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https://www.readbyqxmd.com/read/29365162/microrna1917-targets-ctr4-splice-variants-to-regulate-ethylene-responses-in-tomato
#1
Yanling Wang, Wenxiong Zou, Yan Xiao, Lina Cheng, Yudong Liu, Song Gao, Zihang Shi, Yun Jiang, Mingfang Qi, Tao Xu, Tianlai Li
Ethylene perception is regulated by receptors, and the downstream protein CONSTITUTIVE TRIPLE RESPONSE1 is a key suppressor of ethylene signalling. The non-conserved tomato (Solanum lycopersicum) microRNA1917 (Sly-miR1917) mediates degradation of SlCTR4 splice variants (SlCTR4sv) but the molecular details of this pathway remain unknown. Sly-miR1917 and the targeted SlCTR4sv are ubiquitously expressed in all tomato organs. Overexpression of Sly-miR1917 enhances ethylene responses, including the triple response in etiolated seedlings, in the absence of ethylene, as well as epinastic petiole growth, accelerated pedicel abscission, and fruit ripening...
January 22, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29298835/histone-deacetylases-srt1-and-srt2-interact-with-enap1-to-mediate-ethylene-induced-transcriptional-repression
#2
Fan Zhang, Likai Wang, Eun Esther Ko, Kevin Shao, Hong Qiao
Ethylene plays pleotropic roles in plant growth, plant development, and stress responses. Although the effects of ethylene on plants are well documented, little is known about molecular-level events that result in transcriptional repression during the ethylene response.  In this study, we found that two histone deacetylases, SRT1 and SRT2, interact with ENAP1, which associates with EIN2 in the nucleus. Genetic and transcriptome analyses revealed that SRT1 and SRT2 are required for negative regulation of certain ethylene-responsive genes...
January 3, 2018: Plant Cell
https://www.readbyqxmd.com/read/29187569/dynamics-of%C3%A2-lotus-japonicus%C3%A2-ethylene-production-in-response-to-compatible-nod-factor
#3
Dugald Elgin Reid, Huijun Liu, Simon Kelly, Yasuyuki Kawaharada, Terry Mun, Stig U Andersen, Guilhem J Desbrosses, Jens Stougaard
Establishment of symbiotic nitrogen-fixation in legumes is regulated by the plant hormone ethylene, but it has remained unclear whether and how its biosynthesis is regulated by the symbiotic pathway. We established a sensitive ethylene detection system for Lotus japonicus and found that ethylene production increased as early as six hours after inoculation with Mesorhizobium loti. This ethylene response was dependent on Nod factor production by compatible rhizobia. Analyses of nodulation mutants showed that perception of Nod factor was required for ethylene emission, while downstream transcription factors including CYCLOPS, NIN and ERN1 were not required for this response...
November 29, 2017: Plant Physiology
https://www.readbyqxmd.com/read/29114258/ethylene-mediates-alkaline-induced-rice-growth-inhibition-by-negatively-regulating-plasma-membrane-h-atpase-activity-in-roots
#4
Haifei Chen, Quan Zhang, Hongmei Cai, Fangsen Xu
pH is an important factor regulating plant growth. Here, we found that rice was better adapted to low pH than alkaline conditions, as its growth was severely inhibited at high pH, with shorter root length and an extreme biomass reduction. Under alkaline stress, the expression of genes for ethylene biosynthesis enzymes in rice roots was strongly induced by high pH and exogenous ethylene precursor ACC and ethylene overproduction in etol1-1 mutant aggravated the alkaline stress-mediated inhibition of rice growth, especially for the root elongation with decreased cell length in root apical regions...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29090631/bacillus-cereus-ar156-activates-defense-responses-to-pseudomonas-syringae-pv-tomato-in-arabidopsis-thaliana-similarly-to-flg22
#5
Shune Wang, Ying Zheng, Chun Gu, Chan He, Mengying Yang, Xin Zhang, Jianhua Guo, Hongwei Zhao, Dongdong Niu
Bacillus cereus AR156 (AR156) is a plant growth promoting rhizobacterium capable of inducing systemic resistance to Pseudomonas syringae pv. tomato (Pst) in Arabidopsis thaliana (Arabidopsis). Here we show that when applied to Arabidopsis leaves, AR156 acted similarly to flg22, a typical pathogen-associated molecular pattern (PAMP), in initiating PAMP-triggered immunity (PTI). AR156-elicited PTI responses included phosphorylation of MPK3 and MPK6, induction of the expression of defense-related genes PR1, FRK1, WRKY22, and WRKY29; production of reactive oxygen species; and callose deposition...
