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https://www.readbyqxmd.com/read/29149328/mir858-mediated-regulation-of-flavonoid-specific-myb-transcription-factor-genes-controls-resistance-to-pathogen-infection-in-arabidopsis
#1
Rosany Camargo-Ramírez, Beatriz Val-Torregrosa, Blanca San Segundo
MicroRNAs (miRNAs) are a class of short endogenous non-coding small RNAs that direct post-transcriptional gene silencing in eukaryotes. In plants, the expression of a large number of miRNAs has been shown to be regulated during pathogen infection. However, the functional role of the majority of these pathogen-regulated miRNAs has not been elucidated. In this work, we investigated the role of Arabidopsis miR858 in the defense response of Arabidopsis plants to infection by fungal pathogens with necrotrophic (Plectosphaerella cucumerina) or hemibiotrophic (Fusarium oxysporum and Colletotrichum higginsianum) lifestyles...
November 15, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29147762/phenotypic-effects-and-inhibition-of-botrydial-biosynthesis-induced-by-different-plant-based-elicitors-in-botrytis-cinerea
#2
Eva Liñeiro, Antonio J Macias-Sánchez, Marisa Espinazo, Jesús M Cantoral, Javier Moraga, Isidro G Collado, Francisco J Fernández-Acero
Botrytis cinerea is considered a model organism for the study of plant-pathogen interaction showing great genetic diversity and a high degree of morphological variability depending on environmental conditions. The use of new compounds and plant-based elicitors may trigger the expression of different B. cinerea genes, providing new sources of virulence factors. This work is focused on elucidating the phenotypic effect in B. cinerea of different carbon sources such as glucose, cellulose and tomato cell walls (TCW)...
November 17, 2017: Current Microbiology
https://www.readbyqxmd.com/read/29138909/improvement-of-biosynthesis-and-accumulation-of-bioactive-compounds-by-elicitation-in-adventitious-root-cultures-of-polygonum-multiflorum
#3
Thanh-Tam Ho, Jong-Du Lee, Cheol-Seung Jeong, Kee-Yoeup Paek, So-Young Park
We examined the effects of abiotic (methyl jasmonate [MeJA] and salicylic acid [SA]) and biotic (yeast extract and chitosan) elicitors for improvement of bioactive compounds production on adventitious root cultures in Polygonum multiflorum. The application of yeast extract resulted in significantly (p ≤ 0.05) higher dry root biomass (9.98 g/L) and relative growth rate versus the control. Cultures treated with abiotic elicitors showed higher percentage of dry weight than the other samples. Low concentrations of all elicitors (50 μM MeJA and SA, and 50 mg/L yeast extract) improved secondary metabolite production except for chitosan, whose performance was worse than that of the control...
November 14, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29131830/transcriptome-profiling-and-digital-gene-expression-analysis-of-sweet-potato-for-the-identification-of-putative-genes-involved-in-the-defense-response-against-fusarium-oxysporum-f-sp-batatas
#4
Yuli Lin, Weikun Zou, Shiqiang Lin, Dennis Onofua, Zhijian Yang, Haizhou Chen, Songliang Wang, Xuanyang Chen
Sweet potato production is constrained by Fusarium wilt, which is caused by Fusarium oxysporum f. sp. batatas (Fob). The identification of genes related to disease resistance and the underlying mechanisms will contribute to improving disease resistance via sweet potato breeding programs. In the present study, we performed de novo transcriptome assembly and digital gene expression (DGE) profiling of sweet potato challenged with Fob using Illumina HiSeq technology. In total, 89,944,188 clean reads were generated from 12 samples and assembled into 101,988 unigenes with an average length of 666 bp; of these unigenes, 62,605 (61...
2017: PloS One
https://www.readbyqxmd.com/read/29131648/treatment-of-vinca-minor-leaves-with-methyl-jasmonate-extensively-alters-the-pattern-and-composition-of-indole-alkaloids
#5
Sara Abouzeid, Ulrike Beutling, Frank Surup, Fatma M Abdel Bar, Mohamed M Amer, Farid A Badria, Mahdi Yahyazadeh, Mark Brönstrup, Dirk Selmar
Alkaloids extracted from mature Vinca minor leaves were fractionated by preparative HPLC. By means of HRMS and NMR data, the main alkaloids were identified as vincamine, strictamine, 10-hydroxycathofoline, and vincadifformine. Upon treatment with methyl jasmonate (MeJA), the pattern and composition of the indole alkaloids changed extensively. While 10-hydroxycathofoline and strictamine concentrations remained unaltered, vincamine and vincadifformine levels showed a dramatic reduction. Upon MeJA treatment, four other indole alkaloids were detected in high quantities...
