Interactions between salicylic acid and antioxidant enzymes tilting the balance of H2O2 from photorespiration in non-target crops under halosulfuron-methyl stress.

摘要: Abstract Halosulfuron-methyl (HSM) is a safe, selective and effective sulfonylurea herbicide (SU) for the control of sedge broadleaf weeds in sugarcane, corn, tomato, other crops. The primary site action acetolactate synthase (ALS), key enzyme branched chain amino acids (BCAAs) synthesis. In addition to ALS inhibition, BCAAs deficiencies oxidative damage may be involved toxic effects SUs. However, secondary targets HSM relevant plant physiological responses are unclear. present study, comparative growth inhibition peroxidization injury between sensitive tolerance crops were observed at biochemical levels suggesting involvement H 2 O , ethylene, salicylic acid (SA) stress HSM. caused accumulation stimulated photorespiration consequent SA that worsened C 3 soybean ( Glycine max). low concentrations could lessened by supplementary BCAAs, reactive oxygen species scavengers or ethylene inducers, whereas oxidation high not reversed ultimately lead death. level antioxidase system including glutathione S-transferase activities HSM-tolerant 4 maize Zea mays ), which contributes tolerance. plays an important role on both HSM-sensitive maize.