Effect of Postharvest Gibberellic Acid Treatment on the Chilling Injury of Tomato Fruits during Cold Storage
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Abstract:
The effect of exogenous gibberellic acid (GA3) treatment on chilling stress tolerance of harvested tomato fruits was investigated in this study. Solanum lycopersicum L. ‘Zhefen’ No. 702 at the mature green stage was used as the test material, treated with 0, 0.2, 0.5, or 1 mM GA3 aqueous solution at room temperature, and stored at 4 ℃. Tomato samples were collected on days 0, 3, 7, 14, 21, and 28, and stored at room temperature for three days before the chilling injury index was measured to determine the most suitable GA3 concentration. In addition, microstructure changes, malondialdehyde (MDA) content, electrolyte leakage, and changes in the activities of phospholipase C (PLC), phospholipase D (PLD), lipoxidase (LOX), and polygalacturonase (PG) were measured. These results showed that compared with the control, 0.5 mM exogenous GA3 treatment effectively alleviated the chilling injury symptoms, protected cellular microstructure, and significantly inhibited increases in the MDA content, electrolyte leakage, and activities of PLC, PLD, LOX, and PG, thus enhancing the chilling stress tolerance of postharvest tomato fruits.
