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Yuan G, Nong T, Hunpatin OS, Shi C, Su X, Wang Q, Liu H, Dai P, Ning Y. Research Progress on Plant Shaker K + Channels. PLANTS (BASEL, SWITZERLAND) 2024; 13:1423. [PMID: 38794493 PMCID: PMC11125005 DOI: 10.3390/plants13101423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 05/16/2024] [Accepted: 05/16/2024] [Indexed: 05/26/2024]
Abstract
Plant growth and development are driven by intricate processes, with the cell membrane serving as a crucial interface between cells and their external environment. Maintaining balance and signal transduction across the cell membrane is essential for cellular stability and a host of life processes. Ion channels play a critical role in regulating intracellular ion concentrations and potentials. Among these, K+ channels on plant cell membranes are of paramount importance. The research of Shaker K+ channels has become a paradigm in the study of plant ion channels. This study offers a comprehensive overview of advancements in Shaker K+ channels, including insights into protein structure, function, regulatory mechanisms, and research techniques. Investigating Shaker K+ channels has enhanced our understanding of the regulatory mechanisms governing ion absorption and transport in plant cells. This knowledge offers invaluable guidance for enhancing crop yields and improving resistance to environmental stressors. Moreover, an extensive review of research methodologies in Shaker K+ channel studies provides essential reference solutions for researchers, promoting further advancements in ion channel research.
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Affiliation(s)
- Guang Yuan
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Tongjia Nong
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Oluwaseyi Setonji Hunpatin
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Chuhan Shi
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xiaoqing Su
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Qian Wang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
| | - Haobao Liu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
| | - Peigang Dai
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
| | - Yang Ning
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, China
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Nieves-Cordones M, Amo J, Hurtado-Navarro L, Martínez-Martínez A, Martínez V, Rubio F. Inhibition of SlSKOR by SlCIPK23-SlCBL1/9 uncovers CIPK-CBL-target network rewiring in land plants. THE NEW PHYTOLOGIST 2023; 238:2495-2511. [PMID: 36967582 DOI: 10.1111/nph.18910] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 03/19/2023] [Indexed: 05/19/2023]
Abstract
Transport of K+ to the xylem is a key process in the mineral nutrition of the shoots. Although CIPK-CBL complexes have been widely shown to regulate K+ uptake transport systems, no information is available about the xylem ones. Here, we studied the physiological roles of the voltage-gated K+ channel SlSKOR and its regulation by the SlCIPK23-SlCBL1/9 complexes in tomato plants. We phenotyped gene-edited slskor and slcipk23 tomato knockout mutants and carried out two-electrode voltage-clamp (TEVC) and BiFC assays in Xenopus oocytes as key approaches. SlSKOR was preferentially expressed in the root stele and was important not only for K+ transport to shoots but also, indirectly, for that of Ca2+ , Mg2+ , Na+ , NO3 - , and Cl- . Surprisingly, the SlCIPK23-SlCBL1/9 complexes turned out to be negative regulators of SlSKOR. Inhibition of SlSKOR by SlCIPK23-SlCBL1/9 was observed in Xenopus oocytes and tomato plants. Regulation of SKOR-like channels by CIPK23-CBL1 complexes was also present in Medicago, grapevine, and lettuce but not in Arabidopsis and saltwater cress. Our results provide a molecular framework for coordinating root K+ uptake and its translocation to the shoot by SlCIPK23-SlCBL1/9 in tomato plants. Moreover, they evidenced that CIPK-CBL-target networks have evolved differently in land plants.
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Affiliation(s)
- Manuel Nieves-Cordones
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, 30100, Spain
| | - Jesús Amo
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, 30100, Spain
| | - Laura Hurtado-Navarro
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, 30100, Spain
| | - Almudena Martínez-Martínez
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, 30100, Spain
| | - Vicente Martínez
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, 30100, Spain
| | - Francisco Rubio
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, 30100, Spain
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Nieves-Cordones M, Azeem F, Long Y, Boeglin M, Duby G, Mouline K, Hosy E, Vavasseur A, Chérel I, Simonneau T, Gaymard F, Leung J, Gaillard I, Thibaud JB, Véry AA, Boudaoud A, Sentenac H. Non-autonomous stomatal control by pavement cell turgor via the K+ channel subunit AtKC1. THE PLANT CELL 2022; 34:2019-2037. [PMID: 35157082 PMCID: PMC9048897 DOI: 10.1093/plcell/koac038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Accepted: 01/28/2022] [Indexed: 05/27/2023]
Abstract
Stomata optimize land plants' photosynthetic requirements and limit water vapor loss. So far, all of the molecular and electrical components identified as regulating stomatal aperture are produced, and operate, directly within the guard cells. However, a completely autonomous function of guard cells is inconsistent with anatomical and biophysical observations hinting at mechanical contributions of epidermal origins. Here, potassium (K+) assays, membrane potential measurements, microindentation, and plasmolysis experiments provide evidence that disruption of the Arabidopsis thaliana K+ channel subunit gene AtKC1 reduces pavement cell turgor, due to decreased K+ accumulation, without affecting guard cell turgor. This results in an impaired back pressure of pavement cells onto guard cells, leading to larger stomatal apertures. Poorly rectifying membrane conductances to K+ were consistently observed in pavement cells. This plasmalemma property is likely to play an essential role in K+ shuttling within the epidermis. Functional complementation reveals that restoration of the wild-type stomatal functioning requires the expression of the transgenic AtKC1 at least in the pavement cells and trichomes. Altogether, the data suggest that AtKC1 activity contributes to the building of the back pressure that pavement cells exert onto guard cells by tuning K+ distribution throughout the leaf epidermis.
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Affiliation(s)
| | | | | | - Martin Boeglin
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier 34060, France
| | - Geoffrey Duby
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier 34060, France
| | - Karine Mouline
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier 34060, France
| | | | - Alain Vavasseur
- CEA Cadarache DSV DEVM LEMS UMR 163, CNRS/CEA, F-13108 St Paul Lez Durance, France
| | - Isabelle Chérel
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier 34060, France
| | - Thierry Simonneau
- INRA Laboratoire d’Ecophysiologie des Plantes sous Stress Environnementaux, Place Viala, 2, F-34060 Montpellier Cedex 1, France
| | - Frédéric Gaymard
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier 34060, France
| | - Jeffrey Leung
- Université Paris-Saclay, INRAE, AgroParisTech, CNRS, Institut Jean-Pierre Bourgin (IJPB), 78000 Versailles, France
| | - Isabelle Gaillard
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier 34060, France
| | - Jean-Baptiste Thibaud
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier 34060, France
- Institut des biomolécules Max Mousseron (UMR 5247 CNRS-UM-ENSCM) Campus CNRS, 1919 route de Mende, F-34293 Montpellier Cedex 05, France
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Azeem F, Zameer R, Rehman Rashid MA, Rasul I, Ul-Allah S, Siddique MH, Fiaz S, Raza A, Younas A, Rasool A, Ali MA, Anwar S, Siddiqui MH. Genome-wide analysis of potassium transport genes in Gossypium raimondii suggest a role of GrHAK/KUP/KT8, GrAKT2.1 and GrAKT1.1 in response to abiotic stress. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2022; 170:110-122. [PMID: 34864561 DOI: 10.1016/j.plaphy.2021.11.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/22/2021] [Accepted: 11/23/2021] [Indexed: 06/13/2023]
Abstract
Potassium (K+) is an important macro-nutrient for plants, which comprises almost 10% of plant's dry mass. It plays a crucial role in the growth of plants as well as other important processes related to metabolism and stress tolerance. Plants have a complex and well-organized potassium distribution system (channels and transporters). Cotton is the most important economic crop, which is the primary source of natural fiber. Soil deficiency in K+ can negatively affect yield and fiber quality of cotton. However, potassium transport system in cotton is poorly studied. Current study identified 43 Potassium Transport System (PTS) genes in Gossypium raimondii genome. Based on conserved domains, transmembrane domains, and motif structures, these genes were classified as K+ transporters (2 HKTs, 7 KEAs, and 16 KUP/HAK/KTs) and K+ channels (11 Shakers and 7 TPKs/KCO). The phylogenetic comparison of GrPTS genes from Arabidopsis thaliana, Glycine max, Oryza sativa, Medicago truncatula and Cicer arietinum revealed variations in PTS gene conservation. Evolutionary analysis predicted that most GrPTS genes were segmentally duplicated. Gene structure analysis showed that the intron/exon organization of these genes was conserved in specific-family. Chromosomal localization demonstrated a random distribution of PTS genes across all the thirteen chromosomes except chromosome six. Many stress responsive cis-regulatory elements were predicted in promoter regions of GrPTS genes. The RNA-seq data analysis followed by qRT-PCR validation demonstrated that PTS genes potentially work in groups against environmental factors. Moreover, a transporter gene (GrHAK/KUP/KT8) and two channel genes (GrAKT2.1 and GrAKT1.1) are important candidate genes for plant stress response. These results provide useful information for further functional characterization of PTS genes with the breeding aim of stress-resistant cultivars.
