水稻对土壤中DDT及其系列降解物的吸收
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国家重点基础研究发展规划项目(2002CB410805)资助


UPTAKE OF AGED RESIDUAL AND CURRENT-APPLIED DDT AND ITS METABOLITES, DDD, DDMS AND DDMU BY PADDY RICE(ORYZA SATIVA)
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    摘要:

    在温室条件下,盆栽种植水稻(Oryza sativa,淹水土壤),设老化态DDT残留和新施入DDT两种处理,生长期126 d。研究结果显示:老化残留DDT在土壤中降解十分缓慢,而新施入DDT在土壤中降解相当迅速,GC/MS鉴定结果表明,降解物除DDD外,还有DDMS和DDMU。尽管土壤中老化残留的降解受到明显抑制,但水稻根系仍可吸收利用并向地上组织传输,因此不可低估老化残留的生物有效性。在新施入DDT的处理中,水稻根系对DDD的吸收量高达900 ng g-1,不过,根系向地上部组织传输DDX的能力极为有限。值得注意的是:水稻根系对土壤中DDMS和DDMU吸收的生物富集因子为DDD或DDE的3倍,表明DDMU和DDMS具有较母体化合物更为突出的作物可吸收利用性。DDX各组分从水稻根系向地上组织传输时,其分布状况发生了明显的变化,引起这种变化的主要原因是作物在吸收和传输DDX时具有一定的选择性,或者DDX在这种吸收和传输过程中发生了进一步的降解。

    Abstract:

    Uptake of aged and current residual p,p'-DDT and its metabo lites DDD,DDE,DDMU and DDMS (DDX for short) in soil by paddy rice (Oryza sativa) was researched with pot expermients in greenhouse.The total growth period of rice was 126 days.Resu lts reveal that recently applied DDT degraded much faster than aged DDT residues in paddy soil and its dominating metabolite formed was DDD.Subordinate metabolites DDMS and DDMU were identified by GC/MS.Paddyrice could absorb both forms,the aged and current DDX residues from soil,and tran sport them to aerial compartments; so that the bioavailability of lower leveled aged DDX shouldnt be underestimate.Despite a high concentration of DDD (900 ng g-1) absorbed by paddy roots in soil treated with DDT recently,the tran smission of DDX from root to edible part of the plant was limited.Concentration of DDX in roots is not a good indicator of the status of DDX in brown rice.It was worthy noting that the root concentration factors (RCFs) for DDMS or DDMU were about 3 times as high as for DDD or DDE.The data illuminated more prominent bioava ilability of DDMS and DDMU than their maternal compounds.Regardless of the contents and forms of DDX residues in soil,similar contents of DDX were observed in brown rice from different treatments.Distribution of DDX changed obviously with DDX transporting to edible part from root.The reasons are: first,motilities of DDT and its metab olites from root to aerial are different,and second,farther degradation of DDX would occur in rice plant.

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安琼,董元华,王辉,魏峰.水稻对土壤中DDT及其系列降解物的吸收[J].土壤学报,2008,45(4):686-692. DOI:trxb10.11766/200701250411 An Qiong, Dong Yuanhua, Wang Hui, Wei Feng. UPTAKE OF AGED RESIDUAL AND CURRENT-APPLIED DDT AND ITS METABOLITES, DDD, DDMS AND DDMU BY PADDY RICE(ORYZA SATIVA)[J]. Acta Pedologica Sinica,2008,45(4):686-692.

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  • 收稿日期:2007-01-25
  • 最后修改日期:2007-04-11
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  • 在线发布日期: 2013-05-10
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