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https://www.readbyqxmd.com/read/29681752/molecular-aspects-of-flower-senescence-and-strategies-to-improve-flower-longevity
#1
REVIEW
Kenichi Shibuya
Flower longevity is one of the most important traits for ornamental plants. Ethylene plays a crucial role in flower senescence in some plant species. In several species that show ethylene-dependent flower senescence, genetic modification targeting genes for ethylene biosynthesis or signaling has improved flower longevity. Although little is known about regulatory mechanisms of petal senescence in flowers that show ethylene-independent senescence, a recent study of Japanese morning glory revealed that a NAC transcription factor, EPHEMERAL1 (EPH1), is a key regulator in ethylene-independent petal senescence...
January 2018: Breeding Science
https://www.readbyqxmd.com/read/29562933/microbial-modulation-of-plant-ethylene-signaling-ecological-and-evolutionary-consequences
#2
REVIEW
Mohammadhossein Ravanbakhsh, Rashmi Sasidharan, Laurentius A C J Voesenek, George A Kowalchuk, Alexandre Jousset
The plant hormone ethylene is one of the central regulators of plant development and stress resistance. Optimal ethylene signaling is essential for plant fitness and is under strong selection pressure. Plants upregulate ethylene production in response to stress, and this hormone triggers defense mechanisms. Due to the pleiotropic effects of ethylene, adjusting stress responses to maximize resistance, while minimizing costs, is a central determinant of plant fitness. Ethylene signaling is influenced by the plant-associated microbiome...
March 21, 2018: Microbiome
https://www.readbyqxmd.com/read/29554117/ethylene-induced-plant-stress-tolerance-by-enterobacter-sp-sa187-is-mediated-by-2-keto-4-methylthiobutyric-acid-production
#3
Axel de Zélicourt, Lukas Synek, Maged M Saad, Hanin Alzubaidy, Rewaa Jalal, Yakun Xie, Cristina Andrés-Barrao, Eleonora Rolli, Florence Guerard, Kiruthiga G Mariappan, Ihsanullah Daur, Jean Colcombet, Moussa Benhamed, Thomas Depaepe, Dominique Van Der Straeten, Heribert Hirt
Several plant species require microbial associations for survival under different biotic and abiotic stresses. In this study, we show that Enterobacter sp. SA187, a desert plant endophytic bacterium, enhances yield of the crop plant alfalfa under field conditions as well as growth of the model plant Arabidopsis thaliana in vitro, revealing a high potential of SA187 as a biological solution for improving crop production. Studying the SA187 interaction with Arabidopsis, we uncovered a number of mechanisms related to the beneficial association of SA187 with plants...
March 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29516180/improvement-of-cupriavidus-taiwanensis-nodulation-and-plant-growth-promoting-abilities-by-the-expression-of-an-exogenous-acc-deaminase-gene
#4
Francisco X Nascimento, Maria J Tavares, Bernard R Glick, Márcio J Rossi
Several rhizobial strains possess the ability to modulate leguminous plants ethylene levels by producing the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase. While the effect of ACC deaminase has been studied in several rhizobia belonging to the Alphaproteobacteria class, not much is understood about its impact in the nodulation abilities of rhizobia belonging to the Betaproteobacteria class, which are common symbionts of Mimosa species. In this work, we report the impact of ACC deaminase production by the Betaproteobacterium, Cupriavidus taiwanensis STM894, and its role in the nodulation of Mimosa pudica...
March 7, 2018: Current Microbiology
https://www.readbyqxmd.com/read/29497085/recognition-motif-and-mechanism-of-ripening-inhibitory-peptides-in-plant-hormone-receptor-etr1
#5
Dalibor Milić, Markus Dick, Daniel Mulnaes, Christopher Pfleger, Anna Kinnen, Holger Gohlke, Georg Groth
Synthetic peptides derived from ethylene-insensitive protein 2 (EIN2), a central regulator of ethylene signalling, were recently shown to delay fruit ripening by interrupting protein-protein interactions in the ethylene signalling pathway. Here, we show that the inhibitory peptide NOP-1 binds to the GAF domain of ETR1 - the prototype of the plant ethylene receptor family. Site-directed mutagenesis and computational studies reveal the peptide interaction site and a plausible molecular mechanism for the ripening inhibition...
