Promoting effect of low-dose ultraviolet-C Irradiation on wound healing of postharvest potato tubers
In order to investigate the promotion effect and biochemical mechanism of ultraviolet-C(UV-C)irradiation on wound healing of postharvest potato tubers,artificially injured potato tubers(Yutian 806)were treated with different low doses(0.1,0.3,0.5 kJ/m2)of UV-C irradiation.The wound healing effect of UV-C was evaluated by measuring the changes of quality index and the key biochemical indexes during wound healing.It was found that 0.3 kJ/m2 and 0.5 kJ/m2 UV-C irradiation could accelerate the decay of the wounded potato in the later stage of healing,while no decay occurred in potatoes of 0.1 kJ/m2 group and CK group throughout the healing period.In addition,UV-C irradiation could effectively increase the content of total phenols and flavonoids at the wound site of tubers by increasing phenylalanine ammonia lyase(PAL)activity.In addition,UV-C significantly accelerated the accumulation and deposition of lignin and suberin at the wound site of potato tuber by promoting peroxidase(POD)activity and H2O2 content,thus accelerating the wound healing and maintaining lower weight loss and higher firmness.Overall,UV-C irradiation can promote wound healing of potato tuber,which provides a theoretical basis for the development of novel potato healing technology.
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