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Somagattu P, Chinnannan K, Yammanuru H, Reddy UK, Nimmakayala P. Selenium dynamics in plants: Uptake, transport, toxicity, and sustainable management strategies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 949:175033. [PMID: 39059668 DOI: 10.1016/j.scitotenv.2024.175033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 07/22/2024] [Accepted: 07/23/2024] [Indexed: 07/28/2024]
Abstract
Selenium (Se) plays crucial roles in human, animal, and plant physiology, but its varied plant functions remain complex and not fully understood. While Se deficiency affects over a billion people worldwide, excessive Se levels can be toxic, presenting substantial risks to ecosystem health and public safety. The delicate balance between Se's beneficial and harmful effects necessitates a deeper understanding of its speciation dynamics and how different organisms within ecosystems respond to Se. Since humans primarily consume Se through Se-rich foods, exploring Se's behavior, uptake, and transport within agroecosystems is critical to creating effective management strategies. Traditional physicochemical methods for Se remediation are often expensive and potentially harmful to the environment, pushing the need for more sustainable solutions. In recent years, phytotechnologies have gained traction as a promising approach to Se management by harnessing plants' natural abilities to absorb, accumulate, metabolize, and volatilize Se. These strategies range from boosting Se uptake and tolerance in plants to releasing Se as less toxic volatile compounds or utilizing it as a biofortified supplement, opening up diverse possibilities for managing Se, offering sustainable pathways to improve crop nutritional quality, and protecting human health in different environmental contexts. However, closing the gaps in our understanding of Se dynamics within agricultural systems calls for a united front of interdisciplinary collaboration from biology to environmental science, agriculture, and public health, which has a crucial role to play. Phytotechnologies offer a sustainable bridge between Se deficiency and toxicity, but further research is needed to optimize these methods and explore their potential in various agricultural and environmental settings. By shedding light on Se's multifaceted roles and refining management strategies, this review contributes to developing cost-effective and eco-friendly approaches for Se management in agroecosystems. It aims to lead the way toward a healthier and more sustainable future by balancing the need to address Se deficiency and mitigate the risks of Se toxicity.
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Affiliation(s)
- Prapooja Somagattu
- Department of Biology, Gus R. Douglass Institute, West Virginia State University, Institute, WV 25112, USA
| | - Karthik Chinnannan
- Department of Biology, Gus R. Douglass Institute, West Virginia State University, Institute, WV 25112, USA
| | - Hyndavi Yammanuru
- Department of Biology, Gus R. Douglass Institute, West Virginia State University, Institute, WV 25112, USA
| | - Umesh K Reddy
- Department of Biology, Gus R. Douglass Institute, West Virginia State University, Institute, WV 25112, USA
| | - Padma Nimmakayala
- Department of Biology, Gus R. Douglass Institute, West Virginia State University, Institute, WV 25112, USA.
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Lindberg S, Premkumar A. Ion Changes and Signaling under Salt Stress in Wheat and Other Important Crops. PLANTS (BASEL, SWITZERLAND) 2023; 13:46. [PMID: 38202354 PMCID: PMC10780558 DOI: 10.3390/plants13010046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 12/14/2023] [Accepted: 12/16/2023] [Indexed: 01/12/2024]
Abstract
High concentrations of sodium (Na+), chloride (Cl-), calcium (Ca2+), and sulphate (SO42-) are frequently found in saline soils. Crop plants cannot successfully develop and produce because salt stress impairs the uptake of Ca2+, potassium (K+), and water into plant cells. Different intracellular and extracellular ionic concentrations change with salinity, including those of Ca2+, K+, and protons. These cations serve as stress signaling molecules in addition to being essential for ionic homeostasis and nutrition. Maintaining an appropriate K+:Na+ ratio is one crucial plant mechanism for salt tolerance, which is a complicated trait. Another important mechanism is the ability for fast extrusion of Na+ from the cytosol. Ca2+ is established as a ubiquitous secondary messenger, which transmits various stress signals into metabolic alterations that cause adaptive responses. When plants are under stress, the cytosolic-free Ca2+ concentration can rise to 10 times or more from its resting level of 50-100 nanomolar. Reactive oxygen species (ROS) are linked to the Ca2+ alterations and are produced by stress. Depending on the type, frequency, and intensity of the stress, the cytosolic Ca2+ signals oscillate, are transient, or persist for a longer period and exhibit specific "signatures". Both the influx and efflux of Ca2+ affect the length and amplitude of the signal. According to several reports, under stress Ca2+ alterations can occur not only in the cytoplasm of the cell but also in the cell walls, nucleus, and other cell organelles and the Ca2+ waves propagate through the whole plant. Here, we will focus on how wheat and other important crops absorb Na+, K+, and Cl- when plants are under salt stress, as well as how Ca2+, K+, and pH cause intracellular signaling and homeostasis. Similar mechanisms in the model plant Arabidopsis will also be considered. Knowledge of these processes is important for understanding how plants react to salinity stress and for the development of tolerant crops.
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Affiliation(s)
- Sylvia Lindberg
- Department of Ecology, Environment and Plant Sciences, Stockholm University, SE-114 18 Stockholm, Sweden
| | - Albert Premkumar
- Bharathiyar Group of Institutes, Guduvanchery 603202, Tamilnadu, India;
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3
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Yu X, Yang L, Fan C, Hu J, Zheng Y, Wang Z, Liu Y, Xiao X, Yang L, Lei T, Jiang M, Jiang B, Pan Y, Li X, Gao S, Zhou Y. Abscisic acid (ABA) alleviates cadmium toxicity by enhancing the adsorption of cadmium to root cell walls and inducing antioxidant defense system of Cosmos bipinnatus. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 261:115101. [PMID: 37290296 DOI: 10.1016/j.ecoenv.2023.115101] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 04/08/2023] [Accepted: 06/01/2023] [Indexed: 06/10/2023]
Abstract
Cadmium (Cd) pollution is a global problem affecting soil ecology and plant growth. Abscisic acid (ABA) acts as a growth and stress hormone, regulates cell wall synthesis, and plays an important role in plant responses to stress. There are few studies on the mechanisms behind abscisic acid alleviation of cadmium stress in Cosmos bipinnatus, especially in regards to regulation of the root cell wall. This study examined the effects of different concentrations of abscisic acid at different concentrations of cadmium stress. Through adding 5 μmol/L and 30 μmol/L cadmium, followed by spraying 10 μmol/L and 40 μmol/L ABA in a hydroponic experiment, it was found that under two concentrations of cadmium stress, low concentration of ABA improved root cell wall polysaccharide, Cd, and uronic acid content. Especially in pectin, after the application of low concentration ABA, the cadmium concentration was significantly increased by 1.5 times and 1.2 times compared with the Cd concentration under Cd5 and Cd30 treatment alone, respectively. Fourier-Transform Infrared spectroscopy (FTIR) demonstrated that cell wall functional groups such as -OH and -COOH were increased with exposure to ABA. Additionally, the exogenous ABA also increased expression of three kinds of antioxidant enzymes and plant antioxidants. The results of this study suggest that ABA could reduce Cd stress by increasing Cd accumulation, promoting Cd adsorption on the root cell wall, and activating protective mechanisms. This result could help promote application of C. bipinnatus for phytostabilization of cadmium-contaminated soil.
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Affiliation(s)
- Xiaofang Yu
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China.
| | - Liu Yang
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Chunyu Fan
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Jiani Hu
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Yunhao Zheng
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Zhiwen Wang
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Yujia Liu
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Xue Xiao
- Triticeae research Institute, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Lijuan Yang
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Ting Lei
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Mingyan Jiang
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Beibei Jiang
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Yuanzhi Pan
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Xi Li
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Suping Gao
- College of landscape architecture, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
| | - Yonghong Zhou
- Triticeae research Institute, Sichuan Agricultural University, Chengdu, Sichuan 611130, China
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Zhang L, Chu C. Selenium Uptake, Transport, Metabolism, Reutilization, and Biofortification in Rice. RICE (NEW YORK, N.Y.) 2022; 15:30. [PMID: 35701545 PMCID: PMC9198118 DOI: 10.1186/s12284-022-00572-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 04/29/2022] [Indexed: 05/13/2023]
Abstract
Selenium (Se) is an essential trace element for humans and other animals. The human body mainly acquires Se from plant foods, especially cereal grains. Rice is the staple food for more than half of the world's population. Increasing the Se concentration of rice grains can increase the average human dietary Se intake. This review summarizes recent advances in the molecular mechanisms of Se uptake, transport, subcellular distribution, retranslocation, volatilization, and Se-containing protein degradation in plants, especially rice. The strategies for improving Se concentration in rice grains by increasing Se accumulation, reducing Se volatilization, and optimizing Se form were proposed, which provide new insight into Se biofortification in rice by improving the utilization efficiency of Se.
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Affiliation(s)
- Lianhe Zhang
- Luoyang Key Laboratory of Plant Nutrition and Environmental Ecology, Agricultural College, Henan University of Science and Technology, Luoyang, 471003, China.
| | - Chengcai Chu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.
- Guangdong Laboratory for Lingnan Modern Agriculture and Technology, Guangzhou, 510642, China.
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Shen Y, He F, Zhu J, Zhang H, Wang J, Wang H, Zhan X. Proton-coupled cotransporter involves phenanthrene xylem loading in roots. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 773:145637. [PMID: 33582351 DOI: 10.1016/j.scitotenv.2021.145637] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/31/2021] [Accepted: 01/31/2021] [Indexed: 06/12/2023]
Abstract
The uptake and translocation of polycyclic aromatic hydrocarbons (PAHs) by staple crops have gained much attention. However, the mechanism on phenanthrene xylem loading across plasma membrane is still unclear. In this study, we investigated the concentration dependence of phenanthrene xylem loading and the relationship between phenanthrene concentration and xylem sap pH. The impacts of metabolic inhibitor, temperature, and dissolved oxygen on phenanthrene concentration in xylem sap were observed as well. The Michaelis-Menten equation fits phenanthrene xylem loading across parenchyma cell membrane well and xylem sap pH decreases with the increase in treated phenanthrene concentration. Metabolic inhibitor, low temperature and low dissolved oxygen can suppress phenanthrene loading into xylem sap. The inhibitory rate of sodium vanadate on xylem sap phenanthrene is between 19.76% and 25.82%. Low temperature reduces phenanthrene concentration in xylem sap by 86.68%. Hypoxia (2 mg L-1) inhibits phenanthrene loading into xylem by 78.67%. Therefore, it is indicated that H+/phenanthrene cotransporter is implicated in phenanthrene loading into xylem. Our work offers a valuable model to understand the mechanism of PAH loading into xylem.
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Affiliation(s)
- Yu Shen
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, PR China
| | - Fang He
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, PR China
| | - Jiahui Zhu
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, PR China
| | - Huihui Zhang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, PR China
| | - Jia Wang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, PR China
| | - Huiqian Wang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, PR China
| | - Xinhua Zhan
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, PR China.
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Le Deunff E, Beauclair P, Lecourt J, Deleu C, Malagoli P. Combined Allosteric Responses Explain the Bifurcation in Non-Linear Dynamics of 15N Root Fluxes Under Nutritional Steady-State Conditions for Nitrate. FRONTIERS IN PLANT SCIENCE 2020; 11:1253. [PMID: 33384698 PMCID: PMC7770280 DOI: 10.3389/fpls.2020.01253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 07/29/2020] [Indexed: 06/02/2023]
Abstract
With regard to thermodynamics out of equilibrium, seedlings are open systems that dissipate energy towards their environment. Accordingly, under nutritional steady-state conditions, changes in external concentrations of one single ion provokes instability and reorganization in the metabolic and structure/architecture of the seedling that is more favorable to the fluxes of energy and matter. This reorganization is called a bifurcation and is described in mathematics as a non-linear dynamic system. In this study, we investigate the non-linear dynamics of 15N fluxes among cellular compartments of B. napus seedlings in response to a wide range of external NO 3 - 15 concentrations (from 0.05 to 20 mM): this allows to determine whether any stationary states and bifurcations could be found. The biphasic behavior of the root NO 3 - 15 uptake rate (vin ) was explained by the combined cooperative properties between the vapp (N uptake, storage and assimilation rate) and vout (N translocation rate) 15N fluxes that revealed a unique and stable stationary state around 0.28 mM nitrate. The disappearance of this stationary state around 0.5 mM external nitrate concentrations provokes a dramatic bifurcation in 15N flux pattern. This bifurcation in the vin and vout 15N fluxes fits better with the increase of BnNPF6.3/NRT1.1 expression than BnNRT2.1 nitrate transporter genes, confirming the allosteric property of the BnNPF6/NRT1.1 transporter, as reported in the literature between low and high nitrate concentrations. Moreover, several statistically significant power-law equations were found between variations in the shoots tryptophan concentrations (i.e., IAA precursor) with changes in the vapp and vout 15N fluxes as well as a synthetic parameter of plant N status estimated from the root/shoot ratio of total free amino acids concentrations. These relationships designate IAA as one of the major biological parameters related to metabolic and structural-morphological reorganization coupled with the N and water fluxes induced by nitrate. The results seriously challenge the scientific grounds of the concept of high- and low-affinity of nitrate transporters and are therefore discussed in terms of the ecological significance and physiological implications on the basis of recent agronomic, physiological and molecular data of the literature.
