alkene biosynthesis ethylene biosynthesis ethylene biosynthesis via S-adenosyl-L-methionine Biosynthesis of ethylene, an unsaturated hydrocarbon that contains one double bond (the simplest alkene). It acts as hormon in plant where it is essential for proper development, growth and survival. It is responsible for signaling changes during germination, flower and fruit development, the onset of plant defense responses, and cross-talk with other plant hormones. GO:0009693 KEGG:map01100 KEGG:map01110 KEGG:map00270 pathway UPa:UPA00384 PMID:16492477 MetaCyc:ETHYL-PWY PMID:16524685 plant hormone biosynthesis