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Zhang Y, Sun D, Gao W, Zhang X, Ye W, Zhang Z. The metabolic mechanisms of Cd-induced hormesis in photosynthetic microalgae, Chromochloris zofingiensis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168966. [PMID: 38043816 DOI: 10.1016/j.scitotenv.2023.168966] [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: 09/11/2023] [Revised: 11/22/2023] [Accepted: 11/26/2023] [Indexed: 12/05/2023]
Abstract
Cadmium, an environmental pollutant, is highly toxic and resistant to degradation. It exhibits toxicity at elevated doses but triggers excitatory effects at low doses, a phenomenon referred to as hormesis. Microalgae, as primary producers in aquatic ecosystems, demonstrate hormesis induced by cadmium, though the specific mechanisms are not yet fully understood. Consequently, we examined the hormesis of cadmium in Chromochloris zofingiensis. A minimal Cd2+ concentration (0.05 mg L-1) prompted cell proliferation, whereas higher concentrations (2.50 mg L-1) inhibited growth. The group exposed to higher doses exhibited increased levels of reactive oxygen species (ROS), malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD), and catalase (CAT). Contrastingly, the group exposed to low doses exhibited a moderate antioxidant response without significantly increasing ROS. This implies that increased levels of antioxidative components counteract excessive ROS, maintaining cellular redox balance and promoting growth under conditions of low Cd2+. Validation experiments have established that NADPH oxidase-derived ROS primarily coordinates the hormesis effect in microalgae. Comparative transcriptome analysis has proved the involvement of antioxidant systems and photosynthesis in regulating hormesis. Notably, Aurora A kinases consistently displayed varying expression levels across all Cd2+ treatments, and their role in microalgal hormesis was confirmed through validation with SNS-314 mesylate. This study unveils the intricate regulatory mechanisms of Cd-induced hormesis in C. zofingiensis, with implications for environmental remediation and industrial microalgae applications.
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Affiliation(s)
- Yushu Zhang
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation Center for Eco-Environment, Hebei Research Center of the Basic Discipline of Cell Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang 050024, China; Institute of Life Sciences and Green Development, Hebei University, Baoding 071000, China
| | - Dongzhe Sun
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation Center for Eco-Environment, Hebei Research Center of the Basic Discipline of Cell Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang 050024, China
| | - Weizheng Gao
- Institute of Life Sciences and Green Development, Hebei University, Baoding 071000, China
| | - Xinwei Zhang
- Institute of Life Sciences and Green Development, Hebei University, Baoding 071000, China
| | - Wenqi Ye
- Institute of Life Sciences and Green Development, Hebei University, Baoding 071000, China
| | - Zhao Zhang
- Ministry of Education Key Laboratory of Molecular and Cellular Biology, Hebei Collaborative Innovation Center for Eco-Environment, Hebei Research Center of the Basic Discipline of Cell Biology, College of Life Sciences, Hebei Normal University, Shijiazhuang 050024, China; Institute of Life Sciences and Green Development, Hebei University, Baoding 071000, China; Hebei Innovation Center for Bioengineering and Biotechnology, Baoding 071000, China.
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2
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Luo Y, Ding Y, Jiang X, Zeng G, Peng R, Han Q, Jiang M. Effects of low temperature and highlight stress on lipid accumulation and cell structure of Tropidoneis maxima. J Basic Microbiol 2023; 63:1139-1152. [PMID: 37339809 DOI: 10.1002/jobm.202300092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/25/2023] [Accepted: 06/02/2023] [Indexed: 06/22/2023]
Abstract
Tropidoneis maxima is a marine diatom with a rapid growth rate that produces high levels of lipids. To explore whether the lipid content could be further enhanced, cultures were first incubated under optimal conditions and then stressed under low temperature (10°C), a high light intensity level (80 μmol/m2 ·s), and the two factors together (interaction treatment). The results indicated that high light intensity and the temperature-light interaction exhibited greater impacts on lipid synthesis of T. maxima than low temperature. The two stress treatments increased lipid content by 17.16% and 16.6% compared to the control. In particular, higher biomass concentration was obtained with high light intensity (1.082 g L-1 ) and low temperature (1.026 g L-1 ). Moreover, high light intensity (9.06%) and interaction (10.3%) treatments yielded lower starch content compared to low temperature (14.27%) at the end of the stress culture. After 3 days of stress culture, the high light intensity treatment resulted in a 97.01% increase in cell wall thickness and an 18.46% decrease in cell diameter. The results suggest that high light intensity stress on T. maxima would open a new approach to cost-effective biolipid production.
