Hairy roots show which characteristic?
Phenotype of transformed roots reflects activity of rol genes integrated into nuclear genome. rolA, rolB, rolC alter auxin perception and secondary metabolism. Roots exhibit lack of strong positive geotropism, grow plagiotropically or ageotropically on agar, and display prolific lateral branching due to diminished apical dominance and enhanced pericycle activation. Branch tips are covered with dense root hairs, increasing surface area. Growth occurs without exogenous auxin on hormone-free medium, showing hormone autotrophy, and biomass accumulation is rapid, doubling every 2 to 3 days in liqui
Ref: Nilsson 1997 rolB auxin sensitivity; Casanova Trends Plant Sci 2005 morphology; NCBI NBK21344; https://doi.org/10.1016/j.tplants.2005.08.004 hairy root branching review.