1
|
Chandwadkar P, Acharya C. Inorganic polyphosphate accumulation protects a marine, filamentous cyanobacterium, Anabaena torulosa against uranium toxicity. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2023; 263:107185. [PMID: 37094505 DOI: 10.1016/j.jenvrad.2023.107185] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 03/28/2023] [Accepted: 04/14/2023] [Indexed: 05/03/2023]
Abstract
The intricate dynamics of inorganic polyphosphate (polyP) in response to phosphorus (P) limitation and metal exposure typical of contaminated aquatic environments is poorly understood. Cyanobacteria are important primary producers in aquatic environments that are exposed to P stringency as well as metal contamination. There is a growing concern regarding migration of uranium, generated as a result of anthropogenic activities, into the aquatic environments owing to high mobility and solubility of stable aqueous complexes of uranyl ions. The polyP metabolism in cyanobacteria in context of uranium (U) exposure under P limitation has hardly been explored. In this study, we analyzed the polyP dynamics in a marine, filamentous cyanobacterium Anabaena torulosa under combination of variable phosphate concentrations (overplus and deficient) and uranyl exposure conditions typical of marine environments. Polyphosphate accumulation (polyP+) or deficient (polyP-) conditions were physiologically synthesized in the A. torulosa cultures and were ascertained by (a) toulidine blue staining followed by their visualization using bright field microscopy and (b) scanning electron microscopy in combination with energy dispersive X-ray spectroscopy (SEM/EDX). On exposure to 100 μM of uranyl carbonate at pH 7.8, it was observed that the growth of polyP+ cells under phosphate limitation was hardly affected and these cells exhibited larger amounts of uranium binding as compared to polyP- cells of A. torulosa. In contrast, the polyP- cells displayed extensive lysis when exposed to similar U exposure. Our findings suggest that polyP accumulation played an important role in conferring uranium tolerance in the marine cyanobacterium, A. torulosa. The polyP-mediated uranium tolerance and binding could serve as a suitable strategy for remediation of uranium contamination in aquatic environments.
Collapse
Affiliation(s)
- Pallavi Chandwadkar
- Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - Celin Acharya
- Molecular Biology Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India; Homi Bhabha National Institute, Anushakti Nagar, Mumbai, India.
| |
Collapse
|
2
|
Xiao M, Burford MA, Wood SA, Aubriot L, Ibelings BW, Prentice MJ, Galvanese EF, Harris TD, Hamilton DP. Schindler's legacy: from eutrophic lakes to the phosphorus utilization strategies of cyanobacteria. FEMS Microbiol Rev 2022; 46:fuac029. [PMID: 35749580 PMCID: PMC9629505 DOI: 10.1093/femsre/fuac029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 06/01/2022] [Accepted: 06/22/2022] [Indexed: 01/09/2023] Open
Abstract
David Schindler and his colleagues pioneered studies in the 1970s on the role of phosphorus in stimulating cyanobacterial blooms in North American lakes. Our understanding of the nuances of phosphorus utilization by cyanobacteria has evolved since that time. We review the phosphorus utilization strategies used by cyanobacteria, such as use of organic forms, alternation between passive and active uptake, and luxury storage. While many aspects of physiological responses to phosphorus of cyanobacteria have been measured, our understanding of the critical processes that drive species diversity, adaptation and competition remains limited. We identify persistent critical knowledge gaps, particularly on the adaptation of cyanobacteria to low nutrient concentrations. We propose that traditional discipline-specific studies be adapted and expanded to encompass innovative new methodologies and take advantage of interdisciplinary opportunities among physiologists, molecular biologists, and modellers, to advance our understanding and prediction of toxic cyanobacteria, and ultimately to mitigate the occurrence of blooms.
