Rice Research Institute, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China.
Environ Sci Pollut Res Int. 2020 May;27(14):16940-16949. doi: 10.1007/s11356-020-08202-8. Epub 2020 Mar 6.
Selenium (Se) is an essential micronutrient and important component of oxidase which protects cell membranes, eliminate the role of free radicals in the human body. Se is necessary for low Se rice genotypes and Se deficient areas. Zinc (Zn) is a micro-battalion that affects the growth, development, aging, drought resistance, disease resistance, and many other aspects for rice. The effects of Se and Zn fertilization on Se and Zn concentrations were evaluated including the response of superoxide dismutase (SOD), catalase (CAT) enzymes activity, and grain yield under single Se, Zn, and combined Se-Zn application using R725 rice variety in pot experiment with 8 treatments (0, Zn5, Zn10, Zn15, Se1, Zn5 + Se1, Zn10 + Se1, and Zn15 + Se1) mg/kg of soil and three replications. Moreover, germination% and seedling growth of resulted seeds from this experiment were evaluated for the agronomical benefit of farmers. The results revealed that Se and Zn had a cumulative effect on each other, but more Se increase was activated than Zn under the combined Se-Zn application. Zinc application had the small effect on Zn concentration in the different fractions but the positive effect on carotenoids and the yield (both applied alone and in combination with Se). Single Se application resulted in a positive effect on Zn accumulation in grain and husk with the high effectiveness of Se accumulation and loss during processing. Combined Se-Zn application had positive effect on carotenoids, CAT, grain yield, and total dry matter. Moreover, single Zn and combined Se-Zn application had a positive effect on germination% and seedling growth. Agronomic biofortification with combined Se-Zn supply provided both agronomic and nutritional benefits for rice in the current pot trail. However, as Se preferably accumulated in the edible part as compared to Zn, 1 mg Se/kg fertilization was unsafe for edible purposes according to the national standard of China (0.04-0.3 mg/kg) but could be recommended as medicine.
硒（Se）是一种必需的微量元素，也是氧化酶的重要组成部分，可保护细胞膜，消除人体内自由基的作用。硒是低硒水稻基因型和缺硒地区所必需的。锌（Zn）是一种微营养素，影响水稻的生长、发育、衰老、抗旱、抗病等诸多方面。本研究采用盆栽试验，以 R725 水稻品种为供试材料，在土壤中分别施 0、Zn5、Zn10、Zn15、Se1、Zn5+Se1、Zn10+Se1、Zn15+Se1mg/kg 处理，研究了单施 Se、Zn 以及 Se-Zn 配施对超氧化物歧化酶（SOD）、过氧化氢酶（CAT）活性和籽粒产量的影响，并对其进行了分析。此外，还评估了来自该实验的种子的发芽率和幼苗生长情况，以评估其对农民的农业效益。结果表明，Se 和 Zn 对彼此有累积效应，但在 Se-Zn 配施下，Se 的增加比 Zn 更为活跃。Zn 处理对不同形态 Zn 浓度的影响较小，但对类胡萝卜素和产量（单独或与 Se 结合施用）有积极影响。单施 Se 对籽粒和稃壳中 Zn 积累有积极影响，且 Se 积累和加工过程中的损失效率高。Se-Zn 配施对类胡萝卜素、CAT、籽粒产量和总干物质有积极影响。此外，单 Zn 和 Se-Zn 配施对发芽率和幼苗生长有积极影响。在当前的盆栽试验中，采用 Se-Zn 联合供应进行农业生物强化，为水稻提供了农业和营养方面的效益。然而，由于 Se 比 Zn 更倾向于在可食用部分积累，根据中国国家标准（0.04-0.3mg/kg），1mg/kg 的 Se 施肥量对食用不安全，但可作为药物推荐。
