List of Articles tryptophan Open Access Article Abstract Page Full-Text 1 - Arbuscular Mycorrhizal fungi and precursor feeding improve protein and trypthopan decarboxylase enzyme content in Cathaaranthus roseus L. Samaneh Rahmatzadeh1*, Jalil Khara1 and Seyed Kamal Kazemitabar2 10.30495/ijpp.2012.540780