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Histidine kinase MHZ1/OsHK1 interacts with ethylene receptors to regulate root growth in rice. Nat Commun 2020; 11:518. [PMID: 31980616 PMCID: PMC6981129 DOI: 10.1038/s41467-020-14313-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 12/27/2019] [Indexed: 02/02/2023] Open
Abstract
Ethylene plays essential roles during adaptive responses to water-saturating environments in rice, but knowledge of its signaling mechanism remains limited. Here, through an analysis of a rice ethylene-response mutant mhz1, we show that MHZ1 positively modulates root ethylene responses. MHZ1 encodes the rice histidine kinase OsHK1. MHZ1/OsHK1 is autophosphorylated at a conserved histidine residue and can transfer the phosphoryl signal to the response regulator OsRR21 via the phosphotransfer proteins OsAHP1/2. This phosphorelay pathway is required for root ethylene responses. Ethylene receptor OsERS2, via its GAF domain, physically interacts with MHZ1/OsHK1 and inhibits its kinase activity. Genetic analyses suggest that MHZ1/OsHK1 acts at the level of ethylene perception and works together with the OsEIN2-mediated pathway to regulate root growth. Our results suggest that MHZ1/OsHK1 mediates the ethylene response partially independently of OsEIN2, and is directly inhibited by ethylene receptors, thus revealing mechanistic details of ethylene signaling for root growth regulation.
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García A, Aguado E, Martínez C, Loska D, Beltrán S, Valenzuela JL, Garrido D, Jamilena M. The ethylene receptors CpETR1A and CpETR2B cooperate in the control of sex determination in Cucurbita pepo. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:154-167. [PMID: 31562498 PMCID: PMC6913735 DOI: 10.1093/jxb/erz417] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 09/10/2019] [Indexed: 05/04/2023]
Abstract
High-throughput screening of an ethyl methanesulfonate-generated mutant collection of Cucurbita pepo using the ethylene triple-response test resulted in the identification of two semi-dominant ethylene-insensitive mutants: etr1a and etr2b. Both mutations altered sex determination mechanisms, promoting conversion of female into bisexual or hermaphrodite flowers, and monoecy into andromonoecy, thereby delaying the transition to female flowering and reducing the number of pistillate flowers per plant. The mutations also altered the growth rate and maturity of petals and carpels in pistillate flowers, lengthening the time required for flowers to reach anthesis, as well as stimulating the growth rate of ovaries and the parthenocarpic development of fruits. Whole-genome sequencing allowed identification of the causal mutation of the phenotypes as two missense mutations in the coding region of CpETR1A and CpETR2B, each one corresponding to one of the duplicates of ethylene receptor genes highly homologous to Arabidopsis ETR1 and ETR2. The phenotypes of homozygous and heterozygous single- and double-mutant plants indicated that the two ethylene receptors cooperate in the control of the ethylene response. The level of ethylene insensitivity, which was determined by the strength of each mutant allele and the dose of wild-type and mutant etr1a and etr2b alleles, correlated with the degree of phenotypic changes in the mutants.
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Affiliation(s)
- Alicia García
- Department of Biology and Geology, Research Centers CIAIMBITAL and CeiA3, University of Almería, Almería, Spain
| | - Encarnación Aguado
- Department of Biology and Geology, Research Centers CIAIMBITAL and CeiA3, University of Almería, Almería, Spain
| | - Cecilia Martínez
- Department of Biology and Geology, Research Centers CIAIMBITAL and CeiA3, University of Almería, Almería, Spain
| | - Damian Loska
- Centro Nacional de Análisis Genómico (CNAG), Barcelona, Spain
| | - Sergi Beltrán
- Centro Nacional de Análisis Genómico (CNAG), Barcelona, Spain
| | - Juan Luis Valenzuela
- Department of Biology and Geology, Research Centers CIAIMBITAL and CeiA3, University of Almería, Almería, Spain
| | - Dolores Garrido
- Department of Plant Physiology, University of Granada, Granada, Spain
| | - Manuel Jamilena
- Department of Biology and Geology, Research Centers CIAIMBITAL and CeiA3, University of Almería, Almería, Spain
- Corresponding author:
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53
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New Insights into Multistep-Phosphorelay (MSP)/ Two-Component System (TCS) Regulation: Are Plants and Bacteria that Different? PLANTS 2019; 8:plants8120590. [PMID: 31835810 PMCID: PMC6963811 DOI: 10.3390/plants8120590] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 11/27/2019] [Accepted: 12/07/2019] [Indexed: 12/12/2022]
Abstract
The Arabidopsis multistep-phosphorelay (MSP) is a signaling mechanism based on a phosphorelay that involves three different types of proteins: Histidine kinases, phosphotransfer proteins, and response regulators. Its bacterial equivalent, the two-component system (TCS), is the most predominant device for signal transduction in prokaryotes. The TCS has been extensively studied and is thus generally well-understood. In contrast, the MSP in plants was first described in 1993. Although great advances have been made, MSP is far from being completely comprehended. Focusing on the model organism Arabidopsis thaliana, this review summarized recent studies that have revealed many similarities with bacterial TCSs regarding how TCS/MSP signaling is regulated by protein phosphorylation and dephosphorylation, protein degradation, and dimerization. Thus, comparison with better-understood bacterial systems might be relevant for an improved study of the Arabidopsis MSP.
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54
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Winterhagen P, Hagemann MH, Wünsche JN. Different regulatory modules of two mango ERS1 promoters modulate specific gene expression in response to phytohormones in transgenic model plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2019; 289:110269. [PMID: 31623779 DOI: 10.1016/j.plantsci.2019.110269] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 09/10/2019] [Accepted: 09/11/2019] [Indexed: 06/10/2023]
Abstract
Ethylene is a key element of plant physiology, thus ethylene research is important for both, fundamental research and agriculture. Previous work on ethylene receptors focused on expression level and protein interaction, but knowledge on regulation of gene transcription is scarce. Promoters of mango ethylene receptor genes (pMiERS1a, pMiERS1b) were analysed particularly regarding responsiveness to hormones. The promoter sequences reveal some variation and they were characterized by identifying functional regulatory candidate modules via truncated-promoter approach. Based on ectopic gene expression studies in transgenic Arabidopsis and Nicotiana it is demonstrated that both promoters are positively responsive to ethylene. For pMiERS1a the AHBP/DOFF1 module is linked to ethylene responsiveness, while for pMiERS1b it is the module MYBL/OPAQ1. A negative gene regulation in response to abscisic acid (ABA) is linked to MYBL/DOFF2. A positive response to indole-3-acetic acid (IAA) was found for GTBX/MYCL1, containing the motifs IBOX/IDDF/TEFB, which are present in this combination only in pMiERS1b, but not in pMiERS1a. Conclusively, the general response of the ethylene receptor genes is conserved, but similar regulation can be linked to different modules. Further, a minor variation in a transcription factor binding site (TFBS) motif within an overall conserved module type can lead to a different expression.
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Affiliation(s)
- Patrick Winterhagen
- University of Hohenheim, Institute of Crop Science, Section Crop Physiology of Specialty Crops, Stuttgart, Germany.
| | - Michael H Hagemann
- University of Hohenheim, Institute of Crop Science, Section Crop Physiology of Specialty Crops, Stuttgart, Germany
| | - Jens N Wünsche
- University of Hohenheim, Institute of Crop Science, Section Crop Physiology of Specialty Crops, Stuttgart, Germany
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55
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Gazara RK, de Oliveira EAG, Rodrigues BC, Nunes da Fonseca R, Oliveira AEA, Venancio TM. Transcriptional landscape of soybean (Glycine max) embryonic axes during germination in the presence of paclobutrazol, a gibberellin biosynthesis inhibitor. Sci Rep 2019; 9:9601. [PMID: 31270425 PMCID: PMC6610145 DOI: 10.1038/s41598-019-45898-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 06/19/2019] [Indexed: 12/13/2022] Open
Abstract
Gibberellins (GA) are key positive regulators of seed germination. Although the GA effects on seed germination have been studied in a number of species, little is known about the transcriptional reprogramming modulated by GA during this phase in species other than Arabidopsis thaliana. Here we report the transcriptome analysis of soybean embryonic axes during germination in the presence of paclobutrazol (PBZ), a GA biosynthesis inhibitor. We found a number of differentially expressed cell wall metabolism genes, supporting their roles in cell expansion during germination. Several genes involved in the biosynthesis and signaling of other phytohormones were also modulated, indicating an intensive hormonal crosstalk at the embryonic axis. We have also found 26 photosynthesis genes that are up-regulated by PBZ at 24 hours after imbibition (HAI) and down-regulated at 36 HAI, which led us to suggest that this is part of a strategy to implement an autotrophic growth program in the absence of GA-driven mobilization of reserves. Finally, 30 transcription factors (mostly from the MYB, bHLH, and bZIP families) were down-regulated by PBZ and are likely downstream GA targets that will drive transcriptional changes during germination.
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Affiliation(s)
- Rajesh K Gazara
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Brazil
| | - Eduardo A G de Oliveira
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Brazil
| | - Bruno C Rodrigues
- Laboratório Integrado de Ciências Morfofuncionais, Núcleo em Ecologia e Desenvolvimento SócioAmbiental de Macaé (NUPEM), Macaé, Brazil
| | - Rodrigo Nunes da Fonseca
- Laboratório Integrado de Ciências Morfofuncionais, Núcleo em Ecologia e Desenvolvimento SócioAmbiental de Macaé (NUPEM), Macaé, Brazil
| | - Antônia Elenir A Oliveira
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Brazil
| | - Thiago M Venancio
- Laboratório de Química e Função de Proteínas e Peptídeos, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, Brazil.
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56
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Debbarma J, Sarki YN, Saikia B, Boruah HPD, Singha DL, Chikkaputtaiah C. Ethylene Response Factor (ERF) Family Proteins in Abiotic Stresses and CRISPR-Cas9 Genome Editing of ERFs for Multiple Abiotic Stress Tolerance in Crop Plants: A Review. Mol Biotechnol 2019; 61:153-172. [PMID: 30600447 DOI: 10.1007/s12033-018-0144-x] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Abiotic stresses such as extreme heat, cold, drought, and salt have brought alteration in plant growth and development, threatening crop yield and quality leading to global food insecurity. Many factors plays crucial role in regulating various plant growth and developmental processes during abiotic stresses. Ethylene response factors (ERFs) are AP2/ERF superfamily proteins belonging to the largest family of transcription factors known to participate during multiple abiotic stress tolerance such as salt, drought, heat, and cold with well-conserved DNA-binding domain. Several extensive studies were conducted on many ERF family proteins in plant species through over-expression and transgenics. However, studies on ERF family proteins with negative regulatory functions are very few. In this review article, we have summarized the mechanism and role of recently studied AP2/ERF-type transcription factors in different abiotic stress responses. We have comprehensively discussed the application of advanced ground-breaking genome engineering tool, CRISPR/Cas9, to edit specific ERFs. We have also highlighted our on-going and published R&D efforts on multiplex CRISPR/Cas9 genome editing of negative regulatory genes for multiple abiotic stress responses in plant and crop models. The overall aim of this review is to highlight the importance of CRISPR/Cas9 and ERFs in developing sustainable multiple abiotic stress tolerance in crop plants.
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Affiliation(s)
- Johni Debbarma
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-NEIST, Jorhat, Assam, 785006, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST, Jorhat, Assam, India
| | - Yogita N Sarki
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-NEIST, Jorhat, Assam, 785006, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST, Jorhat, Assam, India
| | - Banashree Saikia
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-NEIST, Jorhat, Assam, 785006, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST, Jorhat, Assam, India
| | - Hari Prasanna Deka Boruah
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-NEIST, Jorhat, Assam, 785006, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST, Jorhat, Assam, India
| | - Dhanawantari L Singha
- Department of Agricultural Biotechnology, Assam Agriculture University, Jorhat, 785013, Assam, India.
| | - Channakeshavaiah Chikkaputtaiah
- Biotechnology Group, Biological Sciences and Technology Division, CSIR-NEIST, Jorhat, Assam, 785006, India. .,Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST, Jorhat, Assam, India.
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57
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Li X, Chen T, Li Y, Wang Z, Cao H, Chen F, Li Y, Soppe WJJ, Li W, Liu Y. ETR1/RDO3 Regulates Seed Dormancy by Relieving the Inhibitory Effect of the ERF12-TPL Complex on DELAY OF GERMINATION1 Expression. THE PLANT CELL 2019; 31:832-847. [PMID: 30837295 PMCID: PMC6501604 DOI: 10.1105/tpc.18.00449] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 01/31/2019] [Accepted: 03/02/2019] [Indexed: 05/18/2023]
Abstract
The control of seed dormancy by ethylene has been well studied, but the underlying molecular mechanisms are not fully understood. Here, we report the characterization of the Arabidopsis (Arabidopsis thaliana) mutant reduced dormancy 3 (rdo3) and the cloning of the underlying gene. We demonstrate that rdo3 is a loss-of-function mutant of the ethylene receptor ETHYLENE RESPONSE1 (ETR1). ETR1 controls seed dormancy partially through the DELAY OF GERMINATION1 (DOG1) pathway. Molecular and genetic analyses demonstrated that ETHYLENE RESPONSE FACTOR12 (ERF12) is involved in the regulation of seed dormancy downstream of ETR1. ERF12 interacts with TOPLESS (TPL) and genetically requires TPL to function. ERF12 and TPL repress the expression of DOG1 by occupying its promoter. Thus, we identified the dormancy pathway ETR1-ERF12-TPL-DOG1 and provide mechanistic insights into the regulation of seed dormancy by linking the ethylene and DOG1 pathways.