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Affiliation(s)
- Erwan Le Deunff
- Normandie Université, UNICAEN, Caen, France
- Institute of Plant Sciences Paris Saclay (IPS2), CNRS, INRA, Université Paris-Sud, Université d’Evry, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Patrick Beauclair
- INRA Unité Expérimentale Fourrages Environnement Ruminants (FERLUS) et Système d’Observation et d’Expérimentation pour la Recherche en Environnement (SOERE) Les Verrines CS 80006, Lusignan, France
| | - Julien Lecourt
- NIAB EMR, Crop Science and Production Systems, East Malling, United Kingdom
| | - Carole Deleu
- INRA—Agrocampus Ouest—Université de Rennes 1, UMR 1349 Institut de Génétique, Environnement et Protection des Plantes (IGEPP) Université de Rennes 1, Rennes, France
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7
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Lu Q, Chen S, Li Y, Zheng F, He B, Gu M. Exogenous abscisic acid (ABA) promotes cadmium (Cd) accumulation in Sedum alfredii Hance by regulating the expression of Cd stress response genes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:8719-8731. [PMID: 31912395 DOI: 10.1007/s11356-019-07512-w] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Accepted: 12/23/2019] [Indexed: 05/18/2023]
Abstract
Sedum alfredii Hance is a zinc (Zn) and cadmium (Cd) hyperaccumulator plant. However, the regulatory role of plant hormones in the Zn or Cd uptake and accumulation of S. alfredii remains unclear. In this work, the growth, Cd accumulation, abscisic acid (ABA) synthesis and catabolism, malonaldehyde (MDA) content, and transcriptional level of some Cd stress response genes under ABA and Cd co-treatment were investigated to reveal the impact of ABA on Cd resistance and Cd accumulation of S. alfredii. The results show that 0.2 mg/L ABA and 100 μmol/L Cd co-treatment enhanced Cd accumulation and growth in S. alfredii, whereas lower or higher ABA concentrations weaken or even reverse this effect, which was positively correlated with endogenous ABA content. The increase in endogenous ABA content might be the results of the increasing ABA synthetase activities and decreasing ABA lytic enzyme, which was induced by the application of 0.2 mg/L ABA under 100 μmol/L Cd treatment. Principal component analysis (PCA) indicated that ABA impacted the expression pattern of Cd stress response genes, which coincided with the Cd accumulation pattern in the shoots of S. alfredii. Cross-over analysis of partial least squares-discriminant analysis (PLS-DA) and correlation analysis indicated that HsfA4c, HMA4 expression in roots, and HMA2, HMA3, CAD, NAS expression in shoots were correlated with endogenous ABA, which suggests that endogenous ABA improves Cd resistance of seedlings, switches the root-to-shoot transporter from HMA2 to HMA4, and transports more Cd into apoplasts to promote Cd accumulation in the shoots of S. alfredii. Taken together, ABA plays an essential role not only in Cd resistance but also in Cd transport from root to shoot in S. alfredii under Cd stress.
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Affiliation(s)
- Qinyu Lu
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China
- Agricultural College, Guangxi University, Nanning, 530004, China
| | - Shimiao Chen
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China
- Agricultural College, Guangxi University, Nanning, 530004, China
| | - Yanyan Li
- Qinzhou Institute of Agricultural Sciences, Qinzhou, 535000, China
| | - Fuhai Zheng
- Guangzhou Institute of Forestry and Landscape Architecture, Guangzhou, 510405, China
| | - Bing He
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China.
- Agricultural College, Guangxi University, Nanning, 530004, China.
| | - Minghua Gu
- Guangxi Key Laboratory of Agri-environment and Agri-products Safety, Guangxi University, Nanning, 530004, China.
- Agricultural College, Guangxi University, Nanning, 530004, China.
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8
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Colmenero-Flores JM, Franco-Navarro JD, Cubero-Font P, Peinado-Torrubia P, Rosales MA. Chloride as a Beneficial Macronutrient in Higher Plants: New Roles and Regulation. Int J Mol Sci 2019; 20:E4686. [PMID: 31546641 PMCID: PMC6801462 DOI: 10.3390/ijms20194686] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 09/02/2019] [Indexed: 12/24/2022] Open
Abstract
Chloride (Cl-) has traditionally been considered a micronutrient largely excluded by plants due to its ubiquity and abundance in nature, its antagonism with nitrate (NO3-), and its toxicity when accumulated at high concentrations. In recent years, there has been a paradigm shift in this regard since Cl- has gone from being considered a harmful ion, accidentally absorbed through NO3- transporters, to being considered a beneficial macronutrient whose transport is finely regulated by plants. As a beneficial macronutrient, Cl- determines increased fresh and dry biomass, greater leaf expansion, increased elongation of leaf and root cells, improved water relations, higher mesophyll diffusion to CO2, and better water- and nitrogen-use efficiency. While optimal growth of plants requires the synchronic supply of both Cl- and NO3- molecules, the NO3-/Cl- plant selectivity varies between species and varieties, and in the same plant it can be modified by environmental cues such as water deficit or salinity. Recently, new genes encoding transporters mediating Cl- influx (ZmNPF6.4 and ZmNPF6.6), Cl- efflux (AtSLAH3 and AtSLAH1), and Cl- compartmentalization (AtDTX33, AtDTX35, AtALMT4, and GsCLC2) have been identified and characterized. These transporters have proven to be highly relevant for nutrition, long-distance transport and compartmentalization of Cl-, as well as for cell turgor regulation and stress tolerance in plants.
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Affiliation(s)
- José M Colmenero-Flores
- Instituto de Recursos Naturales y Agrobiología, Spanish National Research Council (CSIC), Avda Reina Mercedes 10, 41012 Sevilla, Spain.
| | - Juan D Franco-Navarro
- Instituto de Recursos Naturales y Agrobiología, Spanish National Research Council (CSIC), Avda Reina Mercedes 10, 41012 Sevilla, Spain.
| | - Paloma Cubero-Font
- Instituto de Recursos Naturales y Agrobiología, Spanish National Research Council (CSIC), Avda Reina Mercedes 10, 41012 Sevilla, Spain.
- Biochimie et physiologie Moléculaire des Plantes (BPMP), Univ Montpellier, CNRS, INRA, SupAgro, 2 place P. Viala, 34060 Montpellier, France.
| | - Procopio Peinado-Torrubia
- Instituto de Recursos Naturales y Agrobiología, Spanish National Research Council (CSIC), Avda Reina Mercedes 10, 41012 Sevilla, Spain.
| | - Miguel A Rosales
- Instituto de Recursos Naturales y Agrobiología, Spanish National Research Council (CSIC), Avda Reina Mercedes 10, 41012 Sevilla, Spain.
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De Vriese K, Himschoot E, Dünser K, Nguyen L, Drozdzecki A, Costa A, Nowack MK, Kleine-Vehn J, Audenaert D, Beeckman T, Vanneste S. Identification of Novel Inhibitors of Auxin-Induced Ca 2+ Signaling via a Plant-Based Chemical Screen. PLANT PHYSIOLOGY 2019; 180:480-496. [PMID: 30737267 PMCID: PMC6501068 DOI: 10.1104/pp.18.01393] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 01/29/2019] [Indexed: 05/06/2023]
Abstract
Many signal perception mechanisms are connected to Ca2+-based second messenger signaling to modulate specific cellular responses. The well-characterized plant hormone auxin elicits a very rapid Ca2+ signal. However, the cellular targets of auxin-induced Ca2+ are largely unknown. Here, we screened a biologically annotated chemical library for inhibitors of auxin-induced Ca2+ entry in plant cell suspensions to better understand the molecular mechanism of auxin-induced Ca2+ and to explore the physiological relevance of Ca2+ in auxin signal transduction. Using this approach, we defined a set of diverse, small molecules that interfere with auxin-induced Ca2+ entry. Based on annotated biological activities of the hit molecules, we found that auxin-induced Ca2+ signaling is, among others, highly sensitive to disruption of membrane proton gradients and the mammalian Ca2+ channel inhibitor bepridil. Whereas protonophores nonselectively inhibited auxin-induced and osmotic stress-induced Ca2+ signals, bepridil specifically inhibited auxin-induced Ca2+ We found evidence that bepridil severely alters vacuolar morphology and antagonized auxin-induced vacuolar remodeling. Further exploration of this plant-tailored collection of inhibitors will lead to a better understanding of auxin-induced Ca2+ entry and its relevance for auxin responses.
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Affiliation(s)
- Kjell De Vriese
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Gent, Belgium
| | - Ellie Himschoot
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Gent, Belgium
| | - Kai Dünser
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria
| | - Long Nguyen
- Screening Core, VIB, 9052 Gent, Belgium
- Centre for Bioassay Development and Screening (C-BIOS), Ghent University, 9052 Ghent, Belgium
| | - Andrzej Drozdzecki
- Screening Core, VIB, 9052 Gent, Belgium
- Centre for Bioassay Development and Screening (C-BIOS), Ghent University, 9052 Ghent, Belgium
| | - Alex Costa
- Department of Biosciences, University of Milan, 20133 Milan, Italy
| | - Moritz K Nowack
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Gent, Belgium
| | - Jürgen Kleine-Vehn
- Department of Applied Genetics and Cell Biology, University of Natural Resources and Life Sciences Vienna (BOKU), 1190 Vienna, Austria
| | - Dominique Audenaert
- Screening Core, VIB, 9052 Gent, Belgium
- Centre for Bioassay Development and Screening (C-BIOS), Ghent University, 9052 Ghent, Belgium
| | - Tom Beeckman
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Gent, Belgium
| | - Steffen Vanneste
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- VIB Center for Plant Systems Biology, 9052 Gent, Belgium
- Lab of Plant Growth Analysis, Ghent University Global Campus, 21985 Incheon, Republic of Korea
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Nieves-Cordones M, García-Sánchez F, Pérez-Pérez JG, Colmenero-Flores JM, Rubio F, Rosales MA. Coping With Water Shortage: An Update on the Role of K +, Cl -, and Water Membrane Transport Mechanisms on Drought Resistance. FRONTIERS IN PLANT SCIENCE 2019; 10:1619. [PMID: 31921262 PMCID: PMC6934057 DOI: 10.3389/fpls.2019.01619] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 11/18/2019] [Indexed: 05/21/2023]
Abstract
Drought is now recognized as the abiotic stress that causes most problems in agriculture, mainly due to the strong water demand from intensive culture and the effects of climate change, especially in arid/semi-arid areas. When plants suffer from water deficit (WD), a plethora of negative physiological alterations such as cell turgor loss, reduction of CO2 net assimilation rate, oxidative stress damage, and nutritional imbalances, among others, can lead to a decrease in the yield production and loss of commercial quality. Nutritional imbalances in plants grown under drought stress occur by decreasing water uptake and leaf transpiration, combined by alteration of nutrient uptake and long-distance transport processes. Plants try to counteract these effects by activating drought resistance mechanisms. Correct accumulation of salts and water constitutes an important portion of these mechanisms, in particular of those related to the cell osmotic adjustment and function of stomata. In recent years, molecular insights into the regulation of K+, Cl-, and water transport under drought have been gained. Therefore, this article brings an update on this topic. Moreover, agronomical practices that ameliorate drought symptoms of crops by improving nutrient homeostasis will also be presented.
