Cyanogenic compounds as protecting agents for organisms

Biochemical and physiological arguments and several plant-predator relationships described in the literature are presented in which cyanogenesis plays a role as a protecting process. HCN arising from the cleavage of cyanogenics is regarded to be the most important agent, but also the cyanogenic itself, carbonyls and -cyanoalanine, which are products of degradation processes of cyanogenics, may possess protecting properties. Some examples show that these substances are also utilized by arthropods. This presents the opportunity to look at a coevolutionary system combined of snails, plants, moths and moth-parasites in which cyanogenesis obviously plays an interesting role.Lecture presented during the Tagung der Deutschen Botanischen Gesellschaft, Vienna, September 1984.