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Duan H, Zhang L, Wang H, Li S, Li X, Zhuang Y. Enhancing nitrate removal from small wetlands via regulating bacterial-algal symbiosis with macrophyte coverage. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 951:175745. [PMID: 39182778 DOI: 10.1016/j.scitotenv.2024.175745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2024] [Revised: 08/06/2024] [Accepted: 08/22/2024] [Indexed: 08/27/2024]
Abstract
With increasing land resource constraints, wetlands, as ecological hotspots, are expected to enhance biogeochemical processes to mitigate nitrogen (N) pollution, particularly nitrate-nitrogen (NO3--N). However, the interactions among bacteria, algae, and macrophytes in wetlands, which are crucial for N removal, remain largely unknown. This study explored how macrophyte coverage influences bacterial-algal interactions, shifting from mutualism to inhibition, thereby affecting N removal. Moderate coverage enhanced NO3--N and total nitrogen (TN) removal (P < 0.05), which was correlated with increased microbial abundance (P < 0.05). This may have resulted from moderate algal photosynthesis, reduced physiological stress, and the expansion of ecological niches for microbes. Insufficient coverage promoted algal growth (chlorophyll-a > 31.8 μg·L-1), leading to increased competition for substrates and elevated pH, which further inhibited bacterial activity. Excessive coverage also inhibited bacterial activity by reducing illumination and oxidation-reduction potential. Consequently, insufficient and excessive coverage decreased N removal efficiencies by 2.7-15.7 % (NO3--N) and 3.7-11.1 % (TN) while increasing methane emission potential by 1.4-6.9 times compared with moderate coverage. These findings offer insights into solving NO3--N contamination using near-natural methods and balancing the ecological and practical considerations for small wetlands.
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Affiliation(s)
- He Duan
- Key Laboratory for Environment and Disaster Monitoring and Evaluation of Hubei, Jianghan Plain-Honghu Lake Station for Wetland Ecosystem Research, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Liang Zhang
- Key Laboratory for Environment and Disaster Monitoring and Evaluation of Hubei, Jianghan Plain-Honghu Lake Station for Wetland Ecosystem Research, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Haodong Wang
- Key Laboratory for Environment and Disaster Monitoring and Evaluation of Hubei, Jianghan Plain-Honghu Lake Station for Wetland Ecosystem Research, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan 430078, China.
| | - Sisi Li
- Key Laboratory for Environment and Disaster Monitoring and Evaluation of Hubei, Jianghan Plain-Honghu Lake Station for Wetland Ecosystem Research, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Xudong Li
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Yanhua Zhuang
- Key Laboratory for Environment and Disaster Monitoring and Evaluation of Hubei, Jianghan Plain-Honghu Lake Station for Wetland Ecosystem Research, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Heitzman BS, Bueno GW, Camargo TR, Proença DC, Yaekashi CTO, da Silva RMG, Machado LP. Duckweed application in nature-based system for water phytoremediation and high-value coproducts at family agrisystem from a circular economy perspective. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 919:170714. [PMID: 38331276 DOI: 10.1016/j.scitotenv.2024.170714] [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: 09/29/2023] [Revised: 02/02/2024] [Accepted: 02/03/2024] [Indexed: 02/10/2024]
Abstract
Duckweeds are widely recognized for their efficiency in the phytoremediation of agricultural and industrial effluents. This study had two main objectives: 1) Implement a Nature-based Solutions (NBS) utilizing the environmental services of duckweeds to improve water quality through phytoremediation in small fish farms; 2) Analysis of duckweeds biomass produced in these fish farms to develop coproducts from a circular economy perspective in family agrisystem in Brazilian Atlantic Forest. The effectiveness of the phytoremediation system was assessed by the reduction of the Trophic State Index (TSI). Phytoremediation in small fish farming NBS was implemented using Clarias gariepinus, employing two different managements approaches: (i) System I - L. minor cultured every 15 days, with biomass harvest and effluent analysis conducted in each cycle over 60 days; (ii) System II - L. minor cultured every 30 days, following a similar cycle and analysis. Additionally, effluent from fish production underwent testing for phytoremediation in a batch system within a climate-controlled laboratory. L. minor demonstrated efficiency in System II, leading to a reduction of the TSI. The dry biomass of the plants emerged as a viable source of amino acid for application in functional foods and feed or nutraceuticals. The findings underscore the potential integration of L. minor into the NBS system and the generation of new co-products from circular production. In addition to its effective phyto- remediation properties, L. minor's dry biomass exhibited appealing characteristics, with elevated levels of crude protein, minerals, fatty acids, and carotenoids. This positions L. minor as a promising candidate for developing bioproducts tailored for functional foods and nutraceuticals. This underscores the potential of duckweeds to produce valuable nutritional compounds beyond their remediation capabilities.
