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| Effects of Elevated CO2 Concentration and Foliar Zn Application on Zn Concentration and Bioavailability in Different Parts of Grains of Rice Wuyunjing 23 |
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| KeyWord:rice; elevated CO2; FACE（Free Air CO2 Enrichment）; foliar Zn application; Zn concentration; Zn bioavailability; phytate |
| Author Name | Affiliation | | ZHOU San-ni | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University, Yangzhou 225009, China | | LAI Shang-kun | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University, Yangzhou 225009, China | | WU Yan-zhen | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University, Yangzhou 225009, China | | WANG Yun-xia | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | | ZHU Jian-guo | Institute of Soil Science, Chinese Academy of Sciences，Nanjing 210008, China | | WANG Yu-long | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University, Yangzhou 225009, China | | YANG Lian-xin | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Yangzhou University, Yangzhou 225009, China |
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| Abstract: |
| Elevated CO2 concentrations enhance plant growth and biomass production, but may also decrease concentrations of elements in plants, thus reducing rice quality. In this study, a conventional japonica rice variety Wuyunjing 23 was grown under two levels of CO2 concentrations[ambient and （200±40）μL·L-1 higher than ambient] in a Free Air CO2 Enrichment（FACE） facility installed in a paddy field. Foliar Zn applications（0.2% ZnSO4） were performed for 3 times at 5-day interval right after flowering. Rice seeds were divided into milled rice, brown rice and bran and subjected to analysis of Zn and phytate（PA） concentrations. Zinc and PA concentrations and PA to Zn molar ratios in different parts of rice grains were all in order of milled rice < brown rice < bran, and they were respectively 4.8 times, 45.3 times and 9.6 times higher in the bran than in milled rice. Elevated CO2 had no significant effects on Zn concentrations in different parts of rice grains; while foliar Zn applications significantly increased Zn concentrations of milled rice, brown rice and bran by 8.5%, 17.1% and 22.7%, respectively. Phytate concentrations of milled rice, brown rice and bran were not affected by either CO2 or Zn treatments. The molar ratio of PA to Zn in different parts of rice grains was not affected by elevated CO2, but decreased by Zn applications by 5.2% in milled rice, 12.9%（P<0.05） in brown rice and 18.7%（P<0.05） in bran. Zinc treatment and seed part interaction had significant effects on Zn concentrations and PA to Zn molar ratios. The molar ratio of PA to Zn in brown rice or bran was negatively correlated with Zn concentration, but not with PA concentration. Our results indicate that content and bioavailability of micronutrient Zn in edible part of rice Wuyunjing 23 were not affected by elevated CO2, while foliar Zn application during grain-filling could improve Zn nutrition of rice grains, particularly in outer layer of rice grains. |
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