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| Analysis on Photosynthetic Characteristics and Carbohydrate Content of Feizixiao Litchi Leaves in Different Phenological Periods |
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| DOI：10.16768/j.issn.1004-874X.2020.08.004 |
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| Abstract: |
| 【Objective】The study was conducted to understand the changing trend of photosynthetic characteristics and carbohydrate contents of Feizixiao litchi leaves in different phenological periods with a view to provide a theoretical basis for the high-yield cultivation management of Feizixiao litchi.【Method】The phenological period of Feizixiao litchi was observed for three consecutive years. The changes in photosynthetic characteristics and carbohydrate content of litchi leaves in different phenological periods were studied. CIRAS-3 portable plant photosynthesis analyzer was used to determine leaf photosynthesis parameters. Soluble sugar was measured by anthrone-sulfuric acid method and starch was measured by iodometric method.【Result】The net photosynthetic rate of the leaves of Feizixiao litchi showed a wave-like change, with the
highest value of 13.04 μmol/m2·s after the shoots were fully mature and the lowest value of 4.73 μmol/m2·s during the fruit coloring stage. The chlorophyll content showed an overall upward trend during the growth period, and its maximum value was 5.2 mg/g. The soluble sugar content showed a wave-like change, with a relatively high level at the flower bud differentiation stage. The soluble sugar content reached the highest value of 42 mg/g after the physiological fruit-drop period, and the lowest value of 16 mg/g appeared at the fruit maturation period. The starch content showed an upward trend during the flower bud differentiation period, the highest value of 237 mg/g appeared at the white millet period while the content fell to the lowest value of 102 mg/g at the physiological fruit-drop period, and then gradually recovered.【Conclusion】During the whole process from flower bud differentiation to fruit maturity, there were two peaks in the net photosynthetic rate of leaves, which appeared in the flower bud differentiation and fruit development periods. There were large accumulations of soluble sugar contents in the fruit development period and fruit coloring period, and large accumulations of starch contents in the flower bud differentiation period and fruit
coloring period, which provided adequate nutrition for the subsequent growth and development. During the whole process, the leaves showed no obvious chlorosis. |
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