National Botanical Research Institute, Council of Scientific and Industrial Research, Lucknow, 226 001, Uttar Pradesh, India.
Protoplasma. 2010 Sep;245(1-4):113-24. doi: 10.1007/s00709-010-0151-7. Epub 2010 May 20.
The exposure of paddy fields to arsenic (As) through groundwater irrigation is a serious concern that may not only lead to As accumulation to unacceptable levels but also interfere with mineral nutrients in rice grains. In the present field study, profiling of the mineral nutrients (iron (Fe), phosphorous, zinc, and selenium (Se)) was done in various rice genotypes with respect to As accumulation. A significant genotypic variation was observed in elemental retention on root Fe plaque and their accumulation in various plant parts including grains, specific As uptake (29-167 mg kg(-1) dw), as well as As transfer factor (4-45%). Grains retained the least level of As (0.7-3%) with inorganic As species being the dominant forms, while organic As species, viz., dimethylarsinic acid and monomethylarsonic acid, were non-detectable. In all tested varieties, the level of Se was low (0.05-0.12 mg kg(-1) dw), whereas that of As was high (0.4-1.68 mg kg(-1) dw), considering their safe/recommended daily intake limits, which may not warrant their human consumption. Hence, their utilization may increase the risk of arsenicosis, when grown in As-contaminated areas.
稻田通过地下水灌溉暴露于砷（As）是一个严重的问题，这不仅可能导致 As 积累到不可接受的水平，还可能干扰稻米中的矿物质营养。在目前的田间研究中，针对 As 积累，对不同水稻基因型的矿物质营养（铁（Fe）、磷、锌和硒（Se））进行了分析。在根 Fe 斑块上的元素保留及其在包括谷物在内的各种植物部位中的积累方面，观察到了显著的基因型变异，具体的 As 吸收量（29-167mgkg(-1)dw）以及 As 转移系数（4-45%）。谷物保留的 As 水平最低（0.7-3%），其中无机 As 形态占主导地位，而有机 As 形态，即二甲基砷酸和一甲基砷酸，则无法检测到。在所有测试的品种中，硒的水平较低（0.05-0.12mgkg(-1)dw），而 As 的水平较高（0.4-1.68mgkg(-1)dw），考虑到它们的安全/推荐日摄入量限制，这可能不适合人类食用。因此，当在受 As 污染的地区种植时，它们的利用可能会增加砷中毒的风险。
