The effects of various CaCl2 concentrations on the physiological and growth responses of <i>Asarin Scandens Rose</i> under salt stress

Asarin Scandens Rose ("F499") is a perennial vine that is visually appealing, yet the salinization of the soil due to urban activity may reduce its potential as a landscaping plant. Our research utilized exogenous calcium to diminish the negative effects of salt stress on the growth of F499. Under salt stress, the application of 5 and 10 m m CaCl2 resulted in a considerable expansion of the leaf area, in addition to a heightened deposition of chlorophyll, thus improving the color of the leaves. Additionally, it was shown that F499's net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr), proline, and soluble protein levels all increased under the beneficial effects of CaCl2. Consequently, supplementation with appropriate amounts of exogenous calcium in urban saline soils is an effective way for plants to adapt to salt stress and maintain their ornamental value.