Changes in Storage Quality and Endogenous Hormones of Pitaya after the Treatment with Gibberellin-chitosan Combination
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Abstract:
The preservation effect of the treatment with gibberellin-chitosan combination on postharvest pitaya and the changes in endogenous hormones were investigated in this study. 'Jindu No.1' pitaya was used as the test material, and the storage quality and endogenous hormone content of postharvest pitaya were regularly measured after the treatment with the combination. The results showed that the preservation effect of the treatment with 50 mg/L gibberellin+chitosan was the best. After 12 days of storage, compared with the control, the decay index, bract yellowing rate, and weight loss rate of the treated pitaya were reduced by 55.56%, 15.91%, and 20.75%, respectively, the contents of its total soluble solids (TSS), betaine and vitamin C (Vc) increased by 17.76%, 24.70%, and 17.85%, respectively, and its total antioxidant capacity (T-AOC) and total phenolic content also increased. After 9 days of storage, compared with the control, the endogenous hormone content of the treated pitaya changed the most, with its abscisic acid (ABA) content decreasing by 1 436.1 ng/g, and its contents of gibberellin (GA4) and auxin (IAA) increasing by 0.29 ng/g and 192.3 ng/g, respectively. It can be seen that the treatment with 50 mg/L gibberellin+chitosan can maintain the metabolic balance of endogenous hormones in pitaya, improve the antioxidant capacity of pitaya and delay the decline of storage quality, ripening and senescence of pitaya. Thus, the treatment with the combination can be used as a green and environmentally friendly approach for postharvest storage and preservation of pitaya.
