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Foliar Zn Spraying Simultaneously Improved Concentrations and Bioavailability of Zn and Fe in Maize Grains Irrespective of Foliar Sucrose Supply

文献类型： 外文期刊

作者： Xia, Haiyong 1 ; Kong, Weilin 1 ; Wang, Lan 1 ; Xue, Yanhui 1 ; Liu, Wenlong 4 ; Zhang, Chunyan 5 ; Yang, Shenggang 6 ; L 1 ;

作者机构： 1.Shandong Acad Agr Sci, Crop Res Inst, Shandong Prov Key Lab Crop Genet Improvement Ecol, Jinan 250100, Shandong, Peoples R China

2.Shandong Normal Univ, Coll Life Sci, Jinan 250014, Shandong, Peoples R China

3.Shandong Acad Agr Sci, Natl Engn Lab Wheat & Maize, Jinan 250100, Shandong, Peoples R China

4.Kingenta Ecol Engn Grp Co Ltd, State Key Lab Efficient Dev & Comprehens Utilizat, Linyi 276799, Shandong, Peoples R China

5.Linyi Acad Agr Sci, Linyi 276012, Shandong, Peoples R China

6.Laoling Ronghai Selenium Enrichment Food Co Ltd, Laoling 253602, Peoples R China

关键词： micronutrients; biofortification; cereals; carbohydrates; foliar application; remobilization

期刊名称：AGRONOMY-BASEL （ 影响因子：3.417； 五年影响因子：3.64 ）

ISSN： 2073-4395

年卷期： 2019 年 9 卷 7 期

页码：

收录情况： SCI

摘要： Zinc (Zn) deficiency is a global nutritional problem that is reduced through agronomic biofortification. In the current study, the effects of foliar spraying of exogenous ZnSO4 center dot 7H(2)O (0.2% in Quzhou and 0.3% in Licheng, w/v) and/or sucrose (10.0%, w/v) on maize (Zea mays L.) agronomic traits; concentrations of Zn, iron (Fe), calcium (Ca), total phosphorus (P), phytic acid (PA) P, carbon (C), and nitrogen (N); C/N ratios; and Zn and Fe bioavailability (as evaluated by molar ratios of PA/Zn, PA x Ca/Zn, PA/Fe and PA x Ca/Fe) in maize grains were studied under field conditions for two years at two experimental locations. The results confirmed that there were no significant differences in maize agronomic traits following the various foliar treatments. Compared with the control treatment of foliar spraying with deionized water, foliar applications of Zn alone or combined with sucrose significantly increased maize grain Zn concentrations by 29.2-58.3% in Quzhou (from 18.4-19.9 to 25.2-29.6 mg/kg) and by 39.8-47.8% in Licheng (from 24.9 to 34.8-36.8 mg/kg), as well as its bioavailability. No significant differences were found between the foliar spraying of deionized water and sucrose, and between Zn-only and "sucrose + Zn" at each N application rate and across different N application rates and experimental sites. Similar results were observed for maize grain Fe concentrations and bioavailability, but the Fe concentration increased to a smaller extent than Zn. Foliar Zn spraying alone or with sucrose increased maize grain Fe concentrations by 4.7-28.4% in Quzhou (from 13.4-17.1 to 15.2-18.5 mg/kg) and by 15.4-25.0% in Licheng (from 24.0 to 27.7-30.0 mg/kg). Iron concentrations were significantly and positively correlated with Zn at each N application rate and across different N application rates and experimental locations, indicating that foliar Zn spraying facilitated the transport of endogenous Fe to maize grains. Therefore, foliar Zn spraying increased the Zn concentration and bioavailability in maize grains irrespective of foliar sucrose supply while also improving Fe concentrations and bioavailability to some extent. This is a promising agricultural practice for simultaneous Zn and Fe biofortification in maize grains, i.e., "killing two birds with one stone".

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