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Affiliation(s)
- Farrukh Azeem
- Department of Bioinformatics and Biotechnology, Govt. College University, Faisalabad, Pakistan
| | - Roshan Zameer
- Department of Bioinformatics and Biotechnology, Govt. College University, Faisalabad, Pakistan
| | | | - Ijaz Rasul
- Department of Bioinformatics and Biotechnology, Govt. College University, Faisalabad, Pakistan
| | - Sami Ul-Allah
- College of Agriculture, Bahauddin Zakariya University, Bahadur Sub-Campus, Layyah, Pakistan
| | | | - Sajid Fiaz
- Department of Plant Breeding and Genetics, The University of Haripur, 22620, Haripir, Pakistan.
| | - Ali Raza
- Fujian Provincial Key Laboratory of Crop Molecular and Cell Biology, Oil Crops Research Institute, Center of Legume Crop Genetics and Systems Biology/College of Agriculture, Fujian Agriculture and Forestry University (FAFU), Fuzhou, Fujian, 350002, China
| | - Afifa Younas
- Department of Botany, Lahore College for Women University, Lahore, Pakistan
| | - Asima Rasool
- Department of Bioinformatics and Biotechnology, Govt. College University, Faisalabad, Pakistan
| | - Muhammad Amjad Ali
- Department of Plant Pathology, University of Agriculture, Faisalabad, Pakistan
| | - Sultana Anwar
- Department of Agronomy, University of Florida, Gainesville, USA
| | - Manzer H Siddiqui
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
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Azeem F, Ijaz U, Ali MA, Hussain S, Zubair M, Manzoor H, Abid M, Zameer R, Kim DS, Golokhvast KS, Chung G, Sun S, Nawaz MA. Genome-Wide Identification and Expression Profiling of Potassium Transport-Related Genes in Vigna radiata under Abiotic Stresses. PLANTS (BASEL, SWITZERLAND) 2021; 11:2. [PMID: 35009006 PMCID: PMC8747342 DOI: 10.3390/plants11010002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/25/2021] [Accepted: 12/10/2021] [Indexed: 06/14/2023]
Abstract
Potassium (K+) is one of the most important cations that plays a significant role in plants and constitutes up to 10% of plants' dry weight. Plants exhibit complex systems of transporters and channels for the distribution of K+ from soil to numerous parts of plants. In this study, we have identified 39 genes encoding putative K+ transport-related genes in Vigna radiata. Chromosomal mapping of these genes indicated an uneven distribution across eight out of 11 chromosomes. Comparative phylogenetic analysis of different plant species, i.e., V. radiata, Glycine max, Cicer arietinum, Oryza sativa, and Arabidopsis thaliana, showed their strong conservation in different plant species. Evolutionary analysis of these genes suggests that gene duplication is a major route of expansion for this family in V. radiata. Comprehensive promoter analysis identified several abiotic stresses related to cis-elements in the promoter regions of these genes, suggesting their role in abiotic stress tolerance. Our additional analyses indicated that abiotic stresses adversely affected the chlorophyll concentration, carotenoids, catalase, total soluble protein concentration, and the activities of superoxide and peroxidase in V. radiata. It also disturbs the ionic balance by decreasing the uptake of K+ content and increasing the uptake of Na+. Expression analysis from high-throughput sequencing data and quantitative real-time PCR experiments revealed that several K+ transport genes were expressed in different tissues (seed, flower, and pod) and in abiotic stress-responsive manners. A highly significant variation of expression was observed for VrHKT (1.1 and 1.2), VrKAT (1 and 2) VrAKT1.1, VrAKT2, VrSKOR, VrKEA5, VrTPK3, and VrKUP/HAK/KT (4, 5, and 8.1) in response to drought, heat or salinity stress. It reflected their potential roles in plant growth, development, or stress adaptations. The present study gives an in-depth understanding of K+ transport system genes in V. radiata and will serve as a basis for a functional analysis of these genes.
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Affiliation(s)
- Farrukh Azeem
- Department of Bioinformatics and Biotechnology, GC University, Faisalabad 38000, Pakistan; (F.A.); (U.I.); (M.Z.); (R.Z.)
| | - Usman Ijaz
- Department of Bioinformatics and Biotechnology, GC University, Faisalabad 38000, Pakistan; (F.A.); (U.I.); (M.Z.); (R.Z.)
| | - Muhammad Amjad Ali
- Department of Plant Pathology, University of Agriculture, Faisalabad 38000, Pakistan;
| | - Sabir Hussain
- Department of Environmental Science and Engineering, GC University, Faisalabad 38000, Pakistan;
| | - Muhammad Zubair
- Department of Bioinformatics and Biotechnology, GC University, Faisalabad 38000, Pakistan; (F.A.); (U.I.); (M.Z.); (R.Z.)
| | - Hamid Manzoor
- Institute of Molecular Biology & Biotechnology, Bahauddin Zakariya University, Multan 60800, Pakistan;
| | - Muhammad Abid
- Department of Plant Pathology, Bahauddin Zakariya University, Multan 60800, Pakistan;
| | - Roshan Zameer
- Department of Bioinformatics and Biotechnology, GC University, Faisalabad 38000, Pakistan; (F.A.); (U.I.); (M.Z.); (R.Z.)
| | - Dong-Seon Kim
- KM Research Science Division, Korea Institute of Oriental Medicine (KIOM), Daejeon 34054, Korea;
| | - Kirill S. Golokhvast
- N.I. Vavilov All-Russian Research Institute of Plant Genetic Resources, 190000 Saint Petersburg, Russia;
- SEC in Nanotechnology, Engineering School, Far Eastern Federal University, 690922 Vladivostok, Russia
- Siberian Federal Scientific Center of Agrobiotechnology, Russian Academy of Sciences, Krasnoobsk, 630501 Novosibirsk, Russia
| | - Gyuhwa Chung
- Department of Biotechnology, Chonnam National University, Yeosu Campus, Gwangju 52626, Korea;
| | - Sangmi Sun
- Department of Biotechnology, Chonnam National University, Yeosu Campus, Gwangju 52626, Korea;
| | - Muhammad Amjad Nawaz
- Siberian Federal Scientific Center of Agrobiotechnology, Russian Academy of Sciences, Krasnoobsk, 630501 Novosibirsk, Russia
- Laboratory of Supercritical Fluid Research and Application in Agrobiotechnology, The National Research Tomsk State University, 36, Lenin Avenue, 634050 Tomsk, Russia
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Amo J, Lara A, Martínez-Martínez A, Martínez V, Rubio F, Nieves-Cordones M. The protein kinase SlCIPK23 boosts K + and Na + uptake in tomato plants. PLANT, CELL & ENVIRONMENT 2021; 44:3589-3605. [PMID: 34545584 DOI: 10.1111/pce.14189] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 09/11/2021] [Accepted: 09/12/2021] [Indexed: 06/13/2023]
Abstract
Regulation of root transport systems is essential under fluctuating nutrient supply. In the case of potassium (K+ ), HAK/KUP/KT K+ transporters and voltage-gated K+ channels ensure root K+ uptake in a wide range of K+ concentrations. In Arabidopsis, the CIPK23/CBL1-9 complex regulates both transporter- and channel-mediated root K+ uptake. However, research about K+ homeostasis in crops is in demand due to species-specific mechanisms. In the present manuscript, we studied the contribution of the voltage-gated K+ channel LKT1 and the protein kinase SlCIPK23 to K+ uptake in tomato plants by analysing gene-edited knockout tomato mutant lines, together with two-electrode voltage-clamp experiments in Xenopus oocytes and protein-protein interaction analyses. It is shown that LKT1 is a crucial player in tomato K+ nutrition by contributing approximately 50% to root K+ uptake under K+ -sufficient conditions. Moreover, SlCIPK23 was responsible for approximately 100% of LKT1 and approximately 40% of the SlHAK5 K+ transporter activity in planta. Mg+2 and Na+ compensated for K+ deficit in tomato roots to a large extent, and the accumulation of Na+ was strongly dependent on SlCIPK23 function. The role of CIPK23 in Na+ accumulation in tomato roots was not conserved in Arabidopsis, which expands the current set of CIPK23-like protein functions in plants.
