Depicting the physiological and ultrastructural responses of soybean plants to Al stress conditions.

摘要: Abstract Aluminium (Al) is a toxic element for plants living in soils with acidic pH values, and it causes reductions the roots shoots development. High Al concentrations can cause physiological structural changes, leading to symptoms of toxicity plant tissue. The aim this study was describe soybean through physiological, nutritional, ultrastructure analyses. Plants were grown nutrient solution containing increasing (0; 0.05; 0.1; 1.0, 2.0 4.0 mmol L−1). characterized by anatomical, biochemical carbon dioxide assimilation rates stomatal conductance not affected Al. However, capacity internal use decreased, transpiration rate increased, resulting increased root biomass at lowest concentration solution. exposed highest exhibited lower shoot biomass. nitrate reductase urease activities decreased concentration, indicating that nitrogen metabolism halted. superoxide dismutase peroxidase availability solution, they higher roots, showing their role detoxification. Despite presenting external lesions damaged cap, xylem phloem diameters leaf diameter showed ultrastructural alterations under These results have contributed our understanding several histological mechanisms plants.