(a) Hairy roots of peanut cv. Andru II initiated from stem explants. (b) Hairy roots of peanut cv. Andru II line 2 cultured in B5 medium. Scale bar, 5 mm. (c) Roots (wild-type) from peanut seedlings cultured in B5 medium. Scale bar, 5 mm. (d) Elicitation of hairy root cultures of peanut cv. Andru II. Twelve-day cultures were either non-elicited (control) or elicited for 24 h with 10.2 mM NaOAc or 600 μM CuSO4.