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| Effects of elevated atmospheric CO2 concentration and warming on the content of iron， zinc， and phytic acid in double cropping rice grains |
| Received:July 25, 2022 Revised:February 12, 2023 |
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| KeyWord:warming;increasing atmospheric CO2 concentration;rice;mineral elements;cumulant |
| Author Name | Affiliation | E-mail | | LI Min | College of Biological and Resource Environment, Beijing University of Agriculture, Beijing 102206, China | | | JIA Yuxuan | Sinochem Agriculture Holdings, Beijing 100031, China | | | XIA Xinyue | Beijing Zimeitang Biotechnology Co., Ltd, Beijing 100144, China | | | WANG Bin | Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, China | wangbin01@caas.cn | | SONG Chunyan | Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHU Bo | College of Agriculture, Yangtze University, Jingzhou 434022, China | | | SHI Shengwei | College of Biological and Resource Environment, Beijing University of Agriculture, Beijing 102206, China | 342866767@qq.com |
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| Abstract: |
| Global climate change, which is characterized by increasing atmospheric CO2 concentrations and warming, significantly affects agro-ecosystem productivity and food security. To reveal the impact of future climate trends on the content and accumulation of iron（Fe） and zinc（Zn）in rice, this study used Open Top Chamber（OTC）systems to simulate climate change scenarios with increasing atmospheric CO2 concentration（EC treatment, +100 μL·L-1）and warming（ET treatment, +1.5 ℃）, as well as their interactions（ETEC treatment, +1.5 ℃, +100 μL·L-1）. The study involved field experiments and observations on Fe, Zn, and phytic acid content in double cropping rice grains on the Jianghan Plain from 2017 to 2019. The results showed significant interannual variations in the response of Fe and Zn contents in rice grains to greater atmospheric CO2 concentration and warming, and the contents were more sensitive to the atmospheric CO2 concentrations than to warming. Compared with the control（CK）, Fe content in late rice grains decreased with the EC treatment in 2018 （-13.41%, P<0.05）, but increased significantly in early and late rice grains in 2019（27.95%-29.70%, P<0.05）. With the ET treatment, Zn content in early rice grains significantly decreased in 2018（-13.49%, P<0.05）. In terms of the three-year observed average, the Zn content in the EC treatment was significantly reduced in early rice grains（-8.28%, P<0.05）, while the Zn content in the ETEC treatment was significantly reduced in late rice grains（- 10.91%, P<0.05）. This study found that the positive synergistic effects of greater CO2 concentrations and warming are different for each factor. A significant reduction of Zn content in late rice grains in high temperature and drought years was observed. Accordingly, we predict an increasing risk of a "hidden hunger" for the rice-eating population under future climate change scenarios. |
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