Insights into the Genetic Improvement of Carrot (Daucus carota L.)

Carrots, identified scientifically as Daucus carota L. and classified within the Apiaceae family, possess considerable economic and nutritional importance as root vegetables. Enriched with bioactive phytochemicals mainly α, β, γ-carotene, xanthophyll, anthocyanins, dietary fiber, vital vitamins, polyphenols, and flavonoids, it provides additive and synergistic health benefits apart from basic nutrition. These bioactive compounds are important antioxidants that protect cells by combating reactive oxygen species. The healthy nutritional profile of the carrot crop attracts researchers to study metabolomics and genomics of the crop for deploying genetic engineering and breeding techniques to improve quantitative and qualitative traits to enhance plant protection for human health and food security. Characterization of the transcriptome and validation of the functions of crucial enzymes engaged in carotenoid and other phyto-element biosynthesis have substantiated the biological roles of these compounds in fostering collaborative health advantages. Research on analyzing genome sequence data has resulted in the establishment and widespread use of high-throughput methods for potential genetic manipulation using the CRISPR editing system. This has aided in identifying target genes involved in terpenoid and flavonoid biosynthesis, stress resistance mechanisms, and regulatory pathways governing hormone regulation, flowering, and tissue culture regeneration. These findings have been utilized to develop more efficient strategies for enhancing carrot genetics. This chapter aims to unravel the aspects of genetic improvement based on genome editing and breeding resulting in the nutritional enhancement of carrots. Future perspectives of unexplored boundaries at the level of gene manipulation for sustainable crop improvement of carrots are also briefly reviewed.