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| Effects of free air CO2 enrichment and foliar zinc application on the grain zinc nutrition of rice |
| Received:July 31, 2020 |
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| KeyWord:rice;foliar zinc application;zinc concentration;phytic acid;zinc availability |
| Author Name | Affiliation | E-mail | | YANG Yang | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | | | HU Shao-wu | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | NIU Xi-chao | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | | | TONG Kai-cheng | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | | | CHEN Chen | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | YANG Lian-xin | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | WANG Yun-xia | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | yxwang@yzu.edu.cn |
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| Abstract: |
| More than half of the world's population uses rice as a staple food, and increasing the zinc nutrition level in rice is vital to solve the problem of human zinc deficiency. In 2018, nine rice cultivars were grown at ambient and elevated CO2 concentrations(200 μmol·mol-1 higher than ambient)in a Free Air CO2 Enrichment(FACE)facility installed in a paddy field. Foliar zinc application(0.2% ZnSO4) commenced immediately after the flowering period three times at an interval of every five days. At plant maturity, the response of the brown rice yield, grain zinc concentration, and bioavailability in different rice cultivars to CO2 and zinc treatment were studied, and the effect of elevated CO2 on zinc fertilizer use efficiency was determined. The results showed that high CO2 significantly increased the brown rice yield by 15.7%. However, zinc concentration, phytic acid concentration, and the molar ratio of phytic acid to zinc of brown rice were not affected by elevated CO2, which was the same trend observed for different rice cultivars and different zinc treatments. The grain zinc use efficiency of Indica rice cultivars YD6 and LLY1988 decreased under elevated CO2 levels, but other rice cultivars showed no significant changes. Foliar zinc application had no effect on the phytic acid concentration and yield of brown rice. Foliar zinc application significantly increased the zinc concentration of brown rice by 37.3% on average but significantly reduced the molar ratio of phytic acid to zinc in brown rice by 29.1%, and the magnitude of each response varied significantly among cultivars. These results suggest that the spraying of zinc fertilizer on a leaf surface after flowering significantly improve the zinc nutrient levels of rice at both ambient and elevated CO 2 levels. Improvements varied with cultivars, but the zinc use efficiency of some Indica cultivars decreased with elevated CO2. |
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