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Affiliation(s)
- Xiaoying Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Tiantian Chen
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yu Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi Wang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- State Key Laboratory of Cotton Biology, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, China
| | - Hong Cao
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Fengying Chen
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
| | - Yong Li
- Institute of Genetic Epidemiology, University of Freiburg, 79106 Freiburg, Germany
| | - Wim J J Soppe
- Rijk Zwaan, De Lier 2678 ZG, The Netherlands
- Department of Plant Breeding and Genetics, Max Planck Institute for Plant Breeding Research, 50829 Cologne, Germany
| | - Wenlong Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Science and Technology Daily, Beijing, China
| | - Yongxiu Liu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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58
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Singh P, Singh AP, Sane AP. Differential and reciprocal regulation of ethylene pathway genes regulates petal abscission in fragrant and non-fragrant roses. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2019; 280:330-339. [PMID: 30824012 DOI: 10.1016/j.plantsci.2018.12.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 12/12/2018] [Accepted: 12/14/2018] [Indexed: 06/09/2023]
Abstract
The fragrant rose, Rosa bourboniana, is highly sensitive to ethylene and shows rapid petal abscission (within 16-18 h) while the non-fragrant hybrid rose, R. hybrida, shows delayed abscission (50-52 h) due to reduced ethylene sensitivity. To understand the molecular basis governing these differences, all components of the ethylene pathway (biosynthesis/ receptor/signalling) were studied for expression during abscission. Transcript accumulation of most ethylene biosynthesis genes (ACS/ACO families) increased rapidly in petal abscission zones of R. bourboniana within 4-8 h of ethylene treatment. The expression of most receptor and signalling genes encoding CTRs, EIN2 and EIN3/EIL homologues also followed similar kinetics. Under natural field conditions where abscission takes longer, there was a temporal delay in transcript accumulation of most ethylene pathway genes while some biosynthesis genes (showing reduced ethylene sensitivity) were more strongly up-regulated by abscission cues. In contrast, in R. hybrida where even ethylene-induced abscission is considerably delayed, transcript accumulation of most ethylene biosynthesis and signalling genes was, surprisingly, reduced by ethylene and showed an opposite regulation compared to R. bourboniana. The results suggest that differential and reciprocal regulation of ethylene pathway is one of the major reasons for differences in petal abscission and vase-life between Rosa bourboniana and R. hybrida.
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Affiliation(s)
- Priya Singh
- Plant Gene Expression Lab, CSIR-National Botanical Research Institute (CSIR), Lucknow, 226001, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Amar Pal Singh
- Plant Gene Expression Lab, CSIR-National Botanical Research Institute (CSIR), Lucknow, 226001, India
| | - Aniruddha P Sane
- Plant Gene Expression Lab, CSIR-National Botanical Research Institute (CSIR), Lucknow, 226001, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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59
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Yin J, Zhang X, Zhang G, Wen Y, Liang G, Chen X. Aminocyclopropane-1-carboxylic acid is a key regulator of guard mother cell terminal division in Arabidopsis thaliana. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:897-908. [PMID: 30462272 PMCID: PMC6363092 DOI: 10.1093/jxb/ery413] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 11/14/2018] [Indexed: 05/05/2023]
Abstract
Stomata have a critical function in the exchange of gases and water vapor between plants and their environment. Stomatal development is under the rigorous control of many regulators. The last step of development is the terminal division of guard mother cells (GMC) into two guard cells (GC). It is still unclear how the symmetric division of GMCs is regulated. Here, we show that the ethylene precursor aminocyclopropane-1-carboxylic acid (ACC) is required for the symmetric division of GMCs into GCs in Arabidopsis. Exogenous application of the ACC biosynthesis inhibitor aminoethoxyvinylglycine (AVG) induced the formation of single guard cells (SGCs). Correspondingly, an acs octuple-mutant with extremely low endogenous ACC also developed SGCs, and exogenous ACC dramatically decreased the number of SGCs in this mutant whereas exogenous ethephon (which is gradually converted into ethylene) had no effect. Furthermore, neither blocking of endogenous ethylene synthesis nor disruption of ethylene signaling transduction could induce the production of SGCs. Further investigation indicated that ACC promoted the division of GMCs in fama-1 and flp-1myb88 mutants whereas AVG inhibited it. Moreover, ACC positively regulated the expression of CDKB1;1 and CYCA2;3 in the fama-1 and flp-1myb88 mutants. The SGC number was not affected by ACC or AVG in cdkb1;11;2 and cyca2;234 mutants. Taken together, the results demonstrate that ACC itself, but not ethylene, positively modulates the symmetric division of GMCs in a manner that is dependent on CDKB1s and CYCA2s.
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Affiliation(s)
- Jiao Yin
- School of Life Sciences, Yunnan University, Kunming, Yunnan, China
| | - Xiaoqian Zhang
- School of Life Sciences, Yunnan University, Kunming, Yunnan, China
| | - Gensong Zhang
- School of Life Sciences, Yunnan University, Kunming, Yunnan, China
| | - Yuanyuan Wen
- School of Life Sciences, Yunnan University, Kunming, Yunnan, China
| | - Gang Liang
- CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, Yunnan, China
- Correspondence: or
| | - Xiaolan Chen
- School of Life Sciences, Yunnan University, Kunming, Yunnan, China
- Correspondence: or
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60
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Allen CJ, Lacey RF, Binder Bickford AB, Beshears CP, Gilmartin CJ, Binder BM. Cyanobacteria Respond to Low Levels of Ethylene. FRONTIERS IN PLANT SCIENCE 2019; 10:950. [PMID: 31417582 PMCID: PMC6682694 DOI: 10.3389/fpls.2019.00950] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 07/08/2019] [Indexed: 05/07/2023]
Abstract
Ethylene is a gas that has long been known to act as a plant hormone. We recently showed that a cyanobacterium, Synechocystis sp. PCC 6803 (Synechocystis) contains an ethylene receptor (SynEtr1) that regulates cell surface and extracellular components leading to altered phototaxis and biofilm formation. To determine whether other cyanobacteria respond to ethylene, we examined the effects of exogenous ethylene on phototaxis of the filamentous cyanobacterium, Geitlerinema sp. PCC 7105 (Geitlerinema). A search of the Geitlerinema genome suggests that two genes encode proteins that contain an ethylene binding domain and Geitlerinema cells have previously been shown to bind ethylene. We call these genes GeiEtr1 and GeiEtr2 and show that in air both are expressed. Treatment with ethylene decreases the abundance of GeiEtr1 transcripts. Treatment of Geitlerinema with 1000 nL L-1 ethylene affected the phototaxis response to white light as well as monochromatic red light, but not blue or green light. This is in contrast to Synechocystis where we previously found ethylene affected phototaxis to all three colors. We also demonstrate that application of ethylene down to 8 nL L-1 stimulates phototaxis of both cyanobacteria as well as biofilm formation of Synechocystis. We formerly demonstrated that the transcript levels of slr1214 and CsiR1 in Synechocystis are reduced by treatment with 1000 nL L-1 ethylene. Here we show that application of ethylene down to 1 nL L-1 causes a reduction in CsiR1 abundance. This is below the threshold for most ethylene responses documented in plants. By contrast, slr1214 is unaffected by this low level of ethylene and only shows a reduction in transcript abundance at the highest ethylene level used. Thus, cyanobacteria are very sensitive to ethylene. However, the dose-binding characteristics of ethylene binding to Geitlerinema and Synechocystis cells as well as to the ethylene binding domain of SynEtr1 heterologously expressed in yeast, are similar to what has been reported for plants and exogenously expressed ethylene receptors from plants. These data are consistent with a model where signal amplification is occurring at the level of the receptors.
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Affiliation(s)
- Cidney J. Allen
- Department of Biochemistry & Cellular and Molecular Biology, The University of Tennessee, Knoxville, Knoxville, TN, United States
| | - Randy F. Lacey
- Department of Biochemistry & Cellular and Molecular Biology, The University of Tennessee, Knoxville, Knoxville, TN, United States
| | | | - C. Payton Beshears
- Department of Biochemistry & Cellular and Molecular Biology, The University of Tennessee, Knoxville, Knoxville, TN, United States
| | | | - Brad M. Binder
- Department of Biochemistry & Cellular and Molecular Biology, The University of Tennessee, Knoxville, Knoxville, TN, United States
- *Correspondence: Brad M. Binder,
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61
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Qin H, He L, Huang R. The Coordination of Ethylene and Other Hormones in Primary Root Development. FRONTIERS IN PLANT SCIENCE 2019; 10:874. [PMID: 31354757 PMCID: PMC6635467 DOI: 10.3389/fpls.2019.00874] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 06/19/2019] [Indexed: 05/11/2023]
Abstract
The primary root is the basic component of root systems, initiates during embryogenesis and develops shortly after germination, and plays a key role in early seedling growth and survival. The phytohormone ethylene shows significant inhibition of the growth of primary roots. Recent findings have revealed that the inhibition of ethylene in primary root elongation is mediated via interactions with phytohormones, such as auxin, abscisic acid, gibberellin, cytokinins, jasmonic acid, and brassinosteroids. Considering that Arabidopsis and rice are the model plants of dicots and monocots, as well as the fact that hormonal crosstalk in primary root growth has been extensively investigated in Arabidopsis and rice, a better understanding of the mechanisms in Arabidopsis and rice will increase potential applications in other species. Therefore, we focus our interest on the emerging studies in the research of ethylene and hormone crosstalk in primary root development in Arabidopsis and rice.
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Affiliation(s)
- Hua Qin
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
- National Key Facility of Crop Gene Resources and Genetic Improvement, Beijing, China
| | - Lina He
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
| | - Rongfeng Huang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
- National Key Facility of Crop Gene Resources and Genetic Improvement, Beijing, China
- *Correspondence: Rongfeng Huang,
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62
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Harkey AF, Yoon GM, Seo DH, DeLong A, Muday GK. Light Modulates Ethylene Synthesis, Signaling, and Downstream Transcriptional Networks to Control Plant Development. FRONTIERS IN PLANT SCIENCE 2019; 10:1094. [PMID: 31572414 PMCID: PMC6751313 DOI: 10.3389/fpls.2019.01094] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Accepted: 08/09/2019] [Indexed: 05/17/2023]
Abstract
The inhibition of hypocotyl elongation by ethylene in dark-grown seedlings was the basis of elegant screens that identified ethylene-insensitive Arabidopsis mutants, which remained tall even when treated with high concentrations of ethylene. This simple approach proved invaluable for identification and molecular characterization of major players in the ethylene signaling and response pathway, including receptors and downstream signaling proteins, as well as transcription factors that mediate the extensive transcriptional remodeling observed in response to elevated ethylene. However, the dark-adapted early developmental stage used in these experiments represents only a small segment of a plant's life cycle. After a seedling's emergence from the soil, light signaling pathways elicit a switch in developmental programming and the hormonal circuitry that controls it. Accordingly, ethylene levels and responses diverge under these different environmental conditions. In this review, we compare and contrast ethylene synthesis, perception, and response in light and dark contexts, including the molecular mechanisms linking light responses to ethylene biology. One powerful method to identify similarities and differences in these important regulatory processes is through comparison of transcriptomic datasets resulting from manipulation of ethylene levels or signaling under varying light conditions. We performed a meta-analysis of multiple transcriptomic datasets to uncover transcriptional responses to ethylene that are both light-dependent and light-independent. We identified a core set of 139 transcripts with robust and consistent responses to elevated ethylene across three root-specific datasets. This "gold standard" group of ethylene-regulated transcripts includes mRNAs encoding numerous proteins that function in ethylene signaling and synthesis, but also reveals a number of previously uncharacterized gene products that may contribute to ethylene response phenotypes. Understanding these light-dependent differences in ethylene signaling and synthesis will provide greater insight into the roles of ethylene in growth and development across the entire plant life cycle.
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Affiliation(s)
- Alexandria F. Harkey
- Department of Biology and Center for Molecular Signaling, Wake Forest University, Winston-Salem, NC, United States
| | - Gyeong Mee Yoon
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, United States
| | - Dong Hye Seo
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, United States
| | - Alison DeLong
- Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI, United States
| | - Gloria K. Muday
- Department of Biology and Center for Molecular Signaling, Wake Forest University, Winston-Salem, NC, United States
- *Correspondence: Gloria K. Muday,
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63
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Wang L, Qiao H. New Insights in Transcriptional Regulation of the Ethylene Response in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2019; 10:790. [PMID: 31275338 PMCID: PMC6591485 DOI: 10.3389/fpls.2019.00790] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 05/31/2019] [Indexed: 05/19/2023]
Abstract
As any living organisms, plants must respond to a wide variety of environmental stimuli. Plant hormones regulate almost all aspects of plant growth and development. Among all the plant hormones, ethylene is the only gaseous plant hormone that plays pleiotropic roles in plant growth, plant development and stress responses. Transcription regulation is one main mechanism by which a cell orchestrates gene activity. This control allows the cell or organism to respond to a variety of intra- and extracellular signals and thus mount a response. Here we review the progress of transcription regulation in the ethylene response.
