Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality (Guangzhou), Ministry of Agriculture and Rural Affairs, China; Hubei Provincial Engineering Laboratory for New-Type Fertilizer, China; Microelement Research Center for Huazhong Agricultural University, China.
Public Monitoring Center for Agro-Product of Guangdong Academy of Agricultural Sciences, China; Key Laboratory of Testing and Evaluation for Agro-product Safety and Quality (Guangzhou), Ministry of Agriculture and Rural Affairs, China; Microelement Research Center for Huazhong Agricultural University, China.
Ecotoxicol Environ Saf. 2020 Jul 1;197:110621. doi: 10.1016/j.ecoenv.2020.110621. Epub 2020 Apr 15.
Antimony (Sb) excess accumulation in edible parts of crops causes potential risks to human health. However, knowledge about the mechanisms of its accumulation within vegetable plants is still not well known. Here, we investigated the physiological processes of Sb involved in symplastic and apoplastic absorption, compartmentation by roots, and translocation in xylem in Brassica parachinensis L. exposed to antimonate (SbV) and antimonite (SbIII) forms. The results showed that plants treated with SbIII emerged to be more toxic than SbV as proved by the lower biomass and the higher concentrations of malonaldehyde (MDA) and hydrogen peroxide (HO) in plant tissues, especially at high dosages. The Sb concentration showed more in shoots but less in roots treated with SbV than with SbIII. The total Sb accumulation was higher under the SbV treatment than the SbIII treatment, mainly due to the higher accumulation in shoots. Additionally, the Sb concentration in symplastic flow of roots was higher exposed to SbV than SbIII, while no differences were found for the Sb concentration in apoplastic flow between them. Moreover, the Sb concentration in cell walls of roots was higher exposed to SbIII than SbV, especially at high levels. Furthermore, the Sb concentration in xylem was higher exposed to SbV than SbIII, and a greatly positive correlation was observed between the Sb concentrations in xylem and shoots. Overall, these findings revealed that vegetable plants accumulated more SbV than SbIII in edible parts mainly due to xylem translocation rather than root absorption.
锑（Sb）在农作物可食用部分的过度积累会对人类健康造成潜在风险。然而，关于其在蔬菜植物体内积累的机制的知识仍不为人知。在这里，我们研究了 Sb 在 Brassica parachinensis L. 根系吸收、区室化和木质部转运过程中的生理过程，该植物暴露于 SbV 和 SbIII 两种形式的锑。结果表明，SbIII 处理的植物比 SbV 处理的植物毒性更大，这体现在植物组织中生物量更低，丙二醛（MDA）和过氧化氢（HO）浓度更高，尤其是在高剂量时。SbV 处理的植物地上部分 Sb 浓度更高，但根部 Sb 浓度较低；SbV 处理的植物总 Sb 积累量高于 SbIII 处理，这主要是由于地上部分 Sb 积累量较高。此外，根部共质流中 Sb 浓度 SbV 处理高于 SbIII 处理，而它们在质外体流中的 Sb 浓度无差异。另外，根部细胞壁中 Sb 浓度 SbIII 处理高于 SbV 处理，尤其是在高浓度时。此外，木质部中 Sb 浓度 SbV 处理高于 SbIII 处理，并且木质部和地上部分 Sb 浓度之间存在显著正相关。总体而言，这些发现表明，蔬菜植物在可食用部分积累的 SbV 多于 SbIII，这主要是由于木质部转运而不是根部吸收。
