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Liu M, Zhang Q, Jin R, Zhao P, Zhu X, Wang J, Yu Y, Tang Z. The Role of IAA in Regulating Root Architecture of Sweetpotato ( Ipomoea batatas [L.] Lam) in Response to Potassium Deficiency Stress. PLANTS (BASEL, SWITZERLAND) 2023; 12:plants12091779. [PMID: 37176837 PMCID: PMC10181447 DOI: 10.3390/plants12091779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 04/21/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023]
Abstract
Plants can adapt to the spatial heterogeneity of soil nutrients by changing the morphology and architecture of the root system. Here, we explored the role of auxin in the response of sweetpotato roots to potassium (K+) deficiency stress. Two sweetpotato cultivars, Xushu 32 (low-K-tolerant) and Ningzishu 1 (low-K-sensitive), were cultured in low K+ (0.1 mmol L-1, LK) and normal K+ (10 mmol L-1, CK) nutrient solutions. Compared with CK, LK reduced the dry mass, K+ content, and K+ accumulation in the two cultivars, but the losses of Xushu 32 were smaller than those of Ningzishu 1. LK also affected root growth, mainly impairing the length, surface area, forks number, and crossings number. However, Xushu 32 had significantly higher lateral root length, density, and surface area than Ningzishu 1, closely related to the roots' higher indole-3-acetic acid (IAA) content. According to the qPCR results, Xushu 32 synthesized more IAA (via IbYUC8 and IbTAR2) in leaves but transported and accumulated in roots through polar transport (via IbPIN1, IbPIN3, and IbAUX1). It was also associated with the upregulation of auxin signaling pathway genes (IbIAA4 and IbIAA8) in roots. These results imply that IAA participates in the formation of lateral roots and the change in root architecture during the tolerance to low K+ stress of sweetpotato, thus improving the absorption of K+ and the formation of biomass.
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Affiliation(s)
- Ming Liu
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
- School of Life Sciences, Jiangsu Normal University, Xuzhou 221116, China
| | - Qiangqiang Zhang
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
| | - Rong Jin
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
| | - Peng Zhao
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
| | - Xiaoya Zhu
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
| | - Jing Wang
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
| | - Yongchao Yu
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
| | - Zhonghou Tang
- Xuzhou Institute of Agricultural Sciences of Xuhuai District of Jiangsu Province, China/Key Laboratory of Sweet Potato Biology and Genetic Breeding, Ministry of Agriculture/National Agricultural Experimental Station for Soil Quality, Xuzhou 221000, China
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Mircea DM, Estrelles E, Al Hassan M, Soriano P, Sestras RE, Boscaiu M, Sestras AF, Vicente O. Effect of Water Deficit on Germination, Growth and Biochemical Responses of Four Potentially Invasive Ornamental Grass Species. PLANTS (BASEL, SWITZERLAND) 2023; 12:1260. [PMID: 36986948 PMCID: PMC10053442 DOI: 10.3390/plants12061260] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 03/04/2023] [Accepted: 03/08/2023] [Indexed: 06/19/2023]
Abstract
Ornamental plant species introduced into new environments can exhibit an invasive potential and adaptability to abiotic stress factors. In this study, the drought stress responses of four potentially invasive ornamental grass species (Cymbopogon citratus, Cortaderia selloana, Pennisetum alopecuroides and P. setaceum) were analysed. Several seed germination parameters were determined under increasing polyethylene glycol (PEG 6000) concentrations. Additionally, plants in the vegetative stage were subjected to intermediate and severe water stress treatments for four weeks. All species registered high germination rates in control conditions (no stress treatment), even at high PEG concentrations, except C. citratus, which did not germinate at -1 MPa osmotic potential. Upon applying the water stress treatments, P. alopecuroides plants showed the highest tolerance, and C. citratus appeared the most susceptible to drought. Stress-induced changes in several biochemical markers (photosynthetic pigments, osmolytes, antioxidant compounds, root and shoot Na+ and K+ contents), highlighted different responses depending on the species and the stress treatments. Basically, drought tolerance seems to depend to a large extent on the active transport of Na+ and K+ cations to the aerial part of the plants, contributing to osmotic adjustment in all four species and, in the case of the most tolerant P. alopecuroides, on the increasing root K+ concentration under water deficit conditions. The study shows the invasive potential of all species, except C. citratus, in dry areas such as the Mediterranean region, especially in the current climate change scenario. Particular attention should be given to P. alopecuroides, which is widely commercialised in Europe as ornamental.
