Enzymes
Role of Enzymes and Toxin in Disease Development Enzymes The activities of pathogen in plants are largely chemical in nature. The effects caused by the pathogens on plants are almost entirely the result of biochemical reactions taking place between substances secreted by the pathogens and those present in, or produced by the plants. Among the plant pathogens, all except viruses and viroids are not known to produce any substances themselves, but they induce the host cell to produce either excessive amount of certain substances already found in the healthy host cell or substances completely new to the host. Some of the substances are enzymes, growth regulators and toxins. In general,plant pathogenic enzymes disintegrate the structural components of the host cell, break down in...