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The study was aimed to study the effects of exogenous ATP and rotenone treatment on chilling injury and sugar metabolism in cold-stored guava fruits. Post-harvest ‘Hongxiang’ guava fruits were treated with distilled water, 0.8 mmol/L ATP, and 0.2 mmol/L rotenone, respectively, and stored at (4±1)℃. During storage, the chilling injury index, commercial rate, sugar content, and sugar metabolism-related enzyme activity of the guava fruits were regularly determined. Compared with the control fruit, ATP treatment reduced chilling injury, increased the activities of sucrose monophosphate synthase (SPS), acid invertase (AI), and sucrose synthase synthesis direction (SSs) during the late stage of storage, decreased the activities of neutral invertase (NI) and sucrose synthase decomposition direction (SSc) during late-storage, inhibited the increase in fructose and glucose content during mid-storage, maintained the content of sucrose and total soluble sugar at a high level, and improved the cold resistance and commercial rate of the fruit. Rotenone treatment exacerbated chilling injury by simultaneously inhibiting the increase of SSS activity and SPS activity during the middle stage of storage, the decrease of AI activity, NI activity, and SSc activity during the middle and late stages of storage, accelerating the decomposition of sucrose, increased the content of fructose, reduced the total soluble sugar and reducing sugar, and resulted in a low commercial rate of the fruit. ATP treatment could enhance cold resistance in guava fruits, and the mechanism may be related to changes in sucrose and soluble total sugar content. However, rotenone treatment induced an imbalance in sugar metabolism and exacerbated chilling injury.
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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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