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Affiliation(s)
- Likai Wang
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX, United States
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, United States
| | - Hong Qiao
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, TX, United States
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, United States
- *Correspondence: Hong Qiao,
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64
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Berleth M, Berleth N, Minges A, Hänsch S, Burkart RC, Stork B, Stahl Y, Weidtkamp-Peters S, Simon R, Groth G. Molecular Analysis of Protein-Protein Interactions in the Ethylene Pathway in the Different Ethylene Receptor Subfamilies. FRONTIERS IN PLANT SCIENCE 2019; 10:726. [PMID: 31231408 PMCID: PMC6566107 DOI: 10.3389/fpls.2019.00726] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 05/16/2019] [Indexed: 05/06/2023]
Abstract
Signal perception and transmission of the plant hormone ethylene are mediated by a family of receptor histidine kinases located at the Golgi-ER network. Similar to bacterial and other plant receptor kinases, these receptors work as dimers or higher molecular weight oligomers at the membrane. Sequence analysis and functional studies of different isoforms suggest that the ethylene receptor family is classified into two subfamilies. In Arabidopsis, the type-I subfamily has two members (ETR1 and ERS1) and the type-II subfamily has three members (ETR2, ERS2, and EIN4). Whereas subfamily-I of the Arabidopsis receptors and their interactions with downstream elements in the ethylene pathway has been extensively studied in the past; related information on subfamily-II is sparse. In order to dissect the role of type-II receptors in the ethylene pathway and to decode processes associated with this receptor subfamily on a quantitative molecular level, we have applied biochemical and spectroscopic studies on purified recombinant receptors and downstream elements of the ethylene pathway. To this end, we have expressed purified ETR2 as a prototype of the type-II subfamily, ETR1 for the type-I subfamily and downstream ethylene pathway proteins CTR1 and EIN2. Functional folding of the purified receptors was demonstrated by CD spectroscopy and autokinase assays. Quantitative analysis of protein-protein interactions (PPIs) by microscale thermophoresis (MST) revealed that ETR2 has similar affinities for CTR1 and EIN2 as previously reported for the subfamily-I prototype ETR1 suggesting similar roles in PPI-mediated signal transfer for both subfamilies. We also used in planta fluorescence studies on transiently expressed proteins in Nicotiana benthamiana leaf cells to analyze homo- and heteromer formation of receptors. These studies show that type-II receptors as well as the type-I receptors form homo- and heteromeric complexes at these conditions. Notably, type-II receptor homomers and type-II:type-I heteromers are more stable than type-I homomers as indicated by their lower dissociation constants obtained in microscale thermophoresis studies. The enhanced stability of type-II complexes emphasizes the important role of type-II receptors in the ethylene pathway.
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Affiliation(s)
- Mareike Berleth
- Institute of Biochemical Plant Physiology, Heinrich Heine University, Düsseldorf, Germany
| | - Niklas Berleth
- Institute of Molecular Medicine I, Heinrich Heine University, Düsseldorf, Germany
| | - Alexander Minges
- Institute of Biochemical Plant Physiology, Heinrich Heine University, Düsseldorf, Germany
| | - Sebastian Hänsch
- Center for Advanced Imaging, Heinrich Heine University, Düsseldorf, Germany
| | | | - Björn Stork
- Institute of Molecular Medicine I, Heinrich Heine University, Düsseldorf, Germany
| | - Yvonne Stahl
- Institute for Developmental Genetics, Heinrich Heine University, Düsseldorf, Germany
| | | | - Rüdiger Simon
- Institute for Developmental Genetics, Heinrich Heine University, Düsseldorf, Germany
| | - Georg Groth
- Institute of Biochemical Plant Physiology, Heinrich Heine University, Düsseldorf, Germany
- *Correspondence: Georg Groth, ;
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65
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Auxin Controlled by Ethylene Steers Root Development. Int J Mol Sci 2018; 19:ijms19113656. [PMID: 30463285 PMCID: PMC6274790 DOI: 10.3390/ijms19113656] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 11/13/2018] [Accepted: 11/17/2018] [Indexed: 12/29/2022] Open
Abstract
Roots are important plant ground organs, which absorb water and nutrients to control plant growth and development. Phytohormones have been known to play a crucial role in the regulation of root growth, such as auxin and ethylene, which are central regulators of this process. Recent findings have revealed that root development and elongation regulated by ethylene are auxin dependent through alterations of auxin biosynthesis, transport and signaling. In this review, we focus on the recent advances in the study of auxin and auxin⁻ethylene crosstalk in plant root development, demonstrating that auxin and ethylene act synergistically to control primary root and root hair growth, but function antagonistically in lateral root formation. Moreover, ethylene modulates auxin biosynthesis, transport and signaling to fine-tune root growth and development. Thus, this review steps up the understanding of the regulation of auxin and ethylene in root growth.
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66
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Schuman MC, Baldwin IT. Field studies reveal functions of chemical mediators in plant interactions. Chem Soc Rev 2018; 47:5338-5353. [PMID: 29770376 DOI: 10.1039/c7cs00749c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Plants are at the trophic base of most ecosystems, embedded in a rich network of ecological interactions in which they evolved. While their limited range and speed of motion precludes animal-typical behavior, plants are accomplished chemists, producing thousands of specialized metabolites which may function to convey information, or even to manipulate the physiology of other organisms. Plants' complex interactions and their underlying mechanisms are typically dissected within the controlled environments of growth chambers and glasshouses, but doing so introduces conditions alien to plants evolved in natural environments, such as being pot-bound, and receiving artificial light with a spectrum very different from sunlight. The mechanistic understanding gained from a reductionist approach provides the tools required to query and manipulate plant interactions in real-world settings. The few tests conducted in natural ecosystems and agricultural fields have highlighted the limitations of studying plant interactions only in artificial environments. Here, we focus on three examples of known or hypothesized chemical mediators of plants' interactions: the volatile phytohormone ethylene (ET), more complex plant volatile blends, and as-yet-unknown mediators transferred by common mycorrhizal networks (CMNs). We highlight how mechanistic knowledge has advanced research in all three areas, and the critical importance of field work if we are to put our understanding of chemical ecology on rigorous experimental and theoretical footing, and demonstrate function.
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Affiliation(s)
- Meredith C Schuman
- Department of Molecular Ecology, Max Planck Institute for Chemical Ecology, Hans-Knöll-Straße 8, 07745 Jena, Germany.
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67
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Li C, Li C, Wang B, Zhang R, Fu K, Gale WJ, Li C. Programmed cell death in wheat (Triticum aestivum L.) endosperm cells is affected by drought stress. PROTOPLASMA 2018; 255:1039-1052. [PMID: 29380071 DOI: 10.1007/s00709-018-1203-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Accepted: 01/08/2018] [Indexed: 05/28/2023]
Abstract
Drought frequently occurs during wheat (Triticum aestivum L.) grain filling. The objectives of this study were (i) to investigate the effect of post-anthesis drought on programmed cell death (PCD) in wheat endosperm cells and (ii) to examine the role of ethylene (ETH) receptors and abscisic acid (ABA) in regulating wheat endosperm PCD. Two winter wheat cultivars ('Xindong 18' and 'Xindong 22') were used in this study. Grain samples were collected from normal and drought stressed plants at 5-day intervals between 5 and 35 days post-anthesis. The samples were then compared with respect to cell viability, nuclear morphometry, cell ultrastructure, DNA integrity, nucleic acid content, and nuclease activity. Analysis was also conducted about gene transcripts related to PCD, ETH receptors, and ABA biosynthesis and degradation. Drought stress reduced cell viability, accelerated nuclear deformation, and increased mitochondrial dissolution. The activity of nucleic acid hydrolase was greater, and the nucleic acid concentrations were less in the drought treatments than in the control. As a result, the peak in DNA fragmentation occurred earlier in the drought treatment. Drought stress significantly increased the expression of four genes related to ABA (nced1, nced2, ao1, ao2). In contrast, drought significantly reduced the expression of four genes related to ETH receptors (ers1, ers2 etr1, etr2) and one gene related to PCD (dad1). In summary, the results indicated that drought stress caused PCD to occur earlier in the endosperm of winter wheat.
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Affiliation(s)
- Chao Li
- College of Agriculture/The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China
| | - Cheng Li
- College of Agriculture/The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China
| | - Bingbing Wang
- College of Agriculture/The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China
| | - Runqi Zhang
- College of Agriculture/The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China
| | - Kaiyong Fu
- College of Agriculture/The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China
| | - William J Gale
- College of Agriculture/The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China
| | - Chunyan Li
- College of Agriculture/The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, Xinjiang, 832000, People's Republic of China.
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68
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Harkey AF, Watkins JM, Olex AL, DiNapoli KT, Lewis DR, Fetrow JS, Binder BM, Muday GK. Identification of Transcriptional and Receptor Networks That Control Root Responses to Ethylene. PLANT PHYSIOLOGY 2018; 176:2095-2118. [PMID: 29259106 PMCID: PMC5841720 DOI: 10.1104/pp.17.00907] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 12/17/2017] [Indexed: 05/20/2023]
Abstract
Transcriptomic analyses with high temporal resolution provide substantial new insight into hormonal response networks. This study identified the kinetics of genome-wide transcript abundance changes in response to elevated levels of the plant hormone ethylene in roots from light-grown Arabidopsis (Arabidopsis thaliana) seedlings, which were overlaid on time-matched developmental changes. Functional annotation of clusters of transcripts with similar temporal patterns revealed rapidly induced clusters with known ethylene function and more slowly regulated clusters with novel predicted functions linked to root development. In contrast to studies with dark-grown seedlings, where the canonical ethylene response transcription factor, EIN3, is central to ethylene-mediated development, the roots of ein3 and eil1 single and double mutants still respond to ethylene in light-grown seedlings. Additionally, a subset of these clusters of ethylene-responsive transcripts were enriched in targets of EIN3 and ERFs. These results are consistent with EIN3-independent developmental and transcriptional changes in light-grown roots. Examination of single and multiple gain-of-function and loss-of-function receptor mutants revealed that, of the five ethylene receptors, ETR1 controls lateral root and root hair initiation and elongation and the synthesis of other receptors. These results provide new insight into the transcriptional and developmental responses to ethylene in light-grown seedlings.
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Affiliation(s)
- Alexandria F Harkey
- Department of Biology and Center for Molecular Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Justin M Watkins
- Department of Biology and Center for Molecular Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Amy L Olex
- Department of Computer Science, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Kathleen T DiNapoli
- Department of Biology and Center for Molecular Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Daniel R Lewis
- Department of Biology and Center for Molecular Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Jacquelyn S Fetrow
- Department of Computer Science, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Brad M Binder
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, Tennessee 37996
| | - Gloria K Muday
- Department of Biology and Center for Molecular Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
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69
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Milić D, Dick M, Mulnaes D, Pfleger C, Kinnen A, Gohlke H, Groth G. Recognition motif and mechanism of ripening inhibitory peptides in plant hormone receptor ETR1. Sci Rep 2018; 8:3890. [PMID: 29497085 PMCID: PMC5832771 DOI: 10.1038/s41598-018-21952-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 02/13/2018] [Indexed: 12/21/2022] Open
Abstract
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.
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Affiliation(s)
- Dalibor Milić
- Institute of Biochemical Plant Physiology and Bioeconomy Science Center (BioSC), Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Department of Structural and Computational Biology, Max F. Perutz Laboratories, University of Vienna, Vienna Biocenter, Vienna, Austria
| | - Markus Dick
- Institute of Pharmaceutical and Medicinal Chemistry and Bioeconomy Science Center (BioSC), Heinrich Heine University Düsseldorf, Düsseldorf, Germany
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California, USA
| | - Daniel Mulnaes
- Institute of Pharmaceutical and Medicinal Chemistry and Bioeconomy Science Center (BioSC), Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Christopher Pfleger
- Institute of Pharmaceutical and Medicinal Chemistry and Bioeconomy Science Center (BioSC), Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Anna Kinnen
- Institute of Biochemical Plant Physiology and Bioeconomy Science Center (BioSC), Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Holger Gohlke
- Institute of Pharmaceutical and Medicinal Chemistry and Bioeconomy Science Center (BioSC), Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
- John von Neumann Institute for Computing (NIC), Jülich Supercomputing Centre (JSC) & Institute for Complex Systems - Structural Biochemistry (ICS 6), Forschungszentrum Jülich GmbH, Jülich, Germany.
| | - Georg Groth
- Institute of Biochemical Plant Physiology and Bioeconomy Science Center (BioSC), Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
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70
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Kong HG, Shin TS, Kim TH, Ryu CM. Stereoisomers of the Bacterial Volatile Compound 2,3-Butanediol Differently Elicit Systemic Defense Responses of Pepper against Multiple Viruses in the Field. FRONTIERS IN PLANT SCIENCE 2018; 9:90. [PMID: 29527214 PMCID: PMC5829544 DOI: 10.3389/fpls.2018.00090] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Accepted: 01/16/2018] [Indexed: 05/21/2023]
Abstract
The volatile compound 2,3-butanediol, which is produced by certain strains of root-associated bacteria, consists of three stereoisomers, namely, two enantiomers (2R,3R- and 2S,3S-butanediol) and one meso compound (2R,3S-butanediol). The ability of 2,3-butanediol to induce plant resistance against pathogenic fungi and bacteria has been investigated; however, little is known about its effects on induced resistance against viruses in plants. To investigate the effects of 2,3-butanediol on plant systemic defense against viruses, we evaluated the disease control capacity of each of its three stereoisomers in pepper. Specifically, we investigated the optimal concentration of 2,3-butanediol to use for disease control against Cucumber mosaic virus and Tobacco mosaic virus in the greenhouse and examined the effects of drench application of these compounds in the field. In the field trial, treatment with 2R,3R-butanediol and 2R,3S-butanediol significantly reduced the incidence of naturally occurring viruses compared with 2S,3S-butanediol and control treatments. In addition, 2R,3R-butanediol treatment induced the expression of plant defense marker genes in the salicylic acid, jasmonic acid, and ethylene signaling pathways to levels similar to those of the benzothiadiazole-treated positive control. This study reports the first field trial showing that specific stereoisomers of 2,3-butanediol trigger plant immunity against multiple viruses.
