Plant Tissue Culture Techniques for Secondary Metabolite Production: A Review

Abstract

Plant-derived secondary metabolites hold significant value due to their diverse therapeutic, cosmetic, and industrial applications. Traditional extraction methods from wild or cultivated plants face major challenges such as low yield, long growth cycles, seasonal dependency, and ecological threats to endangered species. The review aims to investigate plant tissue culture techniques for secondary metabolite production. Plant tissue culture offers a promising alternative by enabling the controlled, scalable, and sustainable production of bioactive compounds under aseptic and regulated environmental conditions. Techniques such as callus culture, cell suspension culture, organ culture, protoplast culture, and hairy root culture have been successfully employed to produce a wide range of secondary metabolites, including alkaloids, flavonoids, terpenoids, glycosides, and phenolics. Advances in biotechnological interventions like Agrobacterium-mediated transformation, RNA interference (RNAi), CRISPR/Cas9 gene editing, and metabolic engineering have further enhanced metabolite yield and specificity. The use of elicitors and precursor feeding strategies has proven effective in stimulating biosynthetic pathways. Scaling up these systems using bioreactors has enabled the commercial production of high-value compounds such as paclitaxel and ginsenosides, although technical and economic challenges remain in process optimisation, genetic stability, and downstream processing. Despite these limitations, the advantages of tissue culture, such as independence from environmental variables, protection of threatened plant species, and capacity for year-round production, support its growing application in pharmaceutical and nutraceutical industries. Continuous research integrating omics technologies, synthetic biology, and advanced bioreactor design is expected to improve production efficiency and economic feasibility. Plant tissue culture systems for secondary metabolite production, highlighting key methodologies, influencing factors, genetic tools, commercial applications, and future directions. As global demand for natural bioactive compounds rises, plant tissue culture stands out as a vital tool for ensuring sustainable and efficient production, bridging the gap between nature and industrial-scale synthesis of medicinally important molecules. In conclusion, as demand for plant-derived pharmaceuticals continues to grow, tissue culture offers a viable alternative to traditional extraction, ensuring consistent, efficient, and eco-friendly production of therapeutic compounds with immense potential for future biotechnological innovation and global healthcare applications.