The Accumulation of Protochlorophyllide in Cells of Synechocystis PCC 6714 with a Low PSI/PSII Stoichiometry : ENVIRONMENTAL AND STRESS RESPONSES : MEMBRANES AND BIOENERGETICS
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概要
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Changes in intracellular levels of Chl a precursors were examined in relation to changes in the PSI/PSII stoichiometry in the cyanophyte Synechocystis PCC 6714. Protochlorophyllide (Pchlide) accumulated markedly in cells with a low PSI/PSII stoichiometry grown under light that is absorbed by Chl a (PSI light) whereas no accumulation occurred in cells with a high PSI/ PSII stoichiometry grown under light absorbed by phycobilisomes (PSII light). Levels of Pchlide in cells grown under PSI light decreased rapidly upon a shift to PSII light. The rapid decrease in Pchlide accompanied a transient increase in chlorophyllide a, indicating that reduction of Pchlide was enhanced by shift to PSII light. The action spectrum indicated that the Pchlide decrease upon the shift to PSII light depended on excitation of Pchlide, suggesting that the accumulation of Pchllide was due to limited excitation of Pchlide, so that Pchlide photoreduction, under PSI light. However, comparison of levels of Pchlide and the photosystem complexes in wild-type Plectonema boryanum with those in a mutant that lacked the dark Pchlide reductase (YFC 1004) indicated that dark reduction compensated for the limited photoreduction under PSI light. Similar compensation by dark reduction was confirmed with Synechocystis PCC 6714. In cultures of Synechocystis under conditions where Pchlide could not be photoreduced, accumulation of Pchlide and low PSI/PSII stoichiometry occurred only when cells were illuminated with light that preferentially excited PSI. The results indicate that the low PSI/PSII stoichiometry in cells grown under PSI light is not a result of inefficient synthesis of Chl a with a reduced rate of Pchlide photo-reduction. They suggest further that accumulation of Pchlide under PSI light results from retardation of the Chl a synthesis due to suppression of PSI synthesis.
- 日本植物生理学会の論文
著者
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Murakami Akio
Department Of Cell Biolog National Institute For Basic Biology
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Fujita Yoshihiko
Department Of Anatomy Division 1 Kinki University School Of Medicine
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Fujita Yoshihiko
Department Of Cell Biology National Institute For Basic Biology
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AIZAWA Katsunori
Department of Cell Biology, National Institute for Basic Biology
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Aizawa Katsunori
Department Of Cell Biology National Institute For Basic Biology
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FUJITA Yoshihiko
Department of Anatomy (1st Division), Kinki University School of Medicine
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