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| Effect of foliar zinc application on zinc nutrient levels of different rice cultivars |
| Received:October 08, 2018 |
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| KeyWord:rice;zinc;bioavailability;biofortification;stomatal conductance;leaf structural characteristics |
| Author Name | Affiliation | E-mail | | ZHANG Xin | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | HU Shao-wu | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | ZHANG Yan-liu | Yangzhou University/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 | | | SHAO Zai-sheng | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | YANG Yang | 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 | | | WANG Yun-xia | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | | | YANG Lian-xin | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | lxyang@yzu.edu.cn |
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| Abstract: |
| The effects of foliar Zn application during the early grain-filling stage on Zn concentration and Zn bioavailability in rice and its relationship with leaf stomata characteristics were studied to provide a scientific basis for effective Zn biofortification in rice production. Six rice cultivars with different seed Zn contents were grown under soil culture conditions from 2016-2017. Foliar Zn spray(0.2% ZnSO4) was applied at heading, 6 d after heading(DAH), and 12 DAH, and the same amount of water was sprayed as the control. The stomatal conductance and stomatal structure of flag leaves were measured at the heading and early grain-filling stages. The yield traits, Zn concentration, phytic acid concentration, and molar ratio of phytic acid to Zn in brown rice were determined at plant maturity. Although foliar Zn application had no significant effect on the grain yield of rice, it significantly changed the Zn nutrition level of brown rice. Averaged over 2 a, Zn application increased the Zn concentration in brown rice by 27.9%(P<0.01). Zn application did not affect the phytic acid concentration of brown rice, but molar ratio of phytic acid to Zn decreased by 23.4%(P<0.01)on average. The effects of foliar Zn application during the early grain-filling stage on the Zn concentration, phytic acid concentration, and molar ratio of phytic acid to Zn in brown rice varied with cultivars, as shown by the significant Zn treatment by cultivar interactions. The responses of the three cultivars with low seed Zn content were significantly greater than those of the three cultivars with high seed Zn content. The correlation analysis showed that the increment of Zn concentration in the brown rice due to foliar Zn application was significantly positively correlated with the stomatal conductance at the early grain-filling stage, but not related to the stomatal length or density. In conclusion, foliar Zn application during the early grain-filling stage can significantly increase the Zn concentration and bioavailability in brown rice, and the increment varied with cultivars.The low level of seed Zn and the large stomatal conductance of leaves may be beneficial for the absorption of Zn fertilizer into rice leaves. |
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