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Affiliation(s)
- Hyun G. Kong
- Molecular Phytobacteriology Laboratory, Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Teak S. Shin
- Crop Protection R&D Center, Farm Hannong Co., Ltd., Nonsan-si, South Korea
| | - Tae H. Kim
- Crop Protection R&D Center, Farm Hannong Co., Ltd., Nonsan-si, South Korea
| | - Choong-Min Ryu
- Molecular Phytobacteriology Laboratory, Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
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71
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Ma N, Ma C, Liu Y, Shahid MO, Wang C, Gao J. Petal senescence: a hormone view. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:719-732. [PMID: 29425359 DOI: 10.1093/jxb/ery009] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Indexed: 05/20/2023]
Abstract
Flowers are highly complex organs that have evolved to enhance the reproductive success of angiosperms. As a key component of flowers, petals play a vital role in attracting pollinators and ensuring successful pollination. Having fulfilled this function, petals senesce through a process that involves many physiological and biochemical changes that also occur during leaf senescence. However, petal senescence is distinct, due to the abundance of secondary metabolites in petals and the fact that petal senescence is irreversible. Various phytohormones are involved in regulating petal senescence, and are thought to act both synergistically and antagonistically. In this regard, there appears to be developmental point during which such regulatory signals are sensed and senescence is initiated. Here, we review current understanding of petal senescence, and discuss associated regulatory mechanisms involving hormone interactions and epigenetic regulation.
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Affiliation(s)
- Nan Ma
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing, China
| | - Chao Ma
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing, China
| | - Yang Liu
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing, China
| | - Muhammad Owais Shahid
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing, China
| | - Chengpeng Wang
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing, China
| | - Junping Gao
- Beijing Key Laboratory of Development and Quality Control of Ornamental Crops, Department of Ornamental Horticulture, China Agricultural University, Beijing, China
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72
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Bakshi A, Piya S, Fernandez JC, Chervin C, Hewezi T, Binder BM. Ethylene Receptors Signal via a Noncanonical Pathway to Regulate Abscisic Acid Responses. PLANT PHYSIOLOGY 2018; 176:910-929. [PMID: 29158332 PMCID: PMC5761792 DOI: 10.1104/pp.17.01321] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 11/17/2017] [Indexed: 05/04/2023]
Abstract
Ethylene is a gaseous plant hormone perceived by a family of receptors in Arabidopsis (Arabidopsis thaliana) including ETHYLENE RESPONSE1 (ETR1) and ETR2. Previously we showed that etr1-6 loss-of-function plants germinate better and etr2-3 loss-of-function plants germinate worse than wild-type under NaCl stress and in response to abscisic acid (ABA). In this study, we expanded these results by showing that ETR1 and ETR2 have contrasting roles in the control of germination under a variety of inhibitory conditions for seed germination such as treatment with KCl, CuSO4, ZnSO4, and ethanol. Pharmacological and molecular biology results support a model where ETR1 and ETR2 are indirectly affecting the expression of genes encoding ABA signaling proteins to affect ABA sensitivity. The receiver domain of ETR1 is involved in this function in germination under these conditions and controlling the expression of genes encoding ABA signaling proteins. Epistasis analysis demonstrated that these contrasting roles of ETR1 and ETR2 do not require the canonical ethylene signaling pathway. To explore the importance of receptor-protein interactions, we conducted yeast two-hybrid screens using the cytosolic domains of ETR1 and ETR2 as bait. Unique interacting partners with either ETR1 or ETR2 were identified. We focused on three of these proteins and confirmed the interactions with receptors. Loss of these proteins led to faster germination in response to ABA, showing that they are involved in ABA responses. Thus, ETR1 and ETR2 have both ethylene-dependent and -independent roles in plant cells that affect responses to ABA.
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Affiliation(s)
- Arkadipta Bakshi
- Genome Science and Technology Program, University of Tennessee, Knoxville, Tennessee, 37996
| | - Sarbottam Piya
- Department of Plant Sciences, University of Tennessee, Knoxville, Tennessee, 37996
| | - Jessica C Fernandez
- Department of Biochemistry, Cellular, and Molecular Biology, University of Tennessee, Knoxville, Tennessee, 37996
| | - Christian Chervin
- Université de Toulouse, INP-ENSAT, INRA, UMR 990 Génomique et Biotechnologie des Fruits, F-31326 Castanet-Tolosan Cedex, France
| | - Tarek Hewezi
- Genome Science and Technology Program, University of Tennessee, Knoxville, Tennessee, 37996
- Department of Plant Sciences, University of Tennessee, Knoxville, Tennessee, 37996
| | - Brad M Binder
- Genome Science and Technology Program, University of Tennessee, Knoxville, Tennessee, 37996
- Department of Biochemistry, Cellular, and Molecular Biology, University of Tennessee, Knoxville, Tennessee, 37996
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73
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Zhang F, Wang L, Ko EE, Shao K, Qiao H. Histone Deacetylases SRT1 and SRT2 Interact with ENAP1 to Mediate Ethylene-Induced Transcriptional Repression. THE PLANT CELL 2018; 30:153-166. [PMID: 29298835 PMCID: PMC5810571 DOI: 10.1105/tpc.17.00671] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 12/06/2017] [Accepted: 12/23/2017] [Indexed: 05/19/2023]
Abstract
Ethylene plays pleiotropic 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. The acetylation of HISTONE3 at K9 (H3K9Ac) is specifically regulated by SRT1 and SRT2 in ethylene-repressed genes. In addition, the srt1 srt2 double mutation in Arabidopsis thaliana suppresses both the ENAP1ox and the EIN3ox constitutive ethylene response phenotypes, and the ethylene-induced transcriptional repression observed in EIN3ox plants is derepressed in the EIN3ox/srt1 srt2 mutant. SRT2 and ENAP1 both bind to promoter regions of genes negatively regulated by ethylene, reducing H3K9Ac levels and resulting in transcriptional repression. This work establishes a mechanism by which histone deacetylases SRT1 and SRT2 interact with ENAP1 to mediate transcriptional repression by regulating the levels of H3K9 acetylation in the ethylene signaling.
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Affiliation(s)
- Fan Zhang
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712
| | - Likai Wang
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712
| | - Eun Esther Ko
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712
| | - Kevin Shao
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712
| | - Hong Qiao
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712
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Kim NY, Jang YJ, Park OK. AP2/ERF Family Transcription Factors ORA59 and RAP2.3 Interact in the Nucleus and Function Together in Ethylene Responses. FRONTIERS IN PLANT SCIENCE 2018; 9:1675. [PMID: 30510560 PMCID: PMC6254012 DOI: 10.3389/fpls.2018.01675] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 10/26/2018] [Indexed: 05/19/2023]
Abstract
The gaseous plant hormone ethylene is a key signaling molecule regulating plant growth, development, and defense against pathogens. Octadecanoid-responsive arabidopsis 59 (ORA59) is an ethylene response factor (ERF) transcription factor and has been suggested to integrate ethylene and jasmonic acid signaling and regulate resistance to necrotrophic pathogens. Here we screened for ORA59 interactors using the yeast two-hybrid system to elucidate the molecular function of ORA59. This led to the identification of RELATED TO AP2.3 (RAP2.3), another ERF transcription factor belonging to the group VII ERF family. In binding assays, ORA59 and RAP2.3 interacted in the nucleus and showed ethylene-dependent nuclear localization. ORA59 played a positive role in ethylene-regulated responses, including the triple response, featured by short, thick hypocotyl and root, and exaggerated apical hook in dark-grown seedlings, and resistance to the necrotrophic pathogen Pectobacterium carotovorum, as shown by the increased and decreased ethylene sensitivity and disease resistance in ORA59-overexpressing (ORA59OE) and null mutant (ora59) plants, respectively. In genetic crosses, ORA59OE rap2.3 crossed lines lost ORA59-mediated positive effects and behaved like rap2.3 mutant. These results suggest that ORA59 physically interacts with RAP2.3 and that this interaction is important for the regulatory roles of ORA59 in ethylene responses.
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75
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Oh K, Hoshi T, Tomio S, Ueda K, Hara K. A Chemical Genetics Strategy that Identifies Small Molecules which Induce the Triple Response in Arabidopsis. Molecules 2017; 22:E2270. [PMID: 29257123 PMCID: PMC6149847 DOI: 10.3390/molecules22122270] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Revised: 12/10/2017] [Accepted: 12/13/2017] [Indexed: 11/23/2022] Open
Abstract
To explore small molecules with ethylene-like biological activity, we conducted a triple response-based assay system for chemical library screening. Among 9600 compounds, we found N-[(1,3,5-trimethyl-1H-pyrazol-4-yl)methyl]-N-methyl-2-naphthalenesulfonamide (EH-1) displayed promising biological activity on inducing a triple response in Arabidopsis seedlings. Chemical synthesis and structure-activity relationship (SAR) analysis of EH-1 analogues with different substitution patterns on the phenyl ring structure of the sulfonamide group indicated that 3,4-dichloro-N-methyl-N-(1,3,5-trimethyl-1H-pyrazol-4-yl-methyl) benzenesulfonamide (8) exhibits the most potent biological activity. To determine the mechanism of action, we conducted RNA sequencing (RNA-Seq) analysis of the effect of EH-1 and 1-aminocyclopropane-1-carboxylate (ACC), the precursor of ethylene biosynthesis, following the quantitative real-time polymerase chain reaction (RT-PCR) confirmation. Data obtained from RNA-Seq analysis indicated that EH-1 and ACC significantly induced the expression of 39 and 48 genes, respectively (above 20 fold of control), among which five genes are up-regulated by EH-1 as well as by ACC. We also found 67 and 32 genes that are significantly down-regulated, respectively, among which seven genes are in common. For quantitative RT-PCR analysis. 12 up-regulated genes were selected from the data obtained from RNA-Seq analysis. We found a good correlation of quantitative RT-PCR analysis and RNA-Seq analysis. Based on these results, we conclude that the action mechanism of EH-1 on inducing triple response in Arabidopsis is different from that of ACC.
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Affiliation(s)
- Keimei Oh
- Department of Biotechnology Production, Faculty of Bioresource Sciences, Akita Prefectural University, 241-438, Shimoshinjo Nakano, Akita 010-0195, Japan.
| | - Tomoki Hoshi
- Department of Biotechnology Production, Faculty of Bioresource Sciences, Akita Prefectural University, 241-438, Shimoshinjo Nakano, Akita 010-0195, Japan.
| | - Sumiya Tomio
- Department of Biotechnology Production, Faculty of Bioresource Sciences, Akita Prefectural University, 241-438, Shimoshinjo Nakano, Akita 010-0195, Japan.
| | - Kenji Ueda
- Department of Biotechnology Production, Faculty of Bioresource Sciences, Akita Prefectural University, 241-438, Shimoshinjo Nakano, Akita 010-0195, Japan.
| | - Kojiro Hara
- Department of Biotechnology Production, Faculty of Bioresource Sciences, Akita Prefectural University, 241-438, Shimoshinjo Nakano, Akita 010-0195, Japan.
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76
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Systems Phytohormone Responses to Mitochondrial Proteotoxic Stress. Mol Cell 2017; 68:540-551.e5. [DOI: 10.1016/j.molcel.2017.10.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 08/07/2017] [Accepted: 10/05/2017] [Indexed: 02/06/2023]
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Akakpo R, Scarcelli N, Chaïr H, Dansi A, Djedatin G, Thuillet AC, Rhoné B, François O, Alix K, Vigouroux Y. Molecular basis of African yam domestication: analyses of selection point to root development, starch biosynthesis, and photosynthesis related genes. BMC Genomics 2017; 18:782. [PMID: 29025393 PMCID: PMC5639766 DOI: 10.1186/s12864-017-4143-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 10/02/2017] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND After cereals, root and tuber crops are the main source of starch in the human diet. Starch biosynthesis was certainly a significant target for selection during the domestication of these crops. But domestication of these root and tubers crops is also associated with gigantism of storage organs and changes of habitat. RESULTS We studied here, the molecular basis of domestication in African yam, Dioscorea rotundata. The genomic diversity in the cultivated species is roughly 30% less important than its wild relatives. Two percent of all the genes studied showed evidences of selection. Two genes associated with the earliest stages of starch biosynthesis and storage, the sucrose synthase 4 and the sucrose-phosphate synthase 1 showed evidence of selection. An adventitious root development gene, a SCARECROW-LIKE gene was also selected during yam domestication. Significant selection for genes associated with photosynthesis and phototropism were associated with wild to cultivated change of habitat. If the wild species grow as vines in the shade of their tree tutors, cultivated yam grows in full light in open fields. CONCLUSIONS Major rewiring of aerial development and adaptation for efficient photosynthesis in full light characterized yam domestication.
