Effect of Methyl Jasmonate Seed Treatment on the Response of Wheat Plants to Excess Zinc Ions in Root-Inhabited Substrate
摘要
Under controlled environment conditions, the influence of methyl jasmonate (MeJA, 10 μM) seed treatment on growth, photosynthetic apparatus, oxidative stress development, activity of some antioxidant system components and zinc content in wheat grown with optimal (2 μM) or excessive (1500 μM) zinc concentrations was studied. It was shown that zinc excess led to the accumulation of this metal in wheat organs, had an inhibitory effect on shoot and root growth, caused inhibition of photosynthetic rate, a slight decrease in Fv/Fm, and accumulation of malondialdehyde (MDA). At the same time, the membrane structural integrity was preserved, as indicated by the absence of changes in membrane permeability. The activities of superoxide dismutase (SOD), catalase (CAT) and guaiacol peroxidase (GPX) did not change under these conditions while the proline content increased. MeJA seed treatment under excess zinc enhanced growth inhibition but did not significantly affect Fv/Fm, stomatal conductance, photosynthetic rate, and zinc content in wheat organs. However, as far as photosynthesis is concerned, we note some positive dynamics, which we regard as a non‑statistically confirmed trend. In addition, in this type of experiment, MeJA seed treatment had no effect on oxidative stress development and the activity of antioxidant system components, but reduced zinc content in wheat roots and had a positive effect on chlorophyll and carotenoid content. It is suggested that an increase in the content of photosynthetic pigments, an increase in growth inhibition, and a decrease in zinc content in roots may play an adaptive role in this case.