Fig. 1From: Metabolomics analysis reveals the metabolite profiles of Rheum tanguticum grown under different altitudinal gradientsComparison of aboveground traits of same-aged plants grown at different experimental sites (LD: Ledu; MH: Minhe; DT: Datong; HZ: Huzhu; GL: Guoluo). Significant differences at P < 0.05 are indicated by different lettersBack to article page