Abstract
Gas exchange and fluorescence measurements of attached leaves of water stressed bean, sunflower and maize plants were carried out at two light intensities (250 μmol quanta m-2s-1 and 850 μmol quanta m-2s-1). Besides the restriction of transpiration and CO2 uptake, the dissipation of excess light energy was clearly reflected in the light and dark reactions of photosynthesis under stress conditions. Bean and maize plants preferentially use non-photochemical quenching for light energy dissipation. In sunflower plants, excess light energy gave rise to photochemical quenching. Autoradiography of leaves after photosynthesis in 14CO2 demonstrated the occurrence of leaf patchiness in sunflower and maize but not in bean. The contribution of CO2 recycling within the leaves to energy dissipation was investigated by studies in 2.5% oxygen to suppress photorespiration. The participation of different energy dissipating mechanisms to quanta comsumption on agriculturally relevant species is discussed.
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Abbreviations
- Fo :
-
minimal fluorescence
- Fm :
-
maximal fluorescence
- Fp :
-
peak fluorescence
- g:
-
leaf conductance
- PN :
-
net CO2 uptake
- qN :
-
coefficient of non-photochemical quenching
- qP :
-
coefficient of photochemical quenching
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Scheuermann, R., Biehler, K., Stuhlfauth, T. et al. Simultaneous gas exchange and fluorescence measurements indicate differences in the response of sunflower, bean and maize to water stress. Photosynth Res 27, 189–197 (1991). https://doi.org/10.1007/BF00035840
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DOI: https://doi.org/10.1007/BF00035840