Induction of Fluorescence in Quinone Poisoned Chlorella Cells.

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Abstract
Quinone (10-4 - 10-3) brings simplification in the induction of fluorescence of Chlorella. It is assumed that the fluorescence emission can be split into 2 parts: a constant background and a part subject to induction. The latter consists of a rapid rise followed by a slower bimolecular decay; it is believed to reflect the changes in composition of a chlorophyll complex. During the fluorescence rise, a 1st form of the complex (ChlO, photoactive non-fluorescent) is photochemically dissociated into a 2nd form (Chip, fluorescent non-photoactive) plus a substance which, after a thermal transformation, recombines with ChlP during the subsequent fluorescent decline, giving a 3rd form (ChlS, non-fluorescent non-photoactive). ChlS is transformed back into ChlO by a slow thermal reaction. The effects of inhibitors, temperature and light intensity are consistent with this mechanism. It is assumed that the constant fluorescent background arises from a distinct fraction of chlorophyll which does not take part in photochemistry and merely acts as a photic acceptor, transferring its energy to the photoactive complex.

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