The Beneficial Effect of Selenium in Protecting Plants Against Arsenic Stresses
In agricultural fields, accumulation of heavy metals such as arsenic limits crop productivity. Arsenic is known to disrupt the biological function in the plants by inhibiting their growth and developmental process. Moreover, arsenic accumulation particularly the inorganic arsenic in edible plants poses threat to the food chain especially humans. In the presence of selenium, plants through their roots can selectively absorb selenium over arsenic. The suspected antagonism effect between Arsenic (As) and Selenium (Se) in various plant species gave reason to make investigation about effect of selenium on arsenic in the plant. The effect of arsenic and selenium, either alone or in co-exposure on plant growth has been studied in several plant species. There has been a growing interest in selenium as an important micronutrient not only for animals and humans but also for plants. In particular, its protective effect in plants exposed to stressful conditions has been supported. The oxidative damage that can be caused by arsenic was lowered with selenium exposure, which might be related to elevated levels of enzymatic and non-enzymatic antioxidants. This review was focused on the beneficial effects of selenium on arsenic-induced stress in plants, with an accentuation on the roles of selenium in giving tolerance against abiotic stressors.
Arsenic Toxicity, Arsenic Tolerance, Selenium, Plant Stress
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