pH-dependent cadmium transport inhibits photosynthesis in the cyanobacterium Synechocystis aquatilis

Pawlik, B (author)

Skowroński, T (author)

Ramazanow, Z (author)

Gardeström, Per, 1950- (author): Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)

Samuelsson, Göran, 1951- (author): Umeå universitet,Institutionen för fysiologisk botanik,Umeå Plant Science Centre (UPSC)

(creator_code:org_t)

1993
1993
English.
In: Environmental and Experimental Botany. - 0098-8472 .- 1873-7307. ; 33:2, s. 331-337

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; https://urn.kb.se/re...; show less...

Abstract Subject headings

Short-term (5-120 sec) transport of cadmium (Cd-109) into cells of the unicellular cyanobacterium Synechocystis aquatilis was studied using a rapid filtration technique. The transport was strongly pH-dependent, occurring at pH 7, but not at pH 5.5, and was also observed in long-term (40 min) experiments. For this process the optimum pH was approximately 7.5; uptake was considerably reduced at lower pHs. The entrance of cadmium disturbed photosynthetic activity and related processes. At pH 7, cadmium (8.9 muM) decreased CO2 fixation by about 55%, inhibited carbonic anhydrase activity (completely in intact cells, by 65%, in cell-free extracts) and photosynthetic O2-evolution by about 50%. At pH 5.5 no effects were observed.

By the author/editor: Pawlik, B; Skowroński, T; Ramazanow, Z; Gardeström, Per, ...; Samuelsson, Göra ...

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