Photosynthesis and Inorganic Carbon Accumulation in the Acidophilic Alga Cyanidioschyzon merolae期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Photosynthesis and Inorganic Carbon Accumulation in the Acidophilic Alga Cyanidioschyzon merolae

Authors:	Zenvirth D Volokita M Kaplan A

Affiliation:	Department of Botany, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.

Abstract:	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 ΔH⁺ decreased from −300 to −47 millivolts over the same range of extracellular pH. It is suggested that the ΔH⁺ 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.

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