Abstract
Pigment mutants CC-124y-1, СС-124у-2, and СС-124р-2 of the green microalga Chlamydomonasreinhardtii Dangeard were obtained by means of UV-induced mutagenesis. Morphological propertiesand photosynthetic activity of these mutants were examined. The mutants displayed a lowered contentof chlorophyll b and carotenoids. Analysis of fluorescence induction curves revealed the decreased ratesof electron transport in photosystem II (PSII), the increase in the fraction of QB-nonreducing centers, andthe enhancement of nonphotochemical fluorescence quenching. The mutations had no direct impact onoxidation of pigment P700 in PSI and on the decline of delayed fluorescence. The parameters of induction curves of prompt and delayed fluorescence are proposed for use in early diagnostics of UV-inducedmutagenesis. The pigment mutants obtained can be applied in biomonitoring studies.Key words: Chlamydomonas reinhardtii, chlorophyll a fluorescence, delayed fluorescence, JIP test,photosynthesis.
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