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Silicon(Si) is the only element which can enhance the resistance to multiple stresses. However, the role of silicon in medicinal plants under salt stress is not yet understood. This experiment was conducted to study the effects of silicon addition on the growth, osmotic adjustments, photosynthetic characteristics, chloroplast ultrastructure and Chlorogenic acid (CGA) production of Honeysuckle plant ( Lonicera japonica L. ) under salt-stressed conditions. Salinity exerted an adverse effect on the plant fresh weight and dry weight, whilst 0.5 g L −1  K 2 SiO 3 ·nH 2 O addition obviously improved the plant growth. Although Na +  concentration in plant organs was drastically increased with increasing salinity, higher levels of K + /Na +  ratio was obtained after K 2 SiO 3 ·nH 2 O addition. Salinity stress induced the destruction of the chloroplast envelope; however, K 2 SiO 3 ·nH 2 O addition counteracted the adverse effect by salinity on the structure of the photosynthetic apparatus. K 2 SiO 3 ·nH 2 O addition also enhanced the activities of superoxide dismutase and catalase. To sum up, exogenous Si plays a key role in enhancing its resistance to salt stresses in physiological base, thereby improving the growth and CGA production of Honeysuckle plant.

The role of silicon in physiology of the medicinal plant (Lonicera japonica L.) under salt stress