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Affiliation(s)
- Roland Akakpo
- Institut de Recherche pour le Développement, Université de Montpellier, Unité Mixte de Recherche Diversité Adaptation et Développement des Plantes (UMR DIADE), 911, avenue Agropolis, 34394 Montpellier, France
- Unité Mixte de Recherche Génétique Quantitative et Evolutive – Le Moulon, INRA – Univ. Paris-Sud – CNRS – AgroParisTech, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
- Faculté des Sciences et Techniques de Dassa, Laboratoire de Biotechnologie, Ressources Génétiques et Amélioration des Espèces Animales et Végétales (BIORAVE), Université d’Abomey, Dassa-Zoumè, Benin
| | - Nora Scarcelli
- Institut de Recherche pour le Développement, Université de Montpellier, Unité Mixte de Recherche Diversité Adaptation et Développement des Plantes (UMR DIADE), 911, avenue Agropolis, 34394 Montpellier, France
| | - Hana Chaïr
- Centre International de la Recherche Agronomique pour le Développement, UMR AGAP, F-34398 Montpellier, France
| | - Alexandre Dansi
- Faculté des Sciences et Techniques de Dassa, Laboratoire de Biotechnologie, Ressources Génétiques et Amélioration des Espèces Animales et Végétales (BIORAVE), Université d’Abomey, Dassa-Zoumè, Benin
| | - Gustave Djedatin
- Faculté des Sciences et Techniques de Dassa, Laboratoire de Biotechnologie, Ressources Génétiques et Amélioration des Espèces Animales et Végétales (BIORAVE), Université d’Abomey, Dassa-Zoumè, Benin
| | - Anne-Céline Thuillet
- Institut de Recherche pour le Développement, Université de Montpellier, Unité Mixte de Recherche Diversité Adaptation et Développement des Plantes (UMR DIADE), 911, avenue Agropolis, 34394 Montpellier, France
| | - Bénédicte Rhoné
- Institut de Recherche pour le Développement, Université de Montpellier, Unité Mixte de Recherche Diversité Adaptation et Développement des Plantes (UMR DIADE), 911, avenue Agropolis, 34394 Montpellier, France
- Université Lyon 1, CNRS, UMR 5558, Laboratoire de Biométrie et Biologie Evolutive, Lyon, France
| | | | - Karine Alix
- Unité Mixte de Recherche Génétique Quantitative et Evolutive – Le Moulon, INRA – Univ. Paris-Sud – CNRS – AgroParisTech, Université Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Yves Vigouroux
- Institut de Recherche pour le Développement, Université de Montpellier, Unité Mixte de Recherche Diversité Adaptation et Développement des Plantes (UMR DIADE), 911, avenue Agropolis, 34394 Montpellier, France
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EIN2 mediates direct regulation of histone acetylation in the ethylene response. Proc Natl Acad Sci U S A 2017; 114:10274-10279. [PMID: 28874528 DOI: 10.1073/pnas.1707937114] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
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. Specifically, in the presence of ethylene, ENAP1-binding regions are more accessible upon the interaction with EIN2, and more EIN3 proteins bind to the loci where ENAP1 is enriched for a quick response. Together, these results reveal EIN2-C is the key factor regulating H3K14Ac and H3K23Ac in response to ethylene and uncover a unique mechanism by which ENAP1 interacts with chromatin, potentially preserving the open chromatin regions in the absence of ethylene; in the presence of ethylene, EIN2 interacts with ENAP1, elevating the levels of H3K14Ac and H3K23Ac, promoting more EIN3 binding to the targets shared with ENAP1 and resulting in a rapid transcriptional regulation.
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79
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Sharan A, Soni P, Nongpiur RC, Singla-Pareek SL, Pareek A. Mapping the 'Two-component system' network in rice. Sci Rep 2017; 7:9287. [PMID: 28839155 PMCID: PMC5571105 DOI: 10.1038/s41598-017-08076-w] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Accepted: 07/06/2017] [Indexed: 01/20/2023] Open
Abstract
Two-component system (TCS) in plants is a histidine to aspartate phosphorelay based signaling system. Rice genome has multifarious TCS signaling machinery comprising of 11 histidine kinases (OsHKs), 5 histidine phosphotransferases (OsHPTs) and 36 response regulators (OsRRs). However, how these TCS members interact with each other and comprehend diverse signaling cascades remains unmapped. Using a highly stringent yeast two-hybrid (Y2H) platform and extensive in planta bimolecular fluorescence complementation (BiFC) assays, distinct arrays of interaction between various TCS proteins have been identified in the present study. Based on these results, an interactome map of TCS proteins has been assembled. This map clearly shows a cross talk in signaling, mediated by different sensory OsHKs. It also highlights OsHPTs as the interaction hubs, which interact with OsRRs, mostly in a redundant fashion. Remarkably, interactions between type-A and type-B OsRRs have also been revealed for the first time. These observations suggest that feedback regulation by type-A OsRRs may also be mediated by interference in signaling at the level of type-B OsRRs, in addition to OsHPTs, as known previously. The interactome map presented here provides a starting point for in-depth molecular investigations for signal(s) transmitted by various TCS modules into diverse biological processes.
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Affiliation(s)
- Ashutosh Sharan
- Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Praveen Soni
- Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Ramsong Chantre Nongpiur
- Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India
| | - Sneh L Singla-Pareek
- Plant Stress Biology, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
| | - Ashwani Pareek
- Stress Physiology and Molecular Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi, India.
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80
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The activation of OsEIL1 on YUC8 transcription and auxin biosynthesis is required for ethylene-inhibited root elongation in rice early seedling development. PLoS Genet 2017; 13:e1006955. [PMID: 28829777 PMCID: PMC5581195 DOI: 10.1371/journal.pgen.1006955] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 09/01/2017] [Accepted: 08/04/2017] [Indexed: 11/21/2022] Open
Abstract
Rice is an important monocotyledonous crop worldwide; it differs from the dicotyledonous plant Arabidopsis in many aspects. In Arabidopsis, ethylene and auxin act synergistically to regulate root growth and development. However, their interaction in rice is still unclear. Here, we report that the transcriptional activation of OsEIL1 on the expression of YUC8/REIN7 and indole-3-pyruvic acid (IPA)-dependent auxin biosynthesis is required for ethylene-inhibited root elongation. Using an inhibitor of YUC activity, which regulates auxin biosynthesis via the conversion of IPA to indole-3-acetic acid (IAA), we showed that ethylene-inhibited primary root elongation is dependent on YUC-based auxin biosynthesis. By screening phenotypes of seedling primary root from mutagenesis libraries following ethylene treatment, we identified a rice ethylene-insensitive mutant, rein7-1, in which YUC8/REIN7 is truncated at its C-terminus. Mutation in YUC8/REIN7 reduced auxin biosynthesis in rice, while YUC8/REIN7 overexpression enhanced ethylene sensitivity in the roots. Moreover, YUC8/REIN7 catalyzed the conversion of IPA to IAA, truncated version at C-terminal end of the YUC8/REIN7 resulted in significant reduction of enzymatic activity, indicating that YUC8/REIN7 is required for IPA-dependent auxin biosynthesis and ethylene-inhibited root elongation in rice early seedlings. Further investigations indicated that ethylene induced YUC8/REIN7 expression and promoted auxin accumulation in roots. Addition of low concentrations of IAA rescued the ethylene response in the rein7-1, strongly demonstrating that ethylene-inhibited root elongation depends on IPA-dependent auxin biosynthesis. Genetic studies revealed that YUC8/REIN7-mediated auxin biosynthesis functioned downstream of OsEIL1, which directly activated the expression of YUC8/REIN7. Thus, our findings reveal a model of interaction between ethylene and auxin in rice seedling primary root elongation, enhancing our understanding of ethylene signaling in rice. Rice is an important crop worldwide and is grown in water-saturated environments during its life cycle. This unique feature confers that rice might have different aspects from Arabidopsis in ethylene signaling. Although the crosstalk between ethylene and auxin is well understood in Arabidopsis, however, the interaction in rice is largely unclear. Here, we show that YUC8/REIN7, a member of the YUC gene family, catalyzing the conversion of IPA to IAA in auxin biosynthesis, is transcriptionally modulated by ethylene signaling component OsEIL1, and mainly participates in auxin biosynthesis and ethylene-inhibited root growth. We first identified that ethylene-inhibited root elongation is suppressed by the inhibitor of YUC activity, and YUC8/REIN7 is required for IPA-dependent auxin biosynthesis, indicating that YUC8/REIN7 is involved in ethylene-inhibited root elongation in rice early seedlings. Moreover, ethylene induced YUC8/REIN7 transcription and promoted auxin accumulation in roots. Addition of low concentrations of IAA rescued the ethylene response in the rein7-1, demonstrating that ethylene stimulates auxin biosynthesis dependent on YUC8/REIN7 function. Further evidence revealed that OsEIL1 transcriptionally activates the expression of YUC8/REIN7, and YUC8/REIN7-mediated auxin biosynthesis genetically acts downstream of OsEIL1. Our data in the present report identified an interaction between ethylene and auxin in rice seedling primary root elongation, increasing our understanding of ethylene signaling in rice root growth.
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81
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Yu M, Yau CP, Yip WK. Differentially localized rice ethylene receptors OsERS1 and OsETR2 and their potential role during submergence. PLANT SIGNALING & BEHAVIOR 2017; 12:e1356532. [PMID: 28758833 PMCID: PMC5616157 DOI: 10.1080/15592324.2017.1356532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Ethylene is gaseous plant hormone that controls a variety of physiologic activities. OsERS1 and OsETR2 are major ethylene receptors in rice that have been reported to have different regulatory functions. The GFP fused N-terminus of OsERS1 and OsETR2 showed differentially localization patterns when transiently expressed in onion epidermal cells. Base on these results, we suggested that OsERS1 could be localized to plasma membranes, whereas OsETR2 could be localized to the endoplasmic reticulum. Furthermore, instead of the constitutive expression profile of OsERS1, OsETR2 is differentially expressed in seedlings of light/dark-grown conditions, submergence or exogenous ethylene treatments. Our results and others support the notion that OsERS1 and OsETR2 could have different roles during rice plant submergence.
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Affiliation(s)
- Manda Yu
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, R.O.C
| | - Chi Ping Yau
- School of Biological Sciences, The University of Hong Kong, Hong Kong, China
| | - Wing Kin Yip
- School of Biological Sciences, The University of Hong Kong, Hong Kong, China
- CONTACT Wing Kin Yip 7S09 Kadoorie Biological Sciences Building, School of Biological Sciences, The University of Hong Kong, Hong Kong, China
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82
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Jayasinghege CPA, Ozga JA, Waduthanthri KD, Reinecke DM. Regulation of ethylene-related gene expression by indole-3-acetic acid and 4-chloroindole-3-acetic acid in relation to pea fruit and seed development. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:4137-4151. [PMID: 28922757 PMCID: PMC5853793 DOI: 10.1093/jxb/erx217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 06/16/2017] [Indexed: 05/08/2023]
Abstract
In pea, the auxins 4-chloroindole-3-acetic acid (4-Cl-IAA) and indole-3-acetic acid (IAA) occur naturally; however, only 4-Cl-IAA stimulates pericarp growth and gibberellin (GA) biosynthesis, and inhibits the ethylene response in deseeded ovaries (pericarps), mimicking the presence of seeds. Expression of ovary ethylene biosynthesis genes was regulated similarly in most cases by the presence of 4-Cl-IAA or seeds. PsACS1 [which encodes an enzyme that synthesizes 1-aminocyclopropane-1-carboxylic acid (ACC)] transcript abundance was high in pericarp tissue adjacent to developing seeds following pollination. ACC accumulation in 4-Cl-IAA-treated deseeded pericarps was driven by high PsASC1 expression (1800-fold). 4-Cl-IAA, but not IAA, also suppressed the pericarp transcript levels of PsACS4. 4-Cl-IAA increased PsACO1 and decreased PsACO2 and PsACO3 expression (enzymes that convert ACC to ethylene) but did not change ACO enzyme activity. Increased ethylene was countered by a 4-Cl-IAA-specific decrease in ethylene responsiveness potentially via modulation of pericarp ethylene receptor and signaling gene expression. This pattern did not occur in IAA-treated pericarps. Overall, the effect of 4-Cl-IAA and IAA on ethylene biosynthesis gene expression generally explains the ethylene evolution patterns, and their effects on GA biosynthesis and ethylene signaling gene expression explain the tissue response patterns in young pea ovaries.