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Affiliation(s)
- Manuel Nieves-Cordones
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura–CSIC, Murcia, Spain
- *Correspondence: Manuel Nieves-Cordones,
| | - Francisco García-Sánchez
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura–CSIC, Murcia, Spain
| | - Juan G. Pérez-Pérez
- Centro para el Desarrollo de la Agricultura Sostenible (CDAS), Instituto Valenciano de Investigaciones Agrarias (IVIA), Valencia, Spain
| | - Jose M. Colmenero-Flores
- Instituto de Recursos Naturales y Agrobiología, Spanish National Research Council (CSIC), Sevilla, Spain
| | - Francisco Rubio
- Departamento de Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura–CSIC, Murcia, Spain
| | - Miguel A. Rosales
- Instituto de Recursos Naturales y Agrobiología, Spanish National Research Council (CSIC), Sevilla, Spain
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11
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Geilfus CM. Chloride: from Nutrient to Toxicant. PLANT & CELL PHYSIOLOGY 2018; 59:877-886. [PMID: 29660029 DOI: 10.1093/pcp/pcy071] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 03/05/2018] [Indexed: 05/25/2023]
Abstract
In salinized soils in which chloride (Cl-) is the dominant salt anion, growth of plants that tolerate only low concentrations of salt (glycophytes) is disturbed by Cl- toxicity. Chlorotic discolorations precede necrotic lesions, causing yield reductions. Little is known about the effects of Cl- toxicity on these dysfunctions. A lack of understanding exists regarding (i) the molecular and physiological mechanisms that lead to Cl--induced damage and (ii) the adaptive aspects of induced tolerance to Cl- salinity. Here, mechanistic explanations for the Cl--induced stress responses are proposed and novel ideas and strategies by which glycophytic plants avoid the excessive accumulation of Cl- are reviewed. New experiments are suggested to test the proposed hypotheses. Cl- salinity constrains global food security and thus we urgently need more research into the causes and consequences of Cl- salinity.
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Affiliation(s)
- Christoph-Martin Geilfus
- Controlled Environment Horticulture, Faculty of Life Sciences, Albrecht Daniel Thaer-Institute of Agricultural and Horticultural Sciences, Humboldt-University of Berlin, Albrecht-Thaer-Weg 1, D-14195 Berlin, Germany
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12
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Ilangumaran G, Smith DL. Plant Growth Promoting Rhizobacteria in Amelioration of Salinity Stress: A Systems Biology Perspective. FRONTIERS IN PLANT SCIENCE 2017; 8:1768. [PMID: 29109733 PMCID: PMC5660262 DOI: 10.3389/fpls.2017.01768] [Citation(s) in RCA: 182] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 09/27/2017] [Indexed: 05/18/2023]
Abstract
Salinity affects plant growth and is a major abiotic stress that limits crop productivity. It is well-understood that environmental adaptations and genetic traits regulate salinity tolerance in plants, but imparting the knowledge gained towards crop improvement remain arduous. Harnessing the potential of beneficial microorganisms present in the rhizosphere is an alternative strategy for improving plant stress tolerance. This review intends to elucidate the understanding of salinity tolerance mechanisms attributed by plant growth promoting rhizobacteria (PGPR). Recent advances in molecular studies have yielded insights into the signaling networks of plant-microbe interactions that contribute to salt tolerance. The beneficial effects of PGPR involve boosting key physiological processes, including water and nutrient uptake, photosynthesis, and source-sink relationships that promote growth and development. The regulation of osmotic balance and ion homeostasis by PGPR are conducted through modulation of phytohormone status, gene expression, protein function, and metabolite synthesis in plants. As a result, improved antioxidant activity, osmolyte accumulation, proton transport machinery, salt compartmentalization, and nutrient status reduce osmotic stress and ion toxicity. Furthermore, in addition to indole-3-acetic acid and 1-aminocyclopropane-1-carboxylic acid deaminase biosynthesis, other extracellular secretions of the rhizobacteria function as signaling molecules and elicit stress responsive pathways. Application of PGPR inoculants is a promising measure to combat salinity in agricultural fields, thereby increasing global food production.
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Affiliation(s)
| | - Donald L. Smith
- Department of Plant Science, Faculty of Agricultural and Environmental Sciences, McGill University, Sainte-Anne-de-Bellevue, QC, Canada
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13
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Hedrich R, Geiger D. Biology of SLAC1-type anion channels - from nutrient uptake to stomatal closure. THE NEW PHYTOLOGIST 2017; 216:46-61. [PMID: 28722226 DOI: 10.1111/nph.14685] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 04/25/2017] [Indexed: 05/22/2023]
Abstract
Contents 46 I. 46 II. 47 III. 50 IV. 53 V. 56 VI. 57 58 58 References 58 SUMMARY: Stomatal guard cells control leaf CO2 intake and concomitant water loss to the atmosphere. When photosynthetic CO2 assimilation is limited and the ratio of CO2 intake to transpiration becomes suboptimal, guard cells, sensing the rise in CO2 concentration in the substomatal cavity, deflate and the stomata close. Screens for mutants that do not close in response to experimentally imposed high CO2 atmospheres identified the guard cell-expressed Slowly activating anion channel, SLAC1, as the key player in the regulation of stomatal closure. SLAC1 evolved, though, before the emergence of guard cells. In Arabidopsis, SLAC1 is the founder member of a family of anion channels, which comprises four homologues. SLAC1 and SLAH3 mediate chloride and nitrate transport in guard cells, while SLAH1, SLAH2 and SLAH3 are engaged in root nitrate and chloride acquisition, and anion translocation to the shoot. The signal transduction pathways involved in CO2 , water stress and nutrient-sensing activate SLAC/SLAH via distinct protein kinase/phosphatase pairs. In this review, we discuss the role that SLAC/SLAH channels play in guard cell closure, on the one hand, and in the root-shoot continuum on the other, along with the molecular basis of the channels' anion selectivity and gating.
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Affiliation(s)
- Rainer Hedrich
- Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Biocenter, University of Wuerzburg, Wuerzburg, 97082, Germany
| | - Dietmar Geiger
- Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Biocenter, University of Wuerzburg, Wuerzburg, 97082, Germany
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14
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Wege S, Gilliham M, Henderson SW. Chloride: not simply a 'cheap osmoticum', but a beneficial plant macronutrient. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:3057-3069. [PMID: 28379459 DOI: 10.1093/jxb/erx050] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
At macronutrient levels, chloride has positive effects on plant growth, which are distinct from its function in photosynthesis..
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Affiliation(s)
- Stefanie Wege
- Australian Research Council Centre of Excellence in Plant Energy Biology & The University of Adelaide, School of Agriculture, Food and Wine, Waite Research Precinct, PMB1, Glen Osmond, South Australia 5064, Australia
| | - Matthew Gilliham
- Australian Research Council Centre of Excellence in Plant Energy Biology & The University of Adelaide, School of Agriculture, Food and Wine, Waite Research Precinct, PMB1, Glen Osmond, South Australia 5064, Australia
| | - Sam W Henderson
- Australian Research Council Centre of Excellence in Plant Energy Biology & The University of Adelaide, School of Agriculture, Food and Wine, Waite Research Precinct, PMB1, Glen Osmond, South Australia 5064, Australia
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15
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Li B, Tester M, Gilliham M. Chloride on the Move. TRENDS IN PLANT SCIENCE 2017; 22:236-248. [PMID: 28081935 DOI: 10.1016/j.tplants.2016.12.004] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 11/21/2016] [Accepted: 12/11/2016] [Indexed: 05/20/2023]
Abstract
Chloride (Cl-) is an essential plant nutrient but under saline conditions it can accumulate to toxic levels in leaves; limiting this accumulation improves the salt tolerance of some crops. The rate-limiting step for this process - the transfer of Cl- from root symplast to xylem apoplast, which can antagonize delivery of the macronutrient nitrate (NO3-) to shoots - is regulated by abscisic acid (ABA) and is multigenic. Until recently the molecular mechanisms underpinning this salt-tolerance trait were poorly defined. We discuss here how recent advances highlight the role of newly identified transport proteins, some that directly transfer Cl- into the xylem, and others that act on endomembranes in 'gatekeeper' cell types in the root stele to control root-to-shoot delivery of Cl-.
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Affiliation(s)
- Bo Li
- King Abdullah University of Science and Technology (KAUST), Division of Biological and Environmental Sciences and Engineering, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Mark Tester
- King Abdullah University of Science and Technology (KAUST), Division of Biological and Environmental Sciences and Engineering, Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Matthew Gilliham
- Plant Transport and Signalling Group, Australian Research Council (ARC) Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, SA 5064, Australia.
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16
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Baetz U, Eisenach C, Tohge T, Martinoia E, De Angeli A. Vacuolar Chloride Fluxes Impact Ion Content and Distribution during Early Salinity Stress. PLANT PHYSIOLOGY 2016; 172:1167-1181. [PMID: 27503602 PMCID: PMC5047071 DOI: 10.1104/pp.16.00183] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 07/21/2016] [Indexed: 05/24/2023]
Abstract
The ability to control the cytoplasmic environment is a prerequisite for plants to cope with changing environmental conditions. During salt stress, for instance, Na+ and Cl- are sequestered into the vacuole to help maintain cytosolic ion homeostasis and avoid cellular damage. It has been observed that vacuolar ion uptake is tied to fluxes across the plasma membrane. The coordination of both transport processes and relative contribution to plant adaptation, however, is still poorly understood. To investigate the link between vacuolar anion uptake and whole-plant ion distribution during salinity, we used mutants of the only vacuolar Cl- channel described to date: the Arabidopsis (Arabidopsis thaliana) ALMT9. After 24-h NaCl treatment, almt9 knock-out mutants had reduced shoot accumulation of both Cl- and Na+ In contrast, almt9 plants complemented with a mutant variant of ALMT9 that exhibits enhanced channel activity showed higher Cl- and Na+ accumulation. The altered shoot ion contents were not based on differences in transpiration, pointing to a vacuolar function in regulating xylem loading during salinity. In line with this finding, GUS staining demonstrated that ALMT9 is highly expressed in the vasculature of shoots and roots. RNA-seq analysis of almt9 mutants under salinity revealed specific expression profiles of transporters involved in long-distance ion translocation. Taken together, our study uncovers that the capacity of vacuolar Cl- loading in vascular cells plays a crucial role in controlling whole-plant ion movement rapidly after onset of salinity.
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Affiliation(s)
- Ulrike Baetz
- Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland (U.B., C.E., E.M.);Max-Planck-Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany (T.T.); and Institut de Biologie Intégrative de la Cellule, CNRS, 91190 Gif-Sur-Yvette, France (A.D.A.)
| | - Cornelia Eisenach
- Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland (U.B., C.E., E.M.);Max-Planck-Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany (T.T.); and Institut de Biologie Intégrative de la Cellule, CNRS, 91190 Gif-Sur-Yvette, France (A.D.A.)
| | - Takayuki Tohge
- Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland (U.B., C.E., E.M.);Max-Planck-Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany (T.T.); and Institut de Biologie Intégrative de la Cellule, CNRS, 91190 Gif-Sur-Yvette, France (A.D.A.)
| | - Enrico Martinoia
- Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland (U.B., C.E., E.M.);Max-Planck-Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany (T.T.); and Institut de Biologie Intégrative de la Cellule, CNRS, 91190 Gif-Sur-Yvette, France (A.D.A.)
| | - Alexis De Angeli
- Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland (U.B., C.E., E.M.);Max-Planck-Institute of Molecular Plant Physiology, 14476 Potsdam-Golm, Germany (T.T.); and Institut de Biologie Intégrative de la Cellule, CNRS, 91190 Gif-Sur-Yvette, France (A.D.A.)