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Affiliation(s)
- Yuanyuan Luo
- Key Laboratory of Applied Marine Biotechnology, School of Marine Sciences, Ningbo University, Ningbo, China
| | - Yuhui Ding
- Key Laboratory of Applied Marine Biotechnology, School of Marine Sciences, Ningbo University, Ningbo, China
| | - Xiamin Jiang
- Key Laboratory of Applied Marine Biotechnology, School of Marine Sciences, Ningbo University, Ningbo, China
| | - Guoquan Zeng
- Zhejiang Mariculture Research Institute, Wenzhou, China
| | - Ruibing Peng
- Key Laboratory of Applied Marine Biotechnology, School of Marine Sciences, Ningbo University, Ningbo, China
| | - Qingxi Han
- Key Laboratory of Applied Marine Biotechnology, School of Marine Sciences, Ningbo University, Ningbo, China
| | - Maowang Jiang
- Key Laboratory of Applied Marine Biotechnology, School of Marine Sciences, Ningbo University, Ningbo, China
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3
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Kinegawa R, Gala de Pablo J, Wang Y, Hiramatsu K, Goda K. Label-free multiphoton imaging flow cytometry. Cytometry A 2023. [PMID: 36799568 DOI: 10.1002/cyto.a.24723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 01/31/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023]
Abstract
Label-free imaging flow cytometry is a powerful tool for biological and medical research as it overcomes technical challenges in conventional fluorescence-based imaging flow cytometry that predominantly relies on fluorescent labeling. To date, two distinct types of label-free imaging flow cytometry have been developed, namely optofluidic time-stretch quantitative phase imaging flow cytometry and stimulated Raman scattering (SRS) imaging flow cytometry. Unfortunately, these two methods are incapable of probing some important molecules such as starch and collagen. Here, we present another type of label-free imaging flow cytometry, namely multiphoton imaging flow cytometry, for visualizing starch and collagen in live cells with high throughput. Our multiphoton imaging flow cytometer is based on nonlinear optical imaging whose image contrast is provided by two optical nonlinear effects: four-wave mixing (FWM) and second-harmonic generation (SHG). It is composed of a microfluidic chip with an acoustic focuser, a lab-made laser scanning SHG-FWM microscope, and a high-speed image acquisition circuit to simultaneously acquire FWM and SHG images of flowing cells. As a result, it acquires FWM and SHG images (100 × 100 pixels) with a spatial resolution of 500 nm and a field of view of 50 μm × 50 μm at a high event rate of four to five events per second, corresponding to a high throughput of 560-700 kb/s, where the event is defined by the passage of a cell or a cell-like particle. To show the utility of our multiphoton imaging flow cytometer, we used it to characterize Chromochloris zofingiensis (NIES-2175), a unicellular green alga that has recently attracted attention from the industrial sector for its ability to efficiently produce valuable materials for bioplastics, food, and biofuel. Our statistical image analysis found that starch was distributed at the center of the cells at the early cell cycle stage and became delocalized at the later stage. Multiphoton imaging flow cytometry is expected to be an effective tool for statistical high-content studies of biological functions and optimizing the evolution of highly productive cell strains.
