Since ages plants with therapeutic effects are used for curing several human ailments. With the development in modern biotechnological tools, these therapeutic compounds could be overexpressed in the plants. This review aims to compile the valuable information from the examples in the literature, regarding the biotechnological tools those could be useful for the overproduction of health-promoting biochemicals in the medicinal plants. Gene level modification is all about creating improved variety of plants that are highly resistant to pests and pesticides or contain higher levels of nutrients than conventional plants. Plant secondary metabolites constitute an exciting and vital aspect of research, due to their chemical diversity, varied biological functions and pharmacological activities. Gene modification, through Agrobacterium mediated transformation, RNA interference or CRISPER/Cas9, has opened avenues of improvement in medicinal plants and provide an alternative production system of pharmaceutically important secondary metabolites for their commercial exploitation.
Key words: Gene modification, Agrobacterium, RNA interference, CRISPR/Cas9, Medicinal plants.