Effect of 2,4-Dichlorophenoxy Acetic Acid on Antioxidant Systems in a Non-Target Plant (Zea mays L.) | ||||
| Catrina: The International Journal of Environmental Sciences | ||||
| Article 3, Volume 22, Issue 1, October 2020, Page 19-27 PDF (924.83 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/cat.2020.33512.1056 | ||||
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| Authors | ||||
Hanan Abou-Zeid   1; Salwa Ahmed Abdel-Latif 2; Ghada Saber Ismail1
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| 1Botany and Microbiology Department, Faculty of Science, Alexandria University | ||||
| 2Biology and Geology Department, Faculty of Education, Alexandria University | ||||
| Abstract | ||||
| This work aimed to study the impact of various concentrations of the herbicide 2,4-D dichlorophenoxyacetic acid (2, 5, 10 mg L-1) on fresh and dry biomasses, photosynthetic pigments, quantum yield of PSII (Fv/Fm) and oxidative stress parameters on 28-day old Zea mays leaves. Foliar application of a low dose of 2,4-D significantly promoted the growth biomarkers, whereas, the high doses induced severe disturbances and reduced the growth attributes. This situation produced over-accumulation of hydrogen peroxide (H2O2) and lipid peroxidation (MDA) and that was accompany with a significant increase in activity of superoxide dismutase (SOD), catalase (CAT) and glucose-6-phosphate dehydrogenase (G6PDH). Otherwise there was a significant decline in ascorbate peroxidase (APx), guiacol peroxidase (GPX), glutathione peroxidase (GSHPx) and glutathione reductase (GR). Moreover, a significant decline of glutathione (reduced form; GSH) and ascorbic acid (AsA) contents, glutathione redox potential (GSH/GSSG), NADPH and NADPH/NADP+ ratios were recorded. These observations might indicate that high doses of 2,4-D caused a menace to non-target plants through the disruption of antioxidant systems. | ||||
| Keywords | ||||
| Antioxidant enzymes; glutathione; hydrogen peroxide; maize; photosynthetic pigments | ||||
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