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17
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Zhang XC, Gao HJ, Yang TY, Wu HH, Wang YM, Wan XC. Al(3+) -promoted fluoride accumulation in tea plants (Camellia sinensis) was inhibited by an anion channel inhibitor DIDS. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:4224-4230. [PMID: 26777729 DOI: 10.1002/jsfa.7626] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 12/03/2015] [Accepted: 01/07/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND Generally, tea plants are grown in acid soil which is rich in aluminum (Al) and fluoride (F). A recent publication showed that pretreatment with Al(3+) promoted F accumulation in tea plants by increasing endogenous Ca(2+) and calmodulin (CaM). A high level of F in tea leaves not only impairs tea quality but also might pose a health risk for people drinking tea regularly. Therefore it is important to try to find some clues which might be beneficial in controlling F accumulation in tea plants grown in acid soil (Al(3+) ). RESULTS It was found that diisothiocyanostilbene-2,2-disulfonic acid (DIDS) significantly reduced Al(3+) -promoted F accumulation in tea plants. Additionally, Al(3+) plus DIDS treatment stimulated significantly higher Ca(2+) efflux and decreased the CaM level in tea roots compared with Al(3+) treatment. Besides, significantly higher depolarization of membrane potential was shown in tea roots treated with Al(3+) plus DIDS than in those treated with Al(3+) , as well as higher net total H(+) efflux and plasma membrane H(+) -ATPase activity. CONCLUSION Al(3+) -promoted F accumulation in tea plants was inhibited by an anion channel inhibitor DIDS. Ca(2+) /CaM and membrane potential depolarization may be the components involved in this process. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Xian-Chen Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
| | - Hong-Jian Gao
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
- School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Tian-Yuan Yang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Hong-Hong Wu
- School of Land and Food, University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Yu-Mei Wang
- School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Xiao-Chun Wan
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China
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18
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Qiu J, Henderson SW, Tester M, Roy SJ, Gilliham M. SLAH1, a homologue of the slow type anion channel SLAC1, modulates shoot Cl- accumulation and salt tolerance in Arabidopsis thaliana. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:4495-505. [PMID: 27340232 PMCID: PMC4973733 DOI: 10.1093/jxb/erw237] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Salinity tolerance is correlated with shoot chloride (Cl(-)) exclusion in multiple crops, but the molecular mechanisms of long-distance Cl(-) transport are poorly defined. Here, we characterize the in planta role of AtSLAH1 (a homologue of the slow type anion channel-associated 1 (SLAC1)). This protein, localized to the plasma membrane of root stelar cells, has its expression reduced by salt or ABA, which are key predictions for a protein involved with loading Cl(-) into the root xylem. Artificial microRNA knockdown mutants of AtSLAH1 had significantly reduced shoot Cl(-) accumulation when grown under low Cl(-), whereas shoot Cl(-) increased and the shoot nitrate/chloride ratio decreased following AtSLAH1 constitutive or stelar-specific overexpression when grown in high Cl(-) In both sets of overexpression lines a significant reduction in shoot biomass over the null segregants was observed under high Cl(-) supply, but not low Cl(-) supply. Further in planta data showed AtSLAH3 overexpression increased the shoot nitrate/chloride ratio, consistent with AtSLAH3 favouring nitrate transport. Heterologous expression of AtSLAH1 in Xenopus laevis oocytes led to no detectible transport, suggesting the need for post-translational modifications for AtSLAH1 to be active. Our in planta data are consistent with AtSLAH1 having a role in controlling root-to-shoot Cl(-) transport.
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Affiliation(s)
- Jiaen Qiu
- School of Agriculture, Food, and Wine, University of Adelaide, PMB1, Glen Osmond, SA 5064, Australia Australian Centre for Plant Functional Genomics, PMB1, Glen Osmond, SA 5064, Australia ARC Centre of Excellence in Plant Energy Biology, PMB1, Glen Osmond, SA 5064, Australia
| | - Sam W Henderson
- School of Agriculture, Food, and Wine, University of Adelaide, PMB1, Glen Osmond, SA 5064, Australia ARC Centre of Excellence in Plant Energy Biology, PMB1, Glen Osmond, SA 5064, Australia
| | - Mark Tester
- Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Stuart J Roy
- School of Agriculture, Food, and Wine, University of Adelaide, PMB1, Glen Osmond, SA 5064, Australia Australian Centre for Plant Functional Genomics, PMB1, Glen Osmond, SA 5064, Australia
| | - Mathew Gilliham
- School of Agriculture, Food, and Wine, University of Adelaide, PMB1, Glen Osmond, SA 5064, Australia ARC Centre of Excellence in Plant Energy Biology, PMB1, Glen Osmond, SA 5064, Australia
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19
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Silent S-Type Anion Channel Subunit SLAH1 Gates SLAH3 Open for Chloride Root-to-Shoot Translocation. Curr Biol 2016; 26:2213-20. [PMID: 27397895 DOI: 10.1016/j.cub.2016.06.045] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 06/05/2016] [Accepted: 06/21/2016] [Indexed: 01/26/2023]
Abstract
Higher plants take up nutrients via the roots and load them into xylem vessels for translocation to the shoot. After uptake, anions have to be channeled toward the root xylem vessels. Thereby, xylem parenchyma and pericycle cells control the anion composition of the root-shoot xylem sap [1-6]. The fact that salt-tolerant genotypes possess lower xylem-sap Cl(-) contents compared to salt-sensitive genotypes [7-10] indicates that membrane transport proteins at the sites of xylem loading contribute to plant salinity tolerance via selective chloride exclusion. However, the molecular mechanism of xylem loading that lies behind the balance between NO3(-) and Cl(-) loading remains largely unknown. Here we identify two root anion channels in Arabidopsis, SLAH1 and SLAH3, that control the shoot NO3(-)/Cl(-) ratio. The AtSLAH1 gene is expressed in the root xylem-pole pericycle, where it co-localizes with AtSLAH3. Under high soil salinity, AtSLAH1 expression markedly declined and the chloride content of the xylem sap in AtSLAH1 loss-of-function mutants was half of the wild-type level only. SLAH3 anion channels are not active per se but require extracellular nitrate and phosphorylation by calcium-dependent kinases (CPKs) [11-13]. When co-expressed in Xenopus oocytes, however, the electrically silent SLAH1 subunit gates SLAH3 open even in the absence of nitrate- and calcium-dependent kinases. Apparently, SLAH1/SLAH3 heteromerization facilitates SLAH3-mediated chloride efflux from pericycle cells into the root xylem vessels. Our results indicate that under salt stress, plants adjust the distribution of NO3(-) and Cl(-) between root and shoot via differential expression and assembly of SLAH1/SLAH3 anion channel subunits.
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20
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Li B, Byrt C, Qiu J, Baumann U, Hrmova M, Evrard A, Johnson AAT, Birnbaum KD, Mayo GM, Jha D, Henderson SW, Tester M, Gilliham M, Roy SJ. Identification of a Stelar-Localized Transport Protein That Facilitates Root-to-Shoot Transfer of Chloride in Arabidopsis. PLANT PHYSIOLOGY 2016; 170:1014-29. [PMID: 26662602 PMCID: PMC4734554 DOI: 10.1104/pp.15.01163] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 12/04/2015] [Indexed: 05/18/2023]
Abstract
Under saline conditions, higher plants restrict the accumulation of chloride ions (Cl(-)) in the shoot by regulating their transfer from the root symplast into the xylem-associated apoplast. To identify molecular mechanisms underpinning this phenomenon, we undertook a transcriptional screen of salt stressed Arabidopsis (Arabidopsis thaliana) roots. Microarrays, quantitative RT-PCR, and promoter-GUS fusions identified a candidate gene involved in Cl(-) xylem loading from the Nitrate transporter 1/Peptide Transporter family (NPF2.4). This gene was highly expressed in the root stele compared to the cortex, and its expression decreased after exposure to NaCl or abscisic acid. NPF2.4 fused to fluorescent proteins, expressed either transiently or stably, was targeted to the plasma membrane. Electrophysiological analysis of NPF2.4 in Xenopus laevis oocytes suggested that NPF2.4 catalyzed passive Cl(-) efflux out of cells and was much less permeable to NO3(-). Shoot Cl(-) accumulation was decreased following NPF2.4 artificial microRNA knockdown, whereas it was increased by overexpression of NPF2.4. Taken together, these results suggest that NPF2.4 is involved in long-distance transport of Cl(-) in plants, playing a role in the loading and the regulation of Cl(-) loading into the xylem of Arabidopsis roots during salinity stress.
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Affiliation(s)
- Bo Li
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Caitlin Byrt
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Jiaen Qiu
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Ute Baumann
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Maria Hrmova
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Aurelie Evrard
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Alexander A T Johnson
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Kenneth D Birnbaum
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Gwenda M Mayo
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Deepa Jha
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Sam W Henderson
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Mark Tester
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Mathew Gilliham
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
| | - Stuart J Roy
- Australian Centre for Plant Functional Genomics (B.L., J.Q., U.B., M.H., A.E., D.J., M.T., S.J.R.), School of Agriculture, Food, and Wine (B.L., C.B., J.Q., U.B., M.H., A.E., G.M.M., D.J., S.W.H., M.T., M.G., S.J.R.), and ARC Centre of Excellence in Plant Energy Biology (C.B., J.Q., S.W.H., M.G.), University of Adelaide, SA 5064, Australia;Centre for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia (B.L., M.T.);School of BioSciences, University of Melbourne, Parkville, Vic 3010, Australia (A.A.T.J.); and Centre for Genomics and Systems Biology, New York University, New York 10003 (K.D.B.)
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Shabala S, Bose J, Fuglsang AT, Pottosin I. On a quest for stress tolerance genes: membrane transporters in sensing and adapting to hostile soils. JOURNAL OF EXPERIMENTAL BOTANY 2016; 67:1015-31. [PMID: 26507891 DOI: 10.1093/jxb/erv465] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Abiotic stresses such as salinity, drought, and flooding severely limit food and fibre production and result in penalties of in excess of US$100 billion per annum to the agricultural sector. Improved abiotic stress tolerance to these environmental constraints via traditional or molecular breeding practices requires a good understanding of the physiological and molecular mechanisms behind roots sensing of hostile soils, as well as downstream signalling cascades to effectors mediating plant adaptive responses to the environment. In this review, we discuss some common mechanisms conferring plant tolerance to these three major abiotic stresses. Central to our discussion are: (i) the essentiality of membrane potential maintenance and ATP production/availability and its use for metabolic versus adaptive responses; (ii) reactive oxygen species and Ca(2+) 'signatures' mediating stress signalling; and (iii) cytosolic K(+) as the common denominator of plant adaptive responses. We discuss in detail how key plasma membrane and tonoplast transporters are regulated by various signalling molecules and processes observed in plants under stress conditions (e.g. changes in membrane potential; cytosolic pH and Ca(2+); reactive oxygen species; polyamines; abscisic acid) and how these stress-induced changes are related to expression and activity of specific ion transporters. The reported results are then discussed in the context of strategies for breeding crops with improved abiotic stress tolerance. We also discuss a classical trade-off between tolerance and yield, and possible avenues for resolving this dilemma.
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Affiliation(s)
- Sergey Shabala
- School of Land and Food, University of Tasmania, Private Bag 54, Hobart, Tas 7001, Australia
| | - Jayakumar Bose
- School of Land and Food, University of Tasmania, Private Bag 54, Hobart, Tas 7001, Australia ARC Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia
| | - Anja Thoe Fuglsang
- Department of Plant and Environmental Science, University of Copenhagen, DK-1871 Frederiksberg, Denmark
| | - Igor Pottosin
- School of Land and Food, University of Tasmania, Private Bag 54, Hobart, Tas 7001, Australia Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, 28045 Colima, México
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Anion Channel Inhibitor NPPB-Inhibited Fluoride Accumulation in Tea Plant (Camellia sinensis) Is Related to the Regulation of Ca²⁺, CaM and Depolarization of Plasma Membrane Potential. Int J Mol Sci 2016; 17:ijms17010057. [PMID: 26742036 PMCID: PMC4730302 DOI: 10.3390/ijms17010057] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 12/20/2015] [Accepted: 12/22/2015] [Indexed: 11/16/2022] Open
Abstract
Tea plant is known to be a hyper-accumulator of fluoride (F). Over-intake of F has been shown to have adverse effects on human health, e.g., dental fluorosis. Thus, understanding the mechanisms fluoride accumulation and developing potential approaches to decrease F uptake in tea plants might be beneficial for human health. In the present study, we found that pretreatment with the anion channel inhibitor NPPB reduced F accumulation in tea plants. Simultaneously, we observed that NPPB triggered Ca(2+) efflux from mature zone of tea root and significantly increased relative CaM in tea roots. Besides, pretreatment with the Ca(2+) chelator (EGTA) and CaM antagonists (CPZ and TFP) suppressed NPPB-elevated cytosolic Ca(2+) fluorescence intensity and CaM concentration in tea roots, respectively. Interestingly, NPPB-inhibited F accumulation was found to be significantly alleviated in tea plants pretreated with either Ca(2+) chelator (EGTA) or CaM antagonists (CPZ and TFP). In addition, NPPB significantly depolarized membrane potential transiently and we argue that the net Ca(2+) and H⁺ efflux across the plasma membrane contributed to the restoration of membrane potential. Overall, our results suggest that regulation of Ca(2+)-CaM and plasma membrane potential depolarization are involved in NPPB-inhibited F accumulation in tea plants.
