Fig. 7.

Schematic representation of target sites of toxins produced by A. alternata. The putative target site of ACT-toxins in tangerine is the plasma membrane. After the infection of citrus leaves, induction of fast lipid peroxidation and accumulation of hydrogen peroxide (H₂O₂) occurs, resulting in cell death. The target of ACR-toxin is the mitochondrion, which after contact with the host plant causes a rapid increase in electrolyte leakage and consequent cell death. Ch, chloroplast; ER, endoplasmic reticulum; Gl, Golgi apparatus; Mt, mitochondrion; Nu, nucleus; Pm, plasma membrane; Va, vacuole.