CAS Key Laboratory of Soil Environment and Pollution Remediation , Institute of Soil Science, Chinese Academy of Sciences , Nanjing 210008 , China.
University of Chinese Academy of Sciences , Beijing 100049 , China.
J Agric Food Chem. 2018 Nov 28;66(47):12490-12497. doi: 10.1021/acs.jafc.8b04502. Epub 2018 Nov 15.
The application of selenite to soil has increasingly been used to produce Se-enriched food. This study investigated the biofortification characteristics of Se in rice after application of selenite to soil at different growth stages. The results showed that the application of Se during booting stage resulted in the highest concentration of Se in brown rice due to the highest upward translocation of Se. More than 90% of Se in the brown rice was organic species, with selenomethionine predominated. The proportion of selenomethionine in the brown rice decreased with the delay in application time. The rice grown in the acidic soil had higher Se concentrations than in the neutral soil. With increasing soil Cd level, Se accumulation and the proportion of Se-methylselenocysteine in the brown rice were reduced. This study provides a theoretical basis for the production of Se-enriched rice in clean soil or slightly to moderately Cd-contaminated soil.
亚硒酸盐在土壤中的应用越来越多地被用于生产富硒食品。本研究调查了在不同生长阶段向土壤中施用亚硒酸盐后水稻中硒的生物强化特征。结果表明，由于硒的向上转运最高，在抽穗期施用硒会导致糙米中硒的浓度最高。糙米中超过 90%的硒为有机形态，以硒代蛋氨酸为主。随着施硒时间的延迟，糙米中硒代蛋氨酸的比例降低。在酸性土壤中生长的水稻比在中性土壤中生长的水稻硒浓度更高。随着土壤 Cd 水平的升高，糙米中硒的积累和硒-甲基硒代半胱氨酸的比例降低。本研究为在清洁土壤或轻度至中度 Cd 污染土壤中生产富硒大米提供了理论依据。