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Affiliation(s)
- Jesús Amo
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, Spain
| | - Alberto Lara
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, Spain
| | - Almudena Martínez-Martínez
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, Spain
| | - Vicente Martínez
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, Spain
| | - Francisco Rubio
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, Spain
| | - Manuel Nieves-Cordones
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Murcia, Spain
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Monder H, Maillard M, Chérel I, Zimmermann SD, Paris N, Cuéllar T, Gaillard I. Adjustment of K + Fluxes and Grapevine Defense in the Face of Climate Change. Int J Mol Sci 2021; 22:10398. [PMID: 34638737 PMCID: PMC8508874 DOI: 10.3390/ijms221910398] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/18/2021] [Accepted: 09/20/2021] [Indexed: 12/18/2022] Open
Abstract
Grapevine is one of the most economically important fruit crops due to the high value of its fruit and its importance in winemaking. The current decrease in grape berry quality and production can be seen as the consequence of various abiotic constraints imposed by climate changes. Specifically, produced wines have become too sweet, with a stronger impression of alcohol and fewer aromatic qualities. Potassium is known to play a major role in grapevine growth, as well as grape composition and wine quality. Importantly, potassium ions (K+) are involved in the initiation and maintenance of the berry loading process during ripening. Moreover, K+ has also been implicated in various defense mechanisms against abiotic stress. The first part of this review discusses the main negative consequences of the current climate, how they disturb the quality of grape berries at harvest and thus ultimately compromise the potential to obtain a great wine. In the second part, the essential electrical and osmotic functions of K+, which are intimately dependent on K+ transport systems, membrane energization, and cell K+ homeostasis, are presented. This knowledge will help to select crops that are better adapted to adverse environmental conditions.
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Affiliation(s)
- Houssein Monder
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, F-34060 Montpellier, France; (H.M.); (M.M.); (I.C.); (S.D.Z.); (N.P.)
| | - Morgan Maillard
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, F-34060 Montpellier, France; (H.M.); (M.M.); (I.C.); (S.D.Z.); (N.P.)
| | - Isabelle Chérel
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, F-34060 Montpellier, France; (H.M.); (M.M.); (I.C.); (S.D.Z.); (N.P.)
| | - Sabine Dagmar Zimmermann
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, F-34060 Montpellier, France; (H.M.); (M.M.); (I.C.); (S.D.Z.); (N.P.)
| | - Nadine Paris
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, F-34060 Montpellier, France; (H.M.); (M.M.); (I.C.); (S.D.Z.); (N.P.)
| | - Teresa Cuéllar
- CIRAD, UMR AGAP, Univ Montpellier, INRAE, Institut Agro, F-34398 Montpellier, France;
| | - Isabelle Gaillard
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, F-34060 Montpellier, France; (H.M.); (M.M.); (I.C.); (S.D.Z.); (N.P.)
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8
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Ródenas R, Ragel P, Nieves-Cordones M, Martínez-Martínez A, Amo J, Lara A, Martínez V, Quintero FJ, Pardo JM, Rubio F. Insights into the mechanisms of transport and regulation of the arabidopsis high-affinity K+ transporter HAK51. PLANT PHYSIOLOGY 2021; 185:1860-1874. [PMID: 33595056 PMCID: PMC8133630 DOI: 10.1093/plphys/kiab028] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 01/11/2021] [Indexed: 05/02/2023]
Abstract
The high-affinity K+ transporter HAK5 from Arabidopsis (Arabidopsis thaliana) is essential for K+ acquisition and plant growth at low micromolar K+ concentrations. Despite its functional relevance in plant nutrition, information about functional domains of HAK5 is scarce. Its activity is enhanced by phosphorylation via the AtCIPK23/AtCBL1-9 complex. Based on the recently published three-dimensionalstructure of the bacterial ortholog KimA from Bacillus subtilis, we have modeled AtHAK5 and, by a mutational approach, identified residues G67, Y70, G71, D72, D201, and E312 as essential for transporter function. According to the structural model, residues D72, D201, and E312 may bind K+, whereas residues G67, Y70, and G71 may shape the selective filter for K+, which resembles that of K+shaker-like channels. In addition, we show that phosphorylation of residue S35 by AtCIPK23 is required for reaching maximal transport activity. Serial deletions of the AtHAK5 C-terminus disclosed the presence of an autoinhibitory domain located between residues 571 and 633 together with an AtCIPK23-dependent activation domain downstream of position 633. Presumably, autoinhibition of AtHAK5 is counteracted by phosphorylation of S35 by AtCIPK23. Our results provide a molecular model for K+ transport and describe CIPK-CBL-mediated regulation of plant HAK transporters.
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Affiliation(s)
- Reyes Ródenas
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Científicas, Campus de Espinardo, 30100 Murcia, Spain
- Present address: Plant Science Research Laboratory (LRSV), UMR5546 CNRS/Université Toulouse 3, 24 chemin de Borde Rouge, 31320 Auzeville-Tolosane, France
| | - Paula Ragel
- Instituto de Bioquímica Vegetal y Fotosíntesis, cic-Cartuja, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, 41092 Sevilla, Spain
- Present address: Centre for Organismal Studies (COS), Department of Cell Biology, Heidelberg University, Heidelberg, Germany
| | - Manuel Nieves-Cordones
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Científicas, Campus de Espinardo, 30100 Murcia, Spain
| | - Almudena Martínez-Martínez
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Científicas, Campus de Espinardo, 30100 Murcia, Spain
| | - Jesús Amo
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Científicas, Campus de Espinardo, 30100 Murcia, Spain
| | - Alberto Lara
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Científicas, Campus de Espinardo, 30100 Murcia, Spain
| | - Vicente Martínez
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Científicas, Campus de Espinardo, 30100 Murcia, Spain
| | - Francisco J Quintero
- Instituto de Bioquímica Vegetal y Fotosíntesis, cic-Cartuja, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, 41092 Sevilla, Spain
| | - Jose M Pardo
- Instituto de Bioquímica Vegetal y Fotosíntesis, cic-Cartuja, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, 41092 Sevilla, Spain
| | - Francisco Rubio
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Científicas, Campus de Espinardo, 30100 Murcia, Spain
- Author for communication:
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9
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Jarratt-Barnham E, Wang L, Ning Y, Davies JM. The Complex Story of Plant Cyclic Nucleotide-Gated Channels. Int J Mol Sci 2021; 22:ijms22020874. [PMID: 33467208 PMCID: PMC7830781 DOI: 10.3390/ijms22020874] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 01/14/2021] [Accepted: 01/15/2021] [Indexed: 12/25/2022] Open
Abstract
Plant cyclic nucleotide-gated channels (CNGCs) are tetrameric cation channels which may be activated by the cyclic nucleotides (cNMPs) adenosine 3',5'-cyclic monophosphate (cAMP) and guanosine 3',5'-cyclic monophosphate (cGMP). The genome of Arabidopsis thaliana encodes 20 CNGC subunits associated with aspects of development, stress response and immunity. Recently, it has been demonstrated that CNGC subunits form heterotetrameric complexes which behave differently from the homotetramers produced by their constituent subunits. These findings have widespread implications for future signalling research and may help explain how specificity can be achieved by CNGCs that are known to act in disparate pathways. Regulation of complex formation may involve cyclic nucleotide-gated channel-like proteins.
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10
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Channels and transporters for inorganic ions in plant mitochondria: Prediction and facts. Mitochondrion 2020; 53:224-233. [PMID: 32540403 DOI: 10.1016/j.mito.2020.05.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 05/01/2020] [Accepted: 05/22/2020] [Indexed: 02/07/2023]
Abstract
Mitochondria are crucial bioenergetic organelles for providing different metabolites, including ATP, to sustain cell growth both in animals and in plants. These organelles, delimited by two membranes (outer and inner mitochondrial membrane), maintain their function by an intensive communication with other organelles as well as with the cytosol. Transport of metabolites across the two membranes, but also that of inorganic ions, takes place through specific ion channels and transporters and plays a crucial role in ensuring an adequate ionic milieu within the mitochondria. In the present review we briefly summarize the current knowledge about plant mitochondrial ion channels and transporters in comparison to those of animal mitochondria and examine the possible molecular identity of the so far unidentified transport systems taking into account subcellular targeting predictions and data from literature.
