Hairy roots culture
Hairy root culture is a type of plant tissue culture for produce of
volatile compounds [122]. The formation of hairy root in plants or
hair-like root structures is actually the result of a plant disease
caused by a gram-negative bacterium called ”Agrobacterium
rhizogenesis”. These roots are used as a source for the production of
aromatic and volatile substances [123]. Basically, the importance of
hair roots is due to their rapid growth without the need for an external
auxin [8] and their rapid growth compared to conventional roots.
They produce volatile compounds at levels and patterns similar to
natural roots, but secondary metabolites or volatile compounds are also
produced in the airy parts of the plant. The efficiency of this method
is higher than cell culture and by the ingress of abiotic or biotic
elicitors in the culture medium, this efficiency can be further
increased [116].