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Spectral properties of chlorophyll and photochemical activity of photosystems in chlamydomonas reinhardii pigmented mutants

, : Spectral properties of chlorophyll and photochemical activity of photosystems in chlamydomonas reinhardii pigmented mutants. Fiziologiya Rastenii (Moscow) 25(3): 500-509

As was found for a large group of pigmented mutants of C. reinhardii, the presence of native chlorophyll a forms does not depend on the quantitative accumulation of pigments and does not correlate with the content of chlorophyll b. Changes in the accumulation of chlorophyll b modify the intensity, but not the pattern, of the fluorescence spectrum for chlorophyll a, and have no effect on the photosynthetic activity of the chloroplast membranes. The absence, or a very low content, of the long-wavelength forms of chlorophyll a (689, 698 and 703 nm), is accompanied with the intensification of short-wavelength (690 nm) fluorescence of chlorophyll and the decrease in long-wavelength (718 nm) fluorescence. The ratio between the amounts of chlorophylls a and b, and the pattern of low-temperature fluorescence spectra for chlorophyll, do not correlate with the number and activity of the reaction centers of photosystems I and II. These critera reflect the state of the light-absorbing complex and chlorophyll a.

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