Changes in Metal Distribution, Vegetative Growth, Reactive Oxygen and Nutrient Absorption of Tagetes patula under Soil Cadmium Stress
2022
Hongzhou Shi | Yangmei Wang | Hong Chen | Fuxiang Deng | Yongan Liu | Guoxing Cao
Phytoremediation with hyperaccumulator plants has been recognized as a potential way for the clearing of cadmium (Cd)-contaminated soil. In this study, hyperaccumulator Tagetes patula was treated with seven concentrations of Cd, ranging from 0 to 300 mg kg&minus:1. The Cd enrichment and nutrient contents in different organs during different growth phases were investigated. Under Cd concentrations &le:75 mg kg-1, the morphological growth of T. patula did not change significantly regardless of growth stage. However, when Cd concentration exceeded 150 mg kg&minus:1, the morphological growth was remarkedly inhibited. The root/shoot ratio remained unchanged except for at 300 mg kg&minus:1. In addition, Cd negatively influenced the flowering process at the concentration of 300 mg kg&minus:1. Cd content increased significantly in Cd-treated plants. Nitrogen absorption was increased under Cd treatments, and phosphorus content was also increased under concentration &le:150 mg·:kg&minus:1. However, the potassium content in the flower was decreased under 300 mg kg&minus:1. Furthermore, the contents of H2O2, O2&minus: and malondialdehyde were increased during the seedling phase, especially when Cd concentration was &ge:150 mg kg&minus:1. In summary, T. patula showed a strong ability to tolerate Cd, and such ability might be explained by nutrient absorption and reactive oxygen clearness.
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