Trends and Prospects for Quality Improvement in Turmeric through Biotechnological Interventions

Abstract

Turmeric (Curcuma longa L.) is a globally important spice and medicinal crop whose economic value is tightly coupled to quality attributes such as curcuminoid content, essential oil profile, and safety from adulteration and contaminants. Conventional breeding and agronomic management have improved yield and adaptability, but gains in quality traits remain constrained by clonal propagation, long crop duration, complex polyploid genome, and strong environmental modulation of phytochemical composition. Over the last two decades, biotechnology has opened new possibilities for precise quality improvement, ranging from tissue culture–based production of uniform, disease-free planting material to in vitro and cell-culture–based enhancement of curcuminoids and oils, integration of nanotechnology with micropropagation, and use of rhizobacteria to modulate plant metabolism. Parallel advances in turmeric genomics, transcriptomics, and metabolomics now provide a systems-level view of curcuminoid biosynthesis and other specialized metabolites, enabling the identification of candidate genes and pathways that can be targeted for future marker-assisted selection, metabolic engineering, and, eventually, genome editing. This review synthesizes current knowledge on biotechnological interventions directly or indirectly aimed at turmeric quality improvement, critically assesses their impact and scalability, and highlights how chromosome-scale genome assemblies, widely targeted metabolomics, and functional studies on polyketide synthases are reshaping the conceptual toolbox for quality-focused breeding. Finally, it outlines emerging trends—including CRISPR-based editing, synthetic biology and heterologous production, microbiome engineering, and AI-assisted quality phenotyping—and discusses the opportunities and practical constraints in translating these advances into cultivar development and value chain transformation.