Abstract
Electron transport in photosystem II (PSII) and photosystem I (PSI) was estimated in terms of chlorophyll fluorescence and changes in P700 redox, respectively, in the unicellular green alga Dunaliella salina in the presence or absence of a nitrogen source in the culture medium. In a nitrogen-containing medium, the quantum yield of PSII (ΦII) and that in PSI (ΦI) were at the same level in low light, but cyclic electron transport around photosystem I (CET-PSI) was induced under high light as estimated from an increase in ΦI/ΦII. High light might further enhance the rate of electron transport in PSI by inducing the state 2 transition, in which the distribution of light energy is shifted to PSI at the expense of PSII. Nitrogen deficiency resulted in a decrease in ΦII and an increase in ΦI. As a consequence, the rate of CET-PSI was expected to increase. The high CET-PSI under N deficiency was probably associated with a high level of energy quenching (qE) formation in PSII.
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Acknowledgments
This work was supported in part by grants from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and from the Ministry of Agriculture and Fishery of Japan to T. E. We would also like to thank the Iranian Ministry of Science, Research and Technology, and Office of Graduate Studies, University of Isfahan, for financial support to A. E. while visiting Japan on sabbatical.
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Einali, A., Shariati, M., Sato, F. et al. Cyclic electron transport around photosystem I and its relationship to non-photochemical quenching in the unicellular green alga Dunaliella salina under nitrogen deficiency. J Plant Res 126, 179–186 (2013). https://doi.org/10.1007/s10265-012-0512-8
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DOI: https://doi.org/10.1007/s10265-012-0512-8