Comparison of the Induction of Glutathione S-Transferase in Plants by Treatment with Substrates

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The relationship between the applied chemicals and the substrates were investigated when glutathione S-transferase (GST) activities were induced with chemicals (pretilachlor and CDNB) used as substrates in 4 grasses (rice, barnyardgrass, corn, and large crabgrass). The relation between tolerance to chemicals and GST activities was also studied with an eye to the applied chemical and substrate. The GST activities after treating the roots of 4 plants with pretilachlor or CDNB varied with plant species. The GST activities using the applied chemical as substrate were enhanced more highly than the other chemical in rice and barnyardgrass, and treatment with CDNB enhanced GST (CDNB) activities more than the other in rice, barnyardgrass, and corn. On the whole, however, the patterns of GST induction in 4 plants were specific rather than general. From the point of view of applied chemical and substrate, the tolerance to a chemical seemed more correlated with the GST activity using the chemical as substrate than another substrate. In other words, the difference in activity of GST (CDNB) or GST (pretilachlor) induced by CDNB or pretilachlor, respectively, caused the difference in growth.
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