Figure 4

Concentration-dependent uptake of phenanthrene in intact wheat roots with the presence and absence of 2,4-dinitrophenol (1 mM), a common metabolic inhibitor. Phenanthrene concentrations in Hoagland nutrient solutions (pH 5.5) ranged between 0 and 6.74 μM. Data points represent mean and SD values of triplicates. Error bars do not extend outside all data points. fr wt, Fresh weight. DNP, 2,4-dinitrophenol.