Collapse
Affiliation(s)
- Man Xiao
- Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia
- Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing, Jiangsu, 210008, China
| | - Michele A Burford
- Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia
| | - Susanna A Wood
- Coastal and Freshwater Group, Cawthron Institute, Nelson, 7010, New Zealand
| | - Luis Aubriot
- Phytoplankton Physiology and Ecology Group, Sección Limnología, Instituto de Ecología y Ciencias Ambientales, Facultad de Ciencias; Universidad de la República, Montevideo, 11400, Uruguay
| | - Bas W Ibelings
- Department F.-A. Forel for Aquatic and Environmental Sciences and Institute for Environmental Sciences, University of Geneva, Geneva, 1290, Switzerland
| | - Matthew J Prentice
- Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia
| | - Elena F Galvanese
- Laboratório de Análise e Síntese em Biodiversidade, Departamento de Botânica, Setor de Ciências Biológicas, Universidade Federal do Paraná, Curitiba-PR, 81531-998, Brazil
- Programa de Pós-graduação em Ecologia e Conservação, Setor de Ciências Biológicas, Universidade Federal do Paraná, Curitiba-PR, 80060-140, Brazil
| | - Ted D Harris
- Kansas Biological Survey and Center for Ecological Research, Lawrence, KS, 66047, United States
| | - David P Hamilton
- Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia
| |
Collapse
|
3
|
Zhang X, Tong C, Taylor WD, Rudstam LG, Jeppesen E, Bolotov I, Bespalaya YV, Razlutskij V, Mei X, Liu Z. Does differential phosphorus processing by plankton influence the ecological state of shallow lakes? THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 769:144357. [PMID: 33477050 DOI: 10.1016/j.scitotenv.2020.144357] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 11/23/2020] [Accepted: 12/05/2020] [Indexed: 06/12/2023]
Abstract
Shallow lakes have a tendency to settle into turbid or clear-water states, the latter having lower concentrations of total phosphorus (TP). However, how P-cycling is affected by and perhaps contributes to maintaining the different states is not well understood, in part because quantifying the processes involved by traditional methods is difficult. To elucidate these processes, we conducted experiments using 32P-PO4 as a tracer on samples collected from the unrestored, unvegetated sections of Huizhou West Lake where turbid water prevails as well as the restored, clear-water, macrophyte-rich waters of the lake. We measured PO4 uptake rates, 32P-PO4 accumulation by various plankton size-fractions (picoplankton (0.2-2 μm), nanoplankton (2-20 μm) and microplankton (>20 μm)) as well as release rates of 32P-PO4 by labelled plankton. Our results revealed slow PO4 uptake in the turbid state due to low PO4 concentration, slow recycling of the high particulate P, and high levels of particulate 32P which may allow for continuous high growth and biomass of phytoplankton. In contrast, in the clear water state, the uptake of PO4 was rapid due to a higher PO4 concentration, the recycling rates of particulate 32P were high and the levels of particulate 32P were low, potentially constraining the phytoplankton growth. A greater proportion of particulate 32P was in the microplankton fraction in clear waters, suggesting that grazing by microplankton may play an important role in the rapid P recycling in clear-waters. Our results provide some evidence for a reinforcement of the turbid conditions (low recycling rate) when the lake is in a turbid state and vice versa when in the clear water state. The results add new knowledge to the understanding of P cycling in shallow lakes and illustrate the utility of using P-kinetics in contrasting states in plankton communities.
Collapse
Affiliation(s)
- Xiufeng Zhang
- Department of Ecology and Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
| | - Chunfu Tong
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
| | - William D Taylor
- Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Lars G Rudstam
- Cornell Biological Field Station, Department of Natural Resources, Cornell University, New York, USA
| | - Erik Jeppesen
- Department of Bioscience, Aarhus University, DK-8600 Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), Beijing, China; Limnology Laboratory, Department of Biological Sciences and Centre for Ecosystem Research and Implementation, Middle East Technical University, Ankara, Turkey
| | - Ivan Bolotov
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of Russian Academy of Sciences, Russia
| | - Yulia V Bespalaya
- N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of Russian Academy of Sciences, Russia
| | - Vladimir Razlutskij
- State Scientific and Production Amalgamation Scientific-practical center of the National Academy of Sciences of Belarus for Biological Resources, Minsk, Belarus
| | - Xueying Mei
- College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
| | - Zhengwen Liu
- Department of Ecology and Institute of Hydrobiology, Jinan University, Guangzhou 510632, China; Sino-Danish Centre for Education and Research (SDC), Beijing, China; State Key Laboratory of Lake Science and Environment, Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
| |
Collapse
|
4
|
Aubriot L. Nitrogen availability facilitates phosphorus acquisition by bloom-forming cyanobacteria. FEMS Microbiol Ecol 2019; 95:5195515. [PMID: 30476121 DOI: 10.1093/femsec/fiy229] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/20/2018] [Indexed: 11/13/2022] Open
Abstract
Cyanobacterial blooms are threatening freshwater ecosystems. The physiological basis involved in the onset of cyanobacterial bloom is fundamental to advance in bloom predictions. Generally, cyanobacteria grow until the availability of nitrogen (N), phosphorus (P) or both nutrients becomes limited. Population survival may depend on physiological adjustments to nutrient deficiency as well as on the efficient use of episodic N and P inputs. This study investigated the effect of N inputs on phosphate uptake affinity and activity of N-deficient bloom-forming cyanobacteria. Lake samples dominated by filamentous cyanobacteria were preincubated with and without nitrate addition, and the uptake of [32P] phosphate pulses was measured in the following days. Phosphate uptake kinetics were analyzed with a flow-force model that provides the threshold concentration, reflecting phosphate uptake affinity, and the membrane conductivity coefficient that corresponds to the activity of uptake systems. After 24 h of nitrate preincubation, phosphate uptake kinetics showed a progressive increase in affinity (nanomolar [Pe]A) and activity (25-fold) concomitant with cyanobacterial growth. It was demonstrated that the alleviation of N-deficiency by N inputs boosts the activation of phosphate uptake systems of non-N2-fixing cyanobacteria to sustain growth. Therefore, reduction of dissolved inorganic N levels in lakes is also mandatory to limit cyanobacterial phosphate uptake affinity and activity capabilities.