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Affiliation(s)
- Charitha P A Jayasinghege
- Plant BioSystems, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Jocelyn A Ozga
- Plant BioSystems, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Kosala D Waduthanthri
- Plant BioSystems, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Dennis M Reinecke
- Plant BioSystems, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
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83
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Shen C, Wang J, Shi X, Kang Y, Xie C, Peng L, Dong C, Shen Q, Xu Y. Transcriptome Analysis of Differentially Expressed Genes Induced by Low and High Potassium Levels Provides Insight into Fruit Sugar Metabolism of Pear. FRONTIERS IN PLANT SCIENCE 2017; 8:938. [PMID: 28620410 PMCID: PMC5450510 DOI: 10.3389/fpls.2017.00938] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 05/19/2017] [Indexed: 05/14/2023]
Abstract
Potassium (K) deficiency is a common abiotic stress that can inhibit the growth of fruit and thus reduce crop yields. Little research has been conducted on pear transcriptional changes under low and high K conditions. Here, we performed an experiment with 7-year-old pot-grown "Huangguan" pear trees treated with low, Control or high K levels (0, 0.4, or 0.8 g·K2O/kg soil, respectively) during fruit enlargement and mature stages. We identified 36,444 transcripts from leaves and fruit using transcriptome sequencing technology. From 105 days after full blooming (DAB) to 129 DAB, the number of differentially expressed genes (DEGs) in leaves and fruit in response to low K increased, while in response to high K, the number of DEGs in leaves and fruit decreased. We selected 17 of these DEGs for qRT-PCR analysis to confirm the RNA sequencing results. Based on GO enrichment and KEGG pathway analysis, we found that low-K treatment significantly reduced K nutrient and carbohydrate metabolism of the leaves and fruit compared with the Control treatment. During the fruit development stages, AKT1 (gene39320) played an important role on K+ transport of the leaves and fruit response to K stress. At maturity, sucrose and acid metabolic pathways were inhibited by low K. The up-regulation of the expression of three SDH and two S6PDH genes involved in sorbitol metabolism was induced by low K, promoting the fructose accumulation. Simultaneously, higher expression was found for genes encoding amylase under low K, promoting the decomposition of the starch and leading the glucose accumulation. High K could enhance leaf photosynthesis, and improve the distribution of the nutrient and carbohydrate from leaf to fruit. Sugar components of the leaves and fruit under low K were regulated by the expression of genes encoding 8 types of hormone signals and reactive oxygen species (ROS). Our data revealed the gene expression patterns of leaves and fruit in response to different K levels during the middle and late stages of fruit development as well as the molecular mechanism of improvement of fruit sugar levels by K and provided a scientific basis for improving fruit quality with supplemental K fertilizers.
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Affiliation(s)
| | | | | | | | | | | | - Caixia Dong
- Key Laboratory of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River, Ministry of Agriculture, Jiangsu Key Laboratory of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, College of Resources and Environmental Science, Nanjing Agricultural UniversityNanjing, China
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84
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Xu G, Greene GH, Yoo H, Liu L, Marqués J, Motley J, Dong X. Global translational reprogramming is a fundamental layer of immune regulation in plants. Nature 2017; 545:487-490. [PMID: 28514447 PMCID: PMC5485861 DOI: 10.1038/nature22371] [Citation(s) in RCA: 131] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 04/19/2017] [Indexed: 12/22/2022]
Abstract
In the absence of specialized immune cells, the need for plants to reprogram transcription to transition from growth-related activities to defence is well understood1, 2. However, little is known about translational changes that occur during immune induction. Using ribosome footprinting (RF), we performed global translatome profiling on Arabidopsis exposed to the microbe-associated molecular pattern (MAMP) elf18. We found that during this pattern-triggered immunity (PTI), translation was tightly regulated and poorly correlated with transcription. Identification of genes with altered translational efficiency (TE) led to the discovery of novel regulators of this immune response. Further investigation of these genes showed that mRNA sequence features are major determinants of the observed TE changes. In the 5′ leader sequences of transcripts with increased TE, we found a highly enriched mRNA consensus sequence, R-motif, consisting of mostly purines. We showed that R-motif regulates translation in response to PTI induction through interaction with poly(A)-binding proteins. Therefore, this study provides not only strong evidence, but also a molecular mechanism for global translational reprogramming during PTI in plants.
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Affiliation(s)
- Guoyong Xu
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Department of Biology, Duke University, Durham, North Carolina 27708, USA
| | - George H Greene
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Department of Biology, Duke University, Durham, North Carolina 27708, USA
| | - Heejin Yoo
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Department of Biology, Duke University, Durham, North Carolina 27708, USA
| | - Lijing Liu
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Department of Biology, Duke University, Durham, North Carolina 27708, USA
| | - Jorge Marqués
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Department of Biology, Duke University, Durham, North Carolina 27708, USA
| | - Jonathan Motley
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Department of Biology, Duke University, Durham, North Carolina 27708, USA
| | - Xinnian Dong
- Howard Hughes Medical Institute-Gordon and Betty Moore Foundation, Department of Biology, Duke University, Durham, North Carolina 27708, USA
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85
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Merchante C, Stepanova AN. The Triple Response Assay and Its Use to Characterize Ethylene Mutants in Arabidopsis. Methods Mol Biol 2017; 1573:163-209. [PMID: 28293847 DOI: 10.1007/978-1-4939-6854-1_13] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Exposure of plants to ethylene results in drastic morphological changes. Seedlings germinated in the dark in the presence of saturating concentrations of ethylene display a characteristic phenotype known as the triple response. This phenotype is robust and easy to score. In Arabidopsis the triple response is usually evaluated at 3 days post germination in seedlings grown in the dark in rich media supplemented with 10 μM of the ethylene precursor ACC in air or in unsupplemented media in the presence of 10 ppm ethylene. The triple response in Arabidopsis consists of shortening and thickening of hypocotyls and roots and exaggeration of the curvature of apical hooks. The search for Arabidopsis mutants that fail to show this phenotype in ethylene or, vice versa, display the triple response in the absence of exogenously supplied hormone has allowed the identification of the key components of the ethylene biosynthesis and signaling pathways. Herein, we describe a simple protocol for assaying the triple response in Arabidopsis. The method can also be employed in many other dicot species, with minor modifications to account for species-specific differences in germination. We also compiled a comprehensive table of ethylene-related mutants of Arabidopsis, including many lines with auxin-related defects, as wild-type levels of auxin biosynthesis, transport, signaling, and response are necessary for the normal response of plants to ethylene.
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Affiliation(s)
- Catharina Merchante
- Departamento de Biología Molecular y Bioquímica, Instituto de Hortofruticultura Subtropical y Mediterranea (IHSM)-UMA-CSIC, Universidad de Málaga, 29071, Málaga, Spain
| | - Anna N Stepanova
- Department of Plant and Microbial Biology, North Carolina State University, Raleigh, NC, 27695, USA. .,Genetics Graduate Program, North Carolina State University, Raleigh, NC, 27695, USA.
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Kessenbrock M, Klein SM, Müller L, Hunsche M, Noga G, Groth G. Novel Protein-Protein Inhibitor Based Approach to Control Plant Ethylene Responses: Synthetic Peptides for Ripening Control. FRONTIERS IN PLANT SCIENCE 2017; 8:1528. [PMID: 28928762 PMCID: PMC5591945 DOI: 10.3389/fpls.2017.01528] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 08/21/2017] [Indexed: 05/13/2023]
Abstract
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. EIN2 nuclear transport, but also interaction with the receptors sensing the ethylene signal, both, depend on a nuclear localization signal (NLS) located at the EIN2 C-terminus. Loss of the tight interaction between receptors and EIN2 affects ethylene signaling and impairs plant ethylene responses. Synthetic peptides derived from the NLS sequence interfere with the EIN2-receptor interaction and have utility in controlling plant ethylene responses such as ripening. Here, we report that a synthetic peptide (NOP-1) corresponding to the NLS motif of Arabidopsis EIN2 (aa 1262-1269) efficiently binds to tomato ethylene receptors LeETR4 and NR and delays ripening in the post-harvest phase when applied to the surface of sampled green fruits pre-harvest. In particular, degradation of chlorophylls was delayed by several days, as monitored by optical sensors and confirmed by analytical methods. Similarly, accumulation of β-carotene and lycopene in the fruit pulp after NOP-1 application was delayed, without having impact on the total pigment concentration in the completely ripe fruits. Likewise, the peptide had no negative effects on fruit quality. Our molecular and phenotypic studies reveal that peptide biologicals could contribute to the development of a novel family of ripening inhibitors and innovative ripening control in climacteric fruit.
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Affiliation(s)
- Mareike Kessenbrock
- Institute of Biochemical Plant Physiology, Heinrich Heine University DüsseldorfDüsseldorf, Germany
| | - Simone M. Klein
- Institute of Crop Science and Resource Conservation – Horticultural Science, University of BonnBonn, Germany
| | - Lena Müller
- Institute of Biochemical Plant Physiology, Heinrich Heine University DüsseldorfDüsseldorf, Germany
| | - Mauricio Hunsche
- Institute of Crop Science and Resource Conservation – Horticultural Science, University of BonnBonn, Germany
- COMPO EXPERT GmbHMünster, Germany
| | - Georg Noga
- Institute of Crop Science and Resource Conservation – Horticultural Science, University of BonnBonn, Germany
| | - Georg Groth
- Institute of Biochemical Plant Physiology, Heinrich Heine University DüsseldorfDüsseldorf, Germany
- Bioeconomy Science Center, Forschungszentrum JülichJülich, Germany
- *Correspondence: Georg Groth, ;
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87
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Zhang F, wang L, Lim JY, Kim T, Pyo Y, Sung S, Shin C, Qiao H. Phosphorylation of CBP20 Links MicroRNA to Root Growth in the Ethylene Response. PLoS Genet 2016; 12:e1006437. [PMID: 27870849 PMCID: PMC5147770 DOI: 10.1371/journal.pgen.1006437] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/21/2016] [Indexed: 11/18/2022] Open
Abstract
Ethylene is one of the most important hormones for plant developmental processes and stress responses. However, the phosphorylation regulation in the ethylene signaling pathway is largely unknown. Here we report the phosphorylation of cap binding protein 20 (CBP20) at Ser245 is regulated by ethylene, and the phosphorylation is involved in root growth. The constitutive phosphorylation mimic form of CBP20 (CBP20S245E or CBP20S245D), while not the constitutive de-phosphorylation form of CBP20 (CBP20S245A) is able to rescue the root ethylene responsive phenotype of cbp20. By genome wide study with ethylene regulated gene expression and microRNA (miRNA) expression in the roots and shoots of both Col-0 and cbp20, we found miR319b is up regulated in roots while not in shoots, and its target MYB33 is specifically down regulated in roots with ethylene treatment. We described both the phenotypic and molecular consequences of transgenic over-expression of miR319b. Increased levels of miR319b (miR319bOE) leads to enhanced ethylene responsive root phenotype and reduction of MYB33 transcription level in roots; over expression of MYB33, which carrying mutated miR319b target site (mMYB33) in miR319bOE is able to recover both the root phenotype and the expression level of MYB33. Taken together, we proposed that ethylene regulated phosphorylation of CBP20 is involved in the root growth and one pathway is through the regulation of miR319b and its target MYB33 in roots. Ethylene is one of the most essential hormones for plant developmental processes and stress responses. However, the phosphorylation regulation in the ethylene signaling pathway is largely unknown. Here we found that ethylene induces the phosphorylation of CBP20 at S245, and the phosphorylation is involved in root growth. Genome wide study on ethylene regulated gene expression and microRNA expression together with genetic validation suggest that ethylene- induced phosphorylation of CBP20 is involved in root growth and one pathway is through the regulation of miR319b and its target gene MYB33. This study provides evidence showing a new link of cap binding protein phosphorylation associated microRNA to root growth in the ethylene response.
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Affiliation(s)
- Fan Zhang
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, United States of America
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, United States of America
| | - Likai wang
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, United States of America
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, United States of America
| | - Jae Yun Lim
- Department of Agricultural Biotechnology, Seoul National University, Gwanak-gu, Seoul, Republic of Korea
| | - Taewook Kim
- Department of Agricultural Biotechnology, Seoul National University, Gwanak-gu, Seoul, Republic of Korea
| | - Youngjae Pyo
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, United States of America
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, United States of America
| | - Sibum Sung
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, United States of America
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, United States of America
| | - Chanseok Shin
- Department of Agricultural Biotechnology, Seoul National University, Gwanak-gu, Seoul, Republic of Korea
- Research Institute of Agriculture and Life Sciences, and Plant Genomics and Breeding Institute, Seoul National University, Seoul, Republic of Korea
| | - Hong Qiao
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, United States of America
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, United States of America
- * E-mail:
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88
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Liu F, Hu L, Cai Y, Lin H, Liu J, Yu Y. Molecular Characterization and Functional Analysis of Two Petunia PhEILs. FRONTIERS IN PLANT SCIENCE 2016; 7:1606. [PMID: 27847510 PMCID: PMC5088505 DOI: 10.3389/fpls.2016.01606] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 10/12/2016] [Indexed: 05/29/2023]
Abstract
Ethylene plays an important role in flower senescence of many plants. Arabidopsis ETHYLENE INSENSITIVE3 (EIN3) and its homolog EIL1 are the downstream component of ethylene signaling transduction. However, the function of EILs during flower senescence remains unknown. Here, a petunia EIL gene, PhEIL2, was isolated. Phylogenetic tree showed that PhEIL1, whose coding gene is previously isolated, and PhEIL2 are the homologs of Arabidopsis AtEIL3 and AtEIL1, respectively. The expression of both PhEIL1 and PhEIL2 is the highest in corollas and increased during corolla senescence. Ethylene treatment increased the mRNA level of PhEIL1 but reduced that of PhEIL2. VIGS-mediated both PhEIL1 and PhEIL2 silencing delayed flower senescence, and significantly reduced ethylene production and the expression of PhERF3 and PhCP2, two senescence-associated genes in petunia flowers. The PhEIL2 protein activating transcription domain is identified in the 353-612-amino acids at C-terminal of PhEIL2 and yeast two-hybrid and bimolecular fluorescence complementation assays show that PhEIL2 interacts with PhEIL1, suggesting that PhEIL1 and PhEIL2 might form heterodimers to recognize their targets. These molecular characterizations of PhEIL1 and PhEIL2 in petunia are different with those of in Vigna radiata and Arabidopsis.
