Accumulation of Weathered P,P′-DDE in Xylem Sap Of Grafted Watermelon
Movement of weathered P,P′-dichlorodiphenyldichloroethane (P,P′-DDE) from contaminated soil to the rhizosphere pore water to the xylem sap of grafted watermelon was studied under green house conditions. P,P′-DDE concentrations in pore water and
xylem sap was compared in intact plants, homografted, and compatible heterografts of Cucurbita pepo spp. pepo and Citrullus lanatus plants.An average P,P′-DDE concentrations in pore water of contaminated soil ranged from 0.36 μg/L to 0.55 μg/L and there
were no statistically significant among the cultivars. Conversely, the xylem sap P,P′-DDE concentration of heterografted watermelon having a zucchini rootstock and watermelon scion was 71 μg/L and it was greater than intact watermelon plants (0.49 μg/L) but less than that
of intact plants of zucchini (141 μg/L). Homografting showed no effect on xylem sap P,P′-DDE concentrations of the identical cultivars. The bio-concentration factors (BCFs) which is an average P,P′-DDE concentration in xylem sap over average P,P′-DDE
in pore water were 344, 325, 197, 1.28, and 0.89 for intact plant of zucchini, homografted zucchini, heterografted watermelon, homografted watermelon, and intact plant of watermelon, respectively. Xylem sap p,p′-DDE concentrations of the heterografted watermelon plants were clearly
influenced by plant phylogeny and enhanced by the zucchini rootstock compared to intact watermelon plants.
Keywords: DDE; accumulation; grafted watermelon; rootstock; xylem sap; zucchini
Document Type: Research Article
Affiliations: Sakarya UniversityDepartment of Environmental Engineering, Sakarya, Turkey
Publication date: 01 April 2012
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