ABSTRACT: Selenium (Se) is beneficial for some plants and is able to increase resistance and antioxidant capacity of plants subjected
to stressful environment. In this work, the effects of enhanced ultraviolet-B (UV-B) radiation, Se supply, and their combination
on growth and physiological traits of wheat (Triticum aestivum L., cv. Han NO.7086) seedlings were studied. The objective was to elucidate whether Se could alleviate the expected adverse
effects of UV-B stress on seedlings. UV-B treatment caused a marked decline in growth parameters and total chlorophyll content
and changed biomass allocation between aboveground and underground parts, which led to an increase in the root/shoot ratio.
UV-B treatment also increased MDA content and the rate of superoxide radical (O2·−) production, although it increased some antioxidant (proline, phenolic compounds, and flavonoids) content and activity of
antioxidant enzymes (peroxidase, superoxide dimutase, catalase (CAT)). Se treatment only increased total chlorophyll content
and CAT activity. Compared with UV-B treatment alone, the combined treatment with UV-B and Se induced a significant increase
in the biomass, total chlorophyll content, antioxidant content, and activity of antioxidant enzymes, and an evident decrease
in MDA content and the rate of O2·− production. The results of this study demonstrated that Se alleviated the damage caused by UV-B to wheat seedlings to some
extent by increasing antioxidant enzyme activity and antioxidant content.
–enhanced UV-B–selenium–malondialdehyde–the rate of superoxide radical production–antioxidant enzymes–antioxidants
Russian Journal of Plant Physiology 04/2012; 58(2):283-289. · 0.71 Impact Factor