Dipartimento di Agraria, Università degli Studi di Sassari, Via E. De Nicola, 1, 07100 Sassari, Italy.
Dipartimento di Chimica e Farmacia, Università degli Studi di Sassari, Via Vienna, 2, 07100 Sassari, Italy.
Molecules. 2020 Apr 17;25(8):1861. doi: 10.3390/molecules25081861.
The amount of specific trace elements like selenium (Se) may be of health concern for humans if contained in too high (or low) quantities in staple foods like rice. Among the attempts aimed to optimize the Se concentration in rice, only few studies have been focused on the use of irrigation methods other than continuous flooding. Since intermittent irriguous methods, like sprinkler and saturation, have found to be effective in modifying the bioaccumulation of arsenic and cadmium in rice kernels, the main goal of this study is to measure the amount of the total Se contained in grains of 26 rice genotypes cultivated for two consecutive agrarian vintages in the same open field and with the same water, but differently irrigated with continuous flooding, sprinkler or saturation. To do this, an original and validated ICP-MS method has been developed. The validation parameters accounted for a high sensitivity and accuracy. Sprinkler irrigation is able to reduce in the average of 90% the amount of total Se in kernels in comparison to values measured in rice irrigated with continuous flooding. In conclusion, different irrigation techniques and rice genotypes seem to be valuable tools in order to allow in the future the customized modulation of the Se concentration in rice grain according to the needs of the various populations.
如果主食（如大米）中特定微量元素（如硒）的含量过高（或过低），可能会对人类健康产生影响。在旨在优化大米中硒浓度的尝试中，只有少数研究关注除连续灌溉以外的灌溉方法。由于间歇灌溉方法，如喷灌和饱和灌溉，已被证明可以有效改变砷和镉在水稻籽粒中的生物累积，本研究的主要目的是测量在同一开阔地连续两个农业季节种植的 26 个水稻基因型的籽粒中总硒的含量，使用相同的水，但采用连续灌溉、喷灌或饱和灌溉进行不同的灌溉。为此，开发了一种原始且经过验证的 ICP-MS 方法。验证参数表明该方法具有较高的灵敏度和准确性。与连续灌溉条件下种植的水稻相比，喷灌平均可使籽粒中的总硒含量降低 90%。总之，不同的灌溉技术和水稻基因型似乎是有价值的工具，以便在未来能够根据不同人群的需求，对水稻籽粒中的硒浓度进行定制调节。
