Uptake and translocation of Cd in different rice cultivars and the relation with Cd accumulation in rice grain
Uptake and translocation of Cd in different rice cultivars and the relation with Cd accumulation in rice grain
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DOI：
10.1016/j.jhazmat.2006.09.057
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发表时间：
2007-05-08
影响因子：
13.6
通讯作者：
Zhu, Qingsen
中科院分区：
文献类型：
--
作者：
Liu, Jianguo;Min, Qian;Zhu, Qingsen
采用盆栽试验研究了6个水稻品种对镉的吸收和转运特性。结果表明，水稻吸收的镉只有很小一部分（0.73%）转移到籽粒中。植株对Cd的总吸收量、根、茎、叶中Cd的含量和累积量，品种间差异均小于1倍。而籽粒中Cd含量和累积量的差异分别在5倍和8倍以上。Cd在植株各器官中的分配比例，品种间差异也是根、茎、叶较小，籽粒较大。籽粒Cd含量与植株Cd积累量、Cd在地上部的分配率，尤其是地上部Cd在籽粒中的分配率呈极显著正相关（P <0.01）。结果表明，水稻籽粒中Cd的含量在一定程度上受植株对Cd的吸收和Cd从根向地上部的转运所控制，但在很大程度上受Cd从地上部向籽粒的转运所控制。镉在稻米加工后的不同产品中分布不均匀。皮层（胚）中镉的平均浓度是谷壳和精米中的5倍。镉在产品中的累积量，皮层（胚）平均约占40%，精米平均约占45%，谷壳平均约占15%。(C)2006 Elsevier B. V.保留所有权利。
The variations among six rice cultivars in cadmium (Cd) uptake and translocation were investigated with pot soil experiments. The results showed that only a very small portion (0.73%) of Cd absorbed by rice plant was transferred into grain. With regard to plant total Cd uptake, Cd concentrations and quantity accumulations in roots, stems and leaves, the differences among the cultivars (between the largest one and the smallest one) were less than one time. But for Cd concentrations and Cd quantity accumulations in the grains, the differences were more than five and eight times, respectively. With respect to Cd distribution portions in plant organs, the diversities among the cultivars were also small in roots, stems and leaves, but much larger in grains. Grain Cd concentrations correlated positively and significantly (P < 0.0 1) with Cd quantity accumulations in plant, Cd distribution ratios to aboveground parts, and especially with Cd distribution ratios from aboveground parts to the grain. The results indicated that Cd concentration in rice grain was governed somewhat by plant Cd uptake and the transport of Cd from root to shoot, and in a greater extent, by the transport of Cd from shoot to grain. Cd was not distributed evenly in different products after rice grain processing. The average Cd concentration in cortex (embryo) was five times more than that in chaff and polished rice. With regard to Cd quantity accumulation in the products, near 40% in cortex (embryo), 45% in polished rice and 15% in chaff averagely. (C) 2006 Elsevier B.V. All rights reserved.