Abstract
This study explores the potential medicinal properties of Bletilla striata fibrous roots by comparing their active ingredient contents and antioxidant activity with those in tubers. The study further examines the effects of growth age and origin on the distribution characteristics of medicinal properties in fibrous roots and identifies biomarkers that distinguish these characteristics. The Δ E value of fibrous roots significantly increases with age and is significantly influenced by origin; both the age and origin also significantly affect militarine content and antioxidant activity; a positive correlation exists between appearance quality, active ingredients, and antioxidant activity. The total phenolic content and antioxidant activity of fibrous roots significantly exceed those of tubers. The militarine content in both 1-year-old and 2-year-old fibrous roots complies with the 2020 edition of the Chinese Pharmacopoeia, suggesting that the fibrous roots possess medicinal potential. Additionally, this study demonstrates that the OPLS-DA model can differentiate 1-year-old and non-1-year-old fibrous roots of Bletilla striata and distinguish between their origin.