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Frequent pre-harvest fruit abscission occurs during the development of longan fruits due to insufficient carbohydrate supply. The metabolism of carbohydrates is closely related to energy metabolism, and changes in energy charge related respiration and carbohydrate consumption, which are important indicators for measuring fruit physiological functions. In order to reveal the relationship between abnormal abscission and energy charge of longan fruits, this study used the fruits of the late stage of development (80 days after flowering) of “Chu Liang” longan as the materials, and used ear girdling plus defoliation treatment to block carbohydrate supply and artificially create hunger stress, which can lead to complete fruit abscission within 5 days. During this process, this study analyzed the changes in ATP, ADP, and AMP contents and energy charge levels in different tissues during fruit abscission. The results showed that the energy charge values of different tissues in the fruit were as follows: seeds>fruit skin>fruit flesh, and with the intensification of starvation stress, during the fruit abscission process, ATP significantly decreased and AMP significantly increased throughout the experiment. The energy charge values of different tissues showed a downward trend, but the decrease in seed energy charge value was the smallest, and the seed was the organ with the most stable energy charge. The results indicated that starvation stress could lead to a decrease in fruit energy levels, but the magnitude of energy changes varied among different tissues, seeds could maintain relatively stable energy charge levels, suggesting that under starvation stress, fruit resources prioritized the supply of seeds, thereby maintaining the energy state.
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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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