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Affiliation(s)
- Ryo Kinegawa
- Department of Chemistry, The University of Tokyo, Tokyo, Japan
| | | | - Yi Wang
- Department of Chemistry, Renmin University of China, Beijing, China
| | - Kotaro Hiramatsu
- Department of Chemistry, The University of Tokyo, Tokyo, Japan.,Research Centre for Spectrochemistry, The University of Tokyo, Tokyo, Japan.,PRESTO, Japan Science and Technology Agency, Saitama, Japan
| | - Keisuke Goda
- Department of Chemistry, The University of Tokyo, Tokyo, Japan.,Institute of Technological Sciences, Wuhan University, Hubei, China.,Department of Bioengineering, University of California, Los Angeles, California, USA.,CYBO, Inc., Tokyo, Japan
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Gao W, Guan Y, Li Y, Zhang X, Fu Z, Zhang Z. Treatment of nitrogen and phosphorus in wastewater by heterotrophic N- and P-starved microalgal cell. Appl Microbiol Biotechnol 2023; 107:1477-1490. [PMID: 36692514 DOI: 10.1007/s00253-023-12380-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 11/18/2022] [Accepted: 01/10/2023] [Indexed: 01/25/2023]
Abstract
Nitrogen (N) and phosphorus (P) are two major pollutants present in aquaculture wastewater, and their concentrations often do not meet discharge standards. In the present study, the N and P removal efficiency of nutrient-deficient cells (S group) was significantly higher than that of photoautotrophic cells (P group) and heterotrophic cells (H group). After incubation with wastewater, the N and P content of S group cells was significantly increased and reached a level similar to that of the P group and H group cells after 6 days of treatment. Additionally, in the S group cells, the content of total fatty acids (TFAs), which can be used to supply energy and organic carbon for N and P absorption, significantly decreased. In addition, the protein and nucleic acid contents of the S group cells also significantly increased, which revealed the biosynthetic flow of assimilated N and P. Comparative transcriptome analysis showed that compared with the P group and H group, the N metabolism, ribosome, RNA polymerase, and fatty acid degradation pathways were significantly upregulated in the S group cells, and the fatty acid biosynthesis pathway was significantly downregulated, which was in agreement with the biochemical results. In summary, our study showed that N- and P-starved heterotrophic cells are ideal for use in wastewater N and P removal processes. Keypoints • The N and P removal efficiencies of the S group were higher than P and H groups • Fatty acids were degraded to supply energy and carbon for N and P absorption • N metabolism and fatty acid degradation pathways were upregulated in the S group.
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Affiliation(s)
- Weizheng Gao
- School of Life Sciences, Hebei University, Baoding, 071000, China
| | - Yueqiang Guan
- School of Life Sciences, Hebei University, Baoding, 071000, China.,Institute of Life Sciences and Green Development, Hebei University, Baoding, 071000, China
| | - Yiming Li
- School of Life Sciences, Hebei University, Baoding, 071000, China
| | - Xinwei Zhang
- School of Life Sciences, Hebei University, Baoding, 071000, China
| | - Zhongxiang Fu
- School of Life Sciences, Hebei University, Baoding, 071000, China
| | - Zhao Zhang
- School of Life Sciences, Hebei University, Baoding, 071000, China. .,Institute of Life Sciences and Green Development, Hebei University, Baoding, 071000, China. .,Key Laboratory of Microbial Diversity Research and Application of Hebei Province, Baoding, 071002, China.
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Han T, Han X, Ye X, Xi Y, Zhang Y, Guan H. Applying mixotrophy strategy to enhance biomass production and nutrient recovery of Chlorella pyrenoidosa from biogas slurry: An assessment of the mixotrophic synergistic effect. BIORESOURCE TECHNOLOGY 2022; 366:128185. [PMID: 36307028 DOI: 10.1016/j.biortech.2022.128185] [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: 09/01/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 06/16/2023]
Abstract
Using biogas slurry to cultivate microalgae can simultaneously obtain microalgal biomass and allow nutrient recovery. Mixotrophic microalgae are widely recognized for their high biomass accumulation and low light dependence, making it possible to overcome the drawbacks of photoautotrophy. In this study, three complete metabolic modes of photoautotrophy, heterotrophy, mixotrophy and two incomplete metabolic modes with the addition of diuron and rotenone were applied to investigate Chlorella pyrenoidosa growth in biogas slurry. The results showed that the mixotrophic group obtained 1.15 g/L biomass, 30 % starch content, 99.40 % ammonium removal and 81.69 % total phosphorus removal, which were highly promoted compared to the others. The decline in chlorophyll, the simultaneous downregulation of Rubisco and citrate synthase and the increase in the actual quantum yield of PSII under mixotrophy revealed a synergistic effect: the complementation of photophosphorylation and oxidative phosphorylation greatly contributed to maximizing energy metabolism efficiency and minimizing energy dissipation loss.
