Cyclic electron transport around photosystem I and its relationship to non-photochemical quenching in the unicellular green alga Dunaliella salina under nitrogen deficiency |
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Authors: | Alireza Einali Mansour Shariati Fumihiko Sato Tsuyoshi Endo |
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Institution: | 1. Department of Biology, Faculty of Science, University of Isfahan, Hezar Jarib St., Isfahan, Iran 2. Graduate School of Biostudies, Kyoto University, Sakyo-Ku, Kyoto, 606-8502, Japan
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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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