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In this study, Dahong pitaya fruit were treated with different concentrations of MT (0.2, 0.4, 0.8 mmol/L) and stored at (7±1) ℃ and 75%-85% RH to clarify the effect of MT on its preservation. The results showed that 0.2 and 0.8 mmol/L MT could decrease the rot rate (DI) of pitaya fruit, while MT could decrease the respiratory rate (RR) and inhibit the increase of relative conductivity (RC). 0.2 mmol/L MT could effectively delay the decrease of the content of ascorbic acid (AsA), inhibit the increase of the content of malondialdehyde (MDA) and the formation of hydrogen peroxide (H2O2) and superoxide anion (), and increase the activity of antioxidant enzymes (SOD, CAT, APX), effectively promote reactive oxygen species (ROS) metabolism, scavenging free radicals, improve fruit antioxidant capacity. At the same time, 0.2 mmol/L MT could effectively maintain the activity of disease-resistance-related enzymes (PAL, POD and PPO), and induce and improve the disease resistance of pitaya fruit. In addition, 0.2 mmol/L MT could increase the contents of soluble sugar (SS) and flavonoids, but there was no significant difference in weight loss rate (WLR) between CK and MT. The correlation analysis showed that there were significant correlations among the 19 indexes, and the rotting rate of pitaya fruit was closely related to ROS metabolism disorder and membrane peroxidation. The results of principal component analysis showed that the score of 0.2 mmol/L MT was higher than that of CK at all storage periods, and the cumulative comprehensive score of 0.2 mmol/L MT was the highest, indicating that the effect of 0.2 mmol/L MT was the best. In conclusion, 0.2 mmol/L MT could delay senescence and maintain quality of pitaya fruit by maintaining ROS metabolism balance and improving disease resistance. This study would lay a foundation for the further research and application of MT technology in hylocereus longus storage at low temperature.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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