Journal
AGRICULTURAL AND FOREST METEOROLOGY
Volume 150, Issue 9, Pages 1174-1181Publisher
ELSEVIER
DOI: 10.1016/j.agrformet.2010.05.001
Keywords
Allocation; C assimilation; N absorption; Elevated [CO2]; Night temperature; Rice
Categories
Funding
- Ministry of the Environment, Japan
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To estimate the combined effects of elevated [CO2] and night temperature on C assimilation, N absorption, and their allocations in rice organs, we conducted a pot experiment in controlled-environment chambers with [CO2] at 380 or 680 ppm, night temperatures of 22 or 32 degrees C, and a 32 degrees C day temperature. Whole-plant C and N concentrations were unaffected by elevated [CO2] and high night temperature, while C assimilation and N absorption increased significantly under both elevated [CO2] and high night temperature with a significant interaction of [CO2] and high night temperature. C assimilation increased under high night temperatures despite the higher C loss to night respiration. Regarding to part organs of rice, high night temperature significantly increased living leaf N concentration and area (by 7.8% and 14.5%, respectively), and enhanced photosynthetic capacity at last stage of rice growth. Elevated [CO2] did not affect C and N allocations between ear and stem during reproductive growth, but high night temperature significantly decreased C and N allocation to the ears. Because high night temperatures limited the translocation of C and N to the ear, they will reduce the stimulatory effect of elevated [CO2] on rice yield in the future if both [CO2] and temperature continue to increase. (C) 2010 Elsevier B.V. All rights reserved.
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