregowda Nandini, Puttaswamy Hariprasad, Harohalli Nanjegowda Shankara, Harischandra Sripathy Prakash, Nagaraja Geetha
Several proteins and peptides of microbial origin are reported for their elicitor properties, which play a vital role in the development of local and systemic resistances in plants. In this study, the efficacy of total crude proteins (TCP) extracted from six different Trichoderma spp. (T. asperellum, T. harzianum, T. atroviride, T. virens, T. longibrachiatum, and T. brevicompactum) was evaluated for their ability to elicit defense responses in pearl millet against downy mildew disease. Priming of pearl millet seeds (with or without mannitol) with different concentrations of TCP from Trichoderma spp...
July 2017: 3 Biotech
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