Arsenic Shoot-Grain Relationships in Field Grown Rice Cultivars
Arsenic Shoot-Grain Relationships in Field Grown Rice Cultivars
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DOI：
10.1021/es902992d
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发表时间：
2010-02-15
影响因子：
11.4
通讯作者：
Meharg, Andrew A.
中科院分区：
文献类型：
--
作者：
Norton, Gareth J.;Islam, M. Rafiqul;Meharg, Andrew A.
稻米中砷的积累对人体健康构成威胁。As从地上部转移到籽粒灌浆过程中的机制是未知的，目前在本研究中As形态在地上部和籽粒成熟，并建立了磷（P）和砷，硅（Si）和砷之间的关系，在广泛的品种生长在孟加拉国和中国的砷污染的田间试验。地上部和籽粒形态之间没有相关性，无机形态砷在地上部中占93.0-97.0%，在籽粒中占63.0-83.7%。二甲基胂酸（DMA）在芽中的百分比为1.4%至6.6%，在谷粒中的百分比为14.6%至37.0%;然而，浓度相当，芽中的浓度范围为0.07至0.26 mg kg（-1），谷粒中的浓度范围为0.03至0.25 mg kg（-1）。地上部砷与地上部硅含量呈正相关，地上部硅含量与籽粒砷含量无相关性。地上部磷含量与籽粒砷含量呈显著负相关。这些结果表明，转运到粮食从地上部的As可能是使用P，而不是Si的运输机制。无机As和DMA向籽粒的转运量差异较大。
Arsenic (As) accumulation in rice grains is a risk to human health. The mechanism of transfer of As from the shoot into the grain during grain filling is unknown at present In this study As speciation in the shoot and grains at maturity were examined, and the relationships between phosphorus (P) and As, and silicon (Si) and As were established in a wide range of cultivars grown in As contaminated field trials in Bangladesh and China. No correlations were observed between shoot and grain speciation, with the inorganic form comprising 93.0-97.0% of As in the shoot and 63.0-83.7% in the grains. The percentage of dimethylarsinic acid (DMA) was between 1.4 and 6.6% in the shoot and 14.6 and 37.0% in the grains; however, the concentrations were comparable, ranging from 0.07 to 0.26 mg kg(-1) in the shoots and 0.03 to 0.25 mg kg(-1) in the grains. A positive correlation was observed between shoot As and shoot Si, however, no correlation was observed between shoot Si and grain As. A significant negative correlation was observed between shoot P and grain As concentrations. These results suggest that the translocation of As into the grain from the shoots is potentially using P rather than Si transport mechanisms. The findings also indicate that inorganic As and DMA translocation to the grain differ considerably.