November 13, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/29125028/molecular-basis-of-citrus-sunki-susceptibility-and-poncirus-trifoliata-resistance-upon-phytophthora-parasitica-attack
#6
Ronaldo J D Dalio, Heros José Máximo, Tiago Silva Oliveira, Thamara Azevedo, Henrique Leme Felizatti, Magnólia Araújo Campos, Marcos Antonio Antonio Machado
Coevolution has shaped the molecular basis of an extensive number of defense mechanisms in plant-pathogen interactions. Phytophthora parasitica, a hemibiothrophic oomycete pathogen and the causal agent of citrus root rot and gummosis, interacts differently with Citrus sunki and Poncirus trifoliata; two commonly favored citrus rootstocks that are recognized as susceptible and resistant, respectively, to P. parasitica. The molecular core of these interactions remains elusive. Here, we provide evidences on the defense strategies employed by both susceptible and resistant citrus rootstocks, in parallel with P...
November 10, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/29124962/effect-of-ultrasonic-waves-on-crocin-and-safranal-content-and-expression-of-their-controlling-genes-in-suspension-culture-of-saffron-crocus-sativus%C3%A2-l
#7
Tofigh Taherkhani, Rasool Asghari Zakaria, Mansoor Omidi, Naser Zare
The expression of biosynthesis controlling genes of crocin and safranal in saffron (Crocus sativus) can be influenced by ultrasonic waves. Sterilized saffron corms were cultured in a ½-MS medium supplemented by 2-4-D and BAP.  Saffron callus cells were treated with ultrasonic waves in a cellular suspension culture under optimal growth conditions. The samples were collected at 24 and 72 hours after treatment in three replications. The secondary metabolites were measured by high-performance liquid chromatography and the gene expression was analysed by the real-time polymerase chain reaction...
November 10, 2017: Natural Product Research
https://www.readbyqxmd.com/read/29122175/enhancing-taxol-production-in-a-novel-endophytic-fungus-aspergillus-aculeatinus-tax-6-isolated-from-taxus-chinensis-var-mairei
#8
Weichuan Qiao, Fei Ling, Lei Yu, Yifang Huang, Ting Wang
Taxol is a curatively effective but rare anti-tumor agent extracted from Taxus (yew) barks; however, the high cost and low production of the extraction method have limited its widespread use. In this study, fungi isolated from Taxus chinensis var. mairei were tested for their ability to produce taxol. High performance liquid chromatography combined with mass spectrometry confirmed that Aspergillus aculeatinus Tax-6, one of the endophytic fungi, could produce taxol in potato dextrose agar liquid medium. NaOAc, Cu(2+), and salicylic acid were introduced into the medium to enhance taxol production of strain Tax-6 because NaOAc is an important precursor of taxol, Cu(2+) may enhance the activity of oxidase and catalyze the formation of taxol, and salicylic acid could be an elicitor signal...
December 2017: Fungal Biology
https://www.readbyqxmd.com/read/29121087/the-gram-negative-sensing-receptor-pgrp-lc-contributes-to-grooming-induction-in-drosophila
#9
Aya Yanagawa, Claudine Neyen, Bruno Lemaitre, Frédéric Marion-Poll
Behavioral resistance protects insects from microbial infection. However, signals inducing insect hygiene behavior are still relatively unexplored. Our previous study demonstrated that olfactory signals from microbes enhance insect hygiene behavior, and gustatory signals even induce the behavior. In this paper, we postulated a cross-talk between behavioral resistance and innate immunity. To examine this hypothesis, we employed a previously validated behavioral test to examine the function of taste signals in inducing a grooming reflex in decapitated flies...
2017: PloS One
https://www.readbyqxmd.com/read/29112407/secondary-metabolites-in-allergic-plant-pollen-samples-modulate-afferent-neurons-and-murine-tracheal-rings
#10
Alen Božičević, Maria De Mieri, Christina Nassenstein, Silke Wiegand, Matthias Hamburger
Plant pollens are strong airborne elicitors of asthma. Their proteinaceous allergens have been studied intensively, but little is known about a possible contribution of pollen secondary metabolites to the nonallergic exacerbation of asthma. Pollen samples originating from 30 plant species were analyzed by HPLC coupled to PDA, ESIMS, and ELSD detectors and off-line NMR spectroscopy. Polyamine conjugates, flavonoids, and sesquiterpene lactones were identified. Polyamine conjugates were characteristic of all Asteraceae species...
