The Effect of Exogenous IAA Treatment on the Color Quality and Antioxidant Activity of Postharvest Pak Choi
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Abstract:
In order to clarify the effects of exogenously applied indoleacetic acid (IAA) on postharvest pak choi and the mechanism of the effects, changes in chlorophyll content, chlorophyll metabolism-related gene expression and enzyme activities, IAA metabolic pathway-related gene expression, endogenous hormone content, and antioxidant-related gene expression and enzyme activities during postharvest pak choi senescence were investigated using distilled water spraying as a control group in this experiment. It was found that the colour quality of postharvest pak choi was effectively maintained and its leaf senescence was delayed by exogenous application of 2 mg/L IAA, mainly by reducing the expression of chlorophyll metabolism related genes (BrNYC1, BrNOL, BrPPH, BrPAO, BrSGR1, and BrSRG2) and enzyme activities (PPH, PAO, and MDcase) to delay the degradation of chlorophyll. Meanwhile, the expression of growth hormone signalling transduction pathway-related genes (BrARF2, BrARF7, BrARF19, BrGH3.5, BrGH3.12, and BrGH3.17) could be regulated by IAA to maintain endogenous IAA content in postharvest pak choi. In addition, the expression of antioxidant metabolism related genes (BrCAT, BrPOD, and BrSOD) was enhanced by IAA treatment to increase the antioxidant enzyme activities of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) and enhance the antioxidant properties of postharvest pak choi. In conclusion, exogenous IAA can effectively maintain the colour quality of pak choi and delay its leaf senescence, and the results of this study will provide a basis for the development of postharvest technology for pak choi.
