Ultraviolet-B induced changes in ultrastructure and D1/D2 proteins in cyanobacteria Synechococcus sp. PCC 7942

Sanjay Chauhan, Ritu Pandey, Gauri S. Singhal

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)161-167
Number of pages7
JournalPhotosynthetica
Volume35
Issue number2
DOIs
StatePublished - 1998
Externally publishedYes

Keywords

  • Carotenoids
  • Cell shape
  • Chlorophyll
  • Phycocyanin
  • Thylakoid

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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