November 1, 2017: Molecular Plant-microbe Interactions: MPMI
https://www.readbyqxmd.com/read/28928762/novel-protein-protein-inhibitor-based-approach-to-control-plant-ethylene-responses-synthetic-peptides-for-ripening-control
#6
Mareike Kessenbrock, Simone M Klein, Lena Müller, Mauricio Hunsche, Georg Noga, Georg Groth
Ethylene signaling is decisive for many plant developmental processes. Among these, control of senescence, abscission and fruit ripening are of fundamental relevance for global agriculture. Consequently, detailed knowledge of the signaling network along with the molecular processes of signal perception and transfer are expected to have high impact on future food production and agriculture. Recent advances in ethylene research have demonstrated that signaling of the plant hormone critically depends on the interaction of the ethylene receptor family with the NRAMP-like membrane protein ETHYLENE INSENSITIVE 2 (EIN2) at the ER membrane, phosphorylation-dependent proteolytic processing of ER-localized EIN2 and subsequent translocation of the cleaved EIN2 C-terminal polypeptide (EIN2-CEND) to the nucleus...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28911019/early-arabidopsis-root-hair-growth-stimulation-by-pathogenic-strains-of-pseudomonas-syringae
#7
Tamara Pecenková, Martin Janda, Jitka Ortmannová, Vladimíra Hajná, Zuzana Stehlíková, Viktor Žárský
Background and Aims: Selected beneficial Pseudomonas spp. strains have the ability to influence root architecture in Arabidopsis thaliana by inhibiting primary root elongation and promoting lateral root and root hair formation. A crucial role for auxin in this long-term (1week), long-distance plant-microbe interaction has been demonstrated. Methods: Arabidopsis seedlings were cultivated in vitro on vertical plates and inoculated with pathogenic strains Pseudomonas syringae pv...
September 1, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28890725/the-biphasic-root-growth-response-to-abscisic-acid-in-arabidopsis-involves-interaction-with-ethylene-and-auxin-signalling-pathways
#8
Xiaoqing Li, Lin Chen, Brian G Forde, William J Davies
Exogenous abscisic acid (ABA) is known to either stimulate or inhibit root growth, depending on its concentration. In this study, the roles of ethylene and auxin in this biphasic effect of ABA on root elongation were investigated using chemical inhibitors and mutants. Inhibitors of ethylene perception and biosynthesis and an auxin influx inhibitor were all found to block the inhibitory effect of high ABA concentrations, but not the stimulatory effect of low ABA concentrations. In addition, three ethylene-insensitive mutants (etr1-1, ein2-1, and ein3-1), two auxin influx mutants (aux1-7, aux1-T) and an auxin-insensitive mutant (iaa7/axr2-1) were all insensitive to the inhibitory effect of high ABA concentrations...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28874528/ein2-mediates-direct-regulation-of-histone-acetylation-in-the-ethylene-response
#9
Fan Zhang, Likai Wang, Bin Qi, Bo Zhao, Eun Esther Ko, Nathaniel D Riggan, Kevin Chin, Hong Qiao
Ethylene gas is essential for developmental processes and stress responses in plants. Although the membrane-bound protein EIN2 is critical for ethylene signaling, the mechanism by which the ethylene signal is transduced remains largely unknown. Here we show the levels of H3K14Ac and H3K23Ac are correlated with the levels of EIN2 protein and demonstrate EIN2 C terminus (EIN2-C) is sufficient to rescue the levels of H3K14/23Ac of ein2-5 at the target loci, using CRISPR/dCas9-EIN2-C. Chromatin immunoprecipitation followed by deep sequencing (ChIP-seq) and ChIP-reChIP-seq analyses revealed that EIN2-C associates with histone partially through an interaction with EIN2 nuclear-associated protein1 (ENAP1), which preferentially binds to the genome regions that are associated with actively expressed genes both with and without ethylene treatments...
September 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28853320/description-of-the-nicotiana-benthamiana-cercospora-nicotianae-pathosystem
#10
József Fodor, Evelin Kámán-Tóth, Tamás Dankó, Ildikó Schwarczinger, Zoltán Bozsó, Miklos Pogany
Nicotiana benthamiana is a valuable model organism in plant biology research. This report describes its extended applicability in the field of molecular plant pathology by introducing a non-biotrophic fungal pathogen Cercospora nicotianae that can be conveniently used under laboratory conditions, consistently induces a necrotic leaf spot disease on Nicotiana benthamiana, and is specialized on solanaceous plants. Our inoculation studies showed that a filamentous fungal pathogen, Cercospora nicotianae more effectively colonizes N...