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Affiliation(s)
- Beatriz S Heitzman
- Department of Fishery Engineering, São Paulo State University (UNESP), Campus of Registro, Registro, SP, Brazil
| | - Guilherme W Bueno
- Department of Fishery Engineering, São Paulo State University (UNESP), Campus of Registro, Registro, SP, Brazil; Aquaculture Center, São Paulo State University (UNESP), Campus Jaboticabal, Jaboticabal, SP, Brazil
| | - Tavani R Camargo
- Aquaculture Center, São Paulo State University (UNESP), Campus Jaboticabal, Jaboticabal, SP, Brazil
| | - Danilo C Proença
- Aquaculture Center, São Paulo State University (UNESP), Campus Jaboticabal, Jaboticabal, SP, Brazil
| | - Carlos T O Yaekashi
- Engineering of Biomaterials and Bioprocess group São Paulo State University (UNESP), Institute of Pharmacy, Araraquara, São Paulo, Brazil
| | - Regildo M G da Silva
- São Paulo State University (UNESP), School of Sciences, Humanities, and Languages, Department of Biotechnology, Laboratory of Phytotherapic and Natural Products, Assis, São Paulo, Brazil
| | - Levi P Machado
- Department of Fishery Engineering, São Paulo State University (UNESP), Campus of Registro, Registro, SP, Brazil; Engineering of Biomaterials and Bioprocess group São Paulo State University (UNESP), Institute of Pharmacy, Araraquara, São Paulo, Brazil.
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Oláh V, Appenroth KJ, Sree KS. Duckweed: Research Meets Applications. PLANTS (BASEL, SWITZERLAND) 2023; 12:3307. [PMID: 37765471 PMCID: PMC10535908 DOI: 10.3390/plants12183307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023]
Abstract
The Special Issue "Duckweed: Research Meets Applications" of the journal Plants (ISSN 2223-7747) presents a comprehensive update of the current progress in the field [...].
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Affiliation(s)
- Viktor Oláh
- Department of Botany, Institute of Biology and Ecology, Faculty of Science and Technology, University of Debrecen, 4032 Debrecen, Hungary
| | - Klaus-Juergen Appenroth
- Matthias Schleiden Institute–Plant Physiology, Friedrich Schiller University Jena, 07743 Jena, Germany
| | - K. Sowjanya Sree
- Department of Environmental Science, Central University of Kerala, Periye 671320, India
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Tran IT, Heiman JA, Lydy VR, Kissoon LT. Silver Inhibits Lemna minor Growth at High Initial Frond Densities. PLANTS (BASEL, SWITZERLAND) 2023; 12:1104. [PMID: 36903968 PMCID: PMC10004846 DOI: 10.3390/plants12051104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/11/2023] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Silver nanoparticles (AgNPs) are the most popular engineered nanomaterials in consumer products due to their antimicrobial properties. They enter aquatic ecosystems via insufficient purified wastewaters from manufacturers or consumers. AgNPs inhibit growth of aquatic plants, including duckweeds. Growth media nutrient concentration and initial duckweed frond density can affect growth. However, it is not well understood how frond density affects nanoparticle toxicity. We investigated the toxicity of 500 µg/L AgNPs and AgNO3 on Lemna minor at different initial frond densities (20, 40, and 80 fronds per 28.5 cm2) over 14 days. Plants were more sensitive to silver at high initial frond densities. Growth rates based on frond number and area were lower for plants at 40 and 80 initial frond density in both silver treatments. AgNPs had no effect on frond number, biomass, and frond area at 20 initial frond density. However, AgNO3 plants had lower biomass than control and AgNP plants at 20 initial frond density. Competition and crowding at high frond densities resulted in reduced growth when silver was present, therefore plant density and crowding effects should be considered in toxicity studies.
