Williams Paul N, Islam Shofiqul, Islam Rafiqul, Jahiruddin M, Adomako Eureka, Soliaman A R M, Rahman G K M M, Lu Ying, Deacon Claire, Zhu Yong-Guan, Meharg Andrew A
Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Environ Sci Technol. 2009 Nov 1;43(21):8430-6. doi: 10.1021/es901825t.
A reconnaissance of 23 paddy fields, from three Bangladesh districts, encompassing a total of 230 soil and rice plant samples was conducted to identify the extent to which trace element characteristics in soils and irrigation waters are reflected by the harvested rice crop. Field sites were located on two soil physiographic units with distinctly different As soil baseline and groundwater concentrations. For arsenic (As), both straw and grain trends closely fitted patterns observed for the soils and water. Grain concentration characteristics for selenium (Se), zinc (Zn), and nickel (Ni), however, were markedly different. Regressions of shoot and grain As against grain Se, Zn, and Ni were highly significant (P < 0.001), exhibiting a pronounced decline in grain trace-nutrient quality with increasing As content. To validate this further, a pot experiment cultivar screening trial, involving commonly cultivated high yielding variety (HYV) rice grown alongside two U.S. rice varieties characterized as being As tolerant and susceptible, was conducted on an As-amended uniform soil. Findings from the trial confirmed that As perturbed grain metal(loid) balances, resulting in severe yield reductions in addition to constraining the levels of Se, Zn, and Ni in the grain.
对来自孟加拉国三个地区的23块稻田进行了勘查，共采集了230个土壤和水稻植株样本，以确定收获的水稻作物对土壤和灌溉水中微量元素特征的反映程度。田间地点位于两个土壤地貌单元，其砷的土壤基线和地下水浓度明显不同。对于砷（As），稻草和谷粒的趋势与土壤和水中观察到的模式密切吻合。然而，硒（Se）、锌（Zn）和镍（Ni）的谷粒浓度特征明显不同。地上部分和谷粒中的砷与谷粒中的硒、锌和镍的回归高度显著（P < 0.001），随着砷含量的增加，谷粒微量营养品质明显下降。为了进一步验证这一点，在添加了砷的均匀土壤上进行了盆栽试验品种筛选试验，试验涉及与两个分别被表征为耐砷和对砷敏感的美国水稻品种一起种植的常见高产杂交水稻品种（HYV）。试验结果证实，砷扰乱了谷粒中金属（类金属）平衡，除了限制谷粒中硒、锌和镍的含量外，还导致产量大幅下降。