November 7, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/29107936/a-harpin-elicitor-induces-the-expression-of-a-coiled-coil-nucleotide-binding-leucine-rich-repeat-cc-nb-lrr-defense-signaling-gene-and-others-functioning-during-defense-to-parasitic-nematodes
#11
Weasam A R Aljaafri, Brant T McNeece, Bisho R Lawaju, Keshav Sharma, Prakash M Niruala, Shankar R Pant, David H Long, Kathy S Lawrence, Gary W Lawrence, Vincent P Klink
The bacterial effector harpin induces the transcription of the Arabidopsis thaliana NON-RACE SPECIFIC DISEASE RESISTANCE 1/HARPIN INDUCED1 (NDR1/HIN1) coiled-coil nucleotide binding leucine rich repeat (CC-NB-LRR) defense signaling gene. In Glycine max, Gm-NDR1-1 transcripts have been detected within root cells undergoing a natural resistant reaction to parasitism by the syncytium-forming nematode Heterodera glycines, functioning in the defense response. Expressing Gm-NDR1-1 in Gossypium hirsutum leads to resistance to Meloidogyne incognita parasitism...
October 13, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29098503/synergistic-effects-of-plant-defense-elicitors-and-trichoderma-harzianum-on-enhanced-induction-of-antioxidant-defense-system-in-tomato-against-fusarium-wilt-disease
#12
Andleeb Zehra, Mukesh Meena, Manish Kumar Dubey, Mohd Aamir, R S Upadhyay
Plant defense against their pathogens can be induced by a complex network of different inducers. The present study investigates the synergistic effect of Trichoderma harzianum, exogenous salicylic acid (SA) and methyl jasmonate (MeJA) over the response and regulation of the antioxidant defense mechanisms and lipid peroxidation in tomato plants against Fusarium wilt disease. In the present work, tomato plants were infected by Fusarium oxysporum f. sp. lycopersici 3 days after inoculated with T. harzianum and/or sprayed daily for 3 days with chemical inducers (SA and MeJA)...
November 2, 2017: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/29083264/against-the-odds-human-values-arising-in-unfavourable-circumstances-elicit-the-feeling-of-being-moved
#13
Madelijn Strick, Jantine van Soolingen
People sometimes say they are "moved" or "touched" by something. Although the experience is familiar to most, systematic research on being moved has just begun. The current research aims to advance our understanding of the prototypical elicitors of being moved. We tested the hypothesis that being moved is elicited by core values (i.e. values that are particularly central to being human) that manifest themselves in circumstances that are unfavourable to their emergence. In three experiments, two with text stimuli and one with pictorial stimuli, we found compelling evidence that the same core value (e...
October 30, 2017: Cognition & Emotion
https://www.readbyqxmd.com/read/29081787/plant-hormesis-management-with-biostimulants-of-biotic-origin-in-agriculture
#14
REVIEW
Marcela Vargas-Hernandez, Israel Macias-Bobadilla, Ramon G Guevara-Gonzalez, Sergio de J Romero-Gomez, Enrique Rico-Garcia, Rosalia V Ocampo-Velazquez, Luz de L Alvarez-Arquieta, Irineo Torres-Pacheco
Over time plants developed complex mechanisms in order to adapt themselves to the environment. Plant innate immunity is one of the most important mechanisms for the environmental adaptation. A myriad of secondary metabolites with nutraceutical features are produced by the plant immune system in order to get adaptation to new environments that provoke stress (stressors). Hormesis is a phenomenon by which a stressor (i.e., toxins, herbicides, etc.) stimulates the cellular stress response, including secondary metabolites production, in order to help organisms to establish adaptive responses...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29080621/biomass-accumulation-of-panax-vietnamensis-in-cell-suspension-cultures-varies-with-addition-of-plant-growth-regulators-and-organic-additives
#15
Tuan Tran Trong, Dieu-Hien Truong, Hoang Chinh Nguyen, Dieu-Thai Tran, Huyen-Trang Nguyen Thi, Giap Do Dang, Ho Nguyen Huu
OBJECTIVE: To evaluate the impact of plant growth regulators including kinetin (KN), benzyl adenine and naphthalene acetic acid, yeast extract and casein hydrolyzate on biomass accumulation of Vietnamese ginseng Panax vietnamensis (P. vietnamensis) in cell suspension culture. METHODS: Cell suspension cultures were established from friable calluses derived from leaves and petioles of 3-year-old in-vitro P. vietnamensis plants. The cell suspension cultures were grown in Murashige and Skoog basal media supplemented with various concentrations of KN, benzyl adenine, naphthalene acetic acid, and yeast extract and casein hydrolyzate...