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Li B, Qiu J, Jayakannan M, Xu B, Li Y, Mayo GM, Tester M, Gilliham M, Roy SJ. AtNPF2.5 Modulates Chloride (Cl -) Efflux from Roots of Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2016; 7:2013. [PMID: 28111585 PMCID: PMC5216686 DOI: 10.3389/fpls.2016.02013] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 12/19/2016] [Indexed: 05/18/2023]
Abstract
The accumulation of high concentrations of chloride (Cl-) in leaves can adversely affect plant growth. When comparing different varieties of the same Cl- sensitive plant species those that exclude relatively more Cl- from their shoots tend to perform better under saline conditions; however, the molecular mechanisms involved in maintaining low shoot Cl- remain largely undefined. Recently, it was shown that the NRT1/PTR Family 2.4 protein (NPF2.4) loads Cl- into the root xylem, which affects the accumulation of Cl- in Arabidopsis shoots. Here we characterize NPF2.5, which is the closest homolog to NPF2.4 sharing 83.2% identity at the amino acid level. NPF2.5 is predominantly expressed in root cortical cells and its transcription is induced by salt. Functional characterisation of NPF2.5 via its heterologous expression in yeast (Saccharomyces cerevisiae) and Xenopus laevis oocytes indicated that NPF2.5 is likely to encode a Cl- permeable transporter. Arabidopsis npf2.5 T-DNA knockout mutant plants exhibited a significantly lower Cl- efflux from roots, and a greater Cl- accumulation in shoots compared to salt-treated Col-0 wild-type plants. At the same time, [Formula: see text] content in the shoot remained unaffected. Accumulation of Cl- in the shoot increased following (1) amiRNA-induced knockdown of NPF2.5 transcript abundance in the root, and (2) constitutive over-expression of NPF2.5. We suggest that both these findings are consistent with a role for NPF2.5 in modulating Cl- transport. Based on these results, we propose that NPF2.5 functions as a pathway for Cl- efflux from the root, contributing to exclusion of Cl- from the shoot of Arabidopsis.
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Affiliation(s)
- Bo Li
- Australian Centre for Plant Functional GenomicsAdelaide, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
- Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and TechnologyThuwal, Saudi Arabia
| | - Jiaen Qiu
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
- ARC Centre of Excellence in Plant Energy BiologyAdelaide, SA, Australia
| | - Maheswari Jayakannan
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
- ARC Centre of Excellence in Plant Energy BiologyAdelaide, SA, Australia
| | - Bo Xu
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
- ARC Centre of Excellence in Plant Energy BiologyAdelaide, SA, Australia
| | - Yuan Li
- Australian Centre for Plant Functional GenomicsAdelaide, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
| | - Gwenda M. Mayo
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
| | - Mark Tester
- Australian Centre for Plant Functional GenomicsAdelaide, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
- Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and TechnologyThuwal, Saudi Arabia
| | - Matthew Gilliham
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
- ARC Centre of Excellence in Plant Energy BiologyAdelaide, SA, Australia
- *Correspondence: Matthew Gilliham
| | - Stuart J. Roy
- Australian Centre for Plant Functional GenomicsAdelaide, SA, Australia
- School of Agriculture, Food and Wine, Waite Research Institute, University of AdelaideAdelaide, SA, Australia
- Stuart J. Roy
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Henderson SW, Wege S, Qiu J, Blackmore DH, Walker AR, Tyerman SD, Walker RR, Gilliham M. Grapevine and Arabidopsis Cation-Chloride Cotransporters Localize to the Golgi and Trans-Golgi Network and Indirectly Influence Long-Distance Ion Transport and Plant Salt Tolerance. PLANT PHYSIOLOGY 2015; 169:2215-29. [PMID: 26378102 PMCID: PMC4634049 DOI: 10.1104/pp.15.00499] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 09/14/2015] [Indexed: 05/20/2023]
Abstract
Plant cation-chloride cotransporters (CCCs) have been implicated in conferring salt tolerance. They are predicted to improve shoot salt exclusion by directly catalyzing the retrieval of sodium (Na(+)) and chloride (Cl(-)) ions from the root xylem. We investigated whether grapevine (Vitis vinifera [Vvi]) CCC has a role in salt tolerance by cloning and functionally characterizing the gene from the cultivar Cabernet Sauvignon. Amino acid sequence analysis revealed that VviCCC shares a high degree of similarity with other plant CCCs. A VviCCC-yellow fluorescent protein translational fusion protein localized to the Golgi and the trans-Golgi network and not the plasma membrane when expressed transiently in tobacco (Nicotiana benthamiana) leaves and Arabidopsis (Arabidopsis thaliana) mesophyll protoplasts. AtCCC-green fluorescent protein from Arabidopsis also localized to the Golgi and the trans-Golgi network. In Xenopus laevis oocytes, VviCCC targeted to the plasma membrane, where it catalyzed bumetanide-sensitive (36)Cl(-), (22)Na(+), and (86)Rb(+) uptake, suggesting that VviCCC (like AtCCC) belongs to the Na(+)-K(+)-2Cl(-) cotransporter class of CCCs. Expression of VviCCC in an Arabidopsis ccc knockout mutant abolished the mutant's stunted growth phenotypes and reduced shoot Cl(-) and Na(+) content to wild-type levels after growing plants in 50 mm NaCl. In grapevine roots, VviCCC transcript abundance was not regulated by Cl(-) treatment and was present at similar levels in both the root stele and cortex of three Vitis spp. genotypes that exhibit differential shoot salt exclusion. Our findings indicate that CCC function is conserved between grapevine and Arabidopsis, but neither protein is likely to directly mediate ion transfer with the xylem or have a direct role in salt tolerance.
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Affiliation(s)
- Sam W Henderson
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
| | - Stefanie Wege
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
| | - Jiaen Qiu
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
| | - Deidre H Blackmore
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
| | - Amanda R Walker
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
| | - Stephen D Tyerman
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
| | - Rob R Walker
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
| | - Matthew Gilliham
- Australian Research Council Centre of Excellence in Plant Energy Biology and the University of Adelaide School of Agriculture, Food and Wine (S.W.H., S.W., J.Q., S.D.T., M.G.) andCommonwealth Scientific and Industrial Research Organization Agriculture (D.H.B., A.R.W., R.R.W.), Waite Research Precinct, Glen Osmond, South Australia 5064, Australia
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Zhang XC, Gao HJ, Wu HH, Yang TY, Zhang ZZ, Mao JD, Wan XC. Ca(2+) and CaM are involved in Al(3+) pretreatment-promoted fluoride accumulation in tea plants (Camellia sinesis L.). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2015; 96:288-295. [PMID: 26318146 DOI: 10.1016/j.plaphy.2015.08.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 08/10/2015] [Accepted: 08/11/2015] [Indexed: 06/04/2023]
Abstract
Tea plant (Camellia sinensis (L.) O. kuntze) is known to be a fluoride (F) and aluminum (Al(3+)) hyper-accumulator. Previous study showed that pre-treatment of Al(3+) caused a significant increase of F accumulation in tea plants. However, less is known about the intricate network of Al(3+) promoted F accumulation in tea plants. In this study, the involvement of endogenous Ca(2+) and CaM in Al(3+) pretreatment-promoted F accumulation in tea plants was investigated. Our results showed that Al(3+) induced the inverse change of intracellular Ca(2+) fluorescence intensity and stimulated Ca(2+) trans-membrane transport in the mature zone of tea root. Also, a link between internal Ca(2+) and CaM was found in tea roots under the presence of Al(3+). In order to investigate whether Ca(2+) and CaM were related to F accumulation promoted by Al(3+) pretreatment, Ca(2+) chelator EGTA and CaM antagonists CPZ and TFP were used. EGTA, CPZ, and TFP pretreatment inhibited Al(3+)-induced increase of Ca(2+) fluorescence intensity and CaM content in tea roots, and also significantly reduced Al(3+)-promoted F accumulation in tea plants. Taken together, our results suggested that the endogenous Ca(2+) and CaM are involved in Al(3+) pretreatment-promoted F accumulation in tea roots.
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Affiliation(s)
- Xian-Chen Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China.
| | - Hong-Jian Gao
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China; School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
| | - Hong-Hong Wu
- School of Land and Food, University of Tasmania, Hobart, Tasmania 7001, Australia.
| | - Tian-Yuan Yang
- College of Resource & Environment Science, Nanjing Agricultural University, Nanjing 210095, China.
| | - Zheng-Zhu Zhang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China.
| | - Jing-Dong Mao
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529, USA.
| | - Xiao-Chun Wan
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China.
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Le Deunff E, Malagoli P. Breaking conceptual locks in modelling root absorption of nutrients: reopening the thermodynamic viewpoint of ion transport across the root. ANNALS OF BOTANY 2014; 114:1555-70. [PMID: 25425406 PMCID: PMC4416131 DOI: 10.1093/aob/mcu203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 08/29/2014] [Indexed: 05/13/2023]
Abstract
BACKGROUND The top-down analysis of nitrate influx isotherms through the Enzyme-Substrate interpretation has not withstood recent molecular and histochemical analyses of nitrate transporters. Indeed, at least four families of nitrate transporters operating at both high and/or low external nitrate concentrations, and which are located in series and/or parallel in the different cellular layers of the mature root, are involved in nitrate uptake. Accordingly, the top-down analysis of the root catalytic structure for ion transport from the Enzyme-Substrate interpretation of nitrate influx isotherms is inadequate. Moreover, the use of the Enzyme-Substrate velocity equation as a single reference in agronomic models is not suitable in its formalism to account for variations in N uptake under fluctuating environmental conditions. Therefore, a conceptual paradigm shift is required to improve the mechanistic modelling of N uptake in agronomic models. SCOPE An alternative formalism, the Flow-Force theory, was proposed in the 1970s to describe ion isotherms based upon biophysical 'flows and forces' relationships of non-equilibrium thermodynamics. This interpretation describes, with macroscopic parameters, the patterns of N uptake provided by a biological system such as roots. In contrast to the Enzyme-Substrate interpretation, this approach does not claim to represent molecular characteristics. Here it is shown that it is possible to combine the Flow-Force formalism with polynomial responses of nitrate influx rate induced by climatic and in planta factors in relation to nitrate availability. CONCLUSIONS Application of the Flow-Force formalism allows nitrate uptake to be modelled in a more realistic manner, and allows scaling-up in time and space of the regulation of nitrate uptake across the plant growth cycle.
