Evaluation of Lead Accumulation in Different Parts of violet (Viola tricolor) and Reaction of the Plant to Lead Oxidative Stress

Document Type : Research Paper

Authors

1 Department of Horticultural science, Agricultural Campus and Natural Resources, University of Tehran, Karaj, Iran

2 Department of Soil Science and Engineering, Agricultural Campus and Natural Resources, University of Tehran, Karaj, Iran.

3 Department of Horticultural Science, College of Agriculture & Natural Resources, University of Tehran

Abstract

Nowadays, soil contamination with heavy metals is one of the major environmental concerns. Among heavy metals, lead is one of the main concerns due to its effects on human health and environment. The most important sources of this pollution in most parts of the world are mines, industrial waste, chemical fertilizers and pesticides. In order to investigate the adsorption capacity of lead by the ornamental plant of viola (Viola tricolor) and to find the morphological and physiological responses of plant against lead stress, a study in contaminated soil with different levels of lead (0, 200 and 400 mg/kg) was done in a completely randomized design with five repetitions in the greenhouse of the Faculty of Agriculture, University of Tehran. The results showed by increasing the concentration of lead in the soil, its amount increased in three parts of shoots, roots and flowers of the plant and the highest accumulation of lead in the roots was found to be 41.27 mg/kg. The high lead pollution reduced the fresh and dry weight of shoots and roots and the root length as compared to the control. Also, total antioxidants and glycine betaine as a defensive factor against stress were found at a concentration of 400 mg/kg lead, which were 61.3% and 114.33 μmol/g, respectively. Therefore, violet can be recommended as an adsorbent of lead and a stress reliever in urban and industrial green space cultivation.

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References

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Iranian Journal of Soil and Water Research
Volume 51, Issue 8
October 2020
Pages 1997-2006

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