Abstract
The effect of nitrogen supply during growth on the contribution of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco; EC 4.1.1.39) to the control of photosynthesis was examined in tobacco (Nicotiana tabacum L.). Transgenic plants transformed with antisense rbcS to produce a series of plants with a progressive decrease in the amount of Rubisco were used to allow the calculation of the flux-control coefficient of Rubisco for photosynthesis (CR). Several points emerged from the data: (i) The strength of Rubisco control of photosynthesis, as measured by CR, was altered by changes in the short-term environmental conditions. Generally, CR was increased in conditions of increased irradiance or decreased CO2. (ii) The amount of Rubisco in wild-type plants was reduced as the nitrogen supply during growth was reduced and this was associated with an increase in CR. This implied that there was a specific reduction in the amount of Rubisco compared with other components of the photosynthetic machinery. (iii) Plants grown with low nitrogen and which had genetically reduced levels of Rubisco had a higher chlorophyll content and a lower chlorophyll a/b ratio than wild-type plants. This indicated that the nitrogen made available by genetically reducing the amount of Rubisco had been re-allocated to other cellular components including light-harvesting and electron-transport proteins. It is argued that there is a “luxury” additional investment of nitrogen into Rubisco in tobacco plants grown in high nitrogen, and that Rubisco can also be considered a nitrogen-store, all be it one where the opportunity cost of the nitrogen storage is higher than in a non-functional storage protein (i.e. it allows for a slightly higher water-use efficiency and for photosynthesis to respond to temporarily high irradiance).
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Abbreviations
- CR :
-
flux control coefficient of Rubisco for photosynthesis
- rbcS:
-
gene for the Rubisco small subunit
- Rubisco:
-
ribulose-1,5-bisphosphate carboxylase-oxygenase
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W.P. Quick is grateful to Professor D.T. Clarkson (Department of Agricultural Sciences, University of Bristol, Long Ashton, UK) for pointing out the connection between stomatal conductance and nutrient availability. This work was supported by the Deutsche Forschungsgemeinschaft.
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Quick, W.P., Fichtner, K., Schulze, E.D. et al. Decreased ribulose-1,5-bisphosphate carboxylase-oxygenase in transgenic tobacco transformed with “antisense” rbcS. Planta 188, 522–531 (1992). https://doi.org/10.1007/BF00197044
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DOI: https://doi.org/10.1007/BF00197044