PJB-2017-515
AMELIORATON EFFECT OF PESTICIDE OMETHOATE ON MAIZE SEED GERMINATION UNDER SALT STRESS
Yifei Zhang
Abstract
Omethoate (OM) is a highly toxic organophophorus pesticide, which is resistant to biodegradation in the environment and is widely used for pest control in agriculture. However, it is inevitable that some OM is sprayed onto the soil. Here, the effect of this pesticide on maize seed germination was evaluated under salt stress. Salt (800 mM NaCl) can profoundly arrest seed germination. However, this can be significantly reversed by OM treatment. Subsequently, H2O2 or paraquat treatment can further enhance OM promoted seed germination. A higher content of H2O2 was detected in OM treated seeds compared with the water control under abiotic stress. However, this OM increased seed germination can be significantly attenuated by the addition of DMTU, a specific scavenger of reactive oxygen species (ROS). Two specific inhibitors (DPI and imidazole) of NADPH oxidase were added and OM enhanced germination was impaired. In addition, the OM improved seed germination was reduced or further enhanced after the addition of ABA and fluridone (a specific inhibitor of ABA biosynthesis), respectively. Taken together, we considered the interaction between ROS and ABA affected the maize seed germination under salt stress. Finally, the significance of OM improved seed germination under abiotic stress was discussed.
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