Collapse
Affiliation(s)
- Luis Aubriot
- Grupo de Ecología y Fisiología de Fitoplancton, Sección Limnología, Instituto de Ecología y Ciencias Ambientales, Facultad de Ciencias, UdelaR
| |
Collapse
|
5
|
Voronkov A, Sinetova M. Polyphosphate accumulation dynamics in a population of Synechocystis sp. PCC 6803 cells under phosphate overplus. PROTOPLASMA 2019; 256:1153-1164. [PMID: 30972564 DOI: 10.1007/s00709-019-01374-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 03/28/2019] [Indexed: 06/09/2023]
Abstract
In this study, a simple and rapid DAPI-based protocol was developed and optimized to visualize polyphosphates (polyPs) in the cyanobacterium Synechocystis sp. PCC 6803. The optimum dye concentration and incubation time were determined, and formaldehyde fixation was shown to significantly improve polyP detection in Synechocystis cells. Using the developed protocol, for the first time, it was shown that 80% of Synechocystis cells under phosphate overplus were able to accumulate phosphorus as polyP 3 min after the addition of K2HPO4. After 1 h, the number of cells with polyP began to decrease, and after 24 h, polyP granules were detected in only 30% of the cells. Thus, the Synechocystis cells appeared to be heterogeneous in their ability to accumulate and mobilize polyP. Like other photosynthetic organisms, Synechocystis synthesized less polyP in the dark than in the light. The accumulation of polyP was not inhibited under conditions of cold and heat stresses, and some cells were even able to synthesize polyP at a temperature of approximately 0 °C.
Collapse
Affiliation(s)
- Alexander Voronkov
- K.A. Timiryazev Institute of Plant Physiology RAS, Botanicheskaya str., 35, Moscow, 127276, Russia
| | - Maria Sinetova
- K.A. Timiryazev Institute of Plant Physiology RAS, Botanicheskaya str., 35, Moscow, 127276, Russia.