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Affiliation(s)
- Diana M. Mircea
- Department of Forestry, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 3-5 Manastur Street, 400372 Cluj-Napoca, Romania;
- Institute for the Conservation and Improvement of Valencian Agrodiversity (COMAV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Elena Estrelles
- Cavanilles Institute of Biodiversity and Evolutionary Biology, Botanical Garden, University of Valencia, Quart, 80, 46008 Valencia, Spain; (E.E.); (P.S.)
| | - Mohamad Al Hassan
- Laboratory of Plant Breeding, Wageningen University and Research (WUR), Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands;
- Department of Plant Sciences, Aeres University of Applied Sciences, 8251 JZ Dronten, The Netherlands
| | - Pilar Soriano
- Cavanilles Institute of Biodiversity and Evolutionary Biology, Botanical Garden, University of Valencia, Quart, 80, 46008 Valencia, Spain; (E.E.); (P.S.)
| | - Radu E. Sestras
- Department of Horticulture and Landscape, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 3-5 Manastur Street, 400372 Cluj-Napoca, Romania;
| | - Monica Boscaiu
- Mediterranean Agroforestry Institute (IAM), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;
| | - Adriana F. Sestras
- Department of Forestry, University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, 3-5 Manastur Street, 400372 Cluj-Napoca, Romania;
| | - Oscar Vicente
- Institute for the Conservation and Improvement of Valencian Agrodiversity (COMAV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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De la Peña M, Marín-Peña AJ, Urmeneta L, Coleto I, Castillo-González J, van Liempd SM, Falcón-Pérez JM, Álvarez-Fernández A, González-Moro MB, Marino D. Ammonium nutrition interacts with iron homeostasis in Brachypodium distachyon. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:263-274. [PMID: 34570887 DOI: 10.1093/jxb/erab427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Most plant species develop stress symptoms when exposed to high ammonium (NH4+) concentrations. The root is the first organ in contact with high NH4+ and therefore the first barrier to cope with ammonium stress. In this work, we focused on root adaptation to ammonium nutrition in the model plant Brachypodium distachyon. Proteome analysis revealed changes associated with primary metabolism, cell wall remodelling, and redox homeostasis. In addition, it showed a strong induction of proteins related to methionine (Met) metabolism and phytosiderophore (PS) synthesis in ammonium-fed plants. In agreement with this, we show how ammonium nutrition impacts Met/S-adenosyl-Met and PS metabolic pathways together with increasing root iron content. Nevertheless, ammonium-fed plants displayed higher sensitivity to iron deficiency, suggesting that ammonium nutrition triggers impaired iron utilization and root to shoot transport, which entailed an induction in iron-related responses. Overall, this work demonstrates the importance of iron homeostasis during ammonium nutrition and paves a new way to better understand and improve ammonium use efficiency and tolerance.