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Affiliation(s)
- Indigo T. Tran
- Department of Biology, Missouri State University, Springfield, MO 65897, USA
| | - Jordan A. Heiman
- Department of Biology, The University of Mississippi, University, MS 38677, USA
| | - Victoria R. Lydy
- Department of Biological Sciences, Arkansas State University, Jonesboro, AR 72401, USA
| | - La Toya Kissoon
- Department of Biology, Missouri State University, Springfield, MO 65897, USA
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Zhou Y, Stepanenko A, Kishchenko O, Xu J, Borisjuk N. Duckweeds for Phytoremediation of Polluted Water. PLANTS (BASEL, SWITZERLAND) 2023; 12:589. [PMID: 36771672 PMCID: PMC9919746 DOI: 10.3390/plants12030589] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/28/2022] [Accepted: 01/19/2023] [Indexed: 06/18/2023]
Abstract
Tiny aquatic plants from the Lemnaceae family, commonly known as duckweeds, are often regarded as detrimental to the environment because of their ability to quickly populate and cover the surfaces of bodies of water. Due to their rapid vegetative propagation, duckweeds have one of the fastest growth rates among flowering plants and can accumulate large amounts of biomass in relatively short time periods. Due to the high yield of valuable biomass and ease of harvest, duckweeds can be used as feedstock for biofuels, animal feed, and other applications. Thanks to their efficient absorption of nitrogen- and phosphate-containing pollutants, duckweeds play an important role in the restorative ecology of water reservoirs. Moreover, compared to other species, duckweed species and ecotypes demonstrate exceptionally high adaptivity to a variety of environmental factors; indeed, duckweeds remove and convert many contaminants, such as nitrogen, into plant biomass. The global distribution of duckweeds and their tolerance of ammonia, heavy metals, other pollutants, and stresses are the major factors highlighting their potential for use in purifying agricultural, municipal, and some industrial wastewater. In summary, duckweeds are a powerful tool for bioremediation that can reduce anthropogenic pollution in aquatic ecosystems and prevent water eutrophication in a simple, inexpensive ecologically friendly way. Here we review the potential for using duckweeds in phytoremediation of several major water pollutants: mineral nitrogen and phosphorus, various organic chemicals, and heavy metals.
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Affiliation(s)
- Yuzhen Zhou
- School of Life Science, Huaiyin Normal University, Huai’an 223300, China
| | - Anton Stepanenko
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), 06466 Gatersleben, Germany
- Institute of Cell Biology and Genetic Engineering, National Academy of Sciences of Ukraine, 03143 Kyiv, Ukraine
| | - Olena Kishchenko
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), 06466 Gatersleben, Germany
- Institute of Cell Biology and Genetic Engineering, National Academy of Sciences of Ukraine, 03143 Kyiv, Ukraine
| | - Jianming Xu
- School of Life Science, Huaiyin Normal University, Huai’an 223300, China
| | - Nikolai Borisjuk
- School of Life Science, Huaiyin Normal University, Huai’an 223300, China
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Oláh V, Irfan M, Szabó ZB, Sajtos Z, Ragyák ÁZ, Döncző B, Jansen MAK, Szabó S, Mészáros I. Species- and Metal-Specific Responses of the Ionome of Three Duckweed Species under Chromate and Nickel Treatments. PLANTS (BASEL, SWITZERLAND) 2023; 12:180. [PMID: 36616308 PMCID: PMC9824728 DOI: 10.3390/plants12010180] [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: 11/22/2022] [Revised: 12/25/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
In this study, growth and ionomic responses of three duckweed species were analyzed, namely Lemna minor, Landoltia punctata, and Spirodela polyrhiza, were exposed for short-term periods to hexavalent chromium or nickel under laboratory conditions. It was found that different duckweed species had distinct ionomic patterns that can change considerably due to metal treatments. The results also show that, because of the stress-induced increase in leaf mass-to-area ratio, the studied species showed different order of metal uptake efficiency if plant area was used as unit of reference instead of the traditional dry weight-based approach. Furthermore, this study revealed that μXRF is applicable in mapping elemental distributions in duckweed fronds. By using this method, we found that within-frond and within-colony compartmentation of metallic ions were strongly metal- and in part species-specific. Analysis of duckweed ionomics is a valuable approach in exploring factors that affect bioaccumulation of trace pollutants by these plants. Apart from remediating industrial effluents, this aspect will gain relevance in food and feed safety when duckweed biomass is produced for nutritional purposes.
