Organochemicals Division, National Institute for Agro-Environmental Sciences, Tsukuba, Ibaraki 305-8604, Japan.
Environ Toxicol Chem. 2010 Oct;29(10):2269-77. doi: 10.1002/etc.288.
The uptake ability of hydrophobic organic chemicals by plants and the nature of xylem sap of the plants were studied. The plants were grown in soil contaminated with dieldrin. High amounts of dieldrin were detected in the shoots of Cucurbita pepo and Cucumis sativus, but little was seen in the shoots of Brassica oleracea var. italica, Solanum lycopersicum, Glycine max, Zea mays, and Helianthus annuus. The xylem saps of C. pepo and C. sativus leached dieldrin adsorbed on C8 granules, but those of the other plants did not. The xylem saps of C. pepo and C. sativus eluted high amounts of dieldrin from the size-exclusion chromatography column near the fractions of RNase A (13.7 kDa) after Aprotinin (6.5 kDa), which has a larger molecular weight than dieldrin (381). The enhancement of dieldrin solubility by xylem sap was reduced by proteinase and heating. It was suspected that the protein-like materials in the xylem sap delivered dieldrin from the roots to the shoots.
研究了植物对疏水性有机化学物质的吸收能力和植物木质部汁液的性质。这些植物生长在被狄氏剂污染的土壤中。在南瓜和黄瓜的地上部分检测到大量的狄氏剂，但在青花菜、番茄、大豆、玉米和向日葵的地上部分中则很少见。南瓜和黄瓜的木质部汁液可以沥滤出吸附在 C8 颗粒上的狄氏剂，但其他植物的木质部汁液则不能。南瓜和黄瓜的木质部汁液在 Aprotinin（分子量为 6.5 kDa）之后，靠近 RNase A（分子量为 13.7 kDa）的洗脱分数附近，从排阻层析柱中洗脱了大量的狄氏剂。木质部汁液增加狄氏剂溶解度的作用可被蛋白酶和加热所削弱。木质部汁液中的类蛋白物质可能将狄氏剂从根部输送到地上部分。
