Effect of metolachlor on the leaf discs of NtSAT4 single and double overexpression lines. Leaf discs of single overexpressor lines cytosolic (C), mitochondrial (M), and plastidic (P) and double overexpressor lines mitochondrial × plastidic (M×P) and mitochondrial × cytosolic (M×C) lines and wild-type plants exposed to 24µl metolachlor. Leaf discs were kept under continuous light for 24 hours at room temperature. Scale bar = 1 cm.