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11
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Drain A, Thouin J, Wang L, Boeglin M, Pauly N, Nieves-Cordones M, Gaillard I, Véry AA, Sentenac H. Functional characterization and physiological roles of the single Shaker outward K + channel in Medicago truncatula. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 102:1249-1265. [PMID: 31958173 DOI: 10.1111/tpj.14697] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 11/29/2019] [Accepted: 12/13/2019] [Indexed: 06/10/2023]
Abstract
The model legume Medicago truncatula possesses a single outward Shaker K+ channel, whereas Arabidopsis thaliana possesses two channels of this type, named AtSKOR and AtGORK, with AtSKOR having been shown to play a major role in K+ secretion into the xylem sap in the root vasculature and with AtGORK being shown to mediate the efflux of K+ across the guard cell membrane, leading to stomatal closure. Here we show that the expression pattern of the single M. truncatula outward Shaker channel, which has been named MtGORK, includes the root vasculature, guard cells and root hairs. As shown by patch-clamp experiments on root hair protoplasts, besides the Shaker-type slowly activating outwardly rectifying K+ conductance encoded by MtGORK, a second K+ -permeable conductance, displaying fast activation and weak rectification, can be expressed by M. truncatula. A knock-out (KO) mutation resulting in an absence of MtGORK activity is shown to weakly reduce K+ translocation to shoots, and only in plants engaged in rhizobial symbiosis, but to strongly affect the control of stomatal aperture and transpirational water loss. In legumes, the early electrical signaling pathway triggered by Nod-factor perception is known to comprise a short transient depolarization of the root hair plasma membrane. In the absence of the functional expression of MtGORK, the rate of the membrane repolarization is found to be decreased by a factor of approximately two. This defect was without any consequence on infection thread development and nodule production in plants grown in vitro, but a decrease in nodule production was observed in plants grown in soil.
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Affiliation(s)
- Alice Drain
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
| | - Julien Thouin
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
| | - Limin Wang
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
| | - Martin Boeglin
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
| | - Nicolas Pauly
- Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, UMR 1355-7254 Institut Sophia Agrobiotech, Université Nice Sophia Antipolis, Sophia Antipolis, France
- Laboratoire des Interactions Plantes-Microorganismes, INRAE, CNRS, Université de Toulouse, Castanet-Tolosan, France
| | - Manuel Nieves-Cordones
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura-CSIC, Apartado de Correos 164, Murcia, 30100, Spain
| | - Isabelle Gaillard
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
| | - Anne-Aliénor Véry
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
| | - Hervé Sentenac
- Biochimie et Physiologie Moléculaire des Plantes, UMR BPMP, Univ Montpellier, CNRS, INRAE, Montpellier SupAgro, Montpellier, 34060, France
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12
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Adem GD, Chen G, Shabala L, Chen ZH, Shabala S. GORK Channel: A Master Switch of Plant Metabolism? TRENDS IN PLANT SCIENCE 2020; 25:434-445. [PMID: 31964604 DOI: 10.1016/j.tplants.2019.12.012] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 11/23/2019] [Accepted: 12/10/2019] [Indexed: 05/18/2023]
Abstract
Potassium regulates a plethora of metabolic and developmental response in plants, and upon exposure to biotic and abiotic stresses a substantial K+ loss occurs from plant cells. The outward-rectifying potassium efflux GORK channels are central to this stress-induced K+ loss from the cytosol. In the mammalian systems, signaling molecules such as gamma-aminobutyric acid, G-proteins, ATP, inositol, and protein phosphatases were shown to operate as ligands controlling many K+ efflux channels. Here we present the evidence that the same molecules may also regulate GORK channels in plants. This mechanism enables operation of the GORK channels as a master switch of the cell metabolism, thus adjusting intracellular K+ homeostasis to altered environmental conditions, to maximize plant adaptive potential.
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Affiliation(s)
- Getnet D Adem
- Tasmanian Institute for Agriculture, University of Tasmania, Hobart, TAS 7001, Australia
| | - Guang Chen
- Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China; College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Lana Shabala
- Tasmanian Institute for Agriculture, University of Tasmania, Hobart, TAS 7001, Australia
| | - Zhong-Hua Chen
- School of Science and Health, Western Sydney University, Penrith, NSW 2751, Australia; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2751, Australia.
| | - Sergey Shabala
- Tasmanian Institute for Agriculture, University of Tasmania, Hobart, TAS 7001, Australia; International Research Centre for Environmental Membrane Biology, Foshan University, Foshan 528000, China.
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13
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Lim CW, Kim SH, Choi HW, Luan S, Lee SC. The Shaker Type Potassium Channel, GORK, Regulates Abscisic Acid Signaling in Arabidopsis. THE PLANT PATHOLOGY JOURNAL 2019; 35:684-691. [PMID: 31832048 PMCID: PMC6901251 DOI: 10.5423/ppj.oa.07.2019.0199] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/28/2019] [Accepted: 08/28/2019] [Indexed: 05/25/2023]
Abstract
Evolution of adaptive mechanisms to abiotic stress is essential for plant growth and development. Plants adapt to stress conditions by activating the abscisic acid (ABA) signaling pathway. It has been suggested that the ABA receptor, clade A protein phosphatase, SnRK2 type kinase, and SLAC1 anion channel are important components of the ABA signaling pathway. In this study, we report that the shaker type potassium (K+) channel, GORK, modulates plant responses to ABA and abiotic stresses. Our results indicate that the full length of PP2CA is needed to interact with the GORK C-terminal region. We identified a loss of function allele in gork that displayed ABA-hyposensitive phenotype. gork and pp2ca mutants showed opposite responses to ABA in seed germination and seedling growth. Additionally, gork mutant was tolerant to the NaCl and mannitol treatments, whereas pp2ca mutant was sensitive to the NaCl and mannitol treatments. Thus, our results indicate that GORK enhances the sensitivity to ABA and negatively regulates the mechanisms involved in high salinity and osmotic stresses via PP2CA-mediated signals.
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Affiliation(s)
- Chae Woo Lim
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul 06974, Korea
| | - Sang Hee Kim
- Division of Applied Life Science (BK 21 Plus Program), Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju 52828, Korea
| | - Hyong Woo Choi
- Department of Plant Medicals, Andong National University, Andong 36729, Korea
| | - Sheng Luan
- Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA
| | - Sung Chul Lee
- Department of Life Science (BK21 Program), Chung-Ang University, Seoul 06974, Korea
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14
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Villette J, Cuéllar T, Zimmermann SD, Verdeil JL, Gaillard I. Unique features of the grapevine VvK5.1 channel support novel functions for outward K+ channels in plants. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:6181-6193. [PMID: 31327013 PMCID: PMC6859719 DOI: 10.1093/jxb/erz341] [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: 06/14/2019] [Accepted: 07/15/2019] [Indexed: 05/04/2023]
Abstract
Grapevine (Vitis vinifera L.), one of the most important fruit crops, is a model plant for studying the physiology of fleshy fruits. Here, we report on the characterization of a new grapevine Shaker-type K+ channel, VvK5.1. Phylogenetic analysis revealed that VvK5.1 belongs to the SKOR-like subfamily. Our functional characterization of VvK5.1 in Xenopus oocytes confirms that it is an outwardly rectifying K+ channel that displays strict K+ selectivity. Gene expression level analyses by real-time quantitative PCR showed that VvK5.1 expression was detected in berries, roots, and flowers. In contrast to its Arabidopsis thaliana counterpart that is involved in K+ secretion in the root pericycle, allowing root to shoot K+ translocation, VvK5.1 expression territory is greatly enlarged. Using in situ hybridization we showed that VvK5.1 is expressed in the phloem and perivascular cells of berries and in flower pistil. In the root, in addition to being expressed in the root pericycle like AtSKOR, a strong expression of VvK5.1 is detected in small cells facing the xylem that are involved in lateral root formation. This fine and selective expression pattern of VvK5.1 at the early stage of lateral root primordia supports a role for outward channels to switch on cell division initiation.