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Affiliation(s)
- Feng Liu
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural UniversityGuangzhou, China
- College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Li Hu
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural UniversityGuangzhou, China
| | - Yuanping Cai
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural UniversityGuangzhou, China
| | - Hong Lin
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural UniversityGuangzhou, China
| | - Juanxu Liu
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural UniversityGuangzhou, China
| | - Yixun Yu
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural UniversityGuangzhou, China
- College of Horticulture, South China Agricultural UniversityGuangzhou, China
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89
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Ambrosone A, Batelli G, Bostan H, D'Agostino N, Chiusano ML, Perrotta G, Leone A, Grillo S, Costa A. Distinct gene networks drive differential response to abrupt or gradual water deficit in potato. Gene 2016; 597:30-39. [PMID: 27771448 DOI: 10.1016/j.gene.2016.10.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 10/08/2016] [Accepted: 10/18/2016] [Indexed: 02/08/2023]
Abstract
Water-limiting conditions affect dramatically plant growth and development and, ultimately, yield of potato plants (Solanum tuberosum L.). Therefore, understanding the mechanisms underlying the response to water deficit is of paramount interest to obtain drought tolerant potato varieties. Herein, potato 10K cDNA array slides were used to profile transcriptomic changes of two potato cell populations under abrupt (shocked cells) or gradual exposure (adapted cells) to polyethylene glycol (PEG)-mediated water stress. Data analysis identified >1000 differentially expressed genes (DEGs) in our experimental conditions. Noteworthy, our microarray study also suggests that distinct gene networks underlie the cellular response to shock or gradual water stress. On the basis of our experimental findings, it is possible to speculate that DEGs identified in shocked cells participate in early protective and sensing mechanisms to environmental insults, while the genes whose expression was modulated in adapted cells are directly involved in the acquisition of a new cellular homeostasis to cope with water stress conditions. To validate microarray data obtained for potato cells, the expression analysis of 21 selected genes of interest was performed by Real-Time Quantitative Reverse Transcription PCR (qRT-PCR). Intriguingly, the expression levels of these transcripts in 4-week old potato plants exposed to long-term water-deficit. qRT-PCR analysis showed that several genes were regulated similarly in potato cells cultures and tissues exposed to drought, thus confirming the efficacy of our simple experimental system to capture important genes involved in osmotic stress response. Highlighting the differences in gene expression between shock-like and adaptive response, our findings could contribute to the discussion on the biological function of distinct gene networks involved in the response to abrupt and gradual adaptation to water deficit.
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Affiliation(s)
- Alfredo Ambrosone
- National Research Council of Italy, Institute of Biosciences and BioResources, Research Division Portici (CNR-IBBR), Portici (NA), Italy
| | - Giorgia Batelli
- National Research Council of Italy, Institute of Biosciences and BioResources, Research Division Portici (CNR-IBBR), Portici (NA), Italy
| | - Hamed Bostan
- Department of Agricultural Sciences, University of Naples "Federico II", Portici (NA), Italy
| | - Nunzio D'Agostino
- Consiglio per la ricerca in agricoltura e l'analisi dell'economia agraria, Centro di ricerca per l'orticoltura (CREA-ORT), Pontecagnano Faiano (SA), Italy
| | - Maria Luisa Chiusano
- Department of Agricultural Sciences, University of Naples "Federico II", Portici (NA), Italy
| | - Gaetano Perrotta
- Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA), TRISAIA Research Center, Rotondella, MT, Italy
| | - Antonietta Leone
- Department of Pharmacy, University of Salerno, Fisciano SA, Italy
| | - Stefania Grillo
- National Research Council of Italy, Institute of Biosciences and BioResources, Research Division Portici (CNR-IBBR), Portici (NA), Italy
| | - Antonello Costa
- National Research Council of Italy, Institute of Biosciences and BioResources, Research Division Portici (CNR-IBBR), Portici (NA), Italy.
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90
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EIN2-dependent regulation of acetylation of histone H3K14 and non-canonical histone H3K23 in ethylene signalling. Nat Commun 2016; 7:13018. [PMID: 27694846 PMCID: PMC5063967 DOI: 10.1038/ncomms13018] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 08/25/2016] [Indexed: 12/18/2022] Open
Abstract
Ethylene gas is essential for many developmental processes and stress responses in plants. EIN2 plays a key role in ethylene signalling but its function remains enigmatic. Here, we show that ethylene specifically elevates acetylation of histone H3K14 and the non-canonical acetylation of H3K23 in etiolated seedlings. The up-regulation of these two histone marks positively correlates with ethylene-regulated transcription activation, and the elevation requires EIN2. Both EIN2 and EIN3 interact with a SANT domain protein named EIN2 nuclear associated protein 1 (ENAP1), overexpression of which results in elevation of histone acetylation and enhanced ethylene-inducible gene expression in an EIN2-dependent manner. On the basis of these findings we propose a model where, in the presence of ethylene, the EIN2 C terminus contributes to downstream signalling via the elevation of acetylation at H3K14 and H3K23. ENAP1 may potentially mediate ethylene-induced histone acetylation via its interactions with EIN2 C terminus. The translocation of the C-terminal domain of EIN2 to the nucleus is essential for induction of gene expression in response to the plant hormone ethylene. Here, Zhang et al. show that EIN2 is required for ethylene-inducible elevation of histone acetylation marks associated with transcriptional activation.
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91
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Light KM, Wisniewski JA, Vinyard WA, Kieber-Emmons MT. Perception of the plant hormone ethylene: known-knowns and known-unknowns. J Biol Inorg Chem 2016; 21:715-28. [DOI: 10.1007/s00775-016-1378-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 07/19/2016] [Indexed: 12/18/2022]
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92
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Song L, Yu H, Dong J, Che X, Jiao Y, Liu D. The Molecular Mechanism of Ethylene-Mediated Root Hair Development Induced by Phosphate Starvation. PLoS Genet 2016; 12:e1006194. [PMID: 27427911 PMCID: PMC4948871 DOI: 10.1371/journal.pgen.1006194] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 06/23/2016] [Indexed: 11/18/2022] Open
Abstract
Enhanced root hair production, which increases the root surface area for nutrient uptake, is a typical adaptive response of plants to phosphate (Pi) starvation. Although previous studies have shown that ethylene plays an important role in root hair development induced by Pi starvation, the underlying molecular mechanism is not understood. In this work, we characterized an Arabidopsis mutant, hps5, that displays constitutive ethylene responses and increased sensitivity to Pi starvation due to a mutation in the ethylene receptor ERS1. hps5 accumulates high levels of EIN3 protein, a key transcription factor involved in the ethylene signaling pathway, under both Pi sufficiency and deficiency. Pi starvation also increases the accumulation of EIN3 protein. Combined molecular, genetic, and genomic analyses identified a group of genes that affect root hair development by regulating cell wall modifications. The expression of these genes is induced by Pi starvation and is enhanced in the EIN3-overexpressing line. In contrast, the induction of these genes by Pi starvation is suppressed in ein3 and ein3eil1 mutants. EIN3 protein can directly bind to the promoter of these genes, some of which are also the immediate targets of RSL4, a key transcription factor that regulates root hair development. Based on these results, we propose that under normal growth conditions, the level of ethylene is low in root cells; a group of key transcription factors, including RSL4 and its homologs, trigger the transcription of their target genes to promote root hair development; Pi starvation increases the levels of the protein EIN3, which directly binds to the promoters of the genes targeted by RSL4 and its homologs and further increase their transcription, resulting in the enhanced production of root hairs. This model not only explains how ethylene mediates root hair responses to Pi starvation, but may provide a general mechanism for how ethylene regulates root hair development under both stress and non-stress conditions.
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Affiliation(s)
- Li Song
- Ministry of Education Key Laboratory of Bioinformatics, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Haopeng Yu
- State Key Laboratory of Plant Genomics, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Jinsong Dong
- Ministry of Education Key Laboratory of Bioinformatics, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Ximing Che
- Ministry of Education Key Laboratory of Bioinformatics, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, China
| | - Yuling Jiao
- State Key Laboratory of Plant Genomics, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Dong Liu
- Ministry of Education Key Laboratory of Bioinformatics, Center for Plant Biology, School of Life Sciences, Tsinghua University, Beijing, China
- * E-mail:
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93
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Wang H, Sun Y, Chang J, Zheng F, Pei H, Yi Y, Chang C, Dong CH. Regulatory function of Arabidopsis lipid transfer protein 1 (LTP1) in ethylene response and signaling. PLANT MOLECULAR BIOLOGY 2016; 91:471-484. [PMID: 27097903 DOI: 10.1007/s11103-016-0482-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 04/11/2016] [Indexed: 06/05/2023]
Abstract
Ethylene as a gaseous plant hormone is directly involved in various processes during plant growth and development. Much is known regarding the ethylene receptors and regulatory factors in the ethylene signal transduction pathway. In Arabidopsis thaliana, REVERSION-TO-ETHYLENE SENSITIVITY1 (RTE1) can interact with and positively regulates the ethylene receptor ETHYLENE RESPONSE1 (ETR1). In this study we report the identification and characterization of an RTE1-interacting protein, a putative Arabidopsis lipid transfer protein 1 (LTP1) of unknown function. Through bimolecular fluorescence complementation, a direct molecular interaction between LTP1 and RTE1 was verified in planta. Analysis of an LTP1-GFP fusion in transgenic plants and plasmolysis experiments revealed that LTP1 is localized to the cytoplasm. Analysis of ethylene responses showed that the ltp1 knockout is hypersensitive to 1-aminocyclopropanecarboxylic acid (ACC), while LTP1 overexpression confers insensitivity. Analysis of double mutants etr1-2 ltp1 and rte1-3 ltp1 demonstrates a regulatory function of LTP1 in ethylene receptor signaling through the molecular association with RTE1. This study uncovers a novel function of Arabidopsis LTP1 in the regulation of ethylene response and signaling.
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Affiliation(s)
- Honglin Wang
- College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Yue Sun
- College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Jianhong Chang
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD, 20742, USA
| | - Fangfang Zheng
- College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Haixia Pei
- College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Yanjun Yi
- College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Caren Chang
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, MD, 20742, USA.
| | - Chun-Hai Dong
- College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China.
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94
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Li YH, Wu QS, Huang X, Liu SH, Zhang HN, Zhang Z, Sun GM. Molecular Cloning and Characterization of Four Genes Encoding Ethylene Receptors Associated with Pineapple (Ananas comosus L.) Flowering. FRONTIERS IN PLANT SCIENCE 2016; 7:710. [PMID: 27252725 PMCID: PMC4878293 DOI: 10.3389/fpls.2016.00710] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Accepted: 05/09/2016] [Indexed: 05/29/2023]
Abstract
Exogenous ethylene, or ethephon, has been widely used to induce pineapple flowering, but the molecular mechanism behind ethephon induction is still unclear. In this study, we cloned four genes encoding ethylene receptors (designated AcERS1a, AcERS1b, AcETR2a, and AcETR2b). The 5' flanking sequences of these four genes were also cloned by self-formed adaptor PCR and SiteFinding-PCR, and a group of putative cis-acting elements was identified. Phylogenetic tree analysis indicated that AcERS1a, AcERS1b, AcETR2a, and AcETR2b belonged to the plant ERS1s and ETR2/EIN4-like groups. Quantitative real-time PCR showed that AcETR2a and AcETR2b (subfamily 2) were more sensitive to ethylene treatment compared with AcERS1a and AcERS1b (subfamily 1). The relative expression of AcERS1b, AcETR2a, and AcETR2b was significantly increased during the earlier period of pineapple inflorescence formation, especially at 1-9 days after ethylene treatment (DAET), whereas AcERS1a expression changed less than these three genes. In situ hybridization results showed that bract primordia (BP) and flower primordia (FP) appeared at 9 and 21 DAET, respectively, and flowers were formed at 37 DAET. AcERS1a, AcERS1b, AcETR2a, and AcETR2b were mainly expressed in the shoot apex at 1-4 DAET; thereafter, with the appearance of BP and FP, higher expression of these genes was found in these new structures. Finally, at 37 DAET, the expression of these genes was mainly focused in the flower but was also low in other structures. These findings indicate that these four ethylene receptor genes, especially AcERS1b, AcETR2a, and AcETR2b, play important roles during pineapple flowering induced by exogenous ethephon.