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Affiliation(s)
- Ting Han
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Key Laboratory of Crop and Livestock Integration, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
| | - Xiaotan Han
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210014, China
| | - Xiaomei Ye
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Key Laboratory of Crop and Livestock Integration, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China.
| | - Yonglan Xi
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Key Laboratory of Crop and Livestock Integration, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
| | - Yingpeng Zhang
- Institute of Animal Science, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Key Laboratory of Crop and Livestock Integration, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
| | - Huibo Guan
- School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
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Wood EE, Ross ME, Jubeau S, Montalescot V, Stanley MS. Progress towards a targeted biorefinery of Chromochloris zofingiensis: a review. BIOMASS CONVERSION AND BIOREFINERY 2022; 14:8127-8152. [PMID: 38510795 PMCID: PMC10948469 DOI: 10.1007/s13399-022-02955-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 06/09/2022] [Accepted: 06/13/2022] [Indexed: 03/22/2024]
Abstract
Biorefinery approaches offer the potential to improve the economics of the microalgae industry by producing multiple products from a single source of biomass. Chromochloris zofingiensis shows great promise for biorefinery due to high biomass productivity and a diverse range of products including secondary carotenoids, predominantly astaxanthin; lipids such as TAGs; carbohydrates including starch; and proteins and essential amino acids. Whilst this species has been demonstrated to accumulate multiple products, the development of an integrated downstream process to obtain these is lacking. The objective of this review paper is to assess the research that has taken place and to identify the steps that must be taken to establish a biorefinery approach for C. zofingiensis. In particular, the reasons why C. zofingiensis is a promising species to target for biorefinery are discussed in terms of cellular structure, potential products, and means to accumulate desirable components via the alteration of culture conditions. Future advances and the challenges that lie ahead for successful biorefinery of this species are also reviewed along with potential solutions to address them. Supplementary Information The online version contains supplementary material available at 10.1007/s13399-022-02955-7.
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Affiliation(s)
- Eleanor E. Wood
- University of the Highlands and Islands (UHI); Scottish Association for Marine Science (SAMS), Scottish Marine Institute, Oban, PA37 1QA UK
- Xanthella Ltd, Malin House, European Marine Science Park, Dunstaffnage, Argyll, Oban PA37 1SZ Scotland, UK
| | - Michael E. Ross
- University of the Highlands and Islands (UHI); Scottish Association for Marine Science (SAMS), Scottish Marine Institute, Oban, PA37 1QA UK
| | - Sébastien Jubeau
- Xanthella Ltd, Malin House, European Marine Science Park, Dunstaffnage, Argyll, Oban PA37 1SZ Scotland, UK
| | | | - Michele S. Stanley
- University of the Highlands and Islands (UHI); Scottish Association for Marine Science (SAMS), Scottish Marine Institute, Oban, PA37 1QA UK
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Transcriptomic and Physiological Responses of Chlorella pyrenoidosa during Exposure to 17α-Ethinylestradiol. Int J Mol Sci 2022; 23:ijms23073583. [PMID: 35408944 PMCID: PMC8999151 DOI: 10.3390/ijms23073583] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/21/2022] [Accepted: 03/22/2022] [Indexed: 11/16/2022] Open
Abstract
17α-ethinylestradiol (17α-EE2) is frequently detected in water bodies due to its use being widespread in the treatment of prostate and breast cancer and in the control of alopecia, posing a threat to humans and aquatic organisms. However, studies on its toxicity to Chlorella pyrenoidosa have been limited to date. This study investigated the effects of 17α-EE2 on the growth, photosynthetic activity, and antioxidant system of C. pyrenoidosa and revealed related molecular changes using transcriptomic analysis. The cell density of algae was inhibited in the presence of 17α-EE2, and cell morphology was also altered. Photosynthetics were damaged, while reactive oxygen species (ROS), superoxide dismutase (SOD), and malondialdehyde (MDA) content increased. Further transcriptomic analysis revealed that the pathways of photosynthesis and DNA replication were affected at three concentrations of 17α-EE2, but several specific pathways exhibited various behaviors at different concentrations. Significant changes in differentially expressed genes and their enrichment pathways showed that the low-concentration group was predominantly impaired in photosynthesis, while the higher-concentration groups were biased towards oxidative and DNA damage. This study provides a better understanding of the cellular and molecular variations of microalgae under 17α-EE2 exposure, contributing to the environmental risk assessment of such hazardous pollutants on aquatic organisms.
