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- Title
Study of photosystem 2 heterogeneity in the sulfur-deficient green alga Chlamydomonas reinhardtii.
- Authors
Taras Antal; Tatyana Krendeleva; Andrew Rubin
- Abstract
Abstract  A set of chlorophyll fluorescence methods, including PEA (Plant Efficiency Analyser), PAM (Pulse Amplitude Modulated fluorometer), and picosecond fluorometer, was employed to study PS 2 heterogeneity in sulfur deprived green algae Chlamydomonas reinhardtii. The regression method and JIP test were applied to analyze chlorophyll fluorescence kinetics. The fractions of PS 2 characterized by the energetic disconnection, smaller antenna size, elevated constant rate of primary photochemistry, and inability to maintain ÎpH-dependent energy dissipation increased essentially already after 12 h of incubation in sulfur depleted medium. The amount of PS 2 centers with reduced QA (closed state), QB-non-reducing centers with impaired water splitting function, and centers coupled to the plastoquinone pool with the slow cycle rate increased dramatically after 24 h period of deprivation. The mechanisms of PS 2 inactivation under sulfur deprivation are discussed.
- Subjects
CHLAMYDOMONADACEAE; CHLAMYDOMONAS reinhardtii; PHOTOSYNTHETIC pigments; TETRAPYRROLES
- Publication
Photosynthesis Research, 2007, Vol 94, Issue 1, p13
- ISSN
0166-8595
- Publication type
Article
- DOI
10.1007/s11120-007-9202-0