Abstract: This paper reported on a study of the changes of total flavonoids under salt stress in triploid Salvia miltiorrhiza Bunge to provide a theoretical support for its cultivation in saline-alkali soil. In this experiment, the treatments of different concentrations of NaCl solution（0, 30, 60, 90, 120, 150, 180 mmol/L）were employed to detect dynamic changes of total flavonoids in rhizomes and leaves of S. miltiorrhiza. The results showed that trends of total flavonoids in leaves showed “double-peak curve” with the increase of salt concentration, and the two peaks occurred in the treatments with salt concentrations of 60 mmol/L and 120 mmol/L; there was no significant changes of total flavonoids in leaves observed in the same concentration with the increasing treatment time. The total flavonoids of rhizomes increased and then decreased with the increase of the concentration of NaCl, and the peak value occurred when the salt concentration was between 60 to 90 mmol/L. The results suggested that triploid Salvia miltiorrhiza has a certain salinity resistance, and low concentration of NaCl can promote the increase of total flavonoids in rhizomes and leaves of triploid salvia miltiorrhiza.

Key words: salt stress, triploid, Salvia miltiorrhiza Bunge, total flavonoids