The role of peroxidase in formation of nonspecific wheat plants tolerance via immunomodulators

Abstract

Aim. The usage of biological elicitors for plant defense responses against plant pathogenic fungi may initiate tolerance of plants and prevent environmental pollution. The aim of research was to investigate the role of peroxidase under combined action of oxalic acid and NO in elicitation of wheat systemic defense responses against Septoria tritici blotch agent in field trials. Methods. The peroxidase activity was measured in leaves of elicitor-treated winter wheat plants (cv. Poliska 90 and Stolychna) after S. tritici blotch inoculation during ontogenesis. The morphometric parameters, extent of disease development and yield structure were analyzed. Results. The data obtained suggest that oxalic acid induced in both wheat cultivars (Stolychna and Poliska 90) defense responses against S. tritici blotch agent. Initiation of defense responses in elicitor-treated plants occured shortly. The effect of oxalic acid treatment increased the hydrogen peroxide content. The effect of oxalic acid also increased the grain quantity and plant height. Conclusions. Elucidation of biochemical nature of the defense responses elicitation revealed increased peroxidase activity for lignin synthesis and mechanical strengthening of the plant cell walls.

Keywords: peroxidase, oxalic acid, NO, Triticum aestivum L., Septoria tritici.