Journal
PHOTOSYNTHESIS RESEARCH
Volume 114, Issue 3, Pages 143-154Publisher
SPRINGER
DOI: 10.1007/s11120-012-9789-7
Keywords
Chlamydomonas reinhardtii; Sulfur deprivation; Chlorophyll fluorescence; PQ pool redox state; OEC integrity
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Funding
- Russian Foundation for Basic Research [10-04-00864-a]
- Russian Federal Target Programme [8077]
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Incubation of Chlamydomonas reinhardtii cells under nutrient deficiency results in the faster initial rise in the light-induced chlorophyll fluorescence kinetic curve. We showed that short-term anaerobic incubation of algal cells altered initial fluorescence in a way similar to nutrient starvation, suggesting an important role of the plastoquinones redox state in the observed effect. Bi-component analysis of highly resolved initial fluorescence rise kinetics in sulfur- or oxygen-depleted C. reinhardtii cells suggested that one of the mechanisms underlying the observed phenomenon involves primary closure (photochemical inactivation via Qa reduction) of beta-type PSII as compared to alpha-PSII. Moreover, results of modeling of the fluorescence curve brought us to the conclusion that accumulation of closed centers in alpha-PSII supercomplexes may also cause a faster initial fluorescence rise. The observed correlations between nutrient supply rate and initial fluorescence rise pattern in green algae can serve to characterize culture nutritional status in vivo.
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