Department of Horticultural Sciences, Isfahan University of Technology, Isfahan, Iran.
Int J Phytoremediation. 2020;22(12):1259-1268. doi: 10.1080/15226514.2020.1759507. Epub 2020 May 12.
Despite the stabilized ornamental markets for scarlet sage (), little is known about the stress resistance of heavy metals (HMs). Therefore, a hydroponic study was conducted to determine whether the addition of Fe nanoparticles (Fe NPs) at 0, 5, 10, 20 and 30µM in Hoagland's nutrient solution reduce the toxicity caused by 100μM of HMs (Cd, Cu, Ni, Cr and Pb). Exposure to HMs significantly reduced relative growth rate (RGR), chlorophyll content, chlorophyll fluorescence (), total antioxidant activity (TAA), total phenol content (TPC) and antioxidant power assay (FRAP), while the malondialdehyde (MDA) accumulation, HO generation and electrolyte leakage (EL) significantly increased. Fe NPs improved HMs toxicity by significant reduction in MDA content, HO generation and EL while increase in the PGR, chlorophyll content, , the TAA, TPC and FRAP. Exposure to HMs caused Fe deficiency-induced chlorosis while Fe NPs reduced the negative effects of HM by preventing further reduction of leaf Fe. The results highlighted that although using Fe NPs significantly improved plant growth and motivated the plant defense mechanisms in response to HMs toxicity, it had a negative effect on the phytoremediation properties of by reducing the accumulation of HMs in plant organs.
尽管胭脂仙人掌的观赏市场已经稳定，但人们对重金属（HMs）的抗逆性知之甚少。因此，进行了一项水培研究，以确定在 Hoagland 营养液中添加 0、5、10、20 和 30µM 的 Fe 纳米颗粒（Fe NPs）是否可以减轻 100µM HMs（Cd、Cu、Ni、Cr 和 Pb）引起的毒性。暴露于 HMs 会显著降低相对生长率（RGR）、叶绿素含量、叶绿素荧光（）、总抗氧化活性（TAA）、总酚含量（TPC）和抗氧化能力测定（FRAP），而丙二醛（MDA）积累、HO 生成和电解质泄漏（EL）显著增加。Fe NPs 通过显著降低 MDA 含量、HO 生成和 EL，同时增加 PGR、叶绿素含量、、TAA、TPC 和 FRAP，改善了 HMs 毒性。暴露于 HMs 会导致缺铁引起的黄化，而 Fe NPs 通过防止叶片 Fe 的进一步减少来减轻 HM 的负面影响。结果表明，尽管使用 Fe NPs 显著改善了植物生长，并激发了植物对 HMs 毒性的防御机制，但它通过减少植物器官中 HMs 的积累，对植物修复特性产生了负面影响。
