Response of maize plant to sodium hydrosulfide pretreatment under lead stress conditions at early stages of growth

Zanganeh, Roya and Jamei, Rashid and Rahmani, Fatemeh (2021) Response of maize plant to sodium hydrosulfide pretreatment under lead stress conditions at early stages of growth. CEREAL RESEARCH COMMUNICATIONS, 49 (2). pp. 267-276. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

Lead contamination is a major environmental stress imposing serious toxicity to plants and other living organisms. In the present study, the effects of sodium hydrosulfide were investigated on maize plants exposed to lead stress. Maize seeds were soaked in 0.5 mM sodium hydrosulfide (NaHS) for 12 h and then exposed to lead (2.5 mM Pb(NO3)2) for 9 days. Lead imposition caused Pb accumulation, water stress induction, growth inhibition, sharp increases in oxidative parameters with reduction in chlorophyll content and nutrients uptake in maize plants. Data indicate that NaHS pretreatment conferred mitigation of lead toxicity. The improved tolerance governed by NaHS could be attributed to its ability to reduce lead uptake and regulation of mineral nutrition, modulation of root anatomical structure changes, induction of antioxidant system and protective compounds contents such as soluble sugar, glutathione, ascorbic acid and total phenol.

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