ID 4.2.3.33 DE stemar-13-ene synthase. AN stemarene synthase. AN syn-stemar-13-ene synthase. CA 9alpha-copalyl diphosphate = diphosphate + stemar-13-ene. CC -!- This diterpene cyclase produces stemar-13-ene, a putative precursor CC of the rice phytoalexin oryzalexin S. CC -!- Phytoalexins are diterpenoid secondary metabolites that are involved CC in the defense mechanism of the plant, and are produced in response CC to pathogen attack through the perception of elicitor signal CC molecules such as chitin oligosaccharide, or after exposure to UV CC irradiation. DR Q6BDZ9, KSL8_ORYSJ ; //