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Affiliation(s)
- Viktor Oláh
- Department of Botany, Institute of Biology and Ecology, Faculty of Science and Technology, University of Debrecen, Egyetem Square 1, H-4032 Debrecen, Hungary
| | - Muhammad Irfan
- Department of Botany, Institute of Biology and Ecology, Faculty of Science and Technology, University of Debrecen, Egyetem Square 1, H-4032 Debrecen, Hungary
| | - Zsuzsanna Barnáné Szabó
- Department of Botany, Institute of Biology and Ecology, Faculty of Science and Technology, University of Debrecen, Egyetem Square 1, H-4032 Debrecen, Hungary
| | - Zsófi Sajtos
- Atomic Spectroscopy Partner Laboratory, Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem Square 1, H-4032 Debrecen, Hungary
| | - Ágota Zsófia Ragyák
- Atomic Spectroscopy Partner Laboratory, Department of Inorganic and Analytical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem Square 1, H-4032 Debrecen, Hungary
- Doctoral School of Chemistry, University of Debrecen, Egyetem Square 1, H-4032 Debrecen, Hungary
| | - Boglárka Döncző
- Institute for Nuclear Research (ATOMKI), Bem tér 18/c, H-4026 Debrecen, Hungary
| | - Marcel A. K. Jansen
- School of Biological, Earth and Environmental Science, University College Cork, Distillery Fields, North Mall, T23N73K Cork, Ireland
| | - Sándor Szabó
- Department of Biology, University of Nyiregyhaza, H-4401 Nyiregyhaza, Hungary
| | - Ilona Mészáros
- Department of Botany, Institute of Biology and Ecology, Faculty of Science and Technology, University of Debrecen, Egyetem Square 1, H-4032 Debrecen, Hungary
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Paolacci S, Stejskal V, Toner D, Jansen MAK. Integrated Multitrophic Aquaculture; Analysing Contributions of Different Biological Compartments to Nutrient Removal in a Duckweed-Based Water Remediation System. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11223103. [PMID: 36432832 PMCID: PMC9698553 DOI: 10.3390/plants11223103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/09/2022] [Accepted: 11/12/2022] [Indexed: 06/12/2023]
Abstract
Duckweed (Lemnaceae) can support the development of freshwater aquaculture if used as extractive species in Integrated MultiTrophic Aquaculture (IMTA) systems. These aquatic plants have the advantage of producing protein-rich biomass that has several potential uses. On the contrary, other biological compartments, such as microalgae and bacteria, present in the water and competing with duckweed for light and nutrients cannot be harvested easily from the water. Moreover, as phytoplankton cannot easily be harvested, nutrients are eventually re-released; hence, this compartment does not contribute to the overall water remediation process. In the present study, a mesocosm experiment was designed to quantify the portion of nutrients effectively removed by duckweed in a duckweed-based aquaculture wastewater remediation system. Three tanks were buried next to a pilot-scale IMTA system used for the production of rainbow trout and perch. The tanks received aquaculture effluents from the adjacent system, and 50% of their surface was covered by duckweed. Daily water analyses of samples at the inlet and outlet of the mesocosm allowed quantification of the amount of nutrients removed in total. The portion removed by duckweed was determined by examining the nutrient content in the initial and final biomass. The portion of nutrients removed by other compartments was similarly estimated. The results show that duckweed is responsible for the removal of 31% and 29% of N and P, respectively. Phytoplankton removed 33% and 38% of N and P, respectively, while the biofilm played no major role in nutrient removal. The remainder of the removed nutrients were probably assimilated by bacteria or sedimented. It is speculated that a higher initial duckweed density can limit phytoplankton growth and, therefore, increase the portion of nutrients removed by the duckweed compartment.
