Alterations in Photosystem II Organization by Cobalt Treatment in the Cyanobacterium Spirulina piatensis |
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Authors: | T. Sudhakar Babu S. C. Sabat Prasanna Mohanty |
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Affiliation: | 1. School of Life Sciences, Jawaharlal Nehru University, New Delhi, 110 067, India
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Abstract: | The presence of low concentrations of cobalt ions (200 μMCoCl2) retarded the growth of the cyanobacterium Spirulina platensis. However, cells grown in the presence of CoCl2 exhibited an enhancement in the levels of phycocyanin and carotenoids, while showed a decrease in the content of chlorophyll a, when compared to the untreated control cells. Thylakoid membranes isolated from CoCl2 treated cells demonstrated enhanced rates of both photosystem II (H2O → pBQ) and photosystem I (DCPIPH2 → MV) mediated electorn transport activities. The stimulation in the rates of photosynthetic electron transport activities in the CoCl 2 grown cells are attributed to the alterations occurring in the thylakoid membrane organization, as the thylakoids from CoCl2 grown cells possessed more membrane fluidity. The decrease in the chlorophyll a content may have occurred due to modifications in the chlorophyll a complexes in this cynaobacterium. The enhancement in the phycocyanin levels in the CoCl2 grown cells appears to be because of the stimulated induction of heme oxygenase. Thus, the cobalt ion treatment appears to be useful in studying the thylakoid membrane and antennae organizations in cyanobacteria. |
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