AI Article Synopsis
- - This study explored how short-term exposure to iron (Fe) and copper (Cu) affects root growth and physiological changes in wheat seedlings, using varying concentrations (0, 100, 300, and 500μM) of each metal.
- - Both metals reduced root and shoot lengths, but only high Cu levels (500μM) inhibited seed germination, with Cu causing more severe damage to root cells compared to Fe.
- - Higher concentrations of Fe increased total chlorophyll content in leaves, while high Cu levels decreased it; moreover, Fe stimulated certain enzyme activities, while Cu increased catalase and peroxidase activities in leaves, leading to varying hydrogen peroxide (H2O2) levels between the two treatments
Article Abstract
The purpose of this study was to analyze phytotoxicity mechanism involved in root growth and to compare physiological changes in the leaves of wheat seedlings exposed to short term iron (Fe) and copper (Cu) stresses (0, 100, 300 and 500μM). All applied Fe or Cu concentrations reduced root and shoot lengths, but seed germination was inhibited by Cu only at 500μM. Analyses using fluorescent dye 2',7'-dichlorodihydrofluorescein diacetate indicated enhanced H(2)O(2) levels in seedling roots under Fe and Cu treatments. Cu stress at the same concentration induced a great reduction in cell viability and a strong damage on membrane lipid in the roots with respect to Fe treatment. Significant increases in the total chlorophyll (chl) content including chl a and chl b were observed in response to higher Fe concentrations, whereas the highest Cu concentration (500μM) led to significant decreases in the total chl content including chl a. Additionally, leaf peroxidase (POD) and ascorbate peroxidase (APX) were stimulated by Fe stress, but the highest Fe concentration exhibited inhibitory effect on leaf APX activity. In contrast, copper treatment resulted in an elevation in leaf catalase and POD activities. Therefore, H(2)O(2) content in the leaves associated with copper was significantly lower than that with iron at the same concentration.
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| http://dx.doi.org/10.1016/j.ecoenv.2012.09.010 | DOI Listing |
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