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Affiliation(s)
- Simona Paolacci
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 N73K Cork, Ireland
| | - Vlastimil Stejskal
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 N73K Cork, Ireland
- Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Institute of Aquaculture, University of South Bohemia in Ceske Budejovice, Husova Tř. 458/102, 370 05 České Budějovice, Czech Republic
| | - Damien Toner
- BIM, Ireland’s Seafood Development Agency, Crofton Rd, Dun Laoghaire, A96 E5A0 Co. Dublin, Ireland
| | - Marcel A. K. Jansen
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 N73K Cork, Ireland
- Environmental Research Institute, Lee Road, T23 N73K Cork, Ireland
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Coughlan NE, Walsh É, Ahern R, Burnell G, O’Mahoney R, Kuehnhold H, Jansen MAK. Flow Rate and Water Depth Alters Biomass Production and Phytoremediation Capacity of Lemna minor. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11162170. [PMID: 36015473 PMCID: PMC9416032 DOI: 10.3390/plants11162170] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 08/14/2022] [Accepted: 08/19/2022] [Indexed: 05/31/2023]
Abstract
Given its high biomass production, phytoremediation capacity and suitability as a feedstock for animal and human nutrition, duckweeds are valuable multipurpose plants that can underpin circular economy applications. In recent years, the use of duckweeds to mitigate environmental pollution and valorise wastewaters through the removal of excess nitrogen and phosphate from wastewaters has gained considerable scientific attention. However, quantitative data on optimisation of duckweed performance in phytoremediation systems remain scant. In particular, a mechanistical understanding of how physical flows affect duckweed growth and remediation capacity within vertical indoor multi-tiered bioreactors is unknown. Here, effects of flow rate (0.5, 1.5 or 3.0 L min-1) and medium depth (25 mm or 50 mm) on Lemna minor biomass production and phytoremediation capacity were investigated. Results show that flow rates and water depths significantly affect both parameters. L. minor grew best at 1.5 L min-1 maintained at 50 mm, corresponding to a flow velocity of 0.0012 m s-1. The data are interpreted to mean that flow velocities should be low enough not to physically disturb duckweed but still allow for adequate nutrient mixing. The data presented will considerably advance the optimisation of large-scale indoor (multi-tiered, stacked), as well as outdoor (pond, lagoon, canal), duckweed-based remediation of high nutrient wastewaters.
