Journal of Plant Process and Function

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UV ray is able to change several physiologic and anatomic properties of the plants. UV ray can also prevent the plants growth and their desirable performance. Effective role of Silica Nanoparticles in different plants has been proved to enhance plant resistance against biological and non-biological stresses. The present study was performed in the laboratory of the Faculty of Science of Urmia University, in a factorial and random framework to investigate the influence of silica nanoparticles on the growth and physiological characteristics of Lepidium sativum L. during UV-B stress. This study was performed with three treatments (UV-B, Si Np, and simultaneous treatment) in which the concentration of Nanoparticles were determined as 50 mg/L. It should be mentioned that each treatment was repeated three times in equivalent experimental circumstances. The obtained results demonstrated that the length of shoot, the number and surface of the leaves were increased significantly when treatment with Nanoparticles was done. The aforementioned characteristics weren’t increased in simultaneous treatment. Conversely, the thickness of the leaves exhibited a reversed behavior during simultaneous treatment and treatment with silica Nanoparticles, compared with two former properties. The thickness of xylems and phloem were only increased in the case of treatment with UV-B. In all treatments, the concentration of Malone di-aldehyde was increased and a depletion was observed in dissolved sugar content. Moreover, the activity of ascorbate peroxidase and phenyl alanine ammonia lyase were improved in three treatments with Silica Nanoparticles, UV-B stress, and simultaneous treatment. Based on the results of this study, it was observed that the existence of Silica Nanoparticles have positive role to minimize destructive effects of UV-B stresses.

Keywords: UV ray, Silica Nanoparticles, Malon di-aldehyde, Dissolved sugar, Ascorbate peroxidase, and Phenyl Alanin ammonia lyase.

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