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首页> 外文期刊>Plant and Soil >Factors affecting the phytoaccumulation of weathered, soil-borne organic contaminants: analyses at the ex planta and in planta sides of the plant root.
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Factors affecting the phytoaccumulation of weathered, soil-borne organic contaminants: analyses at the ex planta and in planta sides of the plant root.

机译：影响风化的土壤传播的有机污染物植物积累的因素：植物前根和植物根侧的分析。

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Persistent Organic Pollutants (POPs) in the soil-plant system were tracked from their origin in the bulk soil, into the rhizosphere soil pore water, to the xylem sap, and up to the aerial plant tissue. Specifically, the profiles of both chiral and achiral components of technical chlordane along this continuum were examined in detail for members of the Cucurbitaceae family: Cucurbita pepo L. subsp. pepo ("Black Beauty" true zucchini), Cucurbita pepo L. intersubspecific cross ("Zephyr" summer squash), and Cucumis sativus ("Marketmore" cucumber). The experiments were based on the use of mini-rhizotrons for collection and analysis of rhizosphere soil pore water for organic pollutants, as well as for low molecular weight organic acids (LMWOAs). In addition, the xylem sap and aerial plant tissue for intact, homografted, and heterografted C. pepo "Black Beauty" and C. sativus "Marketmore" plants were compared. The data indicate that profiles of the chlordane components in the pore water show no alteration in chiral patterns from those in the bulk soil and may be interpreted by physicochemical partitioning coefficients. Low molecular weight organic acids (LMWOAs) in the rhizosphere were observed to have a minor impact on bioavailability of the pollutants. However, once the pollutants cross the root membrane, major distinctive uptake and enantioselective patterns are apparent in the xylem sap, which are maintained in the aerial tissue. These in planta patterns are based on plant genotype. Specifically, grafting experiments with compatible heterografts of C. pepo and C. sativus establish that the chiral patterns are fully dependent on the plant root. The genotypic dependence of the data suggests possible mechanisms for phytoaccumulation..
机译：从土壤-植物系统中的持久性有机污染物（POPs）出发，从其起源于散装土壤，根际土壤孔隙水，木质部树液直至空中植物组织。具体而言，详细检查了葫芦科的成员：沿途这个过程中工业用氯丹的手性和非手性成分的分布：葫芦科亚种。 pepo（“ Black Beauty”真正的西葫芦），西葫芦pepo L.亚种间杂交（“ Zephyr”西葫芦）和Cucumis sativus（“ Marketmore”黄瓜）。实验是基于使用微型根际蓄热器来收集和分析根际土壤孔隙水中的有机污染物以及低分子量有机酸（LMWOA）。此外，比较了完整，同种和异种C. pepo“ Black Beauty”和C. sativus“ Marketmore”植物的木质部汁液和气生植物组织。数据表明，孔隙水中氯丹成分的分布图与散装土壤中的氯丹成分没有显示出手性模式的变化，并且可以通过理化分配系数来解释。根际中的低分子量有机酸（LMWOA）对污染物的生物利用度影响较小。但是，一旦污染物穿过根膜，木质部树液中就会出现明显的主要吸收和对映选择性模式，而这些部分在气生组织中得以维持。这些植物模式基于植物基因型。具体而言，使用C. pepo和C. sativus相容异种移植物进行的嫁接实验确定，手性模式完全取决于植物根。数据的基因型依赖性提示了植物积累的可能机制。

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