Figure 8.

Effects of external peroxidase on haustorium formation by DMBQ and syringic acid. (A) Concentration-dependent haustorium formation rates of DMBQ and syringic acid treatments. S. hermonthica seedlings were exposed to 0.05, 0.1, 1, and 10 μM of DMBQ or syringic acid, and haustorium formation rates were calculated after 24 h. (B,C) Striga seedlings were exposed to a combination of 0.01 U/μl HRP and 0.001% H₂O₂ in the presence of various concentrations of syringic acid (B) or DMBQ (C) and haustorium formation rates were calculated after 24 h. (D) S. hermonthica seedlings were exposed to a high concentration of HRP at 0.1 U/μl and 0.001% H₂O₂, and haustorium formation rates were calculated after 24 h. Error bars indicate SE (n = 3). NT, not tested. Different lower-case letters represent significant differences as detected by a Tukey HSD test (p < 0.05).