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Affiliation(s)
- Yun-He Li
- South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural SciencesZhanjiang, China
- Key Laboratory of Tropical Fruit Biology, Ministry of AgricultureZhanjiang, China
| | - Qing-Song Wu
- South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural SciencesZhanjiang, China
| | - Xia Huang
- The Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen UniversityGuangzhou, China
| | - Sheng-Hui Liu
- South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural SciencesZhanjiang, China
| | - Hong-Na Zhang
- South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural SciencesZhanjiang, China
| | - Zhi Zhang
- South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural SciencesZhanjiang, China
| | - Guang-Ming Sun
- South Subtropical Crop Research Institute, Chinese Academy of Tropical Agricultural SciencesZhanjiang, China
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95
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Jensen L, Hegelund JN, Olsen A, Lütken H, Müller R. A natural frameshift mutation in Campanula EIL2 correlates with ethylene insensitivity in flowers. BMC PLANT BIOLOGY 2016; 16:117. [PMID: 27215645 PMCID: PMC4877742 DOI: 10.1186/s12870-016-0786-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 04/14/2016] [Indexed: 05/04/2023]
Abstract
BACKGROUND The phytohormone ethylene plays a central role in development and senescence of climacteric flowers. In ornamental plant production, ethylene sensitive plants are usually protected against negative effects of ethylene by application of chemical inhibitors. In Campanula, flowers are sensitive to even minute concentrations of ethylene. RESULTS Monitoring flower longevity in three Campanula species revealed C. portenschlagiana (Cp) as ethylene sensitive, C. formanekiana (Cf) with intermediate sensitivity and C. medium (Cm) as ethylene insensitive. We identified key elements in ethylene signal transduction, specifically in Ethylene Response Sensor 2 (ERS2), Constitutive Triple Response 1 (CTR1) and Ethylene Insensitive 3- Like 1 and 2 (EIL1 and EIL2) homologous. Transcripts of ERS2, CTR1 and EIL1 were constitutively expressed in all species both throughout flower development and in response to ethylene. In contrast, EIL2 was found only in Cf and Cm. We identified a natural mutation in Cmeil2 causing a frameshift which resulted in difference in expression levels of EIL2, with more than 100-fold change between Cf and Cm in young flowers. CONCLUSIONS This study shows that the naturally occurring 7 bp frameshift discovered in Cmeil2, a key gene in the ethylene signaling pathway, correlates with ethylene insensitivity in flowers. We suggest that transfer of the eil2 mutation to other plant species will provide a novel tool to engineer ethylene insensitive flowers.
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Affiliation(s)
- Line Jensen
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Højbakkegård Allé 9-13, 2630 Taastrup, Denmark
| | - Josefine Nymark Hegelund
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Højbakkegård Allé 9-13, 2630 Taastrup, Denmark
| | - Andreas Olsen
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Højbakkegård Allé 9-13, 2630 Taastrup, Denmark
| | - Henrik Lütken
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Højbakkegård Allé 9-13, 2630 Taastrup, Denmark
| | - Renate Müller
- Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Højbakkegård Allé 9-13, 2630 Taastrup, Denmark
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96
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Winterhagen P, Hagemann MH, Wünsche JN. Expression and interaction of the mango ethylene receptor MiETR1 and different receptor versions of MiERS1. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2016; 246:26-36. [PMID: 26993233 DOI: 10.1016/j.plantsci.2016.02.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 01/19/2016] [Accepted: 02/10/2016] [Indexed: 06/05/2023]
Abstract
Different versions of the mango ethylene receptor MiERS1 were identified and the analysis indicates that, in addition to MiERS1, two short versions of this receptor (MiERS1m, MiERS1s), representing truncated proteins with central deletions of functional domains, are present in mango. The short receptor versions reveal a different expression pattern compared to MiERS1, and they are highly variably transcribed. With transient expression assays using fluorescent fusion proteins, the localisation and the interaction of the receptors were determined in leaf cells of the tobacco model. MiERS1, MiETR1, and the short MiERS1 receptor versions are anchored in the endoplasmic reticulum (ER) membrane and co-localise with each other and with an ER-marker. Furthermore, ectopic expression of the mango receptors appears to induce a re-organisation of the ER resulting in accumulation of ER bodies. Interaction assays suggest that both short MiERS1 receptor versions can bind to proteins located in the ER. Bi-molecular fluorescence complementation (BiFC) assays indicate, that MiERS1m may dimerise with itself and can also interact with MiERS1, but not with MiETR1. Further, it as found that MiETR1 can interact with MiERS1. Interaction of MiERS1s with the other ethylene receptors could not be detected, although it was located in the ER membrane system.
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Affiliation(s)
- Patrick Winterhagen
- University of Hohenheim, Institute of Crop Science, Crop Physiology of Specialty Crops, Stuttgart, Germany.
| | - Michael H Hagemann
- University of Hohenheim, Institute of Crop Science, Crop Physiology of Specialty Crops, Stuttgart, Germany
| | - Jens N Wünsche
- University of Hohenheim, Institute of Crop Science, Crop Physiology of Specialty Crops, Stuttgart, Germany
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97
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Poulios S, Vlachonasios KE. Synergistic action of histone acetyltransferase GCN5 and receptor CLAVATA1 negatively affects ethylene responses in Arabidopsis thaliana. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:905-18. [PMID: 26596766 DOI: 10.1093/jxb/erv503] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
GENERAL CONTROL NON-REPRESSIBLE 5 (GCN5) is a histone acetyltransferase (HAT) and the catalytic subunit of several multicomponent HAT complexes that acetylate lysine residues of histone H3. Mutants in AtGCN5 display pleiotropic developmental defects including aberrant meristem function. Shoot apical meristem (SAM) maintenance is regulated by CLAVATA1 (CLV1), a receptor kinase that controls the size of the shoot and floral meristems. Upon activation through CLV3 binding, CLV1 signals to the transcription factor WUSCHEL (WUS), restricting WUS expression and thus the meristem size. We hypothesized that GCN5 and CLV1 act together to affect SAM function. Using genetic and molecular approaches, we generated and characterized clv gcn5 mutants. Surprisingly, the clv1-1 gcn5-1 double mutant exhibited constitutive ethylene responses, suggesting that GCN5 and CLV signaling act synergistically to inhibit ethylene responses in Arabidopsis. This genetic and molecular interaction was mediated by ETHYLENE INSENSITIVE 3/ EIN3-LIKE1 (EIN3/EIL1) transcription factors. Our data suggest that signals from the CLV transduction pathway reach the GCN5-containing complexes in the nucleus and alter the histone acetylation status of ethylene-responsive genes, thus translating the CLV information to transcriptional activity and uncovering a link between histone acetylation and SAM maintenance in the complex mode of ethylene signaling.
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Affiliation(s)
- Stylianos Poulios
- Department of Botany, School of Biology, Faculty of Science, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Konstantinos E Vlachonasios
- Department of Botany, School of Biology, Faculty of Science, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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98
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Pekárová B, Szmitkowska A, Dopitová R, Degtjarik O, Žídek L, Hejátko J. Structural Aspects of Multistep Phosphorelay-Mediated Signaling in Plants. MOLECULAR PLANT 2016; 9:71-85. [PMID: 26633861 DOI: 10.1016/j.molp.2015.11.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 11/17/2015] [Accepted: 11/18/2015] [Indexed: 05/16/2023]
Abstract
The multistep phosphorelay (MSP) is a central signaling pathway in plants integrating a wide spectrum of hormonal and environmental inputs and controlling numerous developmental adaptations. For the thorough comprehension of the molecular mechanisms underlying the MSP-mediated signal recognition and transduction, the detailed structural characterization of individual members of the pathway is critical. In this review we describe and discuss the recently known crystal and nuclear magnetic resonance structures of proteins acting in MSP signaling in higher plants, focusing particularly on cytokinin and ethylene signaling in Arabidopsis thaliana. We discuss the range of functional aspects of available structural information including determination of ligand specificity, activation of the receptor via its autophosphorylation, and downstream signal transduction through the phosphorelay. We compare the plant structures with their bacterial counterparts and show that although the overall similarity is high, the differences in structural details are frequent and functionally important. Finally, we discuss emerging knowledge on molecular recognition mechanisms in the MSP, and mention the latest findings regarding structural determinants of signaling specificity in the Arabidopsis MSP that could serve as a general model of this pathway in all higher plants.
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Affiliation(s)
- Blanka Pekárová
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Agnieszka Szmitkowska
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Radka Dopitová
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Oksana Degtjarik
- Faculty of Science, Institute of Chemistry and Biochemistry, University of South Bohemia, 370 05 České Budějovice, Czech Republic
| | - Lukáš Žídek
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Jan Hejátko
- Central European Institute of Technology (CEITEC), Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.
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99
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Liu X, Liu Y, Liu C, Guan M, Yang C. Identification of genes associated with male sterility in a mutant of white birch (Betula platyphylla Suk.). Gene 2015; 574:247-54. [PMID: 26260014 DOI: 10.1016/j.gene.2015.08.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 07/18/2015] [Accepted: 08/06/2015] [Indexed: 11/15/2022]
Abstract
White birch (Betula platyphylla Suk.) is a monoecious tree species with unisexual flowers. In this study, we used a spontaneous mutant genotype that produced normal-like male (NLM) inflorescences and mutant male (MM) inflorescences at different locations within the tree to investigate the genes necessary for pollen development. A cDNA-amplified fragment length polymorphism (cDNA-AFLP) analysis was used to identify genes differentially expressed between the two types of inflorescences. Of approximately 5000 transcript-derived fragments (TDFs) obtained, 323 were significantly differentially expressed, of which 141 were successfully sequenced. BLAST analyses revealed 51.8% of the sequenced TDFs showed significant homology with proteins of known or predicted functions, 10.6% showed significant homology with putative proteins without any known or predicted function, and the remaining 37.6% had no hits in the NCBI database. Further, in a functional categorization based on the BLAST analyses, the protein fate, metabolism, energy categories had in order the highest percentages of the proteins. A Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis showed that the known TDFs were mainly involved in metabolic (28.4%), signal transduction (23.5%) and folding, sorting and degradation (13.6%) pathways. Ten genes from the NLM and MM development stages in the mutant were analyzed by quantitative real-time reverse transcriptase-polymerase chain reaction (qRT-PCR). The information generated in this study can provide some useful clues to help understand male sterility in B. platyphylla.
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Affiliation(s)
- Xuemei Liu
- Northeast Forestry University, Harbin 150040, PR China
| | - Ying Liu
- Forestry Investigation and Planning Institute of Liaoning Province, Shenyang 110122, PR China
| | - Chuang Liu
- Northeast Forestry University, Harbin 150040, PR China
| | - Minxiao Guan
- Northeast Forestry University, Harbin 150040, PR China
| | - Chuanping Yang
- State Key Laboratory of Forest Genetics and Tree Breeding, Northeast Forestry University, Harbin 150040, PR China.
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100
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Xie W, Huang J, Liu Y, Rao J, Luo D, He M. Exploring potential new floral organ morphogenesis genes of Arabidopsis thaliana using systems biology approach. FRONTIERS IN PLANT SCIENCE 2015; 6:829. [PMID: 26528302 PMCID: PMC4602108 DOI: 10.3389/fpls.2015.00829] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Accepted: 09/22/2015] [Indexed: 05/24/2023]
Abstract
Flowering is one of the important defining features of angiosperms. The initiation of flower development and the formation of different floral organs are the results of the interplays among numerous genes. But until now, just fewer genes have been found linked with flower development. And the functions of lots of genes of Arabidopsis thaliana are still unknown. Although, the quartet model successfully simplified the ABCDE model to elaborate the molecular mechanism by introducing protein-protein interactions (PPIs). We still don't know much about several important aspects of flower development. So we need to discriminate even more genes involving in the flower development. In this study, we identified seven differentially modules through integrating the weighted gene co-expression network analysis (WGCNA) and Support Vector Machine (SVM) method to analyze co-expression network and PPIs using the public floral and non-floral expression profiles data of Arabidopsis thaliana. Gene set enrichment analysis was used for the functional annotation of the related genes, and some of the hub genes were identified in each module. The potential floral organ morphogenesis genes of two significant modules were integrated with PPI information in order to detail the inherent regulation mechanisms. Finally, the functions of the floral patterning genes were elucidated by combining the PPI and evolutionary information. It was indicated that the sub-networks or complexes, rather than the genes, were the regulation unit of flower development. We found that the most possible potential new genes underlining the floral pattern formation in A. thaliana were FY, CBL2, ZFN3, and AT1G77370; among them, FY, CBL2 acted as an upstream regulator of AP2; ZFN3 activated the flower primordial determining gene AP1 and AP2 by HY5/HYH gene via photo induction possibly. And AT1G77370 exhibited similar function in floral morphogenesis, same as ELF3. It possibly formed a complex between RFC3 and RPS15 in cytoplasm, which regulated TSO1 and CPSF160 in the nucleus, to control the floral organ morphogenesis. This process might also be fine tuning by AT5G53360 in the nucleus.
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Affiliation(s)
| | | | | | | | - Da Luo
- *Correspondence: Da Luo and Miao He, School of Life Sciences, Sun Yat-sen University, No. 135 West Xingang RD, Guangzhou 510275, Guangdong, China ;
| | - Miao He
- *Correspondence: Da Luo and Miao He, School of Life Sciences, Sun Yat-sen University, No. 135 West Xingang RD, Guangzhou 510275, Guangdong, China ;
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