The book discusses the various methods and protocols available in hairy root culture-based research. The utilization of Agrobacterium mediated genetic transformation and establishment of hairy root cultures has paved the way for large-scale secondary metabolite production in medicinal plants. Presenting recent research and offering insights from eminent research groups, the book covers a range of topics related to hairy root-based applications, including (i) establishment of hairy roots and native production of SM (ii) yield enhancement strategies for increased SM production, like elicitation (iii) hairy roots as a tool for value-added applications such as plant-microbe interaction, characterization of plant genes and root biology studies. As such it is an informative guide and experimental manual for researchers in diverse fields of plant biology.