Song Jun, Pi Boyi, Dai Jingtong, Nie Zhi, Yu Guirong, Du Wenping
Institute of Biotechnology and Nuclear Technology, Sichuan Academy of Agricultural Sciences, Chengdu, China.
College of Life Science, Sichuan University, Chengdu, China.
Int J Phytoremediation. 2025;27(7):888-895. doi: 10.1080/15226514.2025.2455483. Epub 2025 Jan 21.
The increasing prevalence of cadmium (Cd)-contaminated agricultural soils threatens the safe production of maize ( L.). To decrease the Cd accumulation in maize, a pot experiment was conducted to study the effects of humic acid on the growth and Cd uptake of maize seedlings. Cd treatment led to a decrease in biomass and photosynthetic pigment content in maize seedlings, as well as an increase in the activities of antioxidant enzymes. Under Cd stress, the application of humic acid resulted in an increase in biomass, photosynthetic pigment content, and antioxidant enzyme activity in maize seedlings. Additionally, the application of humic acid led to a decrease in root Cd content and an increase in shoot Cd content and translocation factor in maize seedlings under Cd stress. Compared to Cd treatment, humic acid reduced root Cd content by 14.63% and increased shoot Cd content by 12.81%. Furthermore, the carotenoid content, translocation factor, chlorophyll + content, and chlorophyll content were strongly associated with shoot Cd content under Cd stress. Therefore, the application of humic acid can enhance growth, inhibit Cd uptake in roots, and promote Cd translocation from roots to shoots of maize seedlings under Cd stress.
镉（Cd）污染农田土壤的日益普遍威胁着玉米（Zea mays L.）的安全生产。为了减少玉米中的镉积累，进行了盆栽试验，以研究腐殖酸对玉米幼苗生长和镉吸收的影响。镉处理导致玉米幼苗生物量和光合色素含量降低，以及抗氧化酶活性增加。在镉胁迫下，施用腐殖酸导致玉米幼苗生物量、光合色素含量和抗氧化酶活性增加。此外，在镉胁迫下，施用腐殖酸导致玉米幼苗根镉含量降低，地上部镉含量和转运系数增加。与镉处理相比，腐殖酸使根镉含量降低了14.63%，地上部镉含量增加了12.81%。此外，在镉胁迫下，类胡萝卜素含量、转运系数、叶绿素a+b含量和叶绿素a含量与地上部镉含量密切相关。因此，在镉胁迫下，施用腐殖酸可以促进玉米幼苗生长，抑制根系对镉的吸收，并促进镉从根系向地上部的转运。
