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Effects of elevated atmospheric CO2 concentration on growth and photosynthesis in eddo at two different air temperatures
Plant Production Science ( IF 1.6 ) Pub Date : 2020-12-10
Md Akik Bin Zaher, Etsushi Kumagai, Takayuki Yabiku, Miyuki Nakajima, Toshinori Matsunami, Nobuhiko Matsuyama, Nguyen Cong Thinh, Toshihiro Hasegawa, Michio Kawasaki

ABSTRACT

Future agricultural management programs should consider the responsiveness of crops to increasing atmospheric CO2 concentrations ([CO2]) and temperatures. Eddo is an important tuber crop widely grown in Asia, but its response to [CO2] and temperatures remains largely unknown. We investigated the responses of eddo and rice plants to elevated [CO2] (ambient [CO2] + 200 µmol mol−1) at low and high temperatures during the early-to-intermediate growth stage in temperature gradient chambers in 2018 and 2019. The dry weights (DWs) of the eddo leaf blades, petioles, roots, and above-ground parts as well as the DWs of the rice leaf blades, leaf sheaths and stems, above-ground parts, and whole plants significantly increased under elevated [CO2]. The number of leaves, leaf area, and SPAD value of eddo significantly increased under elevated [CO2], whereas the leaf area and SPAD value of rice did not. The net photosynthetic rate of eddo and rice tended to increase under elevated [CO2]. The increasing ratio of the total DW in elevated vs ambient [CO2] was significantly higher for eddo than for rice. The result indicates that elevated [CO2] increases the eddo biomass more than the rice biomass, possibly because of the increasing eddo leaf area and SPAD value induced by elevated [CO2]. The total DW of rice increased significantly in response to the high air temperature under elevated [CO2] conditions. However, the effect of [CO2] on the total DW of eddo was similar at both temperatures, reflecting the non-significant interaction between [CO2] and temperature.



中文翻译:

大气CO2浓度升高对两种不同气温下eddo生长和光合作用的影响

摘要

未来的农业管理计划应考虑农作物对大气CO 2浓度([CO 2 ])和温度升高的响应能力。Eddo是亚洲广泛种植的重要块茎作物,但其对[CO 2 ]和温度的反应仍然未知。我们调查了eddo和水稻植物对[CO 2 ]升高(环境[CO 2 ] + 200 µmol mol -1)在2018年和2019年的温度梯度试验箱中处于早期和中期生长阶段的高温和低温下。eddo叶片,叶柄,根,地上部分以及DW的干重(DW)在[CO 2 ]升高的情况下,水稻叶片,叶鞘和茎,地上部分以及整个植物的数量显着增加。在[CO 2 ]升高的情况下,eddo的叶数,叶面积和SPAD值显着增加,而水稻的叶面积和SPAD值则没有。在[CO 2 ]升高的情况下,江户和水稻的净光合速率趋于增加。相对于环境[CO 2],总DW的增加比率eddo的Ed显着高于大米。结果表明,升高的[CO 2 ]比水稻的生物量增加了eddo生物量,这可能是由于升高的[CO 2 ]引起的eddo叶面积和SPAD值的增加。在升高的[CO 2 ]条件下,稻米的总DW显着增加,以应对较高的气温。但是,[CO 2 ]对eddo的总DW的影响在两个温度下都相似,反映了[CO 2 ]与温度之间没有显着的相互作用。

更新日期:2020-12-11
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