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Huy M, Kristin Vatland A, Kumar G. Nutraceutical productions from microalgal derived compounds via circular bioeconomy perspective. BIORESOURCE TECHNOLOGY 2022; 347:126575. [PMID: 34923082 DOI: 10.1016/j.biortech.2021.126575] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/10/2021] [Accepted: 12/11/2021] [Indexed: 06/14/2023]
Abstract
Circular bioeconomy has become a sustainable business model for commercial production that promises to reuse, recycle & recover while considering less environmental footprints in nutraceutical industries. Microalgae biotechnology has the synergy to bioremediate waste stream while generating high-value-added compounds such as astaxanthin, protein and polyunsaturated fatty acids that are potential compounds used in various industries, thus, the integration of this approach provides economic advantages. However, since the industrial production of these compounds is costly and affected byunstable climate in the Nordic regions such as low temperature, light intensity, and polar circle, the focus of biosynthesis has shifted from less tolerant commercial strains towards indigenous strains. Nutraceutical productions such as polyunsaturated fatty acids and protein can now be synthesized at low temperatures which significantly improve the industry's economy. In this review, the above-mentioned compounds with potential strains were discussed based on a Nordic region's perspective.
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Affiliation(s)
- Menghour Huy
- Department of Chemistry, Bioscience, and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Box 8600 Forus, 4036 Stavanger, Norway
| | - Ann Kristin Vatland
- Department of Chemistry, Bioscience, and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Box 8600 Forus, 4036 Stavanger, Norway
| | - Gopalakrishnan Kumar
- Department of Chemistry, Bioscience, and Environmental Engineering, Faculty of Science and Technology, University of Stavanger, Box 8600 Forus, 4036 Stavanger, Norway.
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Jiang Z, Sun Y, Guan H, Sun D, Fang S, Ma X, Wang Z, Li Z, Zhang C, Ge Y. Contributions of polysaccharides to arsenate resistance in Chlamydomonas reinhardtii. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 229:113091. [PMID: 34922168 DOI: 10.1016/j.ecoenv.2021.113091] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 12/10/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
Polysaccharides supply energy for various metabolic processes in cells. However, their roles in the arsenate (As(V)) resistance in microalgae remain largely unknown. Here, we explored the synthesis and transformation of polysaccharides in Chlamydomonas reinhardtii upon various levels of As(V) stress, using a number of physiological indexes along with transmission electron microscopic (TEM) and proteomic analyses. When exposed to low concentration of As(V) (0-20 μg/L), C. reinhardtii accumulated starch and produced more extracellular polysaccharides. At 50 μg/L As(V) treatment, starch accumulation gradually shifted to polysaccharides decomposition in the algal cells. Under higher As(V) concentration (500 μg/L), significantly more proteins in fatty acid metabolic pathway were differentially expressed, indicating that cells redirected carbon flux and transformed lipids into polysaccharides. The findings of this study demonstrate that polysaccharides may be critically involved in the As(V) resistance of C. reinhardtii.
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Affiliation(s)
- Zhongquan Jiang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Yutong Sun
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Huize Guan
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Danqing Sun
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Shu Fang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Xuening Ma
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Zhongyang Wang
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Zhen Li
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China; Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China
| | - Chunhua Zhang
- Demonstration Laboratory of Element and Life Science Research, Laboratory Centre of Life Science, College of Life Science, Nanjing Agricultural University, Nanjing 210095, China
| | - Ying Ge
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China.
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