The phytoremediation potential of 14 different plant species belonging to C3 and C4 carbon fixation pathway for soils spiked with polycyclic aromatic hydrocarbons (PAHs) such as benzo[a]pyrene (B[a]P) and pyrene (PYR) was investigated. A glasshouse experiment was conducted to measure 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⁻¹ of B[a]P and PYR, respectively. The per cent removal efficacy of B[a]P and PYR by the tested plant species over a period of 50 days was from 6 to 26% and 14–40% respectively. The maximum removal of both B[a]P and PYR was observed in Sudan grass (C4), vetiver (C4), maize (C4), and sunflower (C3). In terms of accumulation in root and shoot, the concentration of PYR was higher in both C3 and C4 plant species when compared to B[a]P. Overall the results indicated that C4 plants were more efficient than their C3 counterparts in terms of morphological, physiological, biochemical and degradation ability of PAHs.

研究了14种不同的植物修复潜力，这些植物属于C3和C4碳固定路径，对土壤中掺有多环芳烃（PAH）的苯并[ a ] re（B [ a ] P）和pyr（PYR）具有修复作用。进行了温室试验，以测量分别向掺入48 mg和194 mg kg ^-1的B [ a ] P和PYR的土壤中植物的形态，生理和生化参数的变化以及植物的生物累积和生物降解能力。在50天的时间内，被测植物对B [ a ] P和PYR的去除率分别为6％至26％和14–40％。B [ a在苏丹草（C4），香根草（C4），玉米（C4）和向日葵（C3）中观察到] P和PYR。就根和芽的积累而言，与B [ a ] P相比，C3和C4植物物种中PYR的浓度均更高。总体而言，结果表明，就PAHs的形态，生理，生化和降解能力而言，C4植物比C3植物更有效。