Abstract
Brassinosteroids (BRs) are a widespread group of plant hormones. These phytohormones play a crucial role in the regulation of growth and development of various plant species, and they demonstrate high biological activity. BRs are considered to demonstrate protective activity in the plants exposed to various stresses. Due to rapid industrialization and urbanization, heavy metals have become one of the most important plant stressors. In plants, accumulation of heavy metals beyond the critical levels leads to oxidative stress. However, BRs may inhibit the degradation of lipids, resulted from the overproduction of reactive oxygen species under stress conditions, and increase the activity of antioxidants. They also have the ability to promote phytochelatins synthesis.
Highlights
Brassinosteroids (BRs) are plant hormones that belong to the class of polyhydroxy steroids
It has been proved that after the application of 24-epibrassinolide (EBL, one of the BRs) the lead content in a beet root is even 50% lower than in plants treated with metal alone, since this hormone considerably reduces the absorption of this metal (Khripach et al, 1999)
Toxicity related with metal activity leads to overproduction of reactive oxygen species (ROS) and causes oxidative damage resulting in membrane destruction, which in turn affects the levels of antioxidants and metallozymes or antioxidant enzymes (Pandey et al, 2005)
Summary
Brassinosteroids (BRs) are a widespread group of plant hormones. These phytohormones play a crucial role in the regulation of growth and development of various plant species, and they demonstrate high biological activity. Due to rapid industrialization and urbanization, heavy metals have become one of the most important plant stressors. Accumulation of heavy metals beyond the critical levels leads to oxidative stress. BRs may inhibit the degradation of lipids, resulted from the overproduction of reactive oxygen species under stress conditions, and increase the activity of antioxidants. They have the ability to promote phytochelatins synthesis.
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