Effects of Exogenetic Selenite and Selenate on the Growth and Physiological Metabolism of Winter Wheat
Pot experiments were conducted to investigate the effects of exogenetic selenite and selenate on the growth and physiological metabolism of winter wheat in order to provide theoretical basis for the planting of selenium-enriched wheat. The results showed that exogenetic selenium inhibited wheat seedling growth (plant height and biomass) at all selenium levels. However, selenium first stimulated and then inhibited wheat growth as the increase of exogenetic selenium concentration in the late growth stage. The EC10 for Se(Ⅳ) and Se( Ⅵ) increased from 1.40 mg·kg-1 and 0.28 mg-kg-1 at seedling stage to 28.48 mg-kg-1 and 4.56 mg-kg-1 at the harvest stage, respectively. Selenite had greater influence on the growth of wheat than selenate. Wheat yield first increased and then decreased as the increase of added selenium, and reached the maximum values at 2.5 mg-kg-1 for selenite and 1 mg-kg-1 for selenate treated plants. Physiological metabolism analysis of winter wheat leaves showed that lower concentration of selenium in soil(Se( Ⅳ ) ≤5 mg·kg-1 and Se( Ⅵ )≤0.5 mg·kg-1) stimulated the activity of GSH and POD, and decreased MDA(Se≤2.5 mg·kg-1) contents significantly; the contrary results were found for higher concentration selenium treated plants.
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