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.

中文翻译：

---

生长早期铅胁迫条件下玉米植株对硫氢化钠预处理的响应

铅污染是一种主要的环境压力，对植物和其他生物体具有严重的毒性。在本研究中，研究了硫氢化钠对暴露于铅胁迫的玉米植株的影响。玉米种子在 0.5 mM 硫氢化钠 (NaHS) 中浸泡 12 小时，然后暴露于铅 (2.5 mM Pb(NO3)2) 中 9 天。铅排放导致 Pb 积累、水分胁迫诱导、生长抑制、氧化参数急剧增加，同时降低了玉米植物的叶绿素含量和养分吸收。数据表明，NaHS 预处理可减轻铅毒性。由 NaHS 控制的耐受性提高可归因于其减少铅吸收和调节矿物质营养、调节根解剖结构变化的能力，