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Plant growth parameters and dendrobine content. Total fresh weight (FW) (A) and dendrobine content (B) of D. nobile from five different habitats. Asterisks indicate significant differences relative to the control (*P < 0.05, Student’s t test). Wild Danxia rock, WDR; large Danxia stone, LDS (>20 cm × 20 cm, greenhouse); broken Danxia stone, BDS (<2 cm × 2 cm, greenhouse); broken coarse sandstone, BCSS (<2 cm × 2 cm, greenhouse); and wood spile, WS (greenhouse). *P ≤ 0.05.
