Effect of UV-C on thylakoid arrangement, pigment content and nitrogenase activity in the cyanobacterium Microchaete sp.
Indian J Exp Biol
;
2013 May; 51(5): 388-392
Article
in English
| IMSEAR
| ID: sea-147606
ABSTRACT
The effect of UV-C radiation on thylakoid arrangement, chlorophyll-a and carotenoid content and nitrogenase activity of the cyanobacterium Microchaete sp. was studied. Chlorophyll-a and carotenoid content increased gradually up to 48 h of UV-C exposure but declined with longer exposures. Nitrogenase activity decreased moderately with 6 to 12 h exposure and decreased substantially afterwards. When cells exposed to UV-C for 12 to 24 h, grown under fluorescent light for 144 h, nitrogenase activity increased to levels greater than in the control cells. The exposure of UV-C treated cells to fluorescent light, however, did not result in recovery of pigment content. In Microchaete sp. cells treated with UV-C for 144 h, thylakoid membranes became dense, were aggregated into bundles, and were surrounded by spaces devoid of cytoplasm.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Pigments, Biological
/
Ultraviolet Rays
/
Cyanobacteria
/
Thylakoids
/
Microscopy, Electron, Transmission
/
Nitrogenase
Language:
English
Journal:
Indian J Exp Biol
Year:
2013
Type:
Article
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