August 30, 2017: Phytopathology
https://www.readbyqxmd.com/read/28724956/mapping-resistance-responses-to-sclerotinia-infestation-in-introgression-lines-of-brassica-juncea-carrying-genomic-segments-from-wild-brassicaceae-b-fruticulosa
#11
Kusum Rana, Chhaya Atri, Mehak Gupta, Javed Akhatar, Prabhjodh S Sandhu, Nitin Kumar, Ravinder Jaswal, Martin J Barbetti, Surinder S Banga
Sclerotinia stem rot (Sclerotinia sclerotiorum) is a major disease of Brassica oilseeds. As suitable donors to develop resistant cultivars are not available in crop Brassicas, we introgressed resistance from a wild Brassicaceae species, B. fruticulosa. We produced 206 B. juncea-B. fruticulosa introgression lines (ILs). These were assessed for pollen grain fertility, genome size variations and resistance responses to Sclerotinia following stem inoculations under disease-conducive conditions. Of these, 115 ILs showing normal fertility and genome size were selected for cytogenetic characterization using florescent genomic in situ hybridization (Fl-GISH)...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716006/ethylene-induces-combinatorial-effects-of-histone-h3-acetylation-in-gene-expression-in-arabidopsis
#12
Likai Wang, Fan Zhang, Siddharth Rode, Kevin K Chin, Eun Esther Ko, Jonghwan Kim, Vishwanath R Iyer, Hong Qiao
BACKGROUND: Histone acetylation and deacetylation are essential for gene regulation and have been implicated in the regulation of plant hormone responses. Many studies have indicated the role of histone acetylation in ethylene signaling; however, few studies have investigated how ethylene signaling regulates the genomic landscape of chromatin states. Recently, we found that ethylene can specifically elevate histone H3K14 acetylation and the non-canonical histone H3K23 acetylation in etiolated seedlings and the gene activation is positively associated with the elevation of H3K14Ac and H3K23Ac in response to ethylene...
July 17, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28601518/biochemical-responses-and-ultrastructural-changes-in-ethylene-insensitive-mutants-of-arabidopsis-thialiana-subjected-to-bisphenol-a-exposure
#13
Imran Ali, Mehmood Jan, Abdul Wakeel, Azizullah Azizullah, Bohan Liu, Faisal Islam, Abid Ali, M K Daud, Yihua Liu, Yinbo Gan
Bisphenol A (BPA), an important raw material in plastic industry, has become a serious environmental contaminant due to its wide spread use in different products and increasing release into the environment. BPA is known to cause adverse effects in living organisms including plants. Several studies reported that BPA affects growth and development in plants, mainly through oxidative stress. Plants are known to generally cope with stress mainly through hormonal regulation and adaptation, but little is known about the role of plant hormones in plants under BPA stress...
October 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28402161/ein2-mediated-signaling-is-involved-in-pre-invasion-defense-in-nicotiana-benthamiana-against-potato-late-blight-pathogen-phytophthora-infestans
#14
Soriya Rin, Yuri Mizuno, Yusuke Shibata, Mayuka Fushimi, Shinpei Katou, Ikuo Sato, Sotaro Chiba, Kazuhito Kawakita, Daigo Takemoto
Nicotiana benthamiana ABCG1 and ABCG2 are ABC transporters which are probably involved in the export of capsidiol, the major phytoalexin of Nicotiana species. While capsidiol export by these transporters plays an essential role in post-invasion defense against Phytophthora infestans, they also export unidentified antimicrobial compound(s) involved in pre-invasion defense. In this study, promoter activity of NbABCG2 (Pabcg2a) was analyzed using a GFP marker. Expression of GFP under the control of Pabcg2a was significantly increased by co-expression with the INF1 elicitor from P...
April 3, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28400495/constitutively-active-arabidopsis-map-kinase-3-triggers-defense-responses-involving-salicylic-acid-and-summ2-resistance-protein
#15
Baptiste Genot, Julien Lang, Souha Berriri, Marie Garmier, Françoise Gilard, Stéphanie Pateyron, Katrien Haustraete, Dominique Van Der Straeten, Heribert Hirt, Jean Colcombet
Mitogen-activated protein kinases (MAPKs) are important regulators of plant immunity. Most of the knowledge about the function of these pathways is derived from loss-of-function approaches. Using a gain-of-function approach, we investigated the responses controlled by a constitutively active (CA) MPK3 in Arabidopsis thalianaCA-MPK3 plants are dwarfed and display a massive derepression of defense genes associated with spontaneous cell death as well as the accumulation of reactive oxygen species, phytoalexins, and the stress-related hormones ethylene and salicylic acid (SA)...