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Affiliation(s)
- Marlon De la Peña
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), E-48940, Leioa,Spain
| | - Agustín Javier Marín-Peña
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), E-48940, Leioa,Spain
| | - Leyre Urmeneta
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), E-48940, Leioa,Spain
| | - Inmaculada Coleto
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), E-48940, Leioa,Spain
| | - Jorge Castillo-González
- Department of Plant Nutrition, Aula Dei Experimental Station, Consejo Superior de Investigaciones Científicas (EEAD-CSIC), E-50059, Zaragoza,Spain
| | | | - Juan M Falcón-Pérez
- Metabolomics Platform, CIC bioGUNE-BRTA, Derio,Spain
- Centro de Investigación Biomédica en Red de enfermedades hepáticas y digestivas (CIBERehd), Madrid,Spain
- Ikerbasque, Basque Foundation for Science, E-48011 Bilbao,Spain
| | - Ana Álvarez-Fernández
- Department of Plant Nutrition, Aula Dei Experimental Station, Consejo Superior de Investigaciones Científicas (EEAD-CSIC), E-50059, Zaragoza,Spain
| | - María Begoña González-Moro
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), E-48940, Leioa,Spain
| | - Daniel Marino
- Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), E-48940, Leioa,Spain
- Ikerbasque, Basque Foundation for Science, E-48011 Bilbao,Spain
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Sehar S, Adil MF, Zeeshan M, Holford P, Cao F, Wu F, Wang Y. Mechanistic Insights into Potassium-Conferred Drought Stress Tolerance in Cultivated and Tibetan Wild Barley: Differential Osmoregulation, Nutrient Retention, Secondary Metabolism and Antioxidative Defense Capacity. Int J Mol Sci 2021; 22:ijms222313100. [PMID: 34884904 PMCID: PMC8658718 DOI: 10.3390/ijms222313100] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 11/23/2022] Open
Abstract
Keeping the significance of potassium (K) nutrition in focus, this study explores the genotypic responses of two wild Tibetan barley genotypes (drought tolerant XZ5 and drought sensitive XZ54) and one drought tolerant barley cv. Tadmor, under the exposure of polyethylene glycol-induced drought stress. The results revealed that drought and K deprivation attenuated overall plant growth in all the tested genotypes; however, XZ5 was least affected due to its ability to retain K in its tissues which could be attributed to the smallest reductions of photosynthetic parameters, relative chlorophyll contents and the lowest Na+/K+ ratios in all treatments. Our results also indicate that higher H+/K+-ATPase activity (enhancement of 1.6 and 1.3-fold for shoot; 1.4 and 2.5-fold for root), higher shoot K+ (2 and 2.3-fold) and Ca2+ content (1.5 and 1.7-fold), better maintenance of turgor pressure by osmolyte accumulation and enhanced antioxidative performance to scavenge ROS, ultimately suppress lipid peroxidation (in shoots: 4% and 35%; in roots 4% and 20% less) and bestow higher tolerance to XZ5 against drought stress in comparison with Tadmor and XZ54, respectively. Conclusively, this study adds further evidence to support the concept that Tibetan wild barley genotypes that utilize K efficiently could serve as a valuable genetic resource for the provision of genes for improved K metabolism in addition to those for combating drought stress, thereby enabling the development of elite barley lines better tolerant of abiotic stresses.
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Affiliation(s)
- Shafaque Sehar
- Department of Agronomy, Zijingang Campus, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (S.S.); (M.F.A.); (M.Z.); (F.C.); (F.W.)
| | - Muhammad Faheem Adil
- Department of Agronomy, Zijingang Campus, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (S.S.); (M.F.A.); (M.Z.); (F.C.); (F.W.)
| | - Muhammad Zeeshan
- Department of Agronomy, Zijingang Campus, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (S.S.); (M.F.A.); (M.Z.); (F.C.); (F.W.)
| | - Paul Holford
- Hawkesbury Campus, School of Science and Health, University of Western Sydney, Penrith, NSW 2751, Australia;
| | - Fangbin Cao
- Department of Agronomy, Zijingang Campus, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (S.S.); (M.F.A.); (M.Z.); (F.C.); (F.W.)
| | - Feibo Wu
- Department of Agronomy, Zijingang Campus, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (S.S.); (M.F.A.); (M.Z.); (F.C.); (F.W.)
- Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
- Provincial Key Laboratory of Crop Germplasm, Zhejiang University, Hangzhou 310058, China
| | - Yizhou Wang
- Department of Agronomy, Zijingang Campus, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China; (S.S.); (M.F.A.); (M.Z.); (F.C.); (F.W.)
- Provincial Key Laboratory of Crop Germplasm, Zhejiang University, Hangzhou 310058, China
- Correspondence:
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Britto DT, Coskun D, Kronzucker HJ. Potassium physiology from Archean to Holocene: A higher-plant perspective. JOURNAL OF PLANT PHYSIOLOGY 2021; 262:153432. [PMID: 34034042 DOI: 10.1016/j.jplph.2021.153432] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 04/22/2021] [Accepted: 04/22/2021] [Indexed: 05/27/2023]
Abstract
In this paper, we discuss biological potassium acquisition and utilization processes over an evolutionary timescale, with emphasis on modern vascular plants. The quintessential osmotic and electrical functions of the K+ ion are shown to be intimately tied to K+-transport systems and membrane energization. Several prominent themes in plant K+-transport physiology are explored in greater detail, including: (1) channel mediated K+ acquisition by roots at low external [K+]; (2) K+ loading of root xylem elements by active transport; (3) variations on the theme of K+ efflux from root cells to the extracellular environment; (4) the veracity and utility of the "affinity" concept in relation to transport systems. We close with a discussion of the importance of plant-potassium relations to our human world, and current trends in potassium nutrition from farm to table.
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Affiliation(s)
- Dev T Britto
- Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada; School of BioSciences, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Devrim Coskun
- Département de Phytologie, Faculté des Sciences de l'Agriculture et de l'Alimentation (FSAA), Université Laval, Québec, QC, G1V 0A6, Canada
| | - Herbert J Kronzucker
- Faculty of Land and Food Systems, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada; School of BioSciences, The University of Melbourne, Parkville, Victoria, 3010, Australia.
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Kocourková D, Krčková Z, Pejchar P, Kroumanová K, Podmanická T, Daněk M, Martinec J. Phospholipase Dα1 mediates the high-Mg 2+ stress response partially through regulation of K + homeostasis. PLANT, CELL & ENVIRONMENT 2020; 43:2460-2475. [PMID: 32583878 DOI: 10.1111/pce.13831] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 06/13/2020] [Accepted: 06/14/2020] [Indexed: 05/28/2023]
Abstract
Intracellular levels of Mg2+ are tightly regulated, as Mg2+ deficiency or excess affects normal plant growth and development. In Arabidopsis, we determined that phospholipase Dα1 (PLDα1) is involved in the stress response to high-magnesium conditions. The T-DNA insertion mutant pldα1 is hypersensitive to increased concentrations of magnesium, exhibiting reduced primary root length and fresh weight. PLDα1 activity increases rapidly after high-Mg2+ treatment, and this increase was found to be dose dependent. Two lines harbouring mutations in the HKD motif, which is essential for PLDα1 activity, displayed the same high-Mg2+ hypersensitivity of pldα1 plants. Moreover, we show that high concentrations of Mg2+ disrupt K+ homeostasis, and that transcription of K+ homeostasis-related genes CIPK9 and HAK5 is impaired in pldα1. Additionally, we found that the akt1, hak5 double mutant is hypersensitive to high-Mg2+ . We conclude that in Arabidopsis, the enzyme activity of PLDα1 is vital in the response to high-Mg2+ conditions, and that PLDα1 mediates this response partially through regulation of K+ homeostasis.
