Photosynthetica, 2010 (vol. 48), issue 4

Photosynthetica 2010, 48(4):530-536 | DOI: 10.1007/s11099-010-0070-z

Effect of panicle removal on photosynthetic acclimation under elevated CO2 in rice

H. Shimono1,2,*, K. Suzuki1, K. Aoki1, T. Hasegawa3, M. Okada1
1 National Agricultural Research Center for Tohoku Region, Shimokuriyagawa, Iwate, Japan
2 Research Fellow of the Japan Society for the Promotion of Science, Tokyo, Japan
3 Department of Global Resources, National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki, Japan

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].

Keywords: acclimation; allocation; elevated CO2; photosynthesis; rice; senescence

Received: November 13, 2009; Accepted: August 3, 2010; Published: December 1, 2010Show citation

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Shimono, H., Suzuki, K., Aoki, K., Hasegawa, T., & Okada, M. (2010). Effect of panicle removal on photosynthetic acclimation under elevated CO2 in rice. Photosynthetica, 48(4), 530-536. doi: 10.1007/s11099-010-0070-z.
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