June 2017: Plant Physiology
https://www.readbyqxmd.com/read/28344560/nitric-oxide-has-a-concentration-dependent-effect-on-the-cell-cycle-acting-via-ein2-in-arabidopsis-thaliana-cultured-cells
#16
Galina V Novikova, Luis A J Mur, Alexander V Nosov, Artem A Fomenkov, Kirill S Mironov, Anna S Mamaeva, Evgeny S Shilov, Victor Y Rakitin, Michael A Hall
Ethylene is known to influence the cell cycle (CC) via poorly characterized roles whilst nitric oxide (NO) has well-established roles in the animal CC but analogous role(s) have not been reported for plants. As NO and ethylene signaling events often interact we examined their role in CC in cultured cells derived from Arabidopsis thaliana wild-type (Col-0) plants and from ethylene-insensitive mutant ein2-1 plants. Both NO and ethylene were produced mainly during the first 5 days of the sub-cultivation period corresponding to the period of active cell division...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28300216/ein3-and-sos2-synergistically-modulate-plant-salt-tolerance
#17
Ruidang Quan, Juan Wang, Dexin Yang, Haiwen Zhang, Zhijin Zhang, Rongfeng Huang
Ethylene biosynthesis and the ethylene signaling pathway regulate plant salt tolerance by activating the expression of downstream target genes such as those related to ROS and Na(+)/K(+) homeostasis. The Salt Overly Sensitive (SOS) pathway regulates Na(+)/K(+) homeostasis in Arabidopsis under salt stress. However, the connection between these two pathways is unclear. Through genetic screening, we identified two sos2 alleles as salt sensitive mutants in the ein3-1 background. Neither Ethylene-Insensitive 2 (EIN2) nor EIN3 changed the expression patterns of SOS genes including SOS1, SOS2, SOS3 and SOS3-like Calcium Binding Protein 8 (SCaBP8), but SOS2 activated the expression of one target gene of EIN3, Ethylene and Salt-inducible ERF 1 (ESE1)...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28293845/kinase-assay-for-constitutive-triple-response-1-ctr1-in-arabidopsis-thaliana
#18
Han Yong Lee, Gyeong Mee Yoon
Protein kinases are central components of signal transduction pathways in the cell. They catalyze the phosphorylation of substrate proteins, resulting in changes of the activity, localization, stability, and protein interactions of the substrates, ultimately coordinating the activity of important cellular processes. CONSTITUTIVE TRIPLE RESPONSE 1 (CTR1) is a Raf-like protein kinase that functions as a negative regulator in the phytohormone ethylene signaling pathway. CTR1 physically interacts with ethylene receptors via its N-terminal domain at the endoplasmic reticulum, and is involved in suppressing ethylene signaling in the absence of ethylene...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28293243/induced-systemic-resistance-against-botrytis-cinerea-by-bacillus-cereus-ar156-through-a-ja-et-and-npr1-dependent-signaling-pathway-and-activates-pamp-triggered-immunity-in-arabidopsis
#19
Pingping Nie, Xia Li, Shune Wang, Jianhua Guo, Hongwei Zhao, Dongdong Niu
Induced resistance response is a potent and cost effective plant defense against pathogen attack. The effectiveness and underlying mechanisms of the suppressive ability by Bacillus cereus AR156 to Pseudomonas syringae pv. tomato DC3000 (Pst DC3000) in Arabidopsis has been investigated previously; however, the strength of induced systemic resistance (ISR) activity against Botrytis cinerea remains unknown. Here, we show that root-drench application of AR156 significantly reduces disease incidence through activation of ISR...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28286514/ethylene-improves-root-system-development-under-cadmium-stress-by-modulating-superoxide-anion-concentration-in-arabidopsis-thaliana
#20
Ann Abozeid, Zuojia Ying, Yingchao Lin, Jia Liu, Zhonghua Zhang, Zhonghua Tang
This work aims at identifying the effects of ethylene on the response of Arabidopsis thaliana root system to cadmium chloride (CdCl2) stress. Two ethylene-insensitive mutants, ein2-5 and ein3-1eil1-1, were subjected to (25, 50, 75, and 100 μM) CdCl2 concentrations, from which 75 μM concentration decreased root growth by 40% compared with wild type Col-0 as a control. Ethylene biosynthesis increased in response to CdCl2 treatment. The length of primary root and root tip in ein2-5 and ein3-1eil1-1 decreased compared with wild type after CdCl2 treatment, suggesting that ethylene play a role in root system response to Cd stress...
2017: Frontiers in Plant Science
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