Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan
Rice cultivar responses to elevated CO2 at two free-air CO2 enrichment (FACE) sites in Japan
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DOI：
10.1071/fp12357
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发表时间：
2013-01-01
影响因子：
3
通讯作者：
Makino, Amane
中科院分区：
文献类型：
--
作者：
Hasegawa, Toshihiro;Sakai, Hidemitsu;Makino, Amane
有一些证据表明，水稻品种对CO2浓度升高（[CO2]）的反应不同，但[CO2] x品种的相互作用从未在不同地点的露地条件下进行过测试。在这里，我们报告了在日本的两个地点，静石（2007年和2008年）和筑波（2010年）的自由空气CO2浓缩（FACE）设施进行的试验。生长季节的平均气温在筑波比在静石高5摄氏度以上。对于四个品种在两个地点测试，[CO2] x品种的相互作用是显着的糙米产量，但没有显着的相互作用与地点年。具有较大库容量的高产品种表现出更大的[CO2]响应。包括8个品种的Tsukuba FACE试验显示出比多点试验更宽的增产范围（3-36%）。所有测试的产量构成因素都有助于这种增强，但有一个非常显着的[CO2] x品种的成熟小穗的百分比的相互作用。这些结果表明，一个大的汇是一个先决条件，更高的生产力下升高[CO2]，但提高碳分配，增加谷物设置也可能是一个切实可行的方式，提高产量响应升高[CO2]。
There is some evidence that rice cultivars respond differently to elevated CO2 concentrations ([CO2]), but [CO2] x cultivar interaction has never been tested under open-field conditions across different sites. Here, we report on trials conducted at free-air CO2 enrichment (FACE) facilities at two sites in Japan, Shizukuishi (2007 and 2008) and Tsukuba (2010). The average growing-season air temperature was more than 5 degrees C warmer at Tsukuba than at Shizukuishi. For four cultivars tested at both sites, the [CO2] x cultivar interaction was significant for brown rice yield, but there was no significant interaction with site-year. Higher-yielding cultivars with a large sink size showed a greater [CO2] response. The Tsukuba FACE experiment, which included eight cultivars, revealed a wider range of yield enhancement (3-36%) than the multi-site experiment. All of the tested yield components contributed to this enhancement, but there was a highly significant [CO2] x cultivar interaction for percentage of ripened spikelets. These results suggest that a large sink is a prerequisite for higher productivity under elevated [CO2], but that improving carbon allocation by increasing grain setting may also be a practical way of increasing the yield response to elevated [CO2].