Abstract
ABSTRACTIn this study, triacontanol (TRIA) and nitric oxide (NO) interaction on arsenic (As)-induced oxidative stress tolerance in coriander (Coriandrum sativum L.) plants was investigated. The results showed that As had a significant adverse effect on the plant’s biomass. The seedlings pretreated with TRIA and NO significantly increased growth reduction induced by the metalloid. The obtained results indicated that the application of TRIA and sodium nitroprusside (SNP) generally reduced oxidative markers such as of electrolyte leakage percentage, malondialdehyde and H2O2 contents under As toxicity, while application of As treatment without TRIA + SNP increased these oxidative parameters compared to the control. The non-enzymatic antioxidant contents such as total phenol, anthocyanin, carotenoid, ascorbic acid and reduced glutathione (GSH) were extracted and assayed from both control and treated plants. It was found that TRIA + SNP treatments have a profound effect on the antioxidant metabolism and caused an enhancement in non-enzymatic antioxidant potentials under As toxicity in coriander. Moreover, the results revealed a mutually amplifying reaction between TRIA and NO in reducing As-induced damages.
Highlights
Heavy metal (HM) toxicity as one of the major abiotic stresses induces hazardous effects in crop plants
The beneficial effects of TRIA and nitric oxide (NO) were seen by all growth parameters and were shown to be statistically significant especially when these compounds were supplied together
As stress caused significant accumulations of H2O2 in coriander leaves compared to the control
Summary
Heavy metal (HM) toxicity as one of the major abiotic stresses induces hazardous effects in crop plants. GSH as a central molecule of antioxidant defense systems is involved in either direct or indirect control of ROS and MG and their reaction products in plant cells, protecting the plant from HM-induced oxidative damage (Hossain et al 2012). It remains the case that reduction of O2 to superoxide by the thylakoid electron transport chain can prevent overreduction (redox poisoning) and contribute to chloroplast ATP pools via pseudo-cyclic phosphorylation. As they became implicated in diverse stress responses, ROS subsequently gained a reputation as damaging molecules (Foyer & Noctor 2012)
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