Physiological response of Bidens pilosa to cadmium stress by Fourier Transform Infrared Spectroscopy

Abstract

Abstract In order to explore the tolerance mechanism of Bidens pilosa L. to cadmium (Cd), the physiological response and Cd accumulation characteristics of plants were studied after poisoning plants with Cd. The main results were as follows: B. pilosa seedlings were not damaged after Cd poisoning. The characteristic peak intensity of leaves was higher at high Cd concentration than at medium-low Cd concentration. The intensity of characteristic peaks of stems and roots was close to or higher than that of the control group. Cd accumulation in roots was significantly lower than that in shoots after Cd treatment. Cd accumulated in leaves, but was least distributed in chloroplasts and mitochondria, and mainly in cell walls. Therefore, B. pilosa has good endurance ability against Cd-contaminated soil and has good application potential in resolving Cd-polluted soil. The Fourier transform infrared (FTIR) method is more representative than conventional methods in identifying the treatment effect of heavy metals in terrestrial plants, which provides strong evidence for the development of phytoremediation technology.