The chemical composition of EO from lemon grass plants was
altered as the Pb levels increased. Without Pb and AMF inoculation,
the major component of EO was citral, with contents ranging from
45.08 to trace (Table 2). However, under Pb additions in the soil, and
withor withoutAMF,themajor component of EO was geranial, with
contents ranging from 1.6 to 62.95% (Table 2). This suggests that
the plants manifested defense mechanisms, such as the increased
production of secondary metabolites; in this case, geranial.