Influences of low dose short wave ultraviolet (UV-C) on the preservation of dragon fruit and its action mechanisms were studied for providing scientific basis of UV-C application in dragon fruit storage. The test material was ‘Jindu’ dragon fruit and common ultraviolet germicidal lamp with wavelength of 254 nm was used as the radiation source. The dragon fruits were irradiated with the radiation dose of 0, 1.0, 2.0, 3.0, 1.0 kJ·m–2, respectively. Then we conducted the experiment that the optimal dose of UV-C was selected by measuring the decay rate, electrical conductivity and TSS content of the dragon fruit. Dragon fruits treated with optimal dose of UV-C were stored under the condition of 22±1 ℃. Water loss rate, H2O2 content and defensive enzyme activity were measured periodically during storage. Different doses of UV-C treatment effectively inhibited the rot of dragon fruit and the increase in electrical conductivity, and reduced the TSS content in dragon fruit. 1.0 kJ·m–2 UV-C treatment had the best effect with significantly increasing of SOD and CAT activities in dragon fruit during the whole storage period, and significantly improving to chitinase and PPO activities in the early and middle storage period. The β-1,3-glucanase activity in the late storage period was also significantly higher than that of the control. But it reduced the POD activity in the middle storage period (the 6th day). In addition, 1.0 kJ·m–2 UV-C also significantly increased the H2O2 content during storage (except for the 6th day), and had no effect on the water loss rate of the fruit.
LUO En-xi
,
LI Zhen-qin
,
HONG Ke-qian
,
SONG Kang-hua
,
LIANG Yong-kang
,
WANG Jun-ning
. Effect of UV-C Irradiation on Preservation of Hylocereus polyrhizus ‘Jindu’ Fruits[J]. Subtropical Plant Science, 2021
, 50(05)
: 353
-359
.
DOI: 10.3969/j.issn.1009-7791.2021.05.004
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