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Sivaram, A.K., P. Logeshwaran, R. Lockington, R. Naidu, and M. Megharaj.
Chemosphere 193:625-634(2018)

A glasshouse experiment was conducted to investigate the phytoremediation potential of 14 different plant species belonging to C3 and C4 carbon fixation pathways for soils spiked with PAHs, such as benzo[a]pyrene (B[a]P) and pyrene (PYR). The investigators measured the changes in morphological, physiological, and biochemical parameters and the bioaccumulation and biodegradation ability of the plants in soils spiked with 48 and 194 mg/kg of B[a]P and PYR, respectively. The percent removal efficacy of B[a]P and PYR by the tested plant species over a period of 50 d ranged from 6-26% and 14-40%, respectively. Sudan grass (C4), vetiver (C4), maize (C4), and sunflower (C3) achieved the maximum removal of both B[a]P and PYR. Accumulated root and shoot concentration of PYR was higher in both C3 and C4 plant species compared to B[a]P. Overall results indicated that C4 plants were more efficient than their C3 counterparts in terms of PAH degradation ability.

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