Photocontrol of phycoerythrin formation in the blue-green alga Tolypothrix tenuis growing in the dark
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概要
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Phycoerythrin (PE) formation induced by short fluorescent illumination (15 min, day-light type) was studied with the blue-green alga Tolypothrix tenuis growing heterotrophically in the dark. Tolypothrix tenuis grown in the dark contains phycocyanin (PC) and allophycocyanin (APC) but not PE (9,16). When cells growing exponentially in the dark were illuminated for a short period, PE was formed in the subsequent dark period. PE formation had a 3- to 5-hr lag period then occurred almost linearly for 15 to 20 hr until the formation slowed down and the PE content reached a maximum level. Further incubation generally caused a very slow decrease in PE content. Kinetic analysis indicated that the amount. of PE formed after one short illumination was as large as 35% of the amount of PE plus PC present in the cells just after illumination. Under a previously proposed hypothesis that PE/PC formation is controlled by the photochemical conversion between PE and PC precursors (10), the present result indicates that the photoreactive precursor should be present in algal cells in an amount more than 30% of the total phycobilin content, and thus a marked absorption change would be expected to occur upon photoconversion of the precursor. However, the size of spectral changes occurring under the conditions for photoconversion was only 5% of the expected value. This discrepancy excludes the feasibility of the hypothesis of a photoreactive precursor.
- 日本植物生理学会の論文
著者
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Ohki Kaori
Ocean Research Institute University Of Tokyo
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Fujita Yoshihiko
Ocean Research Institute University Of Tokyo
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