March 1, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29476114/alleviation-of-drought-stress-in-pulse-crops-with-acc-deaminase-producing-rhizobacteria-isolated-from-acidic-soil-of-northeast-india
#6
Juthika Saikia, Rupak K Sarma, Rajashree Dhandia, Archana Yadav, Rupjyoti Bharali, Vijai K Gupta, Ratul Saikia
The agricultural crops are often affected by the scarcity of fresh water. Seasonal drought is a major constraint on Northeast Indian agriculture. Almost 80% of the agricultural land in this region is acidic and facing severe drought during the winter period. Apart from classical breeding and transgenic approaches, the application of plant-growth-promoting bacteria (PGPB) is an alternative strategy for improving plant fitness under stressful conditions. The 1-aminocyclopropane-1-carboxylate (ACC) deaminase-producing PGPB offer drought stress tolerance by regulating plant ethylene levels...
February 23, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29447189/drought-response-of-mucuna-pruriens-l-dc-inoculated-with-acc-deaminase-and-iaa-producing-rhizobacteria
#7
Aansa Rukya Saleem, Cecilia Brunetti, Azeem Khalid, Gianni Della Rocca, Aida Raio, Giovanni Emiliani, Anna De Carlo, Tariq Mahmood, Mauro Centritto
Drought is one of the major constraints limiting agricultural production worldwide and is expected to increase in the future. Limited water availability causes significant effects to plant growth and physiology. Plants have evolved different traits to mitigate the stress imposed by drought. The presence of plant growth-promoting rhizobacteria (PGPR) could play an important role in improving plant performances and productivity under drought. These beneficial microorganisms colonize the rhizosphere of plants and increase drought tolerance by lowering ethylene formation...
2018: PloS One
https://www.readbyqxmd.com/read/29183329/surface-display-of-acc-deaminase-on-endophytic-enterobacteriaceae-strains-to-increase-saline-resistance-of-host-rice-sprouts-by-regulating-plant-ethylene-synthesis
#8
Yupei Liu, Lixiang Cao, Hongming Tan, Renduo Zhang
BACKGROUND: Most endophytic bacteria in consortia, which provide robust and broad metabolic capacity, are attractive for applications in plant metabolic engineering. The aim of this study was to investigate the effects of engineered endophytic bacterial strains on rice sprout ethylene level and growth under saline stress. A protocol was developed to synthesize engineered strains by expressing bacterial 1-aminocyclopropane-1-carboxylate (ACC) deaminase gene on cells of endophytic Enterobacter sp...
November 28, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28993735/comparative-physiological-biochemical-and-genetic-responses-to-prolonged-waterlogging-stress-in-okra-and-maize-given-exogenous-ethylene-priming
#9
Emuejevoke Vwioko, Onyekachukwu Adinkwu, Mohamed A El-Esawi
Waterlogging is an environmental challenge affecting crops worldwide. Ethylene induces the expression of genes linked to important agronomic traits under waterlogged conditions. The ability of okra (Abelmoschus esculentus L. Moench.) and maize (Zea mays L.) given exogenous ethylene priming to tolerate prolonged waterlogged conditions was investigated in this study. The investigation was carried out as field experiments using 3 week-old plants grouped into four treatments; control, waterlogged plants, ethylene priming of plants before waterlogging, and ethylene priming of plants after waterlogging...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28928762/novel-protein-protein-inhibitor-based-approach-to-control-plant-ethylene-responses-synthetic-peptides-for-ripening-control
#10
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/28735369/ethylene-sensitivity-and-relative-air-humidity-regulate-root-hydraulic-properties-in-tomato-plants
#11
Monica Calvo-Polanco, Pablo Ibort, Sonia Molina, Juan Manuel Ruiz-Lozano, Angel María Zamarreño, Jose María García-Mina, Ricardo Aroca
The effect of ethylene and its precursor ACC on root hydraulic properties, including aquaporin expression and abundance, is modulated by relative air humidity and plant sensitivity to ethylene. Relative air humidity (RH) is a main factor contributing to water balance in plants. Ethylene (ET) is known to be involved in the regulation of root water uptake and stomatal opening although its role on plant water balance under different RH is not very well understood. We studied, at the physiological, hormonal and molecular levels (aquaporins expression, abundance and phosphorylation state), the plant responses to exogenous 1-aminocyclopropane-1-carboxylic acid (ACC; precursor of ET) and 2-aminoisobutyric acid (AIB; inhibitor of ET biosynthesis), after 24 h of application to the roots of tomato wild type (WT) plants and its ET-insensitive never ripe (nr) mutant, at two RH levels: regular (50%) and close to saturation RH...
