Compounds that affect host reaction

Compounds that affect Host Reactions. Examples of compounds which enhance or induce host reactions to pathogens include 2,2-dichloro-3,3-dimethyl-cyclopropane carboxylic acid (DDCC), probenazole, and fosetyl-Al (4). Although these chemicals do not stop the fungus from penetrating the plant, they are quite effective at preventing colonization through the enhancement of the host s resistance mechanisms. Further studies are needed to elucidate how these resistance mechanisms are triggered. 

The crystal defects of the host lattice structure aid in the incorporation of chromophores. By increasing those defects, reactants can diffuse more easily through the product layers and the pigment is formed faster. The presence of mineralizers can also positively affect the solid-state reaction (24). A mineralizer is a compound that facilitates crystal growth during solid-state reactions by providing a local environment that makes the movement of reactants through the solids mixture easier. The incorporation of the chromophore into the host lattice usually results in the formation of a substitution, or less often an addition compound. 

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