Changes in Metal Distribution, Vegetative Growth, Reactive Oxygen and Nutrient Absorption of <i>Tagetes patula</i> under Soil Cadmium Stress
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 <i>Tagetes patula</i> was treated with seven concentrations of Cd, ranging from 0 to 300 mg kg<sup>−1</sup>. The Cd enrichment and nutrient contents in different organs during different growth phases were investigated. Under Cd concentrations ≤75 mg kg<sup>-1</sup>, the morphological growth of <i>T. patula</i> did not change significantly regardless of growth stage. However, when Cd concentration exceeded 150 mg kg<sup>−1</sup>, the morphological growth was remarkedly inhibited. The root/shoot ratio remained unchanged except for at 300 mg kg<sup>−1</sup>. In addition, Cd negatively influenced the flowering process at the concentration of 300 mg kg<sup>−1</sup>. Cd content increased significantly in Cd-treated plants. Nitrogen absorption was increased under Cd treatments, and phosphorus content was also increased under concentration ≤150 mg·kg<sup>−1</sup>. However, the potassium content in the flower was decreased under 300 mg kg<sup>−1</sup>. Furthermore, the contents of H<sub>2</sub>O<sub>2</sub>, O<sup>2−</sup> and malondialdehyde were increased during the seedling phase, especially when Cd concentration was ≥150 mg kg<sup>−1</sup>. In summary, <i>T. patula</i> showed a strong ability to tolerate Cd, and such ability might be explained by nutrient absorption and reactive oxygen clearness.
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