Effect of the herbicide atrazine on NtSAT4 single and double overexpressor lines and wild-type. One-month-old non-transformed (Wt), NtSAT4 single overexpressor lines mitochondrial (M) and plastidic (P) and double overexpressor lines mitochondrial × cytosolic (M×C) and mitochondrial × plastidic (M×P) plantlets grown on 1/4-strength MS hydroponic media. Plants were treated with control (1/4-strength MS), 12 µl atrazine for 48 hrs, and 24 µl for 24 hours. These were kept under control conditions in the growth room under continuous light. Scale bar = 8cm.