Suppression of Haustorium Formation of Peronospora parasitica in Japanese Radish Root Tissues Pretreated with Inhibitors of Calcium Ion Dependent Metabolism

Abstract

Effects of inhibitors of calcium-dependent metabolism on haustorium formation of Peronospora parasitica in Japanese radish root tissues were investigated. When the root tissues were pretreated with chlortetracycline, EGTA and Na₃VO₄, respectively, haustorium formation of the fungus was suppressed. The suppression by chlortetracycline was restored by addition of a calcium ionophore or a protein kinase activator. These results suggested that haustorium formation of P. parasitica might be closely related to calcium-dependent metabolic process in host.