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Affiliation(s)
- Daniela Kocourková
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czech Republic
| | - Zuzana Krčková
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czech Republic
| | - Přemysl Pejchar
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czech Republic
| | - Kristýna Kroumanová
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czech Republic
| | - Tereza Podmanická
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czech Republic
| | - Michal Daněk
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czech Republic
| | - Jan Martinec
- Institute of Experimental Botany of the Czech Academy of Sciences, Prague, Czech Republic
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Zou N, Huang L, Chen H, Huang X, Song Q, Yang Q, Wang T. Nitrogen form plays an important role in the growth of moso bamboo ( Phyllostachys edulis) seedlings. PeerJ 2020; 8:e9938. [PMID: 32995091 PMCID: PMC7501804 DOI: 10.7717/peerj.9938] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 08/24/2020] [Indexed: 11/29/2022] Open
Abstract
Background This study aimed to gain an understanding of the growth response of Phyllostachys edulis (moso bamboo) seedlings to nitrogen (N) and potassium (K) to benefit nutrient management practices and the design of proper fertilizer in nursery cultivation. Methods An orthogonal array L8(4×24) was used to study the effects of N forms (NH4+, NO3−), N concentrations (8, 32 mmol/L), and K+concentrations (0, 0.5, 1.5, 3 mmol/L) on seedling height, leaf number, chlorophyll content (SPAD value), biomass, root systems, and N content of P. edulis seedlings. Plants were grown in vermiculite under controlled greenhouse conditions. Results Our study showed that N form played a significant role in the overall performance of P. edulis seedlings, followed by the effect of N and K+ concentrations. Among the N forms, NH4+ significantly improved the growth of P. edulis seedlings compared with NO3−. Seedling height, leaf number, chlorophyll SPAD value, biomass, and root system architecture (root length, root surface area, root volume, and root tips) were greater with 8 mmol/L of NH4+ treatments than with 32 mmol/L of NH4+treatments, whereas root diameter and N content of P. edulis seedlings were higher with 32 mmol/L of NH4+ than with 8 mmol/L of NH4+. K displayed inconsistent effects on the growth of P. edulis seedlings. Specifically, seedling height, leaf number, biomass and root volume increased when the K+ concentration was increased from 0 to 0.5 mmol/L, followed by a decrease when the K+ concentration was further increased from 0.5 to 3 mmol/L. Root average diameter of the seedlings was the highest with a K+ concentration of 1.5 mmol/L, and K had some inhibitory effects on the chlorophyll SPAD value of the seedlings. P. edulis seedlings performed well with 8 mmol/L NH4+and further tolerated a higher concentration of both NH4+ and NO3−, although excessive N could inhibit seedling growth. A lower concertation of K (≤ 0.5 mmol/L) promoted seedling growth and increasing K+ concentration in the nutrient solution did not alleviate the inhibitory effect of high N on the growth of P. edulis seedlings. Therefore, NH4+nitrogen as the main form of N fertilizer, together with a low concertation of K+, should be supplied in the cultivation and nutrient management practices of moso bamboo.
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Affiliation(s)
- Na Zou
- College of Landscape and Art, Jiangxi Agricultural University, Nanchang, Jiangxi, China.,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Ling Huang
- College of Landscape and Art, Jiangxi Agricultural University, Nanchang, Jiangxi, China.,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Huijing Chen
- College of Landscape and Art, Jiangxi Agricultural University, Nanchang, Jiangxi, China.,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Xiaofeng Huang
- College of Landscape and Art, Jiangxi Agricultural University, Nanchang, Jiangxi, China.,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Qingni Song
- College of Landscape and Art, Jiangxi Agricultural University, Nanchang, Jiangxi, China.,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Qingpei Yang
- College of Landscape and Art, Jiangxi Agricultural University, Nanchang, Jiangxi, China.,Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang, Jiangxi, China
| | - Tianchi Wang
- The New Zealand Institute for Plant & Food Research Limited (Plant & Food Research), Auckland, New Zealand
