Abstract
Phytoremediation has been studied extensively because of its low cost and environmentally friendly features in controlling environmental pollution. Potted plants play an important role in purifying indoor air from benzene pollutants. The plant species with ideal pollutant-removal ability could be applied widely; however this can only be done once the plants are also highly tolerant of the pollutants. This research investigates the physiological and anti-oxidant system adaptations of two benzene-removing plant species ( Cymbidium Golden Elf and Crassula portulacea ) in a prolonged benzene fumigation state. The fumigation lasted for 45 d with three treatments of 0, 150 and 300 ppb of benzene. The measurement of the physiological and anti-oxidant adaptations showed that the two species tolerate benzene well. These adaptations had their own inherent advantages in each species and could prevent damage to the plant from the benzene fumigation. Correlation analysis suggests that catalase in Cymbidium Golden Elf and ascorbic acid (AsA) in Crassula portulacea contribute to the removal of peroxide from the plants. In addition, superoxide dismutase plays an important role in the prevention of membrane lipid peroxidation in both test plants; however, in Crassula portulacea the role of AsA is stronger.
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