Abstract
To examine the role of sink size on photosynthetic acclimation under elevated atmospheric CO2 concentrations ([CO2]), we tested the effects of panicle-removal (PR) treatment on photosynthesis in rice (Oryza sativa L.). Rice was grown at two [CO2] levels (ambient and ambient + 200 μmol mol−1) throughout the growing season, and at full-heading stage, at half the plants, a sink-limitation treatment was imposed by the removal of the panicles. The PR treatment alleviated the reduction of green leaf area, the contents of chlorophyll (Chl) and Rubisco after the full-heading stage, suggesting delay of senescence. Nonetheless, elevated [CO2] decreased photosynthesis (measured at current [CO2]) of plants exposed to the PR treatment. No significant [CO2] × PR interaction on photosynthesis was observed. The decrease of photosynthesis by elevated [CO2] of plants was associated with decreased leaf Rubisco content and N content. Leaf glucose content was increased by the PR treatment and also by elevated [CO2]. In conclusion, a sink-limitation in rice improved N status in the leaves, but this did not prevent the photosynthetic down-regulation under elevated [CO2].
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Abbreviations
- C i :
-
intercellular CO2 concentration
- Chl:
-
chlorophyll
- [CO2]:
-
atmospheric CO2 concentration
- DAT:
-
days after transplanting
- DM:
-
dry mass
- FM:
-
fresh mass
- g s :
-
stomatal conductance
- LA:
-
leaf area
- PPFD:
-
photosynthetic photon flux density
- PR:
-
panicle removal
- Rubisco:
-
ribulose-1,5-bisphosphate carboxylase/oxygenase
- VPD:
-
vapor pressure deficit
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Acknowledgements
We thank H. Nakamura, T. Saitoh, Y. Ookawara, M. Abe, and Y. Sato of the National Agricultural Research Center for Tohoku region for their technical assistance, and K. Tamura, K. Kudo, Y. Ohtsubo, and S. Kikuchi of the Center’s Field Management Divisions for setting up the growth chambers. We also thank Dr. K. Ohashi (University of Tokyo) and Dr. J. Sakurai (National Agricultural Research Center for Tohoku region) for their advice on our Rubisco measurements. This study was supported by the Japan Society for the Promotion of Science. We would like to acknowledge to anonymous reviewers for invaluable comments and suggestions.
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Shimono, H., Suzuki, K., Aoki, K. et al. Effect of panicle removal on photosynthetic acclimation under elevated CO2 in rice. Photosynthetica 48, 530–536 (2010). https://doi.org/10.1007/s11099-010-0070-z
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DOI: https://doi.org/10.1007/s11099-010-0070-z