NDLI: Evidence for the occurrence of photorespiration in synurophyte algae

Content Provider	Springer Nature Link
Author	Bhatti, Shabana Colman, Brian
Copyright Year	2011
Abstract	The fluxes of CO$_{2}$ and oxygen during photosynthesis by cell suspensions of Tessellaria volvocina and Mallomonas papillosa were monitored mass spectrometrically. There was no rapid uptake of CO$_{2,}$ only a slow drawdown to compensation concentrations of 26 μM for T. volvocina and 18 μM for M. papillosa, when O$_{2}$ evolution ceased, indicating a lack of active bicarbonate uptake by the cells. Darkening of the cells after a period of photosynthesis did not cause rapid release of CO$_{2}$, indicating the absence of an intracellular inorganic carbon pool. However, upon darkening a brief burst of CO$_{2}$ was observed similar to the post-illumination burst characteristic of C$_{3}$ higher plants. Treatment of the cells of both species with the membrane-permeable carbonic anhydrase inhibitor ethoxyzolamide had no adverse effect on photosynthetic rate, but stimulated the dark CO$_{2}$ burst indicating the dark oxidation of a compound formed in the light. In the absence of any active accumulation of inorganic carbon photosynthesis in these species should be inhibited by O$_{2}$. This was investigated in four synurophyte species T. volvocina, M. papillosa, Synura petersenii, and Synura uvella: photosynthetic O$_{2}$ evolution rates in all four algae, measured by O$_{2}$ electrode, were significantly higher (40–50%) in media at low O$_{2}$ (4%) than in air-equilibrated (21% O$_{2}$) media, indicating an O$_{2}$ inhibition of photosynthesis (Warburg effect) and thus the occurrence of photorespiration in these species.
Starting Page	251
Ending Page	256
Page Count	6
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	109
Issue Number	1-3
e-ISSN	15735079
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-03-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon concentrating mechanism Chrysophyte Mallomonas Mass spectrometry Photosynthesis Photorespiration Synura Tessellaria Plant Genetics & Genomics Biochemistry Plant Sciences Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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