Role of Cassiicolin, a Host-selective Toxin, in Pathogenicity of Corynespora Cassiicola, Causal Agent of a Leaf Fall Disease of Hevea

摘要

Histological study confirmed rapid and direct penetration of Corynespora cassiicola (12 h after inoculation) throughout the lower epidermis, observed also in previous work. The fungal colonisation of leaf tissues was intracellular, irrespective of clonal resistance. For the susceptible clone, fungus penetration led to an important collapse of abaxial epidermis and to cell disorganisation in front of the hyphal progression, characterised by nuclear degeneration and absence of starchy grains.