Combined effects of elevated [CO2] and high night temperature on carbon assimilation, nitrogen absorption, and the allocations of C and N by rice (Oryza sativa L.)
Combined effects of elevated [CO2] and high night temperature on carbon assimilation, nitrogen absorption, and the allocations of C and N by rice (Oryza sativa L.)
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DOI：
10.1016/j.agrformet.2010.05.001
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发表时间：
2010-08-15
影响因子：
6.2
通讯作者：
Hasegawa, Toshihiro
中科院分区：
文献类型：
--
作者：
Cheng, Weiguo;Sakai, Hidemitsu;Hasegawa, Toshihiro
为了评估[CO2]和夜间温度升高对水稻器官C同化，N吸收及其分配的综合影响，我们在受控环境室中进行了盆栽试验，[CO2]为380或680 ppm，夜间温度为22或32 ℃，白天温度为32 ℃。全株C和N浓度不受[CO2]升高和高夜温的影响，而C同化和N吸收在[CO2]升高和高夜温下均显著增加，且[CO2]和高夜温具有显著的交互作用。尽管夜间呼吸的碳损失较高，但夜间高温下的碳同化增加。夜间高温显著提高了水稻部分器官的活叶氮浓度和面积（分别提高7.8%和14.5%），增强了水稻生育后期的光合能力。CO2浓度升高不影响C和N分配穗和茎在生殖生长过程中，但高夜间温度显着降低C和N分配到穗。由于夜间高温限制了C和N向穗部的转运，如果[CO2]和温度继续升高，它们将降低[CO2]升高对水稻产量的刺激作用。(C)2010爱思唯尔有限公司版权所有。
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.