quantum yield

Kromkamp, Jacco kromkamp at cemo.nioo.knaw.nl
Fri Aug 30 10:03:37 EST 1996


hello,

I'm working with eukaryotic marine microalgae and investigating how oxygen
evolution and PSII quantum efficiency is regulated in nutrient rich, light
limited continuous cultures. The maximum PSII quantum efficiency (Fv/Fm) I
seem to be able to get using PAM measurements (and saturating multiple
turnover flashes) seems to be around 0.65, but never as high as 0.8-0.85, as
found for higher plants.
 Any suggestions for possible causes? Might it be due to the fact that the
excitation light (standard red LED for measuring ligh) is poorly absorbed?
Or is it due to the fact that I use chlorophyll a/c containing species
(diatoms, Prymnesiophytes), which do not show stacking in the chloroplasts?

Jacco

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Jacco Kromkamp
NIOO-CEMO
Vierstraat 28, 4401 EA Yerseke
The Netherlands
email: kromkamp at cemo.nioo.knaw.nl
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