Cadmium accumulation in different rice cultivars and screening for pollution-safe cultivars of rice
Cadmium accumulation in different rice cultivars and screening for pollution-safe cultivars of rice
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DOI：
10.1016/j.scitotenv.2006.06.013
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发表时间：
2006-11-01
影响因子：
9.8
通讯作者：
Yang, Zhongyi
中科院分区：
文献类型：
--
作者：
Yu, Hui;Wang, Junli;Yang, Zhongyi
由于对粮食的需求很大，一些国家将大面积的受污染土地用于农业生产。为了最大限度地减少污染物通过食用农产品流入人类食物链，我们提出了污染安全品种（PSC）的概念，即即使在受污染的土壤中生长，其可食用部分积累的特定污染物也足以安全食用。我们通过种植43个水稻品种（Oryza sativa L.，包括20个正常品种和23个杂交品种）在高（75.69-77.55 mg kg（-1））和低（1.75-1.85 mg kg（-1））镉（Cd）暴露条件下的生长。这些盆栽实验发生在2004年春季和夏季。在低浓度Cd胁迫下，43个供试品种中有30个表现为Cd-PSC。两个实验之间的籽粒Cd浓度高度相关（p < 0.01），这表明水稻籽粒中Cd的积累是基因型依赖性的，选择PSC是可能的，至少在一定水平的土壤污染。在高浓度镉暴露下，未发现Cd-PSC。产量提高，在一些品种和抑郁症在其他土壤镉含量升高的反应，这表明，不能依赖于产量抑郁症作为一个指标的毒性的谷物。因此，筛选PSC并建立PSC育种计划以有效和高效地降低人类通过作物消费暴露于土壤污染物（如Cd）的风险是重要和可行的。(c)2006 Elsevier B. V.保留所有权利。
Large areas of contaminated land are being used for agricultural production in some countries due to the high demand for food. To minimize the influx of pollutants to the human food chain through consumption of agricultural products, we propose the concept of pollution-safe cultivars (PSCs), i.e. cultivars whose edible parts accumulate a specific pollutant at a level low enough for safe consumption, even when grown in contaminated soil. We tested the feasibility of the PSC concept by growing 43 cultivars of paddy rice (Oryza sativa L., including 20 normal and 23 hybrid cultivars) under a high (75.69-77.55 mg kg(-1)) and a low (1.75-1.85 mg kg(-1)) cadmium (Cd) exposure. These pot experiments took place in the spring and summer of 2004. At the low level of Cd exposure, 30 out of the 43 tested cultivars; were found to be Cd-PSCs. Grain Cd concentrations were highly correlated (p < 0.01) between the two experiments, suggesting that Cd accumulation in rice grain is genotype-dependent and that the selection of PSCs is possible, at least at a certain level of soil contamination. No Cd-PSCs were found under the high level of Cd exposure. Yield was enhanced in some cultivars and depressed in others in response to elevated soil Cd, indicating that fanners; cannot rely on yield depression as an indicator of toxicity of the grains. It is therefore important and feasible to screen for PSCs and to establish PSC breeding programs to effectively and efficiently reduce the risk of human exposure to soil pollutants, such as Cd, through crop consumption. (c) 2006 Elsevier B.V. All rights reserved.