CO2 ACCUMULATION BY CHLORELLA SACCHAROPHILA (CHLOROPHYCEAE) AT LOW EXTERNAL pH: EVIDENCE FOR ACTIVE TRANSPORT OF INORGANIC CARBON AT THE CHLOROPLAST ENVELOPE

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Abstract

The CO2 uptake characteristics of the acid‐tolerant alga Chlorella saccharophila (Krüger) Nadson have been examined. These, together with direct estimations of internal inorganic C concentrations, indicate that air‐adapted cells of this alga possess a CO2 accumulation mechanism similar to that reported in other members of the Chlorophyceae and in Cyanophyceae. This accumulation mechanism operates at external pH values of 4 and less. Under these conditions CO2 must be the carbon species crossing the plasmlemma, and since preliminary evidence suggests that the transport mechanism is active primary uniport of HCO3, it is proposed that the site of the CO2 accumulation mechanism is the chloroplast envelope.

Original languageEnglish
Pages (from-to)371-373
Number of pages3
JournalJournal of Phycology
Volume17
Issue number4
DOIs
Publication statusPublished - 1 Jan 1981
Externally publishedYes

Keywords

  • acid tolerant Chlorella
  • bicarbonate transport
  • CO‐concentrating mechanism

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