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Elshoky HA, Yotsova E, Farghali MA, Farroh KY, El-Sayed K, Elzorkany HE, Rashkov G, Dobrikova A, Borisova P, Stefanov M, Ali MA, Apostolova E. Impact of foliar spray of zinc oxide nanoparticles on the photosynthesis of Pisum sativum L. under salt stress. Plant Physiol Biochem 2021; 167:607-618. [PMID: 34464827 DOI: 10.1016/j.plaphy.2021.08.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [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: 01/31/2021] [Revised: 08/08/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
This study investigates the impacts of zinc oxide nanoparticles: bare (ZnO NPs) and ZnO NPs coated with silicon shell (ZnO-Si NPs), on Pisum sativum L. under physiological and salt stress conditions. The experimental results revealed that the foliar spray with ZnO-Si NPs and 200 mg/L ZnO NPs did not influence the stomata structure, the membrane integrity, and the functions of both photosystems under physiological conditions, while 400 mg/L ZnO-Si NPs had beneficial effects on the effective quantum yield of photosystem II (PSII) and the photochemistry of photosystem I (PSI). On the contrary, small phytotoxic effects were registered after spraying with 400 mg/L ZnO NPs accompanied by stimulation of the cyclic electron flow around PSI and an increase of the non-photochemical quenching (NPQ). The results also showed that both types of NPs (with exception of 400 mg/L ZnO NPs) decrease the negative effects of 100 mM NaCl on the photochemistry of PSI (P700 photooxidation) and PSII (qp, Fv/Fm, Fv/Fo, ΦPSII, Φexc), as well as on the pigment content, stomata closure and membrane integrity. The protective effect was stronger after spraying with ZnO-Si NPs in comparison to ZnO NPs, which could be due to the presence of Si coating shell. The role of Si shell is discussed.
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Affiliation(s)
- Hisham A Elshoky
- Nanotechnology and Advanced Materials Central Lab, Agricultural Research Center, Giza, Egypt; Regional Center for Food and Feed, Agricultural Research Center, Giza, Egypt
| | - Ekaterina Yotsova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Mohamed A Farghali
- Nanotechnology and Advanced Materials Central Lab, Agricultural Research Center, Giza, Egypt; Nanotechnology Research Center, British University in Egypt, Egypt
| | - Khaled Y Farroh
- Nanotechnology and Advanced Materials Central Lab, Agricultural Research Center, Giza, Egypt; Regional Center for Food and Feed, Agricultural Research Center, Giza, Egypt
| | - Kh El-Sayed
- Nanotechnology and Advanced Materials Central Lab, Agricultural Research Center, Giza, Egypt; Nanotechnology Research Center, British University in Egypt, Egypt
| | - Heba Elsayed Elzorkany
- Nanotechnology and Advanced Materials Central Lab, Agricultural Research Center, Giza, Egypt; Regional Center for Food and Feed, Agricultural Research Center, Giza, Egypt
| | - George Rashkov
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Anelia Dobrikova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Preslava Borisova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Martin Stefanov
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Maha Anwar Ali
- Biophysics Department, Faculty of Sciences, Cairo University, Giza, Egypt
| | - Emilia Apostolova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria.
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