期刊
PLANT PRODUCTION SCIENCE
卷 20, 期 2, 页码 227-236出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/1343943X.2017.1283963
关键词
Chinese yam; elevated CO2; nagaimo; photosynthesis; rice
类别
资金
- Grants-in-Aid for Scientific Research [15K07269] Funding Source: KAKEN
Chinese yam (yam') was grown at different carbon dioxide concentrations ([CO2]), namely, ambient and elevated (ambient+200molmol(-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 degrees C in summer experiment and 20.2 and 24.9 degrees 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] x 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.
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