Photosynthetica 1998, 35(2):161-167 | DOI: 10.1023/A:1006939003814

Ultraviolet-B Induced Changes in Ultrastructure and D1/D2 Proteins in Cyanobacteria Synechococcus sp. PCC 7942

Sanjay Chauhan1, Ritu Pandey1, Gauri S. Singhal1
1 Molecular Biology Laboratory, School of Life Sciences, Jalawaharlal Nehru University, New Delhi, India

Effects of ultraviolet-B (UV-B) irradiation on ultrastructure, total cellular protein, and PS2 proteins D1 and D2 of Synechococcus sp. PCC 7942 cells was studied. The scanning electron micrographs showed UV-B radiation induced bending of the cells. The transmission electron micrographs revealed disorganization and shift in thylakoid lamellar structure to one side of the cell. The cellular phycocyanin/chlorophyll ratio decreased with increasing UV-B treatment and due to this the colour of cells turned light-green. No apparent change in total cellular proteins was evident, but the contents of two major proteins of PS2, D1 and D2, showed decline due to UV-B irradiation, although to different extent.

Additional key words: carotenoids; cell shape; chlorophyll; phycocyanin; thylakoid

Prepublished online: June 1, 1998; Published: January 1, 1998  Show citation

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Chauhan, S., Pandey, R., & Singhal, G.S. (1998). Ultraviolet-B Induced Changes in Ultrastructure and D1/D2 Proteins in Cyanobacteria Synechococcus sp. PCC 7942. Photosynthetica, 35(2), 161-167. doi: 10.1023/A:1006939003814
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