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- Title
Measurement of photorespiratory activity of the submerged aquatic plant <em>Myriophyllum spicatum</em> L.
- Authors
Owttrim, G. W.; Colman, B.
- Abstract
The Co[SUB2] compensation concentrations (points) of leaves of the submerged vascular aquatic plant Myriophyllum spicatum L. were determined in a closed aqueous system at pH 7.0 by a gas chromatographic technique and over the range 10-30 °C were found to range from 36 to 46 cm[SUP-3] m[SUP-3] in medium equilibrated with 21% O[SUB2] (0.03 kg m[SUP3]), and 25 to 35 cm[SUP-3] m[SUP-3] in medium equilibrated with 2% O[SUB2] (0.03 kg m[SUB3]). The rates of true (TPS) and apparent (APS) photosynthesis of leaves were measured in medium equilibrated with 21% O[SUB2] and buffered at pH 7.0, at subsaturating concentrations (12.8-18.8 mmol m[SUP-3]) of dissolved inorganic carbon (DIC) containing H[SUP14]CO[SUP-,SUB3], by determining the initial rates of uptake by the leaves of DIC and [SUP14]C-activity from the medium. The rate of photorespiration, the difference between TPS and APS, was 7.0-13.3% of TPS over the range of 10-25°C and rose to 29% of TPS at 35°C. The magnitude of the compensation point of this plant is therefore similar to, but is much less O[SUB2]-sensitive than, those of C[SUB3] plants, and the photorespiratory rate, at DIC concentrations near the CO[SUB2] compensation point, is very low compared to that of C[SUB3] plants.
- Subjects
EURASIAN watermilfoil; PLANT photorespiration; AQUATIC plants; HALORAGACEAE
- Publication
Plant, Cell & Environment, 1989, Vol 12, Issue 8, p805
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.1989.tb01642.x