RESISTANCE AND UPTAKE CHARACTERISTICS OF THREE GENOTYPES DIANTHUS CARYOPHYLLUS TO CHROMIUM CONTAMINATION OF TAILINGS SOILS.

To investigate the physiological response and uptake characteristics of three genotypes of Dianthus caryophyllus to Cr stress, we used a heavy metal-contaminated soil sample from a lead-zinc mine in a pot trial to determine several parameters, including plant height, stem thickness, root architecture, biomass, heavy metal accumulation and transport capacity under different levels of Cr contamination. We discovered a dosage effect in the influence of the heavy metal Cr on the growth of Dianthus caryophyllus. Under low-dose conditions, it elicited a protective response favoring plant growth, whereas under high accumulation conditions, it inhibited plant growth. Additionally, chromium stress increased the growth of plant roots. In the range of chromium concentrations between 0-100 mg/kg, the enrichment and transit coefficient of the three species, namely Freedom, Master, and Dallas decrease as the concentration of chromium increases. The enrichment coefficient follows the order Freedom > Dallas > Master, whereas the transit coefficient follows the order Master > Freedom > Dallas. All three genotypes of Dianthus caryophyllus exhibited tolerance, accumulation, and transport capacities when subjected to chromium stress. As a result, they can serve as reference plants for on-site remediation of heavy metals in soils contaminated with tailings in mining regions. [ABSTRACT FROM AUTHOR]