PHOTOSYNTHETIC CARBON METABOLISM IN ENTEROMORPHA COMPRESSA (CHLOROPHYTA)

Sven Beer*, Bryan Shragge

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The intertidal macroalga Enteromorpha compressa showed the ability to use HCO3 as an exogenous inorganic carbon (Ci) source for photosynthesis. However, although the natural seawater concentration of this carbon form was saturating, additional CO2 above ambient Ci levels doubled net photosynthetic rates. Therefore, the productivity of this alga, when submerged, is likely to be limited by Ci. When plants were exposed to air, photosynthetic rates saturated at air‐levels of CO2 during mild desiccation. Based on carbon fixing enzyme activities and Ci pulsechase incorporation patterns, it was found that Enteromorpha is a C3 plant. However, this alga did not show O2 inhibited photosynthetic rates at natural seawater Ci conditions. It is suggested that such a C4‐ like gas exchange response is due to the HCO3 utilization system concentrating CO2 intracellularly, thus alleviating apparent photorespiration.

Original languageEnglish
Pages (from-to)580-584
Number of pages5
JournalJournal of Phycology
Volume23
Issue number4
DOIs
StatePublished - Dec 1987

Keywords

  • Enteromorpha
  • carbon fixation
  • intertidal
  • photosynthesis

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