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| A possible mechanism of mineral responses to elevated atmospheric CO2 in rice grains |
| GUO Jia, ZHANG Ming-qian, WANG Xiao-wen, ZHANG Wei-jian |
1、Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, P.R.China
2、Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, P.R.China
3、Technology Center of China Tobacco Fujian Industrial Co., Ltd, Xiamen 361021, P.R.China
4、Chinese Academy of Engineering, Beijing 100088, P.R.China
5、Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Ecology, Physiology & Production,
Ministry of Agriculture, Beijing 100081, P.R.China |
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摘要 Increasing attentions have been paid to mineral concentration decrease in milled rice grains caused by CO2 enrichment, but the mechanisms still remain unclear. Therefore, mineral (Ca, Mg, Fe, Zn and Mn) translocation in plant-soil system with a FACE (Free-air CO2 enrichment) experiment were investigated in Eastern China after 4-yr operation. Results mainly showed that: (1) elevated CO2 significantly increased the biomass of stem and panicle by 21.9 and 24.0%, respectively, but did not affect the leaf biomass. (2) Elevated CO2 significantly increased the contents of Ca, Mg, Fe, Zn, and Mn in panicle by 61.2, 28.9, 87.0, 36.7, and 66.0%, respectively, and in stem by 13.2, 21.3, 47.2, 91.8, and 25.2%, respectively, but did not affect them in leaf. (3) Elevated CO2 had positive effects on the weight ratio of mineral/biomass in stem and panicle. Our results suggest that elevated CO2 can favor the translocation of Ca, Mg, Fe, Zn, and Mn from soil to stem and panicle. The CO2-led mineral decline in milled rice grains may mainly attribute to the CO2-led unbalanced stimulations on the translocations of minerals and carbohydrates from vegetative parts (e.g., leaf, stem, branch and husk) to the grains.
Abstract Increasing attentions have been paid to mineral concentration decrease in milled rice grains caused by CO2 enrichment, but the mechanisms still remain unclear. Therefore, mineral (Ca, Mg, Fe, Zn and Mn) translocation in plant-soil system with a FACE (Free-air CO2 enrichment) experiment were investigated in Eastern China after 4-yr operation. Results mainly showed that: (1) elevated CO2 significantly increased the biomass of stem and panicle by 21.9 and 24.0%, respectively, but did not affect the leaf biomass. (2) Elevated CO2 significantly increased the contents of Ca, Mg, Fe, Zn, and Mn in panicle by 61.2, 28.9, 87.0, 36.7, and 66.0%, respectively, and in stem by 13.2, 21.3, 47.2, 91.8, and 25.2%, respectively, but did not affect them in leaf. (3) Elevated CO2 had positive effects on the weight ratio of mineral/biomass in stem and panicle. Our results suggest that elevated CO2 can favor the translocation of Ca, Mg, Fe, Zn, and Mn from soil to stem and panicle. The CO2-led mineral decline in milled rice grains may mainly attribute to the CO2-led unbalanced stimulations on the translocations of minerals and carbohydrates from vegetative parts (e.g., leaf, stem, branch and husk) to the grains.
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Received: 05 March 2014
Accepted:
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| Fund: This work was supported by the National Natural Science Foundation of China (31200369), the Lecture and Study for Outstanding Scholars from Home and Abroad, Chinese Academy of Forestry (CAF), 2014. |
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Corresponding Authors:
ZHANG Wei-jian, Tel/Fax: +86-10-62156856,E-mail: zhangweijian@caas.cn; WANG Xiao-wen, Tel: +86-10-62824186, Fax: +86-10-62824182, E-mail: wxw@cae.cn
E-mail: zhangweijian@caas.cn;wxw@cae.cn
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Cite this article:
GUO Jia, ZHANG Ming-qian, WANG Xiao-wen, ZHANG Wei-jian.
2015.
A possible mechanism of mineral responses to elevated atmospheric CO2 in rice grains. Journal of Integrative Agriculture, 14(1): 50-57.
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