November 2017: Planta
https://www.readbyqxmd.com/read/28420789/structural-and-stereoelectronic-insights-into-oxygenase-catalyzed-formation-of-ethylene-from-2-oxoglutarate
#12
Zhihong Zhang, Tristan J Smart, Hwanho Choi, Florence Hardy, Christopher T Lohans, Martine I Abboud, Melodie S W Richardson, Robert S Paton, Michael A McDonough, Christopher J Schofield
Ethylene is important in industry and biological signaling. In plants, ethylene is produced by oxidation of 1-aminocyclopropane-1-carboxylic acid, as catalyzed by 1-aminocyclopropane-1-carboxylic acid oxidase. Bacteria catalyze ethylene production, but via the four-electron oxidation of 2-oxoglutarate to give ethylene in an arginine-dependent reaction. Crystallographic and biochemical studies on the Pseudomonas syringae ethylene-forming enzyme reveal a branched mechanism. In one branch, an apparently typical 2-oxoglutarate oxygenase reaction to give succinate, carbon dioxide, and sometimes pyrroline-5-carboxylate occurs...
May 2, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28293841/analysis-of-ethylene-receptors-ethylene-binding-assays
#13
Brad M Binder, G Eric Schaller
Plant ethylene receptors bind ethylene with high affinity. Most of the characterization of ethylene binding to the receptors has been carried out using a radioligand-binding assay on functional receptors expressed in yeast. In this chapter, we describe methods for expressing ethylene receptors in yeast and conducting ethylene-binding assays on intact yeast and yeast membranes. The ethylene-binding assays can be modified to analyze ethylene binding to intact plants and other organisms as well as membranes isolated from any biological source...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28293836/plant-ethylene-detection-using-laser-based-photo-acoustic-spectroscopy
#14
Bram Van de Poel, Dominique Van Der Straeten
Analytical detection of the plant hormone ethylene is an important prerequisite in physiological studies. Real-time and super sensitive detection of trace amounts of ethylene gas is possible using laser-based photo-acoustic spectroscopy. This Chapter will provide some background on the technique, compare it with conventional gas chromatography, and provide a detailed user-friendly hand-out on how to operate the machine and the software. In addition, this Chapter provides some tips and tricks for designing and performing physiological experiments suited for ethylene detection with laser-based photo-acoustic spectroscopy...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28194158/role-and-regulation-of-acc-deaminase-gene-in-sinorhizobium-meliloti-is-it-a-symbiotic-rhizospheric-or-endophytic-gene
#15
Alice Checcucci, Elisa Azzarello, Marco Bazzicalupo, Anna De Carlo, Giovanni Emiliani, Stefano Mancuso, Giulia Spini, Carlo Viti, Alessio Mengoni
Plant-associated bacteria exhibit a number of different strategies and specific genes allow bacteria to communicate and metabolically interact with plant tissues. Among the genes found in the genomes of plant-associated bacteria, the gene encoding the enzyme 1-aminocyclopropane-1-carboxylate (ACC) deaminase (acdS) is one of the most diffused. This gene is supposed to be involved in the cleaving of plant-produced ACC, the precursor of the plant stress-hormone ethylene toning down the plant response to infection...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/27994186/lcmkk-a-mapk-kinase-from-lycium-chinense-confers-cadmium-tolerance-in-transgenic-tobacco-by-transcriptional-upregulation-of-ethylene-responsive-transcription-factor-gene
#16
Chunfeng Guan, Jing Ji, Xiaozhou Li, Chao Jin, Gang Wang
Cadmium (Cd) is a highly toxic element to plants. Ethylene is an important phytohormone in the regulation of plant growth, development and stress response. Mitogen-activated protein kinase (MAPK) activation has been observed in plants exposed to Cd stress and was suggested to be involved in ethylene biosynthesis. We hypothesized that there may be a link between MAPK cascades and ethylene signalling in Cd-stressed plants. To test this hypothesis, the expression of LcMKK, LchERF and LcGSH1 genes, endogenous ethylene accumulation, GSH content and Cd concentration in Lycium chinense with or without Cd stress treatment were studied...