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Affiliation(s)
- Jérémy Villette
- BPMP, Université Montpellier, CNRS, INRA, SupAgro, Montpellier, France
| | - Teresa Cuéllar
- CIRAD, UMR AGAP, F-34398 Montpellier, France
- Université Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | | | - Jean-Luc Verdeil
- CIRAD, UMR AGAP, F-34398 Montpellier, France
- Université Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Isabelle Gaillard
- BPMP, Université Montpellier, CNRS, INRA, SupAgro, Montpellier, France
- Correspondence:
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15
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Nieves-Cordones M, Andrianteranagna M, Cuéllar T, Chérel I, Gibrat R, Boeglin M, Moreau B, Paris N, Verdeil JL, Zimmermann S, Gaillard I. Characterization of the grapevine Shaker K + channel VvK3.1 supports its function in massive potassium fluxes necessary for berry potassium loading and pulvinus-actuated leaf movements. THE NEW PHYTOLOGIST 2019; 222:286-300. [PMID: 30735258 DOI: 10.1111/nph.15604] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Accepted: 10/26/2018] [Indexed: 05/13/2023]
Abstract
In grapevine, climate changes lead to increased berry potassium (K+ ) contents that result in must with low acidity. Consequently, wines are becoming 'flat' to the taste, with poor organoleptic properties and low potential aging, resulting in significant economic loss. Precise investigation into the molecular determinants controlling berry K+ accumulation during its development are only now emerging. Here, we report functional characterization by electrophysiology of a new grapevine Shaker-type K+ channel, VvK3.1. The analysis of VvK3.1 expression patterns was performed by qPCR and in situ hybridization. We found that VvK3.1 belongs to the AKT2 channel phylogenetic branch and is a weakly rectifying channel, mediating both inward and outward K+ currents. We showed that VvK3.1 is highly expressed in the phloem and in a unique structure located at the two ends of the petiole, identified as a pulvinus. From the onset of fruit ripening, all data support the role of the VvK3.1 channel in the massive K+ fluxes from the phloem cell cytosol to the berry apoplast during berry K+ loading. Moreover, the high amount of VvK3.1 transcripts detected in the pulvinus strongly suggests a role for this Shaker in the swelling and shrinking of motor cells involved in paraheliotropic leaf movements.
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Affiliation(s)
| | | | - Teresa Cuéllar
- CIRAD, UMR1334 AGAP, PHIV-MRI, 34398, Montpellier Cedex 5, France
| | - Isabelle Chérel
- BPMP, Univ Montpellier, CNRS, INRA, SupAgro, Montpellier, France
| | - Rémy Gibrat
- BPMP, Univ Montpellier, CNRS, INRA, SupAgro, Montpellier, France
| | - Martin Boeglin
- BPMP, Univ Montpellier, CNRS, INRA, SupAgro, Montpellier, France
| | - Bertrand Moreau
- BPMP, Univ Montpellier, CNRS, INRA, SupAgro, Montpellier, France
| | - Nadine Paris
- BPMP, Univ Montpellier, CNRS, INRA, SupAgro, Montpellier, France
| | - Jean-Luc Verdeil
- CIRAD, UMR1334 AGAP, PHIV-MRI, 34398, Montpellier Cedex 5, France
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16
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Ragel P, Raddatz N, Leidi EO, Quintero FJ, Pardo JM. Regulation of K + Nutrition in Plants. FRONTIERS IN PLANT SCIENCE 2019; 10:281. [PMID: 30949187 PMCID: PMC6435592 DOI: 10.3389/fpls.2019.00281] [Citation(s) in RCA: 130] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 02/20/2019] [Indexed: 05/17/2023]
Abstract
Modern agriculture relies on mineral fertilization. Unlike other major macronutrients, potassium (K+) is not incorporated into organic matter but remains as soluble ion in the cell sap contributing up to 10% of the dry organic matter. Consequently, K+ constitutes a chief osmoticum to drive cellular expansion and organ movements, such as stomata aperture. Moreover, K+ transport is critical for the control of cytoplasmic and luminal pH in endosomes, regulation of membrane potential, and enzyme activity. Not surprisingly, plants have evolved a large ensemble of K+ transporters with defined functions in nutrient uptake by roots, storage in vacuoles, and ion translocation between tissues and organs. This review describes critical transport proteins governing K+ nutrition, their regulation, and coordinated activity, and summarizes our current understanding of signaling pathways activated by K+ starvation.
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Affiliation(s)
- Paula Ragel
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
- Centre for Organismal Studies, Universität Heidelberg, Heidelberg, Germany
| | - Natalia Raddatz
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
| | - Eduardo O. Leidi
- Instituto de Recursos Naturales y Agrobiologia de Sevilla, Consejo Superior de Investigaciones Cientificas, Seville, Spain
| | - Francisco J. Quintero
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
| | - José M. Pardo
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
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17
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Ragel P, Raddatz N, Leidi EO, Quintero FJ, Pardo JM. Regulation of K + Nutrition in Plants. FRONTIERS IN PLANT SCIENCE 2019. [PMID: 30949187 DOI: 10.3389/fpls.2019.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Modern agriculture relies on mineral fertilization. Unlike other major macronutrients, potassium (K+) is not incorporated into organic matter but remains as soluble ion in the cell sap contributing up to 10% of the dry organic matter. Consequently, K+ constitutes a chief osmoticum to drive cellular expansion and organ movements, such as stomata aperture. Moreover, K+ transport is critical for the control of cytoplasmic and luminal pH in endosomes, regulation of membrane potential, and enzyme activity. Not surprisingly, plants have evolved a large ensemble of K+ transporters with defined functions in nutrient uptake by roots, storage in vacuoles, and ion translocation between tissues and organs. This review describes critical transport proteins governing K+ nutrition, their regulation, and coordinated activity, and summarizes our current understanding of signaling pathways activated by K+ starvation.
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Affiliation(s)
- Paula Ragel
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
- Centre for Organismal Studies, Universität Heidelberg, Heidelberg, Germany
| | - Natalia Raddatz
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
| | - Eduardo O Leidi
- Instituto de Recursos Naturales y Agrobiologia de Sevilla, Consejo Superior de Investigaciones Cientificas, Seville, Spain
| | - Francisco J Quintero
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
| | - José M Pardo
- Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas y Universidad de Sevilla, Seville, Spain
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18
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Jegla T, Busey G, Assmann SM. Evolution and Structural Characteristics of Plant Voltage-Gated K + Channels. THE PLANT CELL 2018; 30:2898-2909. [PMID: 30389753 PMCID: PMC6354262 DOI: 10.1105/tpc.18.00523] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 10/09/2018] [Accepted: 10/30/2018] [Indexed: 05/18/2023]
Abstract
Plant voltage-gated K+ channels have been referred to as "plant Shakers" in reference to animal Shaker channels, the first K+ channels identified. Recent advances in our knowledge of K+ channel evolution and structure have significantly deepened the divide between these plant and animal K+ channels, suggesting that it is time to completely retire the "plant Shaker" designation. Evolutionary genomics reveals that plant voltage-gated K+ channels and metazoan Shakers derive from distinct prokaryotic ancestors. The plant channels belong to a lineage that includes cyclic nucleotide-gated channels and metazoan ether-à-go-go and hyperpolarization-activated, cyclic nucleotide-gated channels. We refer to this lineage as the CNBD channel superfamily, because all these channels share a cytoplasmic gating domain homologous to cyclic nucleotide binding domains. The first structures of CNBD superfamily channels reveal marked differences in coupling between the voltage sensor and ion-conducting pore relative to metazoan Shaker channels. Viewing plant voltage-gated K+ channel function through the lens of CNBD superfamily structures should lead to insights into how these channels are regulated.
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Affiliation(s)
- Timothy Jegla
- Department of Biology and Huck Institute for the Life Sciences, Penn State University, 230 Life Sciences Building, University Park, Pennsylvania 16802
| | - Gregory Busey
- Department of Biology, Penn State University, 225 Life Sciences Building, University Park, Pennsylvania 16802
| | - Sarah M Assmann
- Department of Biology, Penn State University, 354 North Frear, University Park, Pennsylvania 16802
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19
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Sklodowski K, Riedelsberger J, Raddatz N, Riadi G, Caballero J, Chérel I, Schulze W, Graf A, Dreyer I. The receptor-like pseudokinase MRH1 interacts with the voltage-gated potassium channel AKT2. Sci Rep 2017; 7:44611. [PMID: 28300158 PMCID: PMC5353636 DOI: 10.1038/srep44611] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 01/25/2017] [Indexed: 12/23/2022] Open
Abstract
The potassium channel AKT2 plays important roles in phloem loading and unloading. It can operate as inward-rectifying channel that allows H+-ATPase-energized K+ uptake. Moreover, through reversible post-translational modifications it can also function as an open, K+-selective channel, which taps a 'potassium battery', providing additional energy for transmembrane transport processes. Knowledge about proteins involved in the regulation of the operational mode of AKT2 is very limited. Here, we employed a large-scale yeast two-hybrid screen in combination with fluorescence tagging and null-allele mutant phenotype analysis and identified the plasma membrane localized receptor-like kinase MRH1/MDIS2 (AT4G18640) as interaction partner of AKT2. The phenotype of the mrh1-1 knockout plant mirrors that of akt2 knockout plants in energy limiting conditions. Electrophysiological analyses showed that MRH1/MDIS2 failed to exert any functional regulation on AKT2. Using structural protein modeling approaches, we instead gathered evidence that the putative kinase domain of MRH1/MDIS2 lacks essential sites that are indispensable for a functional kinase suggesting that MRH1/MDIS2 is a pseudokinase. We propose that MRH1/MDIS2 and AKT2 are likely parts of a bigger protein complex. MRH1 might help to recruit other, so far unknown partners, which post-translationally regulate AKT2. Additionally, MRH1 might be involved in the recognition of chemical signals.
