Photoheterotrophic growth of a filamentous cyanobacterium Calothrix sp. PCC 7601, which is capable for complementary chromatic adaptation, in the presence of glucose was accompanied by changes in the content of phycobiliproteins. Glucose, a source of energy and a metabolism regulator, differently affected the level of major phycobilisome pigments, phycocyanin (PC) and phycoerythrin (PE) in the cells. When red light enhanced PC synthesis, glucose enhanced it additionally. When green light suppressed PC synthesis, glucose did not affect it. Under both light regimes, glucose inhibited PE synthesis. Thus, glucose oppositely affected the content of two major phycobiliproteins. Glucose not only affected the ratio between phycobiliproteins but also decreased the content of carotenoids, inhibited activity of photosystem II, and affected cell sizes. A stereochemical analog of glucose, 2-deoxy-D-glucose, induced effects similar to those of glucose. A comparison with the effects of red and green light demonstrated that glucose acted on Calothrix similarly to red light and oppositely to green light.
Russian Journal of Plant Physiology – Springer Journals
Published: Apr 7, 2005
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