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Glutathione conjugation reactions are one of the principal mechanisms that plants utilize to detoxify xenobiotics. The induction by four herbicides (2,4-D, atrazine, metolachlor and primisulfuron) and a herbicide safener (dichlormid) on the expression of three genes,  ZmGST27 ,  ZmGT1  and  ZmMRP1 , encoding respectively a glutathione- S -transferase, a glutathione transporter and an ATP-binding cassette (ABC) transporter was studied in maize. The results demonstrate that the inducing effect on gene expression varies with both chemicals and genes. The expression of  ZmGST27  and  ZmMRP1  was up-regulated by all five compounds, whereas that of  ZmGT1  was increased by atrazine, metolachlor, primisulfuron and dichlormid, but not by 2,4-D. For all chemicals, the inducing effect was first detected on  ZmGST27.  The finding that  ZmGT1  is activated alongside  ZmGST27  and  ZmMRP1  suggests that glutathione transporters are an important component in the xenobiotic detoxification system of plants.

Co-Induction of a Glutathione-S-transferase, a Glutathione Transporter and an ABC Transporter in Maize by Xenobiotics