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Affiliation(s)
- Kamil Sklodowski
- Heisenberg Group of Biophysics and Molecular Plant Biology, Institute of Biochemistry and Biology, Molecular Biology, University of Potsdam, D-14476 Potsdam-Golm, Germany
- Max-Planck-Institute of Molecular Plant Physiology, D-14476 Potsdam-Golm, Germany
- ETH Zürich, Department of Biology, CH-8092 Zürich, Switzerland
| | - Janin Riedelsberger
- Centro de Bioinformática y Simulación Molecular, Facultad de Ingeniería, Universidad de Talca, Talca, Chile
| | - Natalia Raddatz
- Plant Biophysics, Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), E-28223 Pozuelo de Alarcón (Madrid), Spain
- Instituto de Biología Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas, E-41092 Sevilla, Spain
| | - Gonzalo Riadi
- Centro de Bioinformática y Simulación Molecular, Facultad de Ingeniería, Universidad de Talca, Talca, Chile
| | - Julio Caballero
- Centro de Bioinformática y Simulación Molecular, Facultad de Ingeniería, Universidad de Talca, Talca, Chile
| | - Isabelle Chérel
- Biochimie et Physiologie Moléculaire des Plantes, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5004, Institut National de la Recherche Agronomique U386, Montpellier SupAgro, Université Montpellier II, F-34060 Montpellier cedex 2, France
| | - Waltraud Schulze
- Max-Planck-Institute of Molecular Plant Physiology, D-14476 Potsdam-Golm, Germany
- Department of Plant Systems Biology, University of Hohenheim, D-70593 Stuttgart, Germany
| | - Alexander Graf
- Max-Planck-Institute of Molecular Plant Physiology, D-14476 Potsdam-Golm, Germany
| | - Ingo Dreyer
- Heisenberg Group of Biophysics and Molecular Plant Biology, Institute of Biochemistry and Biology, Molecular Biology, University of Potsdam, D-14476 Potsdam-Golm, Germany
- Centro de Bioinformática y Simulación Molecular, Facultad de Ingeniería, Universidad de Talca, Talca, Chile
- Plant Biophysics, Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM) - Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), E-28223 Pozuelo de Alarcón (Madrid), Spain
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20
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Pigna G, Dhillon T, Dlugosz EM, Yuan JS, Gorman C, Morandini P, Lenaghan SC, Stewart CN. Methods for suspension culture, protoplast extraction, and transformation of high-biomass yielding perennial grass Arundo donax. Biotechnol J 2016; 11:1657-1666. [PMID: 27762502 DOI: 10.1002/biot.201600486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 10/13/2016] [Accepted: 10/19/2016] [Indexed: 11/11/2022]
Abstract
Arundo donax L. is a promising biofuel feedstock in the Mediterranean region. Despite considerable interest in its genetic improvement, Arundo tissue culture and transformation remains arduous. The authors developed methodologies for cell- and tissue culture and genetic engineering in Arundo. A media screen was conducted, and a suspension culture was established using callus induced from stem axillary bud explants. DBAP medium, containing 9 µM 2,4-D and 4.4 µM BAP, was found to be the most effective medium among those tested for inducing cell suspension cultures, which resulted in a five-fold increase in tissue mass over 14 days. In contrast, CIM medium containing 13 µM 2,4-D, resulted in just a 1.4-fold increase in mass over the same period. Optimized suspension cultures were superior to previously-described solidified medium-based callus culture methods for tissue mass increase. Suspension cultures proved to be very effective for subsequent protoplast isolation. Protoplast electroporation resulted in a 3.3 ± 1.5% transformation efficiency. A dual fluorescent reporter gene vector enabled the direct comparison of the CAMV 35S promoter with the switchgrass ubi2 promoter in single cells of Arundo. The switchgrass ubi2 promoter resulted in noticeably higher reporter gene expression compared with that conferred by the 35S promoter in Arundo.
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Affiliation(s)
- Gaia Pigna
- Department of Plant Sciences, University of Tennessee, Knoxville, Tennessee, USA.,Department of Biosciences, University of Milan, Milano, Italy
| | - Taniya Dhillon
- Department of Plant Sciences, University of Tennessee, Knoxville, Tennessee, USA
| | - Elizabeth M Dlugosz
- Department of Plant Sciences, University of Tennessee, Knoxville, Tennessee, USA
| | - Joshua S Yuan
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, Texas, USA
| | - Connor Gorman
- Department of Plant Pathology and Microbiology, Texas A&M University, College Station, Texas, USA
| | - Piero Morandini
- Department of Biosciences, University of Milan, Milano, Italy.,National Research Council, Institute of Biophysics, Milano, Italy
| | - Scott C Lenaghan
- Department of Food Science, University of Tennessee, Knoxville, Tennessee, USA.,Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee, USA
| | - C Neal Stewart
- Department of Plant Sciences, University of Tennessee, Knoxville, Tennessee, USA
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Nieves-Cordones M, Al Shiblawi FR, Sentenac H. Roles and Transport of Sodium and Potassium in Plants. Met Ions Life Sci 2016; 16:291-324. [PMID: 26860305 DOI: 10.1007/978-3-319-21756-7_9] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The two alkali cations Na(+) and K(+) have similar relative abundances in the earth crust but display very different distributions in the biosphere. In all living organisms, K(+) is the major inorganic cation in the cytoplasm, where its concentration (ca. 0.1 M) is usually several times higher than that of Na(+). Accumulation of Na(+) at high concentrations in the cytoplasm results in deleterious effects on cell metabolism, e.g., on photosynthetic activity in plants. Thus, Na(+) is compartmentalized outside the cytoplasm. In plants, it can be accumulated at high concentrations in vacuoles, where it is used as osmoticum. Na(+) is not an essential element in most plants, except in some halophytes. On the other hand, it can be a beneficial element, by replacing K(+) as vacuolar osmoticum for instance. In contrast, K(+) is an essential element. It is involved in electrical neutralization of inorganic and organic anions and macromolecules, pH homeostasis, control of membrane electrical potential, and the regulation of cell osmotic pressure. Through the latter function in plants, it plays a role in turgor-driven cell and organ movements. It is also involved in the activation of enzymes, protein synthesis, cell metabolism, and photosynthesis. Thus, plant growth requires large quantities of K(+) ions that are taken up by roots from the soil solution, and then distributed throughout the plant. The availability of K(+) ions in the soil solution, slowly released by soil particles and clays, is often limiting for optimal growth in most natural ecosystems. In contrast, due to natural salinity or irrigation with poor quality water, detrimental Na(+) concentrations, toxic for all crop species, are present in many soils, representing 6 % to 10 % of the earth's land area. Three families of ion channels (Shaker, TPK/KCO, and TPC) and 3 families of transporters (HAK, HKT, and CPA) have been identified so far as contributing to K(+) and Na(+) transport across the plasmalemma and internal membranes, with high or low ionic selectivity. In the model plant Arabidopsis thaliana, these families gather at least 70 members. Coordination of the activities of these systems, at the cell and whole plant levels, ensures plant K(+) nutrition, use of Na(+) as a beneficial element, and adaptation to saline conditions.
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Affiliation(s)
- Manuel Nieves-Cordones
- Laboratory of Plant Biochemistry and Molecular Physiology, UMR BPMP CNRS/INRA/MontpellierSupAgro, University of Montpellier, INRA, Place Viala, F-34060, Montpellier cedex 1, France
| | - Fouad Razzaq Al Shiblawi
- Laboratory of Plant Biochemistry and Molecular Physiology, UMR BPMP CNRS/INRA/MontpellierSupAgro, University of Montpellier, INRA, Place Viala, F-34060, Montpellier cedex 1, France
| | - Hervé Sentenac
- Laboratory of Plant Biochemistry and Molecular Physiology, UMR BPMP CNRS/INRA/MontpellierSupAgro, University of Montpellier, INRA, Place Viala, F-34060, Montpellier cedex 1, France.
