Fig. 2.3 Metabolism of environmental contaminants by hairy root cells
(a) a cartoon depiction of a hairy root cell expressing contaminant metabolizing enzymes (white
chevron and black pie) at basal levels; (b) environmental contaminants (red diamonds) may
promote the production of reactive oxygen species (yellow pentagon), the enhanced production
of ROS scavenging enzymes and antioxidants (white chevron), and/or contaminant metabolizing
enzymes (black pie); (c) the expression of transgenes of animal or plant origin may also result in the
enhanced production of contaminant metabolizing enzymes (blue chevron and orange pie) and
phytoremediation capacity of plants (Suza et al. 2008)