College of Resources and Environment, Southwest University, Chongqing, 400715, China.
College of Resources and Environment, Southwest University, Chongqing, 400715, China.
Chemosphere. 2024 Sep;364:143150. doi: 10.1016/j.chemosphere.2024.143150. Epub 2024 Aug 23.
Agricultural soils are currently at risk of pollution from toxic heavy metal(loid)s (HMs) due to human activities, resulting in the excessive accumulation of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), mercury (Hg), manganese (Mn), lead (Pb) and zinc (Zn) in food plants. This poses significant risks to human health. Exogenous selenium (Se) has been proposed as a potential solution to reduce HMs accumulation in plants. However, there is currently a lack of comprehensive quantitative overview regarding its influence on the accumulation of HMs in plants. This study utilized meta-analysis to consolidate the existing knowledge on the impact of Se amendments on plant HMs accumulation from contaminated soil media. The present study conducted a comprehensive meta-analysis on literature published prior to December 2023, investigating the effects of different factors on HMs accumulation by meta-subgroup analysis and meta-regression model. Se application showed an inhibitory effect on plant uptake of Hg (28.9%), Cr (25.5%), Cd (25.2%), Pb (22.0%), As (18.3%) and Cu (6.00%) concentration. There was a significant difference in the levels of HMs between treatments with Se application and those without Se application in various plant organs. The percentage changes in the HMs contents of the organs varied from -13.0% to -22.0%. Compared with alkaline soil (pH > 8), Se application can reduce more HMs contents in plants in acidic soil (pH < 5.5) and neutral soil (pH = 5.5-8). For daily food plants(e.g. rice, wheat and corn), Se application can reduce HMs contents in Oryza sp., Triticum sp. and Zea sp., ranging from 14.0-20.0%. Our study emphasizes that the impact of Se on reducing HMs depends on the single or combined effects of Se concentration, plant organs, plant genera and soil pH condition.
农业土壤目前由于人类活动而面临有毒重金属（loid）污染的风险，导致砷（As）、镉（Cd）、铬（Cr）、铜（Cu）、铁（Fe）、汞（Hg）、锰（Mn）、铅（Pb）和锌（Zn）在食用植物中过度积累。这对人类健康构成重大威胁。外源硒（Se）已被提议作为减少植物中 HMs 积累的一种潜在解决方案。然而，目前缺乏关于 Se 对植物中 HMs 积累影响的综合定量综述。本研究利用荟萃分析综合了关于 Se 改良剂对受污染土壤介质中植物 HMs 积累影响的现有知识。本研究对截至 2023 年 12 月之前发表的文献进行了全面的荟萃分析，通过亚组分析和荟萃回归模型对不同因素对 HMs 积累的影响进行了研究。Se 的应用对植物对 Hg（28.9%）、Cr（25.5%）、Cd（25.2%）、Pb（22.0%）、As（18.3%）和 Cu（6.00%）浓度的吸收有抑制作用。施用 Se 的处理与未施用 Se 的处理在不同植物器官中的 HMs 水平存在显著差异。器官中 HMs 含量的变化百分比从-13.0%到-22.0%不等。与碱性土壤（pH>8）相比，Se 的应用可以减少酸性土壤（pH<5.5）和中性土壤（pH=5.5-8）中植物更多的 HMs 含量。对于日常食用植物（如水稻、小麦和玉米），Se 的应用可以降低 Oryza sp.、Triticum sp. 和 Zea sp.中的 HMs 含量，范围从 14.0-20.0%。我们的研究强调，Se 减少 HMs 的影响取决于 Se 浓度、植物器官、植物属和土壤 pH 条件的单一或综合作用。