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The Effects of Fertilization on the Growth and Physiological Characteristics of Ginkgo biloba L. FORESTS 2016. [DOI: 10.3390/f7120293] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Coskun D, Britto DT, Kochian LV, Kronzucker HJ. How high do ion fluxes go? A re-evaluation of the two-mechanism model of K(+) transport in plant roots. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2016; 243:96-104. [PMID: 26795154 DOI: 10.1016/j.plantsci.2015.12.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 12/04/2015] [Accepted: 12/08/2015] [Indexed: 05/21/2023]
Abstract
Potassium (K(+)) acquisition in roots is generally described by a two-mechanism model, consisting of a saturable, high-affinity transport system (HATS) operating via H(+)/K(+) symport at low (<1mM) external [K(+)] ([K(+)]ext), and a linear, low-affinity system (LATS) operating via ion channels at high (>1mM) [K(+)]ext. Radiotracer measurements in the LATS range indicate that the linear rise in influx continues well beyond nutritionally relevant concentrations (>10mM), suggesting K(+) transport may be pushed to extraordinary, and seemingly limitless, capacity. Here, we assess this rise, asking whether LATS measurements faithfully report transmembrane fluxes. Using (42)K(+)-isotope and electrophysiological methods in barley, we show that this flux is part of a K(+)-transport cycle through the apoplast, and masks a genuine plasma-membrane influx that displays Michaelis-Menten kinetics. Rapid apoplastic cycling of K(+) is corroborated by an absence of transmembrane (42)K(+) efflux above 1mM, and by the efflux kinetics of PTS, an apoplastic tracer. A linear apoplastic influx, masking a saturating transmembrane influx, was also found in Arabidopsis mutants lacking the K(+) transporters AtHAK5 and AtAKT1. Our work significantly revises the model of K(+) transport by demonstrating a surprisingly modest upper limit for plasma-membrane influx, and offers insight into sodium transport under salt stress.
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Affiliation(s)
- Devrim Coskun
- Department of Biological Sciences & Canadian Centre for World Hunger Research (CCWHR), University of Toronto, Toronto, Ontario M1C 1A4, Canada.
| | - Dev T Britto
- Department of Biological Sciences & Canadian Centre for World Hunger Research (CCWHR), University of Toronto, Toronto, Ontario M1C 1A4, Canada.
| | - Leon V Kochian
- Robert W. Holley Center for Agriculture and Health, USDA-ARS, Cornell University, Ithaca, New York 14853, USA.
| | - Herbert J Kronzucker
- Department of Biological Sciences & Canadian Centre for World Hunger Research (CCWHR), University of Toronto, Toronto, Ontario M1C 1A4, Canada.
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10
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Garcia K, Zimmermann SD. The role of mycorrhizal associations in plant potassium nutrition. FRONTIERS IN PLANT SCIENCE 2014; 5:337. [PMID: 25101097 PMCID: PMC4101882 DOI: 10.3389/fpls.2014.00337] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 06/25/2014] [Indexed: 05/05/2023]
Abstract
Potassium (K(+)) is one of the most abundant elements of soil composition but it's very low availability limits plant growth and productivity of ecosystems. Because this cation participates in many biological processes, its constitutive uptake from soil solution is crucial for the plant cell machinery. Thus, the understanding of strategies responsible of K(+) nutrition is a major issue in plant science. Mycorrhizal associations occurring between roots and hyphae of underground fungi improve hydro-mineral nutrition of the majority of terrestrial plants. The contribution of this mutualistic symbiosis to the enhancement of plant K(+) nutrition is not well understood and poorly studied so far. This mini-review examines the current knowledge about the impact of both arbuscular mycorrhizal and ectomycorrhizal symbioses on the transfer of K(+) from the soil to the plants. A model summarizing plant and fungal transport systems identified and hypothetically involved in K(+) transport is proposed. In addition, some data related to benefits for plants provided by the improvement of K(+) nutrition thanks to mycorrhizal symbioses are presented.
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Affiliation(s)
| | - Sabine D. Zimmermann
- Biochimie et Physiologie Moléculaire des Plantes, UMR 5004 CNRS/INRA/SupAgro/UM2Montpellier, France
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