The effects of exogenous indole-3-acetic acid (IAA)and salicylic acid (SA) on lead tolerance and accumulation in seedlings of Brassica juncea were investigated in a pot experiment with soil contaminated by lead. Treatments were ( 1 )control (CK): without application Pb, IAA and SA, (2)Pb: 500 mg/kg Pb, (3)Pb+IAA: 500 mg/kg Pb/15 mg/L IAA, (4)Pb+SA:500 mg/kg Pb/5Omg/L SA, (5)Pb+IAA+SA: 500 mg/kg Pb and 15 mg/L IAA/50 mg/L SA. Excess Pb inhibited the growth of B. juncea by decreasing the biomass and chlorophyll content, a...