Engineered Sustainable Substitute: Roots of Seed-Propagated Saposhnikovia divaricata at Bolting-Stage as a Crop Engineering Solution for Wild Resource Replacement
Abstract
Overharvesting of wild Saposhnikovia divaricata, the source of Saposhnikoviae Radix (SR), has posed critical ecological challenges and failed to meet industrial demand, necessitating engineered cultivation solutions. This study conducts an engineering assessment of roots from seed-propagated and root-cutting-propagated S. divaricata as technologically optimized substitutes for wild resources. Root samples from five major production regions were evaluated using both morphological characterization (in accordance with pharmacopoeia standards) and high-performance liquid chromatography (HPLC) for targeted phytochemical analysis of prim-O-glucosylcimifugin (POG) and 4’-O-β-D-glucosyl-5-O-methylvisamminol (GOM), collectively termed POGM. Engineered cultivation dynamics were further analyzed across four developmental stages (S1: rosette, S2: bolting, S3: immature fruit, and S4: fruit maturation) for seed-propagated S. divaricata. Results showed that roots from seed-propagated S. divaricata at the S2 exhibited morphological consistency with wild S. divaricata and comparable POGM levels (0.97% vs. 1.06%), meeting the engineered quality threshold (≥0.24%) specified by pharmacopoeia standards. In contrast, roots from root-cutting-propagated S. divaricata showed significant morphological deviations and sub-optimal POGM content (<0.70%). Stage-specific analysis revealed that S2-stage represent the optimal engineered harvest window, balancing root biomass accumulation and phytochemical expression. These findings validate an engineered cultivation strategy for SR, whereby seed-propagation combined with precise stage-based harvesting (S2) offers a scalable, eco-friendly technological solution to mitigate wild resource depletion. The study highlights the potential of crop engineering approaches in optimizing medicinal plant sustainability.