Volume 13, Issue 61 (vol. 13, no. 61 2024)
2024, 13(61): 1-8 |
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Mottaki Z, Habibi G, Gholipour A, Lohrasebi T. Performance of chlorophyll a fluorescence parameters in Dracocephalum kotschyi and Nepeta crassifolia plants growing at low and high altitudes. Plant Process and Function 2024; 13 (61) : 1
URL: http://jispp.iut.ac.ir/article-1-1971-en.html
URL: http://jispp.iut.ac.ir/article-1-1971-en.html
1- Department of Biology, Payame Noor University (PNU), PO BOX 19395-3697, Tehran, Iran
2- Department of Agricultural Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
2- Department of Agricultural Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
Abstract: (408 Views)
The main focus of the present study was to better understand the effects of altitudinal gradient factors on the photochemical processes as reflected in changes in fast chlorophyll a fluorescence kinetics and related biophysical parameters in low and high-elevation ecotypes of Dracocephalum kotschyi and Nepeta crassifolia (located in Mazandaran, adjacent Central Alborz mountain range, central-northern part of Iran). In both Dracocephalum kotschyi and Nepeta crassifolia, high-altitude plants exhibited higher fluorescence parameters as compared to low-altitude plants, which was coupled with higher levels of carotenoids, suggesting proper functioning of PSII. Increased photochemical activity in high-altitude plants was achieved by increased levels of the activity of the oxygen-evolving complex (Fv/Fo), the performance index (PIabs) and the quantum yield for electron transport (φEo). In addition, a clear increase in the relative amplitude of the IP (Fm) phase from the OJIP curve was observed in high-altitude plants as compared to low-altitude plants. These results indicated a significant variation in the performance of chlorophyll a fluorescence parameter, between low- and high-altitude plants, which is apparently due to eco-physiological differences in relation to their altitudinal distributions. Summarizing, high-altitude plants have developed a series of mechanisms with respect to photosynthetic apparatus efficiency to protect themselves from adverse environmental threats.
Article number: 1
Type of Study: Research |
Subject:
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Received: 2023/10/3 | Accepted: 2024/01/1 | Published: 2024/08/12
Received: 2023/10/3 | Accepted: 2024/01/1 | Published: 2024/08/12
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