Effects of exogenous methylglyoxal on seed germination and seeding growth of maize under drought stress
Methylglyoxal(MG)is a new type of signal molecule found in plants,which has the functions of regulating plant growth and development,seed germina-tion,cell division,stomatal movement and abiotic stress tolerance.In order to clarify the effect and mechanism of exogenous MG on maize seed germination and seedling growth under drought stress,the maize hybrid Zhengdan 958 was used as the material to analyze the effects of seed soaking treatment with different concentrations of exoge-nous MG on seed germination and growth of maize under drought stress.The effects of exogenous MG on the accumulation of reactive oxygen,membrane lipid peroxidation level,antioxidant enzyme activity and antioxidant content in leaves of seed-lings were further investigated by treatments of drought stress and MG foliar spraying at 3-leaf stage.The results showed that under drought stress,seed soaking with exogenous MG solution could improve the germination potential,germination rate and growth index of maize seeds,and the suitable concentration of MG soaking was 0.10 mmol/L.Spraying 0.10 mmol/L MG on maize seedlings under drought stress could significantly reduce the contents of malondialdehyde(MDA)and hydro-gen peroxide(H2O2)in leaves,enhance the activities of antioxidant enzymes such as superoxide dismutase(SOD),per-oxidase(POD),catalase(CAT)and ascorbate peroxidase(APX)in leaves,and increase the contents of ascorbic acid(ASA)and glutathione(GSH)in leaves.In summary,appropriate concentration of exogenous MG could significantly en-hance the germination ability of maize seeds and the antioxidant capacity of maize seedlings,alleviate the oxidative damage caused by drought stress to maize plants,and promote the growth of maize.The results of this study provide a reference for the drought-resistant cultivation of maize and the development of drought-resistant agents.
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