Alleviation of nickel toxicity in wheat (Triticum aestivum L.) seedlings by selenium supplementation

Abstract

hydroponically grown wheat seedlings were treated with 50 µm ni and/or 15 µm Se. After a 7-day culture period, their growth parameters, ni, Se, fe, and mg contents, electrolyte leakage, photosynthetic pigment concentrations, and photochemical activity of photosystem ii were determined. exposure of wheat seedlings to ni alone resulted in reduction in the total shoot and root lengths, by 22% and 50%, respectively. Addition of Se to the ni-containing medium significantly improved the growth of these organs, compared to the seedlings subjected to ni alone. Application of Se decreased the accumulation of ni in shoots and roots and partially alleviated the ni-induced decrease in fe and mg concentations in shoots. electrolyte leakage increased in response to ni stress, but in shoots it was diminished by Se supplementation. exposure to ni led to a decrease in chlorophyll a and b contents and enhancement of chlorophyll a/b ratio, but did not influence the concentration of carotenoids. enrichment of the ni-containing medium with Se significantly increased chlorophyll b content, compared to the seedlings treated with ni alone. Photochemical activity, estimated in terms of the maximum quantum yield of photosystem ii, decreased in response to ni treatment but was significantly improved by simultaneous addition of Se. results of our study suggest that alleviation of ni toxicity in wheat seedlings by Se supplementation may be related to limitation of ni uptake.

The Effect of Selenium Application on Plant Health Indicators of Garden Pea (Pisum sativum L.) Varieties

“…Similar results were examined by Poblaciones et al (2013) stating a deceleration of root growth and mortification of germinated garden peas at higher doses of sodium selenate. Even though selenium in hydroponically grown wheat seedlings at low doses promoted plant growth, it is toxic at the concentrations (150 mg. dm -3 ) (Gajewska et al 2013).…”

Exogenous Mineral Regulation Under Heavy Metal Stress: Advances and Prospects

“…Various experiments have been conducted to show the ameliorative behavior of minerals against the heavy metal toxicity. For instance, Gajewska et al [13] [6]. Heavy metals induce the DNA damage, Lipid peroxidation, disrorted the binding sites of various enzymes, ROS production [9] and cause mineral deficiency in plant [7].While the exogenous application of minerals alleviate the heavy metal toxicity by competing at the binding sites of transporters [13] increase the production of antioxidant enzyme [14], Mineral also prevent the heavy metal accumulation by the formation of apoplastic barrier like casparian strips [17] as well as ncrease the root length by inducing the cell expansion [31,32].…”

Health Risk Connected With the Low Selenium Levels in Foodstuffs of Mongolia

“…The situation is redoubled by the fact that heavy metals are well known Se antagonists (Gajewska et al, 2014;Golubkina & Papazyan, 2006) and, as a result, they decrease the accumulation intensity of Se by plants and assimilation of Se by animals and human beings. Cd, Pb and Ni excess in food is known to stimulate lung cancer development (Aquino, Sevigny, Sabangan, & Louie, 2012).…”

“…At the same time antagonism of Se with heavy metals can decrease accumulation of the latter by plants. In case of environmental pollution with Ni it will also improve Fe and Mg accumulation by plants (Gajewska et al, 2014).…”