Roots of J1 somatic embryos transformed with the Pv010 gene. (A) nematode-resistant roots of line 68-3-1. Roots showed no visible symptoms of nematode damage. (B) nematode-damaged roots of line 66-1-2. Roots were damaged by nematodes after two months of infection. (C) Single-vector transformed line 29-3-1 with no visible damage. (D) Untransformed J1 roots with nematode damage.