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22
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Carraretto L, Teardo E, Checchetto V, Finazzi G, Uozumi N, Szabo I. Ion Channels in Plant Bioenergetic Organelles, Chloroplasts and Mitochondria: From Molecular Identification to Function. MOLECULAR PLANT 2016; 9:371-395. [PMID: 26751960 DOI: 10.1016/j.molp.2015.12.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 11/22/2015] [Accepted: 12/01/2015] [Indexed: 06/05/2023]
Abstract
Recent technical advances in electrophysiological measurements, organelle-targeted fluorescence imaging, and organelle proteomics have pushed the research of ion transport a step forward in the case of the plant bioenergetic organelles, chloroplasts and mitochondria, leading to the molecular identification and functional characterization of several ion transport systems in recent years. Here we focus on channels that mediate relatively high-rate ion and water flux and summarize the current knowledge in this field, focusing on targeting mechanisms, proteomics, electrophysiology, and physiological function. In addition, since chloroplasts evolved from a cyanobacterial ancestor, we give an overview of the information available about cyanobacterial ion channels and discuss the evolutionary origin of chloroplast channels. The recent molecular identification of some of these ion channels allowed their physiological functions to be studied using genetically modified Arabidopsis plants and cyanobacteria. The view is emerging that alteration of chloroplast and mitochondrial ion homeostasis leads to organelle dysfunction, which in turn significantly affects the energy metabolism of the whole organism. Clear-cut identification of genes encoding for channels in these organelles, however, remains a major challenge in this rapidly developing field. Multiple strategies including bioinformatics, cell biology, electrophysiology, use of organelle-targeted ion-sensitive probes, genetics, and identification of signals eliciting specific ion fluxes across organelle membranes should provide a better understanding of the physiological role of organellar channels and their contribution to signaling pathways in plants in the future.
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Affiliation(s)
- Luca Carraretto
- Department of Biology, University of Padova, Padova 35121, Italy
| | - Enrico Teardo
- Department of Biology, University of Padova, Padova 35121, Italy; CNR Institute of Neuroscience, University of Padova, Padova 35121, Italy
| | | | - Giovanni Finazzi
- UMR 5168 Laboratoire de Physiologie Cellulaire Végétale (LPCV) CNRS/ UJF / INRA / CEA, Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV), CEA Grenoble, 38054 Grenoble, France.
| | - Nobuyuki Uozumi
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, Aobayama 6-6-07, Sendai 980-8579, Japan.
| | - Ildiko Szabo
- Department of Biology, University of Padova, Padova 35121, Italy; CNR Institute of Neuroscience, University of Padova, Padova 35121, Italy.
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Burris KP, Dlugosz EM, Collins AG, Stewart CN, Lenaghan SC. Development of a rapid, low-cost protoplast transfection system for switchgrass (Panicum virgatum L.). PLANT CELL REPORTS 2016; 35:693-704. [PMID: 26685665 PMCID: PMC4757626 DOI: 10.1007/s00299-015-1913-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 11/19/2015] [Accepted: 11/26/2015] [Indexed: 05/03/2023]
Abstract
A switchgrass protoplast system was developed, achieving a cost reduction of ~1000-fold, a threefold increase in transformation efficiency, and a fourfold reduction in required DNA quantity compared to previous methods. In recent years, there has been a resurgence in the use of protoplast systems for rapid screening of gene silencing and genome-editing targets for siRNA, miRNA, and CRISPR technologies. In the case of switchgrass (Panicum virgatum L.), to achieve economic feasibility for biofuel production, it is necessary to develop plants with decreased cell wall recalcitrance to reduce processing costs. To achieve this goal, transgenic plants have been generated with altered cell wall chemistry; however, with limited success owing to the complexity of cell walls. Because of the considerable cost, time, and effort required to screen transgenic plants, a protoplast system that can provide data at an early stage has potential to eliminate low performing candidate genes/targets prior to the creation of transgenic plants. Despite the advantages of protoplast systems, protoplast isolation in switchgrass has proven costly, requiring expensive lab-grade enzymes and high DNA quantities. In this paper, we describe a low-cost protoplast isolation system using a mesophyll culture approach and a cell suspension culture. Results from this work show a cost reduction of ~1000-fold compared to previous methods of protoplast isolation in switchgrass, with a cost of $0.003 (USD) per reaction for mesophyll protoplasts and $0.018 for axenic cell culture-derived protoplasts. Further, the efficiency of protoplast transformation was optimized threefold over previous methods, despite a fourfold reduction in DNA quantity. The methods developed in this work remove the cost barrier previously limiting high-throughput screening of genome-editing and gene silencing targets in switchgrass, paving the way for more efficient development of transgenic plants.
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Affiliation(s)
- Kellie P Burris
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, 37996, USA
| | - Elizabeth M Dlugosz
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, 37996, USA
| | - A Grace Collins
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, 37996, USA
| | - C Neal Stewart
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, 37996, USA
| | - Scott C Lenaghan
- Center for Renewable Carbon, University of Tennessee, Knoxville, TN, 37996, USA.
- Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, TN, 37996, USA.
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24
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Lefoulon C, Boeglin M, Moreau B, Véry AA, Szponarski W, Dauzat M, Michard E, Gaillard I, Chérel I. The Arabidopsis AtPP2CA Protein Phosphatase Inhibits the GORK K+ Efflux Channel and Exerts a Dominant Suppressive Effect on Phosphomimetic-activating Mutations. J Biol Chem 2016; 291:6521-33. [PMID: 26801610 DOI: 10.1074/jbc.m115.711309] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Indexed: 12/13/2022] Open
Abstract
The regulation of the GORK (Guard Cell Outward Rectifying) Shaker channel mediating a massive K(+) efflux in Arabidopsis guard cells by the phosphatase AtPP2CA was investigated. Unlike the gork mutant, the atpp2ca mutants displayed a phenotype of reduced transpiration. We found that AtPP2CA interacts physically with GORK and inhibits GORK activity in Xenopus oocytes. Several amino acid substitutions in the AtPP2CA active site, including the dominant interfering G145D mutation, disrupted the GORK-AtPP2CA interaction, meaning that the native conformation of the AtPP2CA active site is required for the GORK-AtPP2CA interaction. Furthermore, two serines in the GORK ankyrin domain that mimic phosphorylation (Ser to Glu) or dephosphorylation (Ser to Ala) were mutated. Mutations mimicking phosphorylation led to a significant increase in GORK activity, whereas mutations mimicking dephosphorylation had no effect on GORK. In Xenopus oocytes, the interaction of AtPP2CA with "phosphorylated" or "dephosphorylated" GORK systematically led to inhibition of the channel to the same baseline level. Single-channel recordings indicated that the GORK S722E mutation increases the open probability of the channel in the absence, but not in the presence, of AtPP2CA. The dephosphorylation-independent inactivation mechanism of GORK by AtPP2CA is discussed in relation with well known conformational changes in animal Shaker-like channels that lead to channel opening and closing. In plants, PP2C activity would control the stomatal aperture by regulating both GORK and SLAC1, the two main channels required for stomatal closure.
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Affiliation(s)
- Cécile Lefoulon
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
| | - Martin Boeglin
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
| | - Bertrand Moreau
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
| | - Anne-Aliénor Véry
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
| | - Wojciech Szponarski
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
| | - Myriam Dauzat
- the Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, INRA/SupAgro, UMR 759, 2 Place Viala, 34060 Montpellier Cedex, France
| | - Erwan Michard
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
| | - Isabelle Gaillard
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
| | - Isabelle Chérel
- From the Laboratoire de Biochimie et Physiologie Moléculaire des Plantes, CNRS/INRA/SupAgro/UM2, Unité Mixte de Recherche (UMR) 5004, 2 Place Viala, 34060 Montpellier Cedex, France and
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25
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Safiarian MJ, Pertl-Obermeyer H, Lughofer P, Hude R, Bertl A, Obermeyer G. Lost in traffic? The K(+) channel of lily pollen, LilKT1, is detected at the endomembranes inside yeast cells, tobacco leaves, and lily pollen. FRONTIERS IN PLANT SCIENCE 2015; 6:47. [PMID: 25713578 PMCID: PMC4322604 DOI: 10.3389/fpls.2015.00047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 01/16/2015] [Indexed: 05/26/2023]
Abstract
Fertilization in plants relies on fast growth of pollen tubes through the style tissue toward the ovules. This polarized growth depends on influx of ions and water to increase the tube's volume. K(+) inward rectifying channels were detected in many pollen species, with one identified in Arabidopsis. Here, an Arabidopsis AKT1-like channel (LilKT1) was identified from Lilium longiflorum pollen. Complementation of K(+) uptake deficient yeast mutants was only successful when the entire LilKT1 C-terminus was replaced by the AKT1 C-terminus. No signals were observed in the plasma membrane (PM) of pollen tubes after expression of fluorescence-tagged LilKT1 nor were any LilKT1-derived peptides detectable in the pollen PM by mass spectrometry analysis. In contrast, fluorescent LilKT1 partly co-localized with the lily PM H(+) ATPase LilHA2 in the PM of tobacco leaf cells, but exhibited a punctual fluorescence pattern and also sub-plasma membrane localization. Thus, incorporation of LilKT1 into the pollen PM seems tighter controlled than in other cells with still unknown trafficking signals in LilKT1's C-terminus, resulting in channel densities below detection limits. This highly controlled incorporation might have physiological reasons: an uncontrolled number of K(+) inward channels in the pollen PM will give an increased water influx due to the raising cytosolic K(+) concentration, and finally, causing the tube to burst.
