Accumulation of arsenic and its distribution in rice plant (Oryza sativa L.) in Gangetic West Bengal, India
Accumulation of arsenic and its distribution in rice plant (Oryza sativa L.) in Gangetic West Bengal, India
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DOI：
10.1007/s10333-009-0180-z
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发表时间：
2010-03-01
影响因子：
2.2
通讯作者：
Santra, S. C.
中科院分区：
文献类型：
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作者：
Bhattacharya, P.;Samal, A. C.;Santra, S. C.
对灌溉水和稻田土壤中砷的存在进行了调查，以评估砷的积累及其在西孟加拉邦砷影响地区水稻植株各部分（根、秸秆、稻壳和谷物）中的分布。结果表明，灌溉水中的砷含量为0.05～0.70 mg·l(-1)，远高于世界卫生组织推荐的饮用水砷限量0.01 mg·l(-1)。稻田土壤受到灌溉水的污染，从而增强了水稻中砷的生物积累。土壤总砷浓度范围为1.34～14.09 mg·kg(-1)。土壤有机碳与水稻砷积累呈正相关，而土壤pH则呈强负相关。与秸秆（1.18 +/- A 0.002-2.13 +/- A 0.009 mg kg(-1)）、壳（0.40 +/- A 0.004-1.05 +/- A）相比，根部（6.92 +/- A 0.241-28.63 +/- A 0.225 mg kg(-1)）砷积累量更高0.006 mg kg(-1)) 和水稻籽粒 (0.16 +/- A 0.001-0.58 +/- A 0.003 mg kg(-1)) 部分。然而，所有研究样品的米粒中砷的累积量均在0.16+/-A 0.001至0.58+/-A 0.003 mg kg(-1)干重砷之间，没有超过大米的允许限量（根据世界卫生组织的建议为1.0 mg kg(-1)）。选择了两种水稻品种，一种是高产品种（Red Minikit），另一种是本地品种（Megi），用于砷易位研究。与当地水稻品种（0.099-0.161）相比，高产品种（0.194-0.393）的砷易位较高。与从根到地上部的砷转运 (0.040-0.108) 相比，两种水稻品种中砷从地上部到谷粒的转运效率 (0.099-0.393) 均明显较高。
The presence of arsenic in irrigation water and in paddy field soil were investigated to assess the accumulation of arsenic and its distribution in the various parts (root, straw, husk, and grain) of rice plant from an arsenic effected area of West Bengal. Results showed that the level of arsenic in irrigation water (0.05-0.70 mg l(-1)) was much above the WHO recommended arsenic limit of 0.01 mg l(-1) for drinking water. The paddy soil gets contaminated from the irrigation water and thus enhancing the bioaccumulation of arsenic in rice plants. The total soil arsenic concentrations ranged from 1.34 to 14.09 mg kg(-1). Soil organic carbon showed positive correlation with arsenic accumulation in rice plant, while soil pH showed strong negative correlation. Higher accumulation of arsenic was noticed in the root (6.92 +/- A 0.241-28.63 +/- A 0.225 mg kg(-1)) as compared to the straw (1.18 +/- A 0.002-2.13 +/- A 0.009 mg kg(-1)), husk (0.40 +/- A 0.004-1.05 +/- A 0.006 mg kg(-1)), and grain (0.16 +/- A 0.001-0.58 +/- A 0.003 mg kg(-1)) parts of the rice plant. However, the accumulation of arsenic in the rice grain of all the studied samples was found to be between 0.16 +/- A 0.001 and 0.58 +/- A 0.003 mg kg(-1) dry weights of arsenic, which did not exceed the permissible limit in rice (1.0 mg kg(-1) according to WHO recommendation). Two rice plant varieties, one high yielding (Red Minikit) and another local (Megi) had been chosen for the study of arsenic translocation. Higher translocation of arsenic was seen in the high yielding variety (0.194-0.393) compared to that by the local rice variety (0.099-0.161). An appreciable high efficiency in translocation of arsenic from shoot to grain (0.099-0.393) was observed in both the rice varieties compared to the translocation from root to shoot (0.040-0.108).