Effects of elevated CO2 concentration on growth and photosynthesis of Chinese yam under different temperature regimes
Effects of elevated CO2 concentration on growth and photosynthesis of Chinese yam under different temperature regimes
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不同温度条件下CO2浓度升高对山药生长和光合作用的影响
DOI：
10.1080/1343943x.2017.1283963
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发表时间：
2017
影响因子：
2.5
通讯作者：
Kumagai E and Kawasaki M
中科院分区：
文献类型：
--
作者：
Thinh NC;Shimono H;Kumagai E and Kawasaki M
山药(‘山药’)在夏季和秋季分别在不同的二氧化碳浓度(CO_2)，即常温和高温条件下(环境CO_2+约200μ·−·mol·CO_1)生长。作为比较，水稻也是在这些条件下种植的。低温和高温下的平均气温夏季分别为24.1℃和29.1℃，秋季分别为20.2℃和24.9℃。在夏季试验中，在两种温度条件下，山药藤长、叶面积、叶干重(DW)和总干重均显著高于环境[CO2]。此外，在低温条件下，升高[CO2]条件下的叶片数、藤本干重和根干重显著高于环境[CO2]处理。在秋季试验中，在高温条件下，高CO2浓度下块茎干重显著高于环境CO2浓度下。这些结果表明，山药对升高的[CO2]表现出正的生长响应。方差分析表明，[CO2]×气温互作对山药总干重没有显著影响。在夏季试验中，所有生长参数的升高与环境[CO2]的比率，山药高于水稻。结果表明，夏季山药对大气CO2浓度升高的贡献率高于水稻。在夏季两种温度条件下，山药的净光合速率均显著高于环境[CO2]。在这两个实验中，高浓度的[CO2]对山药的影响很大，但对大米的影响不大。这些发现表明，与水稻相比，山药的光合作用更容易对[CO2]升高做出反应。
Chinese yam (‘yam’) was grown at different carbon dioxide concentrations ([CO2]), namely, ambient and elevated (ambient + 200 μmol mol−1), under low- and high-temperature regimes in summer and autumn, separately. For comparison, rice was also grown under these conditions. Mean air temperatures in the low- and high-temperatures were respectively 24.1 and 29.1 °C in summer experiment and 20.2 and 24.9 °C in autumn experiment. In summer experiment, yam vine length, leaf area, leaf dry weight (DW), and total DW were significantly higher under elevated [CO2] than ambient [CO2] in both temperature regimes. Additionally, number of leaves, vine DW, and root DW were significantly higher under elevated [CO2] than under ambient [CO2] in the low-temperature regime. In autumn experiment, tuber DW was significantly higher under elevated [CO2] than under ambient [CO2] in the high-temperature regime. These results demonstrate that yam shows positive growth responses to elevated [CO2]. Analysis of variance revealed that significant effect of [CO2] × air temperature interaction on yam total DW was not detected. Elevated-to-ambient [CO2] ratios of all growth parameters in summer experiment were higher in yam than in rice. The results suggest that the contribution of elevated [CO2] is higher in yam than in rice under summer. Yam net photosynthetic rate was significantly higher under elevated [CO2] than under ambient [CO2] in both temperature regimes in summer. Elevated [CO2] significantly affected on the rate in yam but not in rice in both experiments. These findings indicate that photosynthesis responds more readily to elevated [CO2] in yam than in rice.