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Photoactivation of Oxygen‐evolving System in Dark‐grown Spruce Seedlings
Author(s) -
OKU TATSUO,
TOMITA GIITI
Publication year - 1976
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1976.tb03987.x
Subject(s) - photosystem ii , thylakoid , oxygen evolution , photosynthesis , plastid , photosystem , biophysics , photochemistry , photosystem i , botany , chemistry , fluorescence , chloroplast , oxygen , chlorophyll fluorescence , biology , biochemistry , electrochemistry , physics , optics , gene , electrode , organic chemistry
Plastids prepared from dark‐grown spruce seedlings showed a negligible activity of photosystem II, and no fluorescence variation was observed during actinic illumination. The photosystem II reaction centre, however, was present in primary thylakoids. Exposure of such seedlings to continuous light induced the development of photosystem II activity via three stages (rapid, lagged and gradual), and the variable fluorescence appeared. The rapid development of photosystem II may be attributed to the activation of the oxygen‐evolving system, possibly the manganese‐catalyzing site, and the lagged and gradual developments may be closely related to the formation of thylakoid membranes and their assembly to grana.