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Affiliation(s)
- Erwan Le Deunff
- Université de Caen Basse-Normandie, UMR EVA, F-14032 Caen cedex, France INRA, UMR 950, Écophysiologie Végétale & Agronomie Nutritions NCS, F-14032 Caen cedex, France
| | - Philippe Malagoli
- Université Blaise Pascal-INRA, 24, avenue des Landais, BP 80 006, F-63177 Aubière, France INRA, UMR 547 PIAF, Bâtiment Biologie Végétale Recherche, BP 80 006, F-63177 Aubière, France
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Henderson SW, Baumann U, Blackmore DH, Walker AR, Walker RR, Gilliham M. Shoot chloride exclusion and salt tolerance in grapevine is associated with differential ion transporter expression in roots. BMC PLANT BIOLOGY 2014; 14:273. [PMID: 25344057 PMCID: PMC4220414 DOI: 10.1186/s12870-014-0273-8] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Accepted: 10/03/2014] [Indexed: 05/22/2023]
Abstract
BACKGROUND Salt tolerance in grapevine is associated with chloride (Cl-) exclusion from shoots; the rate-limiting step being the passage of Cl- between the root symplast and xylem apoplast. Despite an understanding of the physiological mechanism of Cl- exclusion in grapevine, the molecular identity of membrane proteins that control this process have remained elusive. To elucidate candidate genes likely to control Cl- exclusion, we compared the root transcriptomes of three Vitis spp. with contrasting shoot Cl- exclusion capacities using a custom microarray. RESULTS When challenged with 50 mM Cl-, transcriptional changes of genotypes 140 Ruggeri (shoot Cl- excluding rootstock), K51-40 (shoot Cl- including rootstock) and Cabernet Sauvignon (intermediate shoot Cl- excluder) differed. The magnitude of salt-induced transcriptional changes in roots correlated with the amount of Cl- accumulated in shoots. Abiotic-stress responsive transcripts (e.g. heat shock proteins) were induced in 140 Ruggeri, respiratory transcripts were repressed in Cabernet Sauvignon, and the expression of hypersensitive response and ROS scavenging transcripts was altered in K51-40. Despite these differences, no obvious Cl- transporters were identified. However, under control conditions where differences in shoot Cl- exclusion between rootstocks were still significant, genes encoding putative ion channels SLAH3, ALMT1 and putative kinases SnRK2.6 and CPKs were differentially expressed between rootstocks, as were members of the NRT1 (NAXT1 and NRT1.4), and CLC families. CONCLUSIONS These results suggest that transcriptional events contributing to the Cl- exclusion mechanism in grapevine are not stress-inducible, but constitutively different between contrasting varieties. We have identified individual genes from large families known to have members with roles in anion transport in other plants, as likely candidates for controlling anion homeostasis and Cl- exclusion in Vitis species. We propose these genes as priority candidates for functional characterisation to determine their role in chloride transport in grapevine and other plants.
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Affiliation(s)
- Sam W Henderson
- />Australian Research Council Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, & Waite Research Institute, University of Adelaide, PMB1, Glen Osmond, South Australia, 5064 Australia
| | - Ute Baumann
- />Australian Centre for Plant Functional Genomics, South Australia, 5064 Australia
| | - Deidre H Blackmore
- />CSIRO Plant Industry, PO Box 350, Glen Osmond, South Australia 5064 Australia
| | - Amanda R Walker
- />CSIRO Plant Industry, PO Box 350, Glen Osmond, South Australia 5064 Australia
| | - Rob R Walker
- />CSIRO Plant Industry, PO Box 350, Glen Osmond, South Australia 5064 Australia
| | - Matthew Gilliham
- />Australian Research Council Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, & Waite Research Institute, University of Adelaide, PMB1, Glen Osmond, South Australia, 5064 Australia
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Zhang HS, Qin FF, Qin P, Pan SM. Evidence that arbuscular mycorrhizal and phosphate-solubilizing fungi alleviate NaCl stress in the halophyte Kosteletzkya virginica: nutrient uptake and ion distribution within root tissues. MYCORRHIZA 2014; 24:383-95. [PMID: 24343115 DOI: 10.1007/s00572-013-0546-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Accepted: 11/20/2013] [Indexed: 05/08/2023]
Abstract
The effects of an arbuscular mycorrhizal (AM) fungus, Glomus mosseae, and a phosphate-solubilizing microorganism (PSM), Mortierella sp., and their interactions, on nutrient (N, P and K) uptake and the ionic composition of different root tissues of the halophyte Kosteletzkya virginica (L.), cultured with or without NaCl, were evaluated. Plant biomass, AM colonization and PSM populations were also assessed. Salt stress adversely affected plant nutrient acquisition, especially root P and K, resulting in an important reduction in shoot dry biomass. Inoculation of the AM fungus or/and PSM strongly promoted AM colonization, PSM populations, plant dry biomass, root/shoot dry weight ratio and nutrient uptake by K. virginica, regardless of salinity level. Ion accumulation in root tissues was inhibited by salt stress. However, dual inoculation of the AM fungus and PSM significantly enhanced ion (e.g., Na(+), Cl(-), K(+), Ca(2+), Mg(2+)) accumulation in different root tissues, and maintained lower Na(+)/K(+) and Ca(2+)/Mg(2+) ratios and a higher Na(+)/Ca(2+) ratio, compared to non-inoculated plants under 100 mM NaCl conditions. Correlation coefficient analysis demonstrated that plant (shoot or root) dry biomass correlated positively with plant nutrient uptake and ion (e.g., Na(+), K(+), Mg(2+) and Cl(-)) concentrations of different root tissues, and correlated negatively with Na(+)/K(+) ratios in the epidermis and cortex. Simultaneously, root/shoot dry weight ratio correlated positively with Na(+)/Ca(2+) ratios in most root tissues. These findings suggest that combined AM fungus and PSM inoculation alleviates the deleterious effects of salt on plant growth by enabling greater nutrient (e.g., P, N and K) absorption, higher accumulation of Na(+), K(+), Mg(2+) and Cl(-) in different root tissues, and maintenance of lower root Na(+)/K(+) and higher Na(+)/Ca(2+) ratios when salinity is within acceptable limits.
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Affiliation(s)
- Huan Shi Zhang
- Halophyte Research Laboratory, Nanjing University, 22 Hankou Road, Nanjing, 210093, China
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Tang X, Mu X, Shao H, Wang H, Brestic M. Global plant-responding mechanisms to salt stress: physiological and molecular levels and implications in biotechnology. Crit Rev Biotechnol 2014; 35:425-37. [PMID: 24738851 DOI: 10.3109/07388551.2014.889080] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The increasing seriousness of salinization aggravates the food, population and environmental issues. Ameliorating the salt-resistance of plants especially the crops is the most effective measure to solve the worldwide problem. The salinity can cause damage to plants mainly from two aspects: hyperosmotic and hyperionic stresses leading to the restrain of growth and photosynthesis. To the adverse effects, the plants derive corresponding strategies including: ion regulation and compartmentalization, biosynthesis of compatible solutes, induction of antioxidant enzymes and plant hormones. With the development of molecular biology, our understanding of the molecular and physiology knowledge is becoming clearness. The complex signal transduction underlying the salt resistance is being illuminated brighter and clearer. The SOS pathway is the central of the cell signaling in salt stress. The accumulation of the compatible solutes and the activation of the antioxidant system are the effective measures for plants to enhance the salt resistance. How to make full use of our understanding to improve the output of crops is a huge challenge for us, yet the application of the genetic engineering makes this possible. In this review, we will discuss the influence of the salt stress and the response of the plants in detail expecting to provide a particular account for the plant resistance in molecular, physiological and transgenic fields.
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Affiliation(s)
- Xiaoli Tang
- a Key Laboratory of Coastal Biology & Bioresources Utilization , Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS) , Yantai , China .,b University of Chinese Academy of Sciences , Beijing , China
| | - Xingmin Mu
- c Institute of Soil and Water Conservation, Northwest A&F University , Yangling , China .,d Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources , Yangling , China
| | - Hongbo Shao
- a Key Laboratory of Coastal Biology & Bioresources Utilization , Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS) , Yantai , China .,c Institute of Soil and Water Conservation, Northwest A&F University , Yangling , China .,d Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources , Yangling , China .,e Institute for Life Sciences, Qingdao University of Science & Technology (QUST) , Qingdao , China , and
| | - Hongyan Wang
- a Key Laboratory of Coastal Biology & Bioresources Utilization , Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS) , Yantai , China .,b University of Chinese Academy of Sciences , Beijing , China
| | - Marian Brestic
- a Key Laboratory of Coastal Biology & Bioresources Utilization , Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS) , Yantai , China .,f Department of Plant Physiology , Slovak Agricultural University , Nitra , Slovak Republic
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Abstract
Plant anion channels allow the efflux of anions from cells. They are involved in turgor pressure control, changes in membrane potential, organic acid excretion, tolerance to salinity and inorganic anion nutrition. The recent molecular identification of anion channel genes in guard cells and in roots allows a better understanding of their function and of the mechanisms that control their activation.
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Affiliation(s)
- Hannes Kollist
- Institute of Technology, University of Tartu, Tartu, Estonia
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31
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Mumm P, Wolf T, Fromm J, Roelfsema MRG, Marten I. Cell type-specific regulation of ion channels within the maize stomatal complex. PLANT & CELL PHYSIOLOGY 2011; 52:1365-75. [PMID: 21690176 DOI: 10.1093/pcp/pcr082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The stomatal complex of Zea mays is composed of two pore-forming guard cells and two adjacent subsidiary cells. For stomatal movement, potassium ions and anions are thought to shuttle between these two cell types. As potential cation transport pathways, K(+)-selective channels have already been identified and characterized in subsidiary cells and guard cells. However, so far the nature and regulation of anion channels in these cell types have remained unclear. In order to bridge this gap, we performed patch-clamp experiments with subsidiary cell and guard cell protoplasts. Voltage-independent anion channels were identified in both cell types which, surprisingly, exhibited different, cell-type specific dependencies on cytosolic Ca(2+) and pH. After impaling subsidiary cells of intact maize plants with microelectrodes and loading with BCECF [(2',7'-bis-(2-carboxyethyl)-5(and6)carboxyflurescein] as a fluorescent pH indicator, the regulation of ion channels by the cytosolic pH and the membrane voltage was further examined. Stomatal closure was found to be accompanied by an initial hyperpolarization and cytosolic acidification of subsidiary cells, while opposite responses were observed during stomatal opening. Our findings suggest that specific changes in membrane potential and cytosolic pH are likely to play a role in determining the direction and capacity of ion transport in subsidiary cells.
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Affiliation(s)
- Patrick Mumm
- University of Würzburg, Department of Molecular Plant Physiology and Biophysics, Julius-von-Sachs-Institute, Julius-von-Sachs-Platz 2, D-97082 Würzburg, Germany
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32
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Tavares B, Domingos P, Dias PN, Feijó JA, Bicho A. The essential role of anionic transport in plant cells: the pollen tube as a case study. JOURNAL OF EXPERIMENTAL BOTANY 2011; 62:2273-2298. [PMID: 21511914 DOI: 10.1093/jxb/err036] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Plasma membrane anion transporters play fundamental roles in plant cell biology, especially in stomatal closure and nutrition. Notwithstanding, a lot is still unknown about the specific function of these transporters, their specific localization, or molecular nature. Here the fundamental roles of anionic transport in plant cells are reviewed. Special attention will be paid to them in the control of pollen tube growth. Pollen tubes are extreme examples of cellular polarity as they grow exclusively in their apical extremity. Their unique cell biology has been extensively exploited for fundamental understanding of cellular growth and morphogenesis. Non-invasive methods have demonstrated that tube growth is governed by different ion fluxes, with different properties and distribution. Not much is known about the nature of the membrane transporters responsible for anionic transport and their regulation in the pollen tube. Recent data indicate the importance of chloride (Cl(-)) transfer across the plasma membrane for pollen germination and pollen tube growth. A general overview is presented of the well-known accumulated data in terms of biophysical and functional characterization, transcriptomics, and genomic description of pollen ionic transport, and the various controversies around the role of anionic fluxes during pollen tube germination, growth, and development. It is concluded that, like all other plant cells so far analysed, pollen tubes depend on anion fluxes for a number of fundamental homeostatic properties.
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Gilliham M, Dayod M, Hocking BJ, Xu B, Conn SJ, Kaiser BN, Leigh RA, Tyerman SD. Calcium delivery and storage in plant leaves: exploring the link with water flow. JOURNAL OF EXPERIMENTAL BOTANY 2011; 62:2233-50. [PMID: 21511913 DOI: 10.1093/jxb/err111] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Calcium (Ca) is a unique macronutrient with diverse but fundamental physiological roles in plant structure and signalling. In the majority of crops the largest proportion of long-distance calcium ion (Ca(2+)) transport through plant tissues has been demonstrated to follow apoplastic pathways, although this paradigm is being increasingly challenged. Similarly, under certain conditions, apoplastic pathways can dominate the proportion of water flow through plants. Therefore, tissue Ca supply is often found to be tightly linked to transpiration. Once Ca is deposited in vacuoles it is rarely redistributed, which results in highly transpiring organs amassing large concentrations of Ca ([Ca]). Meanwhile, the nutritional flow of Ca(2+) must be regulated so it does not interfere with signalling events. However, water flow through plants is itself regulated by Ca(2+), both in the apoplast via effects on cell wall structure and stomatal aperture, and within the symplast via Ca(2+)-mediated gating of aquaporins which regulates flow across membranes. In this review, an integrated model of water and Ca(2+) movement through plants is developed and how this affects [Ca] distribution and water flow within tissues is discussed, with particular emphasis on the role of aquaporins.
