Determination of gamma-aminobutyric acid and seventeen free amino acids in Pinus massoniana Needles by reversed-phase high performance Gamma-aminobutyric acid mediates the nicotine biosynthesis in tobacco under flooding stress Gamma-aminobutyric acid mediates the nicotine biosynthesis in tobacco under flooding stress Anxiolytic-like effects of Antianxietic Compound Prescription with Valerianae Jatamansi Rhizoma et Radix Anxiolytic-like effects of Antianxietic Compound Prescription with Valerianae Jatamansi Rhizoma et Radix