Abstract: The effect of inoculation with arbuscular mycorrhiza (AM) fungi
(Acaulospora lavis) on the degradation of di (2-ethylhexyl) phthalate (DEHP) in
soil was studies. Cowpea plants (Pigna sinensis) were used as host plants and
grown in a specially designed rhizobox. The experimental results indicated
that, both in sterile and non-sterile soil, mycorrhizal colonization rates were
much higher in the mycorrhizal plants than in the non-mycorrhizal plants.
Addition of 4 mg/kg DEHP slightly affected mycorrhizal colonization, but the
addition of 100 mg/kg DEHP significantly decreased mycorrhizal colonization.
DEHP degradation in the mycorrhizosphere (Ms) and hyphosphere (Hs), especially
in the Hs, increased after inoculation with Acaulospora lavis. It is concluded
that mycorrhizal hyphae play an important role in the plant uptake, degradation
and translocation of DEHP. The mechanism might be attributed to increased
numbers of bacteria and actinomycetes and activity of dehydrogenase, urease and
acid phosphatase in the Ms and Hs by mycorrhizal fungi.
Keywords: AM fungi, inoculation, DEHP, concentration, degradation