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Effect of PTIO or l-NAME on primary root growth (A) and number of lateral roots (B) of the S. nigrum roots treated with 400 μm ZnCl2. Asterisks indicate values significantly different from those of the roots treated with Zn alone: * Student’s t test with P < 0.05. PTIO, 0.2 mm PTIO; l-NAME, 0.5 mm l-NAME; Zn, 400 μm ZnCl2; Zn+PTIO, 400 μm ZnCl2 plus 0.2 mm PTIO; Zn+l-NAME, 400 μm ZnCl2 plus 0.5 mm l-NAME.
