Stimulating photosynthetic processes increases productivity and water-use efficiency in the field
Stimulating photosynthetic processes increases productivity and water-use efficiency in the field"
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Previous studies have demonstrated that the independent stimulation of either electron transport or RuBP regeneration can increase the rate of photosynthetic carbon assimilation and plant
biomass. In this paper, we present evidence that a multigene approach to simultaneously manipulate these two processes provides a further stimulation of photosynthesis. We report on the
introduction of the cyanobacterial bifunctional enzyme fructose-1,6-bisphosphatase/sedoheptulose-1,7-bisphosphatase or the overexpression of the plant enzyme
sedoheptulose-1,7-bisphosphatase, together with the expression of the red algal protein cytochrome c6, and show that a further increase in biomass accumulation under both glasshouse and
field conditions can be achieved. Furthermore, we provide evidence that the stimulation of both electron transport and RuBP regeneration can lead to enhanced intrinsic water-use efficiency
under field conditions.
The data that support the findings of this study, the plant transformation constructs and the seed are available from the corresponding authors on reasonable request.
This study was supported by the Realising Improved Photosynthetic Efficiency (RIPE) initiative awarded to C.A.R. by the University of Illinois. RIPE was possible through support from the
Bill & Melinda Gates Foundation, DFID and FFAR, grant no. OPP1172157. This work was also supported by the Biotechnology and Biological Sciences Research Council (BBSRC) grant no.
BB/J004138/1. We thank J. Matthews (University of Essex) for help with the data analysis, E. A. Pelech (University of Illinois) and S. Subramaniam (University of Essex) for help with plant
growth, P. A. Davey (University of Essex) and R. Gossen (University of Helsinki) for help with gas exchange, and D. Drag, B. Harbaugh and the Ort lab (University of Illinois) for support
with the field trials.
These authors contributed equally: Patricia E. López-Calcagno, Kenny L. Brown, Andrew J. Simkin.
School of Life Sciences, University of Essex, Colchester, UK
Patricia E. López-Calcagno, Kenny L. Brown, Andrew J. Simkin, Stuart J. Fisk, Silvere Vialet-Chabrand, Tracy Lawson & Christine A. Raines
P.E.L.-C. and A.J.S. generated the transgenic plants. P.E.L.-C., A.J.S., K.L.B. and S.J.F. performed the molecular and biochemical experiments. P.E.L.-C., A.J.S. and K.L.B. carried out the
plant phenotypic and growth analysis and performed the gas-exchange measurements. S.V.-C. made the measurements of photosynthesis during light induction. A.J.S. and S.J.F. performed the
enzyme assays on selected lines. All authors carried out data analysis on their respective contributions. C.A.R. and T.L. designed and supervised the research. P.E.L.-C., A.J.S. and C.A.R.
wrote the manuscript. T.L. contributed to the editing of the manuscript and finalizing of the figures.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
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