近日,，環(huán)境科學(xué)類主流刊物Environmental Science & Technology以新聞的形式公布了中國科學(xué)院生態(tài)環(huán)境研究中心研究員朱永官及其合作者的最新研究成果,，該項研究通過野外調(diào)查和模擬試驗證實：在砷污染條件下，水稻籽粒中硒和鋅的含量明顯降低,。
據(jù)介紹,，砷是一個強致癌物質(zhì)，該小組前期的研究已經(jīng)表明對于以大米為主食的人群來講,，水稻砷污染是人體暴露砷的重要途徑,。而硒和鋅作為人體抗氧化系統(tǒng)的必須微量元素，在降低砷污染的健康效應(yīng)具有潛在的作用,。令人遺憾的是,，砷污染似乎是一個雪上加霜的問題，因為砷在水稻體內(nèi)的積累不僅直接影響人體健康,，還可以通過降低一些人體必須的微量元素含量給人體健康帶來間接的影響,。不過情況并不是都很糟，朱永官研究員參與的另一項研究發(fā)現(xiàn)：通過培育低砷水稻品種,，人類有可能有效降低砷污染帶來的健康風(fēng)險,。但是，該成果表明：由于基因與環(huán)境的互作,，人們又必要針對不同的土壤和氣候特征培育不同的水稻品種,，以滿足不同地區(qū)應(yīng)對砷污染的需要。Environmental Science & Technology網(wǎng)站也進行在線發(fā)表,。（生物谷Bioon.com）
生物谷推薦原始出處：
Environ. Sci. Technol., 2009, 43 (10), pp 3556–3560 DOI: 10.1021/es803368y
Uptake and Acropetal Translocation of Polycyclic Aromatic Hydrocarbons by Wheat (Triticum aestivum L.) Grown in Field-Contaminated Soil
Yuqiang Tao, Shuzhen Zhang*, Yong-guan Zhu and Peter Christie
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China, and Agri-Environment Branch, Agriculture Food and Environmental Science Division, Agri-Food and Biosciences Institute, Queen’s University of Belfast, Newforge Lane, Belfast BT9 5PX, U.K.
Uptake and acropetal translocation of 14 priority polycyclic aromatic hydrocarbons (PAHs) by wheat (Triticum aestivum L.) grown in 15 field-contaminated soils were investigated in a growth chamber. PAH concentrations in roots correlated positively with the corresponding concentrations in soils and negatively with the contents of soil organic carbon (p < 0.01). No clear linear relationship was found between log RCF (root concentration factor, μg g?1root/μg g?1soil on dry weight basis) and log Kow of these PAHs. Four-ring PAHs had the highest tendency to be taken up by roots. PAH concentrations in shoots correlated well with their concentrations in soils and roots. Furthermore, distribution profiles of PAHs in shoots were fairly similar to those in soils. Acropetal translocation of 10 PAHs (with log Kow varying from 3.45 to 5.78) was also implicated by Rt (ratio of PAH from root-to-shoot translocation to the total accumulation in shoots) ranging from 53.6 to 72.6%. A negative linear relationship was found between log Rt and log Kow of these PAHs (p < 0.01), and acropetal translocation of PAHs depended on their chemical properties.
