It’s a misspelling of teratogen(ic) an agent or factor which causes malformation of an embryo. Mutagens like radiation or various chemicals are utterly normal parts of conventional plant breeding. Most of the mutated plants are garbage because there’s are many more ways for things to go wrong than right but occasionally you get something promising.

Thanks!

iphone keyboard fail. As note, when properly spelled it means causing mutation or more specifically developmental abnormalities. From the greek meaning study of monsters.