This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Zenvirth, D. Articles by Kaplan, A. Search for Related Content PubMed PubMed Citation Articles by Zenvirth, D. Articles by Kaplan, A. Agricola Articles by Zenvirth, D. Articles by Kaplan, A.

Articles

Photosynthesis and Inorganic Carbon Accumulation in the Acidophilic Alga Cyanidioschyzon merolae ¹

Department of Botany, The Hebrew University of Jerusalem, Jerusalem 91904, Israel

The intracellular pH and membrane potential were determined in the acidophilic algae Cyanidoschyzon merolae as a function of extracellular pH. The alga appear to be capable of maintaining the intracellular pH at the range of 6.35 to 7.1 over the extracellular pH range of 1.5 to 7.5. The membrane potential increase from –12 millivolts (negative inside) to –71 millivolts and thus H⁺ decreased from –300 to –47 millivolts over the same range of extracellular pH. It is suggested that the H⁺ may set the upper and lower limits of pH for growth. Photosynthetic performance was also determined as a function of pH. The cells appeared to utilize CO₂ from the medium as the apparent K_m(co2) was 2 to 3 micromolar CO₂ over the pH range of 1.5 to 7.5 C. merolae appear to possess a `CO₂ concentrating' mechanism.

This article has been cited by other articles:

				J. A. RAVEN, A. M. JOHNSTON, J. E. KUBLER, R. KORB, S. G. MCINROY, L. L. HANDLEY, C. M. SCRIMGEOUR, D. I. WALKER, J. BEARDALL, M. N. CLAYTON, et al. Seaweeds in Cold Seas: Evolution and Carbon Acquisition Ann. Bot., October 1, 2002; 90(4): 525 - 536. [Abstract] [Full Text] [PDF]