| |
Collapse
|
6
|
Falkner R, Falkner UDDG. Phosphate Uptake by Eukaryotic Algae in Cultures and by a Mixed Phytoplankton Population in a Lake: Analysis by a Force-Flow Relationship*. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1989.tb00106.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
7
|
Aubriot L, Bonilla S, Falkner G. Adaptive phosphate uptake behaviour of phytoplankton to environmental phosphate fluctuations. FEMS Microbiol Ecol 2011; 77:1-16. [DOI: 10.1111/j.1574-6941.2011.01078.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
8
|
REYNOLDS CS, DAVIES PS. Sources and bioavailability of phosphorus fractions in freshwaters: a British perspective. Biol Rev Camb Philos Soc 2007. [DOI: 10.1111/j.1469-185x.2000.tb00058.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
9
|
Falkner R, Priewasser M, Falkner G. Information Processing by Cyanobacteria during Adaptation to Environmental Phosphate Fluctuations. PLANT SIGNALING & BEHAVIOR 2006; 1:212-220. [PMID: 19521487 PMCID: PMC2634028 DOI: 10.4161/psb.1.4.3242] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2006] [Accepted: 07/26/2006] [Indexed: 05/27/2023]
Abstract
Phosphate limited grown Anabaena variabilis has the capability of processing information about external phosphate fluctuations by means of interconnected adaptive events. Adaptive events are physiological processes that are characterized by two opposite manifestations, namely adapted states and adaptive operation modes. In adapted states the energy-converting constituents of the uptake system operate under the prevailing external conditions in a coherent manner with least energy dissipation. Adaptive operation modes take place when adapted states are disturbed by persistent changes in phosphate supply. In this mode the outcome of former adaptations to elevated phosphate levels guides the emergence of a new adapted state. The influence of antecedent adapted states on subsequent adaptations was studied experimentally and characteristic examples for such information processing are given. The theory of self-referential systems allowed analyzing these examples. For this purpose adaptive events had to be considered as elements of a communicating network, in which, along a historic succession of alternating adapted states and adaptive operation modes, information pertaining to the self-preservation of the organism is transferred from one adaptive event to the next: the latter "interprets" environmental changes by means of distinct adaptive operation modes, aimed at preservation of the organism. The result of this interpretation is again leading to a coherent state that is passed on to subsequent adaptive events. A generalization of this idea to the adaptive interplay of other energy converting subsystems of the cell leads to the dynamic view of cellular information processing in which the organism recreates itself in every new experience.
Collapse
Affiliation(s)
- Renate Falkner
- Institute of Limnology; Austrian Academy of Sciences; Mondsee, Austria
| | | | | |
Collapse
|
10
|
Plaetzer K, Thomas SR, Falkner R, Falkner G. The microbial experience of environmental phosphate fluctuations. An essay on the possibility of putting intentions into cell biochemistry. J Theor Biol 2005; 235:540-54. [PMID: 15935172 DOI: 10.1016/j.jtbi.2005.02.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2004] [Revised: 01/27/2005] [Accepted: 02/09/2005] [Indexed: 11/17/2022]
Abstract
We present a model of microbial information processing that contains characteristic features of the phenomenon of physiological adaptation. The backbone of the model is the "adaptive event" in which energy-converting subsystems of the cell interact with the changing environment. In this process, the subsystems pass, via an adaptive operation mode, from one adapted state to the next. An adaptive operation mode takes place when an adapted state is disturbed by an environmental alteration. These two manifestations of an adaptive event were differently treated in the simulation, based on an application of linear irreversible thermodynamics to the energy transduction of adaptive subsystems. In adapted states, the conductivity coefficients of the flow-force relationships employed remained constant, whereas during an adaptive operation mode, these coefficients were altered in a directional manner during the simulation. An example dealing with the complex relationship between phosphate uptake and cyanobacterial growth is given. In this example, the simulation of adapted states of two subsystems of the incorporating machinery, namely the phosphate carrier in the cell membrane and the F-ATPase in the thylakoid membrane, was in accordance with the measured uptake kinetics, and when fixed, predetermined conductivity coefficients were used. In the adaptive operation mode, however, the simulated behavior was in agreement with experimental observations when the program was able to "interpret" its own performance in the light of environmental phosphate fluctuations, experienced by the cell in the past, and to reconstruct the two subsystems according to this interpretation. Via transitions between adapted states and adaptive modes, information is transferred from one adaptive event to the next: the latter "inherits" the results of former interpretations. By appropriating them selectively, it is entering into a future in which its own interpretation is passed on to the following adaptive event. The model is discussed with respect to the concept of autopoiesis.
Collapse
Affiliation(s)
- Kristjan Plaetzer
- Institute of Physics and Biophysics, University of Salzburg, Hellbrunnerstr. 34, 5020 Salzburg, Austria.
| | | | | | | |
Collapse
|
11
|
Falkner R, Falkner G. Distinct Adaptivity During Phosphate Uptake by the CyanobacteriumAnabaena variabilisReflects Information Processing About Preceding Phosphate Supply. ACTA ACUST UNITED AC 2003. [DOI: 10.1081/tma-120020271] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
12
|
The bioenergetic coordination of a complex biological system is revealed by its adaptation to changing environmental conditions. Acta Biotheor 1996. [DOI: 10.1007/bf00046534] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
13
|
Isolation and functional reconstitution of a phosphate binding protein of the cyanobacterium Anacystis nidulans induced during phosphate-limited growth. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)37489-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|