Antioxidant status of barley seedlings under conditions of excess manganese

Olga Simonova,Evgenija Tovstik,Maksim Simonov,S Knyazev,V Kukhar,O Loretts,M Tsoy,O Panfilova

doi:10.1051/e3sconf/202125401032

Abstract

The system of protection against the effects of heavy metals (TM) can differ not only in different species of plants, but also in different varieties. Manganese (Mn), as a biogenic element, is necessary for normal plant growth and development. However, in the case of concentrations exceeding the optimal level, it negatively affects both linear plant growth and physiological processes. The paper presents data on the assessment of the effect of excess manganese (II) ions (30, 60 and 90 mg/l of active substance) on barley seedlings of different varieties. Resistance of plants to ionic toxicity of manganese (II) was judged by the value of antioxidant activity (AOA) of superoxide dismutase (SOD), the content of low-molecular antioxidants (chlorophyll a and b, carotenoids and anthocyanins) in barley leaves. For most of the varieties studied, an increase in AOA of SOD, the content of anthocyanins indicating the activation of plant protective mechanisms, was noted. The amount of green pigments, as well as carotenoids, on the contrary, decreased, compared with the control, which indicated a violation of the processes of photosynthesis in them.

Highlights

Among heavy metals (HM), manganese is one of the most common chemical elements in the lithosphere
For the Farmer and Bionik varieties, an increase in antioxidant activity (AOA) was recorded under the influence of the lowest concentrations of manganese (II) ions studied in the experiment
In Cucumis sativus plants, both the excess Mn and the optimal light intensity determine the increase in oxidative stress due to an increase in the Mn content in the tissues, which is accompanied by inhibition of plant growth [16]

Summary

Introduction

Among heavy metals (HM), manganese is one of the most common chemical elements in the lithosphere. Regulated by HS 2.1.7.2041-06, the MPC of manganese in the soil, taking into account its clark, is 1500 mg/kg. As well as its deficiency, is a serious problem of crop yield reduction [4]. This is especially true for acidic soils, which include sod-podzolic soils of the Kirov region. In these soils, the negative effect of manganese on plant growth and development is increasing, but the degree of this effect on the physiological processes that take place in them is not sufficiently studied

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