A possible mechanism of mineral responses to elevated atmospheric CO2 in rice grains

GUO Jia; ZHANG Ming-qian; WANG Xiao-wen; ZHANG Wei-jian

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A possible mechanism of mineral responses to elevated atmospheric CO2 in rice grains

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Increasing attentions have been paid to mineral concentration decrease in miled rice grains caused by CO2 enrichment, but the mechanisms stil 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 signiifcantly increased the biomass of stem and panicle by 21.9 and 24.0%, respectively, but did not affect the leaf biomass. (2) Elevated CO2 signiifcantly 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 miled 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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《农业科学学报（英文版）》 |2015年第1期|50-58|共9页
作者
GUO Jia; ZHANG Ming-qian; WANG Xiao-wen; ZHANG Wei-jian;
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Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, P.R.China;

Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, P.R.China;

Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, P.R.China;

Institute of Applied Ecology, Nanjing Agricultural University, Nanjing 210095, P.R.China;

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A possible mechanism of mineral responses to elevated atmospheric CO2 in rice grains

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