Table 2: Changes to olfactory system that can potentially affect the behavioral orientation of insects to plants.

Genetic changeEffect

Odorant binding-protein conformationDetermines nonpolar compounds carried to dendrite of chemoreceptor
Change in conformation of protein at receptor site on chemoreceptorInfluences sensitivity of cell to particular compound
Alter numbers of receptor sites for particular chemical on chemoreceptorAlter sensitivity of cell to particular compound
Alter second messenger or membrane properties of + or − chemoreceptorAlter sensitivity of + or − cell overall
Alter gene expression pattern of receptor proteins on + and − cellsSwitch effect of stimulation from + to − or vice versa
Alter wiring of sense cells or interneuronsSwitch effect of stimulation from + to − or vice versa
Alter levels of one or more neuromodulators at synapsesAlter weighting of different + and − inputs
Alter sign of synaptic inputs in path to controlling centerAlter weighting of different + and − inputs