Impacts of Cd on Temporal Dynamics of Nutrient Distribution Pattern of Bletilla striata, a Traditional Chinese Medicine Plant

Bletilla striata is an endangered medicinal plant the habitats of which are polluted by cadmium (Cd). Nutrient management a potential way to mitigate Cd toxicity, providing reference for B. artificial cultivation. Pot experiments were undertaken examine effect five levels concentration (control: 0.28 mg/kg; I: 0.37 II: 1.00 III: 7.39 IV: 54.6 mg/kg) on temporal dynamics nutrient allocation in components. The results showed that content and accumulation increased significantly all tissues as was increasing, most accumulated roots slightly transferred aboveground parts, while tubers less likely accumulate Cd. Excessive under long-term exposure reduced biomass striata, yield not affected when cultivated soil with ? 1 mg/kg. Potassium (K) quickly from root other response stress. absorption zinc (Zn) at first then decreased concentration. According Pearson correlation analysis, mechanism suggested affects nutrients but positively correlated translocation factor K Zn tuber. This may imply tends promote elements adapt enrichment compensate interrupted mineral nutrition metabolism.