Chemometric Analysis of the Stem and Leaf of Gentiana rigescens in Agroforestry Systems Cloning, sequence analysis, and prokaryotic expression of GrGPPS gene in Gentiana rigescens Study on the Tissue Culture of Gentiana rigescens Franch. ex Hemsl. by Fourier Transform Infrared Spectroscopy Variation of botanical morphologic characteristics between wild and cultivated populations of Gentians rigescens in Yunnan-Guizhou Plateau Variation of botanical morphologic characteristics between wild and cultivated populations of Gentiana rigescens in Yunnan-Guizhou Plateau Cloning, sequence analysis, and prokaryotic expression of GrCYP450-17 gene in Gentiana rigescens