Changes in Stoichiometry among PSI, PSII and Cyt b_6-f Complexes in Response to Chromatic Light for Cell Growth Observed with the Red Alga Porphyra yezoensis : ENVIRONMENTAL AND STRESS RESPONSES : MEMBRANES AND BIOENERGETICS

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Stoichiometry among 3 thylakoid components, PSI and PSII and Cyt b_6-f complexes, was determined with the red alga Porphyra yezoensis with special reference to the regulation of PSI/ PSII stoichiometry in response to light regime. The ratio of PSI to PSII abundance was four times greater in thalli grown under orange light which excites mainly phycobilisome, thus PSII, than that under red light which excites preferentially Chl a, thus PSI. Cyt b_6-f abundance remained almost constant. The PSI and PSII content was regulated separately under the two growth light conditions as was also observed with the red alga Porphyridium cruentum by Cunningham et al. [(1990) Plant Physiol. 93 : 888]. This differs from the cyanophyte Synechocystis PCC 6714 where adjustment occurs only in the PSI content [(1987) Plant Cell Physiol. 28: 1547] . However, results on the marine cyanophyte Synechococcus NIBB 1071 indicate that changes in the PSI/ PSII soichiometry is similar to red algae. In this species, as in the red algae, more than one PSII is associated with each phycobilisome. The light regime also induced changes in the phycobiliprotein composition in Porphyra yezoensis. Under PSII light, phycoerythrin increased, and phycocyanin decreased, while under PSI light the response was reversed. The change suggests an occurrence of complementary chromatic adaptation.
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