Cu uptake in a cyanobacterium: Fate of selected photochemical reactions
Date
1992Author
Pandey, PK
Singh, CB
Singh, SP
Type
ArticleLanguage
enMetadata
Show full item recordAbstract
Cu uptake in the diazotrophic cyanobacteriumNostoc calcicola Bréb. was accompanied by inhibitions in the in vivo activities of photosystem (PS) II, PS I,14CO2-fixation, and decline in the ATP pool. Cyanobacterial cells, while saturated for Cu uptake within 1 h at 40 μM Cu, showed more than 50% inhibition of PS II and 95.4% of14CO2 fixation compared with only 15.5% decrease in the PS I activity. The total extractable ATP content also declined by 32.2% within 1 h. In a subsequent follow-up study lasting 72 h, PS II activity and14CO2 fixation showed complete inhibition, in contrast to 34.4% of PS I activity and 4.2% of ATP still remaining unaffected. The results have been discussed in the light of multiple effects of Cu during and subsequent to its uptake by the cyanobacterium.
Citation
Current Microbiology January 1992, Volume 24, Issue 1, pp 35-39Publisher
Springer-Verlag College of Biological Sciences, University of Nairobi