September 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/29065548/cadmium-disrupts-subcellular-organelles-including-chloroplasts-resulting-in-melatonin-induction-in-plants
#16
Hyoung-Yool Lee, Kyoungwhan Back
Cadmium is a well-known elicitor of melatonin synthesis in plants, including rice. However, the mechanisms by which cadmium induces melatonin induction remain elusive. To investigate whether cadmium influences physical integrities in subcellular organelles, we treated tobacco leaves with either CdCl₂ or AlCl₃ and monitored the structures of subcellular organelles-such as chloroplasts, mitochondria, and the endoplasmic reticulum (ER)-using confocal microscopic analysis. Unlike AlCl₃ treatment, CdCl₂ (0...
October 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29065539/ureidopyrazine-derivatives-synthesis-and-biological-evaluation-as-anti-infectives-and-abiotic-elicitors
#17
Ghada Bouz, Martin Juhás, Pavlína Niklová, Ondřej Janďourek, Pavla Paterová, Jiří Janoušek, Lenka Tůmová, Zuzana Kovalíková, Petr Kastner, Martin Doležal, Jan Zitko
Tuberculosis (TB) caused by Mycobacterium tuberculosis (Mtb) has become a frequently deadly infection due to increasing antimicrobial resistance. This serious issue has driven efforts worldwide to discover new drugs effective against Mtb. One research area is the synthesis and evaluation of pyrazinamide derivatives as potential anti-TB drugs. In this paper we report the synthesis and biological evaluations of a series of ureidopyrazines. Compounds were synthesized by reacting alkyl/aryl isocyanates with aminopyrazine or with propyl 5-aminopyrazine-2-carboxylate...
October 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29056941/nicotiana-benthamiana-elicitor-inducible-leucine-rich-repeat-receptor-like-protein-assists-bamboo-mosaic-virus-cell-to-cell-movement
#18
I-Hsuan Chen, Ying-Ping Huang, Ching-Han Tseng, Jian-Tang Ni, Chung-Han Tsai, Yau-Heiu Hsu, Ching-Hsiu Tsai
For successful infection, a virus requires various host factors at different stages such as translation, targeting, replication, and spreading. One of the host genes upregulated after Nicotiana benthamiana infection with Bamboo mosaic virus (BaMV), a single-stranded positive-sense RNA potexvirus, assists in viral movement. To understand how this host protein is involved in BaMV movement, we cloned its full-length cDNA by rapid amplification of cDNA ends. The gene has 3199 nt and encodes a 969-amino acid polypeptide...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29053864/damage-associated-responses-of-the-host-contribute-to-defence-against-cyst-nematodes-but-not-root-knot-nematodes
#19
Syed Jehangir Shah, Muhammad Shahzad Anjam, Badou Mendy, Muhammad Arslan Anwer, Samer S Habash, Jose L Lozano-Torres, Florian M W Grundler, Shahid Siddique, Robert Hancock
When nematodes invade and subsequently migrate within plant roots, they generate cell wall fragments (in the form of oligogalacturonides; OGs) that can act as damage-associated molecular patterns and activate host defence responses. However, the molecular mechanisms mediating damage responses in plant-nematode interactions remain unexplored. Here, we characterized the role of a group of cell wall receptor proteins in Arabidopsis, designated as polygalacturonase-inhibiting proteins (PGIPs), during infection with the cyst nematode Heterodera schachtii and the root-knot nematode Meloidogyne incognita...
October 19, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29051662/improving-phenolic-bioactive-linked-anti-hyperglycemic-functions-of-dark-germinated-barley-sprouts-hordeum-vulgare-l-using-seed-elicitation-strategy
#20
Ramnarain Ramakrishna, Dipayan Sarkar, Avani Manduri, Shreyas Ganesan Iyer, Kalidas Shetty
Sprouts of cereal grains, such as barley (Hordeum vulgare L.), are a good source of beneficial phenolic bioactives. Such health relevant phenolic bioactives of cereal sprouts can be targeted to manage chronic hyperglycemia and oxidative stress commonly associated with type 2 diabetes (T2D). Therefore improving phenolic bioactives by stimulating plant endogenous defense responses such as protective pentose phosphate pathway (PPP) during sprouting has significant merit. Based on this metabolic rationale, this study aimed to enhance phenolic bioactives and associated antioxidant and anti-hyperglycemic functions in dark germinated barley sprouts using exogenous elicitor treatments...
October 2017: Journal of Food Science and Technology
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