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Phosphate Limitation in Isochrysis Galbana

  • Ronny Herzig
Part of the Environmental Science Research book series (ESRH, volume 43)

Abstract

The effect of steady-state phosphorus limitation on photosynthetic characteristics was examined in the marine haptophyte Isochrysis galbana Green. Phosphate-limited chemostates were maintained at four dilution rates, ranging from 0.13 – 0.78 d−1, under continuous irradiance levels of 175 μmole quanta m−2 s−1, which saturated photosynthesis at all growth rates. Phosphate limitation led to an overall reduction in pigmentation and a decrease in the cellular concentration of reaction centers; however, the optical absorption cross-section, normalized to chlorophyll a, increased. Light-saturated photosynthetic rates normalized to chlorophyll a remained relatively constant. The PSII/PSI ratio increased from 2.18 to 2.66 over the dilution rates, and PSI decreased much faster than PSII. The average turnover time for light-saturated photosynthetic electron transport from water to carbon dioxide increased from 6.76 to 8.51 ms.

Keywords

Dilution Rate Export Production Photosynthetic Characteristic Cellular Concentration Phosphate Limitation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Ronny Herzig
    • 1
  1. 1.Haifa University — OranimTivonIsrael

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