AI Article Synopsis
- Selenium (Se) enhances plants' ability to tolerate stress from heavy metals, particularly arsenic (As), by boosting their antioxidative capacity.
- Research focused on the fern Pteris vittata L., which is known to absorb high levels of As, and examined how different concentrations of Se affected its As uptake.
- The study found that adding 5 microM of Se increased As levels in the ferns by 7-45% and reduced lipid peroxidation by 26-42%, suggesting Se acts as an antioxidant that helps mitigate oxidative stress in the plants.
Article Abstract
Selenium (Se) is a non-metallic element, which has the capability to increase the antioxidative capacity and stress tolerance of plants to heavy metals. Plants vary considerably in their physiological response to Se. The reported research investigated the effects of Se on arsenic (As) uptake by As hyperaccumulator Pteris vittata L. and determined possible mechanisms of interaction. Pteris vittata plants were exposed hydroponically to 0, 150 or 300 microM of Na(2)HAsO(4) in the presence of 0, 5 or 10 microM of Na(2)SeO(4) for 5 or 10d. Application of 5 microM Se enhanced As concentration by P. vittata fronds by 7-45%. At 5 microM, Se acted as an antioxidant, inhibiting lipid peroxidation (reduced by 26-42% in the fronds) via increased levels of thiols and glutathione (increased by 24% in the fronds). The results suggest that Se is either an antioxidant or it activates plant protective mechanisms, thereby alleviating oxidative stress and improving arsenic uptake in P. vittata.
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| http://dx.doi.org/10.1016/j.biortech.2008.08.026 | DOI Listing |
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