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Affiliation(s)
- Minou J. Safiarian
- Molecular Plant Biophysics and Biochemistry, Department of Molecular Biology, University of SalzburgSalzburg, Austria
| | - Heidi Pertl-Obermeyer
- Molecular Plant Biophysics and Biochemistry, Department of Molecular Biology, University of SalzburgSalzburg, Austria
- Plant Systems Biology, University of HohenheimStuttgart, Germany
| | - Peter Lughofer
- Molecular Plant Biophysics and Biochemistry, Department of Molecular Biology, University of SalzburgSalzburg, Austria
| | - Rene Hude
- Molecular Plant Biophysics and Biochemistry, Department of Molecular Biology, University of SalzburgSalzburg, Austria
| | - Adam Bertl
- Yeast Membrane Biology, Department of Biology, Darmstadt University of TechnologyDarmstadt, Germany
| | - Gerhard Obermeyer
- Molecular Plant Biophysics and Biochemistry, Department of Molecular Biology, University of SalzburgSalzburg, Austria
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26
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Ronzier E, Corratgé-Faillie C, Sanchez F, Prado K, Brière C, Leonhardt N, Thibaud JB, Xiong TC. CPK13, a noncanonical Ca2+-dependent protein kinase, specifically inhibits KAT2 and KAT1 shaker K+ channels and reduces stomatal opening. PLANT PHYSIOLOGY 2014; 166:314-26. [PMID: 25037208 PMCID: PMC4149717 DOI: 10.1104/pp.114.240226] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 07/15/2014] [Indexed: 05/18/2023]
Abstract
Ca(2) (+)-dependent protein kinases (CPKs) form a large family of 34 genes in Arabidopsis (Arabidopsis thaliana). Based on their dependence on Ca(2+), CPKs can be sorted into three types: strictly Ca(2+)-dependent CPKs, Ca(2+)-stimulated CPKs (with a significant basal activity in the absence of Ca(2+)), and essentially calcium-insensitive CPKs. Here, we report on the third type of CPK, CPK13, which is expressed in guard cells but whose role is still unknown. We confirm the expression of CPK13 in Arabidopsis guard cells, and we show that its overexpression inhibits light-induced stomatal opening. We combine several approaches to identify a guard cell-expressed target. We provide evidence that CPK13 (1) specifically phosphorylates peptide arrays featuring Arabidopsis K(+) Channel KAT2 and KAT1 polypeptides, (2) inhibits KAT2 and/or KAT1 when expressed in Xenopus laevis oocytes, and (3) closely interacts in plant cells with KAT2 channels (Förster resonance energy transfer-fluorescence lifetime imaging microscopy). We propose that CPK13 reduces stomatal aperture through its inhibition of the guard cell-expressed KAT2 and KAT1 channels.
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Affiliation(s)
- Elsa Ronzier
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
| | - Claire Corratgé-Faillie
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
| | - Frédéric Sanchez
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
| | - Karine Prado
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
| | - Christian Brière
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
| | - Nathalie Leonhardt
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
| | - Jean-Baptiste Thibaud
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
| | - Tou Cheu Xiong
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 386, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5004, SupAgro, and Université Montpellier 2, Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, F-34060 Montpellier cedex 2, France (E.R., C.C.-F., F.S., K.P., J.-B.T., T.C.X.);Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5546, Laboratoire de Recherche en Sciences Végétales, 31326 Castanet-Tolosan, France (C.B.);Université Paul Sabatier, Pôle de Biotechnologies Végétales 24, Chemin de Borde Rouge, Boite Postale 42617 Auzeville, 31326 Castanet-Tolosan, France (C.B.); andLaboratoire de Biologie du Développement des Plantes, Unité Mixte de Recherche 7265 Centre National de la Recherche Scientifique-Commissariat à l'Energie Atomique-Université Aix-Marseille II, Commissariat à l'Energie Atomique Cadarache Bat 156, 13108 St. Paul Lez Durance, France (N.L.)
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Pan Y, Laird JG, Yamaguchi DM, Baker SA. A di-arginine ER retention signal regulates trafficking of HCN1 channels from the early secretory pathway to the plasma membrane. Cell Mol Life Sci 2014; 72:833-43. [PMID: 25142030 PMCID: PMC4309907 DOI: 10.1007/s00018-014-1705-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 07/14/2014] [Accepted: 08/12/2014] [Indexed: 12/25/2022]
Abstract
Hyperpolarization-activated cyclic nucleotide-gated 1 (HCN1) channels carry Ih, which contributes to neuronal excitability and signal transmission in the nervous system. Controlling the trafficking of HCN1 is an important aspect of its regulation, yet the details of this process are poorly understood. Here, we investigated how the C-terminus of HCN1 regulates trafficking by testing for its ability to redirect the localization of a non-targeted reporter in transgenic Xenopus laevis photoreceptors. We found that HCN1 contains an ER localization signal and through a series of deletion constructs, identified the responsible di-arginine ER retention signal. This signal is located in the intrinsically disordered region of the C-terminus of HCN1. To test the function of the ER retention signal in intact channels, we expressed wild type and mutant HCN1 in HEK293 cells and found this signal negatively regulates surface expression of HCN1. In summary, we report a new mode of regulating HCN1 trafficking: through the use of a di-arginine ER retention signal that monitors processing of the channel in the early secretory pathway.
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Affiliation(s)
- Yuan Pan
- Department of Biochemistry, Carver College of Medicine, University of Iowa, 51 Newton Road, Biochemistry, 4-712 BSB, Iowa City, IA, 52242, USA
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Nieves-Cordones M, Gaillard I. Involvement of the S4-S5 linker and the C-linker domain regions to voltage-gating in plant Shaker channels: comparison with animal HCN and Kv channels. PLANT SIGNALING & BEHAVIOR 2014; 9:e972892. [PMID: 25482770 PMCID: PMC4622754 DOI: 10.4161/15592316.2014.972892] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Among the different transport systems present in plant cells, Shaker channels constitute the major pathway for K(+) in the plasma membrane. Plant Shaker channels are members of the 6 transmembrane-1 pore (6TM-1P) cation channel superfamily as the animal Shaker (Kv) and HCN channels. All these channels are voltage-gated K(+) channels: Kv channels are outward-rectifiers, opened at depolarized voltages and HCN channels are inward-rectifiers, opened by membrane hyperpolarization. Among plant Shaker channels, we can find outward-rectifiers, inward-rectifiers and also weak-rectifiers, with weak voltage dependence. Despite the absence of crystal structures of plant Shaker channels, functional analyses coupled to homology modeling, mostly based on Kv and HCN crystals, have permitted the identification of several regions contributing to plant Shaker channel gating. In the present mini-review, we make an update on the voltage-gating mechanism of plant Shaker channels which seem to be comparable to that proposed for HCN channels.
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Affiliation(s)
- Manuel Nieves-Cordones
- Biochimie et Physiologie Moléculaire des Plantes; Institut de Biologie Intégrative des Plantes; Unité Mixte de Recherche 5004 Centre National de la Recherche Scientifique/Unité Mixte de Recherche 0386 Institut National de la Recherche Agronomique/Montpellier SupAgro/Université Montpellier 2; Montpellier, France
- Correspondence to: Manuel Nieves-Cordones; , Isabelle Gaillard;
| | - Isabelle Gaillard
- Biochimie et Physiologie Moléculaire des Plantes; Institut de Biologie Intégrative des Plantes; Unité Mixte de Recherche 5004 Centre National de la Recherche Scientifique/Unité Mixte de Recherche 0386 Institut National de la Recherche Agronomique/Montpellier SupAgro/Université Montpellier 2; Montpellier, France
- Correspondence to: Manuel Nieves-Cordones; , Isabelle Gaillard;
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