Complementary Chromatic Adaptation in the Cyanobacterium, Tolypothrix tenuis: Location of Phycoerythrin Newly Synthesized by Green Illumination

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Phycoerythrin (PE) formation in the dark induced by green preillumination was studied with the cyanobacterium Tolypothrix tenuis (IAM M29) with special attention to the localization of newly synthesized PE. The initial synthesis of PE in the dark after preillumination was much faster than the formation of thylakoids indicated by Chl a increase. However, the amount of PE synthesized in the dark was far less than that needed for a complete change of all phycobilisomes (PBS's) to the PBS containing PE at the maximum amount. These features give rise to questions as to whether the PE synthesized in the dark is located uniformly in every PBS of every cell, or heterogeneously in limited number of cells, or PBS's newly divided or formed during the initial period of the dark incubation. To solve the question, PE formation in individual cells was followed by a microscopic fluorometry, and at the same time, PE content in fractionated PBS was deter-mined. Results indicated that (1) PE synthesis was induced uniformly in every cell even by a limited dose of green light, and (2) PE was found in almost all PBS's. These results are interpreted as that newly synthesized PE is assembled in existing PBS, and thus, formation of PE-PBS induced by green light, does not necessarily require a new assembly of PBS. However exchange between PE and phycocyanin in peripheral rods of existing PBS probably occurs at least in the initial phase of PE synthesis induced by green light.
日本植物生理学会の論文

Complementary Chromatic Adaptation in the Cyanobacterium, Tolypothrix tenuis: Location of Phycoerythrin Newly Synthesized by Green Illumination

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