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Tahjib-Ul-Arif M, Sohag AAM, Mostofa MG, Polash MAS, Mahamud AGMSU, Afrin S, Hossain MA, Hossain MA, Murata Y, Tran LSP. Comparative effects of ascobin and glutathione on copper homeostasis and oxidative stress metabolism in mitigation of copper toxicity in rice. Plant Biol (Stuttg) 2021; 23 Suppl 1:162-169. [PMID: 33236382 DOI: 10.1111/plb.13222] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 11/18/2020] [Indexed: 05/25/2023]
Abstract
Copper (Cu) pollution of agricultural land is a major threat to crop production. Exogenous chemical treatment is an easily accessible and rapid approach to remediate metal toxicity, including Cu toxicity in plants. We compared the effects of ascobin (ASC; ascorbic acid:citric acid at 2:1) and glutathione (GSH) in mitigation of Cu toxicity in rice. Plants subjected to Cu stress displayed growth inhibition and biomass reduction, which were connected to reduced levels of chlorophylls, RWC, total phenolic compounds, carotenoids and Mg2+ . Increased accumulation of ROS and malondialdehyde indicated oxidative stress in Cu-stressed plants. However, application of ASC or GSH minimized the inhibitory effects of Cu stress on rice plants by restricting Cu2+ uptake and improving mineral balance, chlorophyll content and RWC. Both ASC and GSH pretreatments reduced levels of ROS and malondialdehyde and improved activities of antioxidant enzymes, suggesting their roles in alleviating oxidative damage. A comparison on the effects of ASC and GSH under Cu stress revealed that ASC was more effective in restricting Cu2+ accumulation (69.5% by ASC and 57.1% by GSH), Ca2+ and Mg2+ homeostasis, protection of photosynthetic pigments and activation of antioxidant defence mechanisms [catalase (110.4%), ascorbate peroxidase (76.5%) and guaiacol peroxidase (39.0%) by ASC, and catalase (58.9%) and ascorbate peroxidase (59.9%) by GSH] in rice than GSH, eventually resulting in better protection of ASC-pretreated plants against Cu stress. In conclusion, although ASC and GSH differed in induction of stress protective mechanisms, both were effective in improving rice performance in response to Cu phytotoxicity.
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Affiliation(s)
- M Tahjib-Ul-Arif
- Department of Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
- Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama, 700-8530, Japan
| | - A A M Sohag
- Department of Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - M G Mostofa
- Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
| | - M A S Polash
- Department of Crop Botany, Khulna Agricultural University, Khulna, 9202, Bangladesh
| | - A G M S U Mahamud
- School of Food Science and Engineering, South China University of Technology, Guangzhou, 510641, China
| | - S Afrin
- Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama, 700-8530, Japan
| | - M A Hossain
- Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - M A Hossain
- Department of Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh
| | - Y Murata
- Graduate School of Environmental and Life Science, Okayama University, Kita-ku, Okayama, 700-8530, Japan
| | - L-S P Tran
- Institute of Research and Development, Duy Tan University, Da Nang, 550000, Vietnam
- Stress Adaptation Research Unit, RIKEN Center for Sustainable Resource Science, Yokohama, 230-0045, Japan
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