December 2016: Journal of Genetics
https://www.readbyqxmd.com/read/27486797/nmr-study-reveals-the-receiver-domain-of-arabidopsis-ethylene-response1-ethylene-receptor-as-an-atypical-type-response-regulator
#17
Yi-Lin Hung, Ingjye Jiang, Yi-Zong Lee, Chi-Kuang Wen, Shih-Che Sue
The gaseous plant hormone ethylene, recognized by plant ethylene receptors, plays a pivotal role in various aspects of plant growth and development. ETHYLENE RESPONSE1 (ETR1) is an ethylene receptor isolated from Arabidopsis and has a structure characteristic of prokaryotic two-component histidine kinase (HK) and receiver domain (RD), where the RD structurally resembles bacteria response regulators (RRs). The ETR1 HK domain has autophosphorylation activity, and little is known if the HK can transfer the phosphoryl group to the RD for receptor signaling...
2016: PloS One
https://www.readbyqxmd.com/read/27435661/ethylene-response-factor-terf1-regulated-by-ethylene-insensitive3-like-factors-functions-in-reactive-oxygen-species-ros-scavenging-in-tobacco-nicotiana-tabacum-l
#18
Hongbo Zhang, Ang Li, Zhijin Zhang, Zejun Huang, Pingli Lu, Dingyu Zhang, Xinmin Liu, Zhong-Feng Zhang, Rongfeng Huang
The phytohormone ethylene plays a crucial role in the production and accumulation of reactive oxygen species (ROS) in plants under stress conditions. Ethylene response factors (ERFs) are important ethylene-signaling regulators functioning in plant defense responses against biotic and abiotic stresses. However, the roles of ERFs during plant adapting to ROS stress have not yet been well documented. Our studies previously reported that a tomato ERF transcription factor TERF1 functions in the regulation of plant ethylene responses and stress tolerance...
2016: Scientific Reports
https://www.readbyqxmd.com/read/26657304/possible-role-of-1-aminocyclopropane-1-carboxylate-acc-deaminase-activity-of-sinorhizobium-sp-bl3-on-symbiosis-with-mung-bean-and-determinate-nodule-senescence
#19
Panlada Tittabutr, Sudarat Sripakdi, Nantakorn Boonkerd, Waraporn Tanthanuch, Kiwamu Minamisawa, Neung Teaumroong
Sinorhizobium sp. BL3 forms symbiotic interactions with mung bean (Vigna radiata) and contains lrpL-acdS genes, which encode the 1-aminocyclopropane-1-carboxylate (ACC) deaminase enzyme that cleaves ACC, a precursor of plant ethylene synthesis. Since ethylene interferes with nodule formation in some legumes and plays a role in senescence in plant cells, BL3-enhancing ACC deaminase activity (BL3(+)) and defective mutant (BL3(-)) strains were constructed in order to investigate the effects of this enzyme on symbiosis and nodule senescence...
2015: Microbes and Environments
https://www.readbyqxmd.com/read/26640476/the-role-of-ethylene-in-plants-under-salinity-stress
#20
REVIEW
Jian-Jun Tao, Hao-Wei Chen, Biao Ma, Wan-Ke Zhang, Shou-Yi Chen, Jin-Song Zhang
Although the roles of ethylene in plant response to salinity and other stresses have been extensively studied, there are still some obscure points left to be clarified. Generally, in Arabidopsis and many other terrestrial plants, ethylene signaling is indispensable for plant rapid response and tolerance to salinity stress. However, a few studies showed that functional knock-out of some ACSs increased plant salinity-tolerance, while overexpression of them caused more sensitivity. This seems to be contradictory to the known opinion that ethylene plays positive roles in salinity response...
2015: Frontiers in Plant Science
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