Abstract:

The effect of preharvest spraying treatment with gibberellic acid (GA) at doses of 0.1, 0.5, 1.0 and 2.0 g/L on the
storage quality and postharvest physiology of ‘Hongguifei’ mango fruits was investigated. The results showed that compared
with control fruits, the fruits treated with 0.5 and 1.0 g/L GA showed lower disease index, relative conductivity and MDA
content, and exhibited slower changes in the contents of total soluble solid (TSS), vitamin C (VC) and titratable acid (TA),
and higher fruit firmness. The a* value in fruits treated with 2.0 g/L GA changed slowly and was maintained at the lowest
level during the whole storage time, and on the 30th day was decreased by 18.7, 17.5, 12.5 and 5.1 as compared to control
fruits and those treated with 0.1, 0.5 and 1.0 g/L GA, respectively (P < 0.01). These results indicated that treatments with
0.5 and 1.0 g/L GA were suitable for delaying the physiological changes and maintaining the storage quality of ‘Hongguifei’
mango fruits, but 2.0 g/L GA could result in incomplete changes in peel color until ripening, which had negative influence
on the appearance and quality.

Key words: gibberellic acid (GA), mango, storage quality, postharvest physiology