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Affiliation(s)
- Matthew Gilliham
- Waite Research Institute, School of Agriculture, Food and Wine, University of Adelaide, PMB1, Glen Osmond, SA, 5064, Australia
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34
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Brumós J, Talón M, Bouhlal R, Colmenero-Flores JM. Cl- homeostasis in includer and excluder citrus rootstocks: transport mechanisms and identification of candidate genes. PLANT, CELL & ENVIRONMENT 2010; 33:2012-27. [PMID: 20573047 DOI: 10.1111/j.1365-3040.2010.02202.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
To reveal specific Cl(-) transport activities in the symplastic pathway, uptake, long-distance transport and distribution of Cl(-) have been investigated in the citrus rootstocks Carrizo citrange (CC, Cl(-) includer) and Cleopatra mandarin (CM, Cl(-) excluder). Using an external concentration of 4.5 mm Cl(-) , both species actively transported Cl(-) to levels that exceeded the critical requirement concentration by one and two orders of magnitude in the excluder and the includer rootstocks, respectively. Both CC and CM modulated Cl(-) influx according to the availability of the nutrient as uptake capacity was induced by Cl(-) starvation, but inhibited after Cl(-) resupply. Net Cl(-) uptake was higher in the includer CC, an observation that correlated with a lower root-to-shoot transport capacity in the excluder CM. The patterns of tissue Cl(-) accumulation indicated that chloride exclusion in the salt-tolerant rootstock CM was caused by a reduced net Cl(-) loading into the root xylem. Genes CcCCC1, CcSLAH1 and CcICln1 putatively involved in the regulation of chloride transport were isolated and their expression analysed in response to both changes in the nutritional status of Cl(-) and salt stress. The previously uncharacterized ICln gene exhibited a strong repression to Cl(-) application in the excluder rootstock, suggesting a role in regulating Cl(-) homeostasis in plants.
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Affiliation(s)
- Javier Brumós
- Instituto Valenciano de Investigaciones Agrarias, Centro de Genómica, Valencia, Spain
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35
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Peuke AD. Correlations in concentrations, xylem and phloem flows, and partitioning of elements and ions in intact plants. A summary and statistical re-evaluation of modelling experiments in Ricinus communis. JOURNAL OF EXPERIMENTAL BOTANY 2010; 61:635-55. [PMID: 20032109 DOI: 10.1093/jxb/erp352] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Within the last two decades, a series of papers have dealt with the effects of nutrition and nutrient deficiency, as well as salt stress, on the long-distance transport and partitioning of nutrients in castor bean. Flows in xylem and phloem were modelled according to an empirically-based modelling technique that permits additional quantification of the uptake and incorporation into plant organs. In the present paper these data were statistically re-evaluated, and new correlations are presented. Numerous relationships between different compartments and transport processes for single elements, but also between elements, were detected. These correlations revealed different selectivities for ions in bulk net transport. Generally, increasing chemical concentration gradients for mineral nutrients from the rhizosphere to the root and from the xylem to leaf tissue were observed, while such gradients decreased from root tissue to the xylem and from leaves to the phloem. These studies showed that, for the partitioning of nutrients within a plant, the correlated interactions of uptake, xylem and phloem flow, as well as loading and unloading of solutes from transport systems, are of central importance. For essential nutrients, tight correlations between uptake, xylem and phloem flow, and the resulting partitioning of elements, were observed, which allows the stating of general models. For non-essential ions like Na(+) or Cl(-), a statistically significant dependence of xylem transport on uptake was not detected. The central role of the phloem for adjusting, but also signalling, of nutrition status is discussed, since strong correlations between leaf nutrient concentrations and those in phloem saps were observed. In addition, negative correlations between phloem sap sugar concentration and net-photosynthesis, growth, and uptake of nutrients were demonstrated. The question remains whether this is only a consequence of an insufficient use of carbohydrates in plants or a ubiquitous signal for stress in plants. In general, high sugar concentrations in phloem saps indicate (nutritional) stress, and high nutrient concentrations in phloem saps indicate nutritional sufficiency of leaf tissues.
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Affiliation(s)
- Andreas D Peuke
- ADP International Plant Science Consulting, Talstrasse 8, D-79194 Gundelfingen-Wildtal, Germany.
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36
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Møller IS, Gilliham M, Jha D, Mayo GM, Roy SJ, Coates JC, Haseloff J, Tester M. Shoot Na+ exclusion and increased salinity tolerance engineered by cell type-specific alteration of Na+ transport in Arabidopsis. THE PLANT CELL 2009; 21:2163-78. [PMID: 19584143 PMCID: PMC2729596 DOI: 10.1105/tpc.108.064568] [Citation(s) in RCA: 320] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2008] [Revised: 05/18/2009] [Accepted: 06/09/2009] [Indexed: 05/18/2023]
Abstract
Soil salinity affects large areas of cultivated land, causing significant reductions in crop yield globally. The Na+ toxicity of many crop plants is correlated with overaccumulation of Na+ in the shoot. We have previously suggested that the engineering of Na+ exclusion from the shoot could be achieved through an alteration of plasma membrane Na+ transport processes in the root, if these alterations were cell type specific. Here, it is shown that expression of the Na+ transporter HKT1;1 in the mature root stele of Arabidopsis thaliana decreases Na+ accumulation in the shoot by 37 to 64%. The expression of HKT1;1 specifically in the mature root stele is achieved using an enhancer trap expression system for specific and strong overexpression. The effect in the shoot is caused by the increased influx, mediated by HKT1;1, of Na+ into stelar root cells, which is demonstrated in planta and leads to a reduction of root-to-shoot transfer of Na+. Plants with reduced shoot Na+ also have increased salinity tolerance. By contrast, plants constitutively expressing HKT1;1 driven by the cauliflower mosaic virus 35S promoter accumulated high shoot Na+ and grew poorly. Our results demonstrate that the modification of a specific Na+ transport process in specific cell types can reduce shoot Na+ accumulation, an important component of salinity tolerance of many higher plants.
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Affiliation(s)
- Inge S Møller
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom
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37
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Miller AJ, Shen Q, Xu G. Freeways in the plant: transporters for N, P and S and their regulation. CURRENT OPINION IN PLANT BIOLOGY 2009; 12:284-90. [PMID: 19481499 DOI: 10.1016/j.pbi.2009.04.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Revised: 04/21/2009] [Accepted: 04/22/2009] [Indexed: 05/13/2023]
Abstract
This review focuses on plant acquisition and transport of the inorganic forms of nitrogen, phosphorus and sulfur. Families of membrane transporters have been identified and several members are well characterised. Although some families are large, specific members may be expressed in a particular membrane or cell type, or at certain times during development. Therefore, each transporter can have specific activities and the concept of functional redundancy is questionable. Structurally related proteins can mediate all transport steps within the plant, including uptake from the soil. Although transport mechanisms and membrane locations may be different, a picture is emerging that suggests sequence homology can be a reasonable indicator of the nutrient that is transported by each protein.
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Affiliation(s)
- Anthony J Miller
- Centre for Soils and Ecosystem Function, Rothamsted Research, Hertfordshire, UK.
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38
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Lin SH, Kuo HF, Canivenc G, Lin CS, Lepetit M, Hsu PK, Tillard P, Lin HL, Wang YY, Tsai CB, Gojon A, Tsay YF. Mutation of the Arabidopsis NRT1.5 nitrate transporter causes defective root-to-shoot nitrate transport. THE PLANT CELL 2008; 20:2514-28. [PMID: 18780802 PMCID: PMC2570733 DOI: 10.1105/tpc.108.060244] [Citation(s) in RCA: 316] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2008] [Revised: 08/28/2008] [Accepted: 09/02/2008] [Indexed: 05/18/2023]
Abstract
Little is known about the molecular and regulatory mechanisms of long-distance nitrate transport in higher plants. NRT1.5 is one of the 53 Arabidopsis thaliana nitrate transporter NRT1 (Peptide Transporter PTR) genes, of which two members, NRT1.1 (CHL1 for Chlorate resistant 1) and NRT1.2, have been shown to be involved in nitrate uptake. Functional analysis of cRNA-injected Xenopus laevis oocytes showed that NRT1.5 is a low-affinity, pH-dependent bidirectional nitrate transporter. Subcellular localization in plant protoplasts and in planta promoter-beta-glucuronidase analysis, as well as in situ hybridization, showed that NRT1.5 is located in the plasma membrane and is expressed in root pericycle cells close to the xylem. Knockdown or knockout mutations of NRT1.5 reduced the amount of nitrate transported from the root to the shoot, suggesting that NRT1.5 participates in root xylem loading of nitrate. However, root-to-shoot nitrate transport was not completely eliminated in the NRT1.5 knockout mutant, and reduction of NRT1.5 in the nrt1.1 background did not affect root-to-shoot nitrate transport. These data suggest that, in addition to that involving NRT1.5, another mechanism is responsible for xylem loading of nitrate. Further analyses of the nrt1.5 mutants revealed a regulatory loop between nitrate and potassium at the xylem transport step.
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Affiliation(s)
- Shan-Hua Lin
- Institute of Molecular Biology, Academia Sinica, Taipei 11529, Taiwan
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39
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de Boulois HD, Joner EJ, Leyval C, Jakobsen I, Chen BD, Roos P, Thiry Y, Rufyikiri G, Delvaux B, Declerck S. Role and influence of mycorrhizal fungi on radiocesium accumulation by plants. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2008; 99:785-800. [PMID: 18055077 DOI: 10.1016/j.jenvrad.2007.10.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/18/2007] [Indexed: 05/25/2023]
Abstract
This review summarizes current knowledge on the contribution of mycorrhizal fungi to radiocesium immobilization and plant accumulation. These root symbionts develop extended hyphae in soils and readily contribute to the soil-to-plant transfer of some nutrients. Available data show that ecto-mycorrhizal (ECM) fungi can accumulate high concentration of radiocesium in their extraradical phase while radiocesium uptake and accumulation by arbuscular mycorrhizal (AM) fungi is limited. Yet, both ECM and AM fungi can transport radiocesium to their host plants, but this transport is low. In addition, mycorrhizal fungi could thus either store radiocesium in their intraradical phase or limit its root-to-shoot translocation. The review discusses the impact of soil characteristics, and fungal and plant transporters on radiocesium uptake and accumulation in plants, as well as the potential role of mycorrhizal fungi in phytoremediation strategies.
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Affiliation(s)
- H Dupré de Boulois
- Université catholique de Louvain, Unité de Microbiologie, Croix du Sud 3, 1348 Louvain-la-Neuve, Belgium
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40
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KAUR V, BEHL RK, SHINANO T, OSAKI M. Interacting effects of high temperature and drought stresses in wheat genotypes under semiarid tropics- an appraisal. TROPICS 2008. [DOI: 10.3759/tropics.17.225] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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41
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Abstract
The physiological and molecular mechanisms of tolerance to osmotic and ionic components of salinity stress are reviewed at the cellular, organ, and whole-plant level. Plant growth responds to salinity in two phases: a rapid, osmotic phase that inhibits growth of young leaves, and a slower, ionic phase that accelerates senescence of mature leaves. Plant adaptations to salinity are of three distinct types: osmotic stress tolerance, Na(+) or Cl() exclusion, and the tolerance of tissue to accumulated Na(+) or Cl(). Our understanding of the role of the HKT gene family in Na(+) exclusion from leaves is increasing, as is the understanding of the molecular bases for many other transport processes at the cellular level. However, we have a limited molecular understanding of the overall control of Na(+) accumulation and of osmotic stress tolerance at the whole-plant level. Molecular genetics and functional genomics provide a new opportunity to synthesize molecular and physiological knowledge to improve the salinity tolerance of plants relevant to food production and environmental sustainability.
