Abstract:

【Objective】 In order to explain the mechanism on the roles of salicylic acid in plant physiology and development, tissue culture plants of strawberry were used to explore the possible interactions between SA and iron. 【Method】 SA at a series of concentrations (0.05-0.8 mmol?L-1 ) was applied to the medium with a series of concentrations (0.05-0.8 mmol?L-1 ) of iron. Plant growth and the activities of some iron enzymes were measured. 【Result】 The plants were shown to be more sensitive to SA in the medium with lower concentrations of iron than higher ones. The optimal concentrations of SA for plant growth increased gradually along with the increase of iron concentrations in the medium. SA usually inhibited root elongation. Low concentrations of SA increased the plant height and chlorophyll content while high concentrations of SA reduced these indices. Higher concentration of SA at 0.4 mmol?L-1 injured the plants, but such injury became less with the increase of the concentration of iron. The activities of CAT and ACO were enhanced by SA at the concentrations of 0.05-0.2 mmol?L-1 while reduced at 0.4 mmol?L-1. POD activity was increased by SA at 0.05-0.4 mmol?L-1. 【Conclusion】 SA and iron have close relationship in regulating the growth of strawberry.

Key words: strawberry')">strawberry, salicylic acid, iron, chlorophyll, catalase, peroxidase, aconitase