Converts oxidosqualene to cycloartenol and 1% parkeol. Involved in plastid biogenesis. Essential for the male gametophyte function. (S)-2,3-epoxysqualene = cycloartenol Expressed in roots, stems, leaves, inflorescences and siliques. Albino phenotype leading to lethality. Belongs to the terpene cyclase/mutase family.