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Affiliation(s)
- Rana Munns
- CSIRO Plant Industry, Canberra, ACT, Australia.
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42
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Piñeros MA, Cançado GMA, Maron LG, Lyi SM, Menossi M, Kochian LV. Not all ALMT1-type transporters mediate aluminum-activated organic acid responses: the case of ZmALMT1 - an anion-selective transporter. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2008; 53:352-67. [PMID: 18069943 DOI: 10.1111/j.1365-313x.2007.03344.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The phytotoxic effects of aluminum (Al) on root systems of crop plants constitute a major agricultural problem in many areas of the world. Root exudation of Al-chelating molecules such as low-molecular-weight organic acids has been shown to be an important mechanism of plant Al tolerance/resistance. Differences observed in the physiology and electrophysiology of root function for two maize genotypes with contrasting Al tolerance revealed an association between rates of Al-activated root organic acid release and Al tolerance. Using these genotypes, we cloned ZmALMT1, a maize gene homologous to the wheat ALMT1 and Arabidopsis AtALMT1 genes that have recently been described as encoding functional, Al-activated transporters that play a role in tolerance by mediating Al-activated organic acid exudation in roots. The ZmALMT1 cDNA encodes a 451 amino acid protein containing six transmembrane helices. Transient expression of a ZmALMT1::GFP chimera confirmed that the protein is targeted to the plant cell plasma membrane. We addressed whether ZmALMT1 might underlie the Al-resistance response (i.e. Al-activated citrate exudation) observed in the roots of the Al-tolerant genotype. The physiological, gene expression and functional data from this study confirm that ZmALMT1 is a plasma membrane transporter that is capable of mediating elective anion efflux and influx. However, gene expression data as well as biophysical transport characteristics obtained from Xenopus oocytes expressing ZmALMT1 indicate that this transporter is implicated in the selective transport of anions involved in mineral nutrition and ion homeostasis processes, rather than mediating a specific Al-activated citrate exudation response at the rhizosphere of maize roots.
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Affiliation(s)
- Miguel A Piñeros
- United States Plant, Soil, and Nutrition Laboratory, United States Department of Agriculture-Agricultural Research Service, Cornell University, Ithaca, NY 14853-2901, USA.
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43
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Köhler B. Step by step: deciphering ion transport in the root xylem parenchyma. PLANT SIGNALING & BEHAVIOR 2007; 2:303-305. [PMID: 19704629 PMCID: PMC2634158 DOI: 10.4161/psb.2.4.4068] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2007] [Accepted: 02/22/2007] [Indexed: 05/27/2023]
Abstract
Proton pumps produce electrical potential differences and differences in pH across the plasma membrane of cells which drive secondary ion transport through sym- and antiporters. We used the patch-clamp technique to characterize an H(+)-pump in the xylem parenchyma of barley roots. This cell type is of special interest with respect to xylem loading. Since it has been an ongoing debate whether xylem loading is a passive or an active process, the functional characterization of the H(+)-pump is of major interest in the context of previous work on ion channels through which passive salt efflux into the xylem vessels could occur. Cell-type specific features like its Ca(2+) dependence were determined, that are important to interpret its physiological role and eventually to model xylem loading. We conclude that the electrogenic pump in the xylem parenchyma does not participate directly in the transfer of KCl and KNO(3) to the xylem but, in combination with short-circuiting conductances, plays a crucial role in controlling xylem unloading and loading through modulation of the voltage difference across the plasma membrane. Here, our recent results on the H(+) pump are put in a larger context and open questions are highlighted.
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44
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de Angeli A, Thomine S, Frachisse JM, Ephritikhine G, Gambale F, Barbier-Brygoo H. Anion channels and transporters in plant cell membranes. FEBS Lett 2007; 581:2367-74. [PMID: 17434490 DOI: 10.1016/j.febslet.2007.04.003] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2007] [Revised: 04/01/2007] [Accepted: 04/02/2007] [Indexed: 11/29/2022]
Abstract
Anion channels/transporters appear as key players in signaling pathways leading to the adaptation of plant cells to abiotic and biotic environmental stresses, in the control of metabolism and in the maintenance of electrochemical gradients. Focusing on the most recent advances, this review aims at providing a description of the role of these channels in various physiological functions such as control of stomatal movements, plant-pathogen interaction, xylem loading, compartmentalization of metabolites and coupling with proton gradients. These functions have been demonstrated by a combination of electrophysiology, pharmacology and genetics approaches, the key issue being to identify the corresponding proteins and genes.
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Affiliation(s)
- Alexis de Angeli
- Institut des Sciences du Végétal, UPR 2355, CNRS, 1 Avenue de la Terrasse, 91198 Gif sur Yvette Cedex, France
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Colmenero-Flores JM, Martínez G, Gamba G, Vázquez N, Iglesias DJ, Brumós J, Talón M. Identification and functional characterization of cation-chloride cotransporters in plants. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2007; 50:278-92. [PMID: 17355435 DOI: 10.1111/j.1365-313x.2007.03048.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Chloride (Cl(-)) is an essential nutrient and one of the most abundant inorganic anions in plant tissues. We have cloned an Arabidopsis thaliana cDNA encoding for a member of the cation-Cl(-) cotransporter (CCC) family. Deduced plant CCC proteins are highly conserved, and phylogenetic analyses revealed their relationships to the sub-family of animal K(+):Cl(-) cotransporters. In Xenopus laevis oocytes, the A. thaliana CCC protein (At CCC) catalysed the co-ordinated symport of K(+), Na(+) and Cl(-), and this transport activity was inhibited by the 'loop' diuretic bumetanide, a specific inhibitor of vertebrate Na(+):K(+):Cl(-) cotransporters, indicating that At CCC encodes for a bona fide Na(+):K(+):Cl(-) cotransporter. Analysis of At CCC promoter-beta-glucuronidase transgenic Arabidopsis plants revealed preferential expression in the root and shoot vasculature at the xylem/symplast boundary, root tips, trichomes, leaf hydathodes, leaf stipules and anthers. Plants homozygous for two independent T-DNA insertions in the CCC gene exhibited shorter organs such as inflorescence stems, roots, leaves and siliques. The elongation zone of the inflorescence stem of ccc plants often necrosed during bolt emergence, while seed production was strongly impaired. In addition, ccc plants exhibited defective Cl(-) homeostasis under high salinity, as they accumulated higher and lower Cl(-) amounts in shoots and roots, respectively, than the treated wild type, suggesting At CCC involvement in long-distance Cl(-) transport. Compelling evidence is provided on the occurrence of cation-chloride cotransporters in the plant kingdom and their significant role in major plant developmental processes and Cl(-) homeostasis.
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Affiliation(s)
- José M Colmenero-Flores
- Centro de Genómica, Instituto Valenciano de Investigaciones Agrarias, Ctra. Moncada-Náquera Km. 5, 46113 Moncada, Valencia, Spain
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DHANDA SS, BEHL RK, SHINANO T, OSAKI M. Wheat improvement under water deficit conditions in semi arid tropics and subtropics. TROPICS 2007. [DOI: 10.3759/tropics.16.181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
| | - Rishi Kumar BEHL
- Department of Plant Breeding, CCS Haryana Agricultural University
| | - Takuro SHINANO
- Creative research Initiative “Sousei” (CRIS), Hokkaido University
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Wolf T, Heidelmann T, Marten I. ABA regulation of K(+)-permeable channels in maize subsidiary cells. PLANT & CELL PHYSIOLOGY 2006; 47:1372-80. [PMID: 16973684 DOI: 10.1093/pcp/pcl007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
An antiparallel-directed potassium transport between subsidiary cells and guard cells which form the graminean stomatal complex has been proposed to drive stomatal movements in maize. To gain insights into the coordinated shuttling of K(+) ions between these cell types during stomatal closure, the effect of ABA on the time-dependent K(+) uptake and K(+) release channels as well as on the instantaneously activating non-selective cation channels (MgC) was examined in subsidiary cells. Patch-clamp studies revealed that ABA did not affect the MgC channels but differentially regulated the time-dependent K(+) channels. ABA caused a pronounced rise in time-dependent outward-rectifying K(+) currents (K(out)) at alkaline pH and decreased inward-rectifying K(+) currents (K(in)) in a Ca(2+)-dependent manner. Our results show that the ABA-induced changes in time-dependent K(in) and K(out) currents from subsidiary cells are very similar to those previously described for guard cells. Thus, the direction of K(+) transport in subsidiary cells and guard cells during ABA-induced closure does not seem to be grounded solely on the cell type-specific ABA regulation of K(+) channels.
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Affiliation(s)
- Thomas Wolf
- University of Wuerzburg, Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Bioscience, Julius-von-Sachs-Platz 2, D-97082 Wuerzburg, Germany
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Zhao FJ, Jiang RF, Dunham SJ, McGrath SP. Cadmium uptake, translocation and tolerance in the hyperaccumulator Arabidopsis halleri. THE NEW PHYTOLOGIST 2006; 172:646-54. [PMID: 17096791 DOI: 10.1111/j.1469-8137.2006.01867.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Arabidopsis halleri is a well-known zinc (Zn) hyperaccumulator, but its status as a cadmium (Cd) hyperaccumulator is less certain. Here, we investigated whether A. halleri can hyperaccumulate Cd and whether Cd is transported via the Zn pathway. Growth and Cd and Zn uptake were determined in hydroponic experiments with different Cd and Zn concentrations. Short-term uptake and root-to-shoot transport were measured with radioactive 109Cd and 65Zn labelling. A. halleri accumulated > 1000 mg Cd kg(-1) in shoot dry weight at external Cd concentrations >or= 5 microm, but the short-term uptake rate of 109Cd was much lower than that of 65Zn. Zinc inhibited short-term 109Cd uptake kinetics and root-to-shoot translocation, as well as long-term Cd accumulation in shoots. Uptake of 109Cd and 65Zn were up-regulated, respectively, by low iron (Fe) or Zn status. A. halleri was much less tolerant to Cd than to Zn. We conclude that A. halleri is able to hyperaccumulate Cd partly, at least, through the Zn pathway, but the mechanisms responsible for cellular Zn tolerance cannot detoxify Cd effectively.
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Affiliation(s)
- F J Zhao
- Agriculture and Environment Division, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK.
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Roberts SK. Plasma membrane anion channels in higher plants and their putative functions in roots. THE NEW PHYTOLOGIST 2006; 169:647-66. [PMID: 16441747 DOI: 10.1111/j.1469-8137.2006.01639.x] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Recent years have seen considerable progress in identifying anion channel activities in higher plant cells. This review outlines the functional properties of plasma membrane anion channels in plant cells and discusses their likely roles in root function. Plant anion channels can be grouped according to their voltage dependence and kinetics: (1) depolarization-activated anion channels which mediate either anion efflux (R and S types) or anion influx (outwardly rectifying type); (2) hyperpolarization-activated anion channels which mediate anion efflux, and (3) anion channels activated by light or membrane stretch. These types of anion channel are apparent in root cells where they may function in anion homeostasis, membrane stabilization, osmoregulation, boron tolerance and regulation of passive salt loading into the xylem vessels. In addition, roots possess anion channels exhibiting unique properties which are consistent with them having specialized functions in root physiology. Most notable are the organic anion selective channels, which are regulated by extracellular Al3+ or the phosphate status of the plant. Finally, although the molecular identities of plant anion channels remain elusive, the diverse electrophysiological properties of plant anion channels suggest that large and diverse multigene families probably encode these channels.
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Affiliation(s)
- Stephen K Roberts
- Lancaster Environment Centre, Biology Department, Lancaster University, Lancaster LA1 4YQ, UK.
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Tester M, Bacic A. Abiotic stress tolerance in grasses. From model plants to crop plants. PLANT PHYSIOLOGY 2005; 137:791-3. [PMID: 15761207 PMCID: PMC1065378 DOI: 10.1104/pp.104.900138] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Affiliation(s)
- Mark Tester
- Australian Centre for Plant Functional Genomics, Glen Osmond, South Australia 5064, Australia.
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