College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China.
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource, Nanjing Agricultural University, Nanjing, 210095, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Mar;29(12):17150-17161. doi: 10.1007/s11356-021-17003-6. Epub 2021 Oct 17.
Cadmium (Cd) in agricultural soils can be absorbed by wheat and transferred into the grains, risking human health. In order to find the optimal foliar treatment method to reduce Cd accumulation in wheat grain, nineteen single-factor foliar treatments and multi-factor combination treatments were used to study the effects of different foliar sprays on Cd accumulation of wheat grain. The results showed that the foliar application of ethylenediaminetetraacetate (EDTA), selenium (Se), and sodium nitroprusside (SNP) can significantly reduce Cd concentration in wheat grains by 49.2%, 29.6%, and 28.8%, respectively, in the field. Foliar application of EDTA, Se, zinc (Zn), ascorbic acid (ASC), silicon (Si), and molybdenum (Mo) can significantly reduce Cd concentration of wheat grains by 32.3%, 32.0%, 27.7%, 27.7%, 26.3%, and 25.9%, respectively, in pot experiment. Foliar application of 2 mM EDTA and 2 mM Se exerted excellent effects on controlling the Cd accumulation of wheat grains both in pot and field experiment. Foliar application with 0.1 mM Se or 2 mM EDTA significantly reduced Cd concentrations in grains both in grain filling stage and heading + grain filling stage. Spraying at the filling stage has a better effect on reducing Cd concentration in grains than spraying at the heading stage. In addition, the relationship between Cd concentration in grains and husks was significantly positive, while the Cd concentration in grains and flag leaves was significantly negative. Our research proves that foliar spraying of Se and EDTA is feasible to reduce the Cd concentration in wheat grains, which provides technical guidance for the safe production of wheat in low-Cd-contaminated soils.
土壤中的镉（Cd）可被小麦吸收并转移到籽粒中，从而威胁到人类健康。为了寻找降低小麦籽粒镉积累的最佳叶面处理方法，采用 19 种单因素叶面处理和多因素组合处理方法，研究了不同叶面喷施对小麦籽粒镉积累的影响。结果表明，田间条件下，叶面喷施乙二胺四乙酸（EDTA）、硒（Se）和硝普钠（SNP）可使小麦籽粒中 Cd 浓度分别显著降低 49.2%、29.6%和 28.8%。叶面喷施 EDTA、Se、锌（Zn）、抗坏血酸（ASC）、硅（Si）和钼（Mo）可使盆栽小麦籽粒中 Cd 浓度分别显著降低 32.3%、32.0%、27.7%、27.7%、26.3%和 25.9%。在盆栽和田间试验中，2 mM EDTA 和 2 mM Se 的叶面喷施对控制小麦籽粒 Cd 积累均具有优异的效果。在灌浆期和抽穗+灌浆期叶面喷施 0.1 mM Se 或 2 mM EDTA 均可显著降低籽粒中 Cd 浓度。在灌浆期喷施比在抽穗期喷施对降低籽粒 Cd 浓度的效果更好。此外，籽粒中 Cd 浓度与壳之间呈显著正相关，而与旗叶中的 Cd 浓度呈显著负相关。我们的研究证明，叶面喷施 Se 和 EDTA 是可行的，可降低小麦籽粒中的 Cd 浓度，为低 Cd 污染土壤中小麦的安全生产提供了技术指导。