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Affiliation(s)
- Neil E. Coughlan
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 TK30 Cork, Ireland
- Environmental Research Institute, University College Cork, T23 XE10 Cork, Ireland
| | - Éamonn Walsh
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 TK30 Cork, Ireland
- Environmental Research Institute, University College Cork, T23 XE10 Cork, Ireland
| | - Roger Ahern
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 TK30 Cork, Ireland
- Environmental Research Institute, University College Cork, T23 XE10 Cork, Ireland
| | - Gavin Burnell
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 TK30 Cork, Ireland
- Environmental Research Institute, University College Cork, T23 XE10 Cork, Ireland
| | - Rachel O’Mahoney
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 TK30 Cork, Ireland
- Environmental Research Institute, University College Cork, T23 XE10 Cork, Ireland
| | - Holger Kuehnhold
- Department of Ecology, Leibniz Centre for Tropical Marine Research (ZMT), 28359 Bremen, Germany
| | - Marcel A. K. Jansen
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Fields, North Mall, T23 TK30 Cork, Ireland
- Environmental Research Institute, University College Cork, T23 XE10 Cork, Ireland
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Particularities of Fungicides and Factors Affecting Their Fate and Removal Efficacy: A Review. SUSTAINABILITY 2022. [DOI: 10.3390/su14074056] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Systemic fungicide use has increased over the last decades, despite the susceptibility of resistance development and the side effects to human health and the environment. Although herbicides and insecticides are detected more frequently in environmental samples, there are many fungicides that have the ability to enter water bodies due to their physicochemical properties and their increasing use. Key factors affecting fungicide fate in the environment have been discussed, including the non-target effects of fungicides. For instance, fungicides are associated with the steep decline in bumblebee populations. Secondary actions of certain fungicides on plants have also been reported recently. In addition, the use of alternative eco-friendly disease management approaches has been described. Constructed Wetlands (CWs) comprise an environmentally friendly, low cost, and efficient fungicide remediation technique. Fungicide removal within CWs is dependent on plant uptake and metabolism, absorption in porous media and soil, hydrolysis, photodegradation, and biodegradation. Factors related to the efficacy of CWs on the removal of fungicides, such as the type of CW, plant species, and the physicochemical parameters of fungicides, are also discussed in this paper. There are low-environmental-risk fungicides, phytohormones and other compounds, which could improve the removal performance of CW vegetation. In addition, specific parameters such as the multiple modes of action of fungicides, side effects on substrate microbial communities and endophytes, and plant physiological response were also studied. Prospects and challenges for future research are suggested under the prism of reducing the risk related to fungicides and enhancing CW performance.
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Oláh V, Hepp A, Irfan M, Mészáros I. Chlorophyll Fluorescence Imaging-Based Duckweed Phenotyping to Assess Acute Phytotoxic Effects. PLANTS (BASEL, SWITZERLAND) 2021; 10:2763. [PMID: 34961232 PMCID: PMC8707530 DOI: 10.3390/plants10122763] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 12/02/2021] [Accepted: 12/09/2021] [Indexed: 06/12/2023]
Abstract
Duckweeds (Lemnaceae species) are extensively used models in ecotoxicology, and chlorophyll fluorescence imaging offers a sensitive and high throughput platform for phytotoxicity assays with these tiny plants. However, the vast number of potentially applicable chlorophyll fluorescence-based test endpoints makes comparison and generalization of results hard among different studies. The present study aimed to jointly measure and compare the sensitivity of various chlorophyll fluorescence parameters in Spirodela polyrhiza (giant duckweed) plants exposed to nickel, chromate (hexavalent chromium) and sodium chloride for 72 h, respectively. The photochemistry of Photosystem II in both dark- and light-adapted states of plants was assessed via in vivo chlorophyll fluorescence imaging method. Our results indicated that the studied parameters responded with very divergent sensitivity, highlighting the importance of parallelly assessing several chlorophyll fluorescence parameters. Generally, the light-adapted parameters were more sensitive than the dark-adapted ones. Thus, the former ones might be the preferred endpoints in phytotoxicity assays. Fv/Fm, i.e., the most extensively reported parameter literature-wise, proved to be the least sensitive endpoint; therefore, future studies might also consider reporting Fv/Fo, as its more responsive analogue. The tested toxicants induced different trends in the basic chlorophyll fluorescence parameters and, at least partly, in relative proportions of different quenching processes, suggesting that a basic distinction of water pollutants with different modes of action might be achievable by this method. We found definite hormetic patterns in responses to several endpoints. Hormesis occurred in the concentration ranges where the applied toxicants resulted in strong growth inhibition in longer-term exposures of the same duckweed clone in previous studies. These findings indicate that changes in the photochemical efficiency of plants do not necessarily go hand in hand with growth responses, and care should be taken when one exclusively interprets chlorophyll fluorescence-based endpoints as general proxies for phytotoxic effects.
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Affiliation(s)
- Viktor Oláh
- Department of Botany, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary; (A.H.); (M.I.); (I.M.)
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