Li Yan, Cheng Xiaomao, Feng Chengcheng, Huang Xiaoxia
Southwest Landscape Architecture Engineering Research Center of National Forestry and Grassland Administration, College of Landscape Architecture and Horticulture Sciences, Southwest Forestry University, Kunming 650224, China.
Toxics. 2023 Mar 16;11(3):271. doi: 10.3390/toxics11030271.
Potentially toxic elements (PTEs) pollution occurs widely in soils due to various anthropogenic activities. Lead (Pb) and cadmium (Cd) coexist in soil frequently, threatening plant growth. To explore the interaction effect between Pb and Cd in and the response of plant physiological characteristics to Pb and Cd stress, we designed a soil culture experiment. The experiment demonstrated that Pb stress improved leaf photosynthesis ability, while Cd stress inhibited it. Furthermore, Pb or Cd stress increased malonaldehyde (MDA) content, but plants were able to reduce it by increasing antioxidant enzyme activities. The presence of Pb could alleviate Cd phytotoxicity in plants by inhibiting Cd uptake and accumulation as well as increasing leaf photosynthesis and antioxidant ability. Pearson correlation analysis illustrated that the variability of Cd uptake and accumulation between Pb and Cd stress was related to plant biomass and antioxidant enzyme activities. This research will offer a new perspective on alleviating Cd phytotoxicity in plants.
由于各种人为活动，潜在有毒元素（PTEs）污染在土壤中广泛存在。铅（Pb）和镉（Cd）经常共存于土壤中，威胁着植物生长。为了探究Pb和Cd在土壤中的交互作用以及植物生理特性对Pb和Cd胁迫的响应，我们设计了一项土壤培养实验。实验表明，Pb胁迫提高了叶片光合作用能力，而Cd胁迫则抑制了该能力。此外，Pb或Cd胁迫均增加了丙二醛（MDA）含量，但植物能够通过提高抗氧化酶活性来降低MDA含量。Pb的存在可以通过抑制Cd的吸收和积累以及提高叶片光合作用和抗氧化能力来减轻植物体内Cd的毒性。Pearson相关性分析表明，Pb和Cd胁迫下Cd吸收和积累的变化与植物生物量和抗氧化酶活性有关。本研究将为减轻植物体内Cd的毒性提供新的视角。
