Some Effects of Oxygen on Photosynthesis by Photorespiratory Mutants of Barley (Hordeum vulgareL.)
- 1 June 1988
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 39 (6) , 655-666
- https://doi.org/10.1093/jxb/39.6.655
Abstract
The photosynthetic characteristics of eleven mutant lines of barley deficient in enzymes of the photorespiratory nitrogen cycle were examined at 1%, 21% and 50% oxygen. The mutant lines could be separated into two classes: (1) those that displayed normal rates of photosynthetic CO2 assimilation when compared to wild-type rates and (2) those that exhibited low rates of CO2 assimilation at high O2 concentrations and where there was no restoration of the original rate on return to 1% O2. Chlorophyll fluorescence kinetics of the mutant lines were examined following the transfer to high O2 concentrations. Mutant lines showed more similarities than differences and it is suggested that the depletion of metabolite pools within the chloroplast is the main effect, with the rate of depletion varying not only with the mutation, but also with light intensity and O2 concentration.Keywords
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