PJB-2018-293
AZIDE AND IMIDAZOLE REDUCE PEROXIDE ACCUMULATION AND IMPROVE MAIZE SEED GERMINATION UNDER AL STRESS
YIFEI ZHANG
Abstract
Soil acidification impairs crop seed germination due to low pH enhanced Al toxicity, which induces reactive oxygen species (ROS) over-production. To improve germination, reducing ROS toxicity is required. Here, the effects of azide, imidazole, dimethylthiourea (DMTU), ascorbate, glutathione and melatonin on maize seed germination were evaluated under Al stress. Al stress exhibited profoundly inhibition on seed germination under low pH conditions. This was further aggravated by H2O2; however, azide and imidazole reversed the effect, even more so than the ROS scavengers dimethylthiourea, ascorbate, glutathione and melatonin. However, azide and imidazole exhibited greater inhibition of H2O2 and lipid peroxide accumulation than dimethylthiourea in germinating seeds under Al stress. In the discussion, we considered the stronger inhibition of ROS accumulation by azide and imidazole over other antioxidants can be partly attributed to their inhibition of certain ROS producing enzymes (such as cell wall peroxidase and NADPH oxidase). Azide and imidazole, as two cheap compounds, can be widespread used for improvement of seed germination under acid conditions.
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