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Photosynthesis plays a crucial role in the growth and development of plants, and the light response curve can describe the relationship between photosynthetic rate and light intensity under different light conditions. As a thermocrop plant, clarifying the photosynthetic characteristics of Noni is crucial for understanding its growth and development process, while there are relatively few reports on the photosynthetic aspects of Noni. In order to study the photosynthesis of Noni and its environmental adaptation, this study took Noni with four shade treatments (CK, T1, T2, T3) as the research object, and measured the daily change of light intensity, daily change of net photosynthesis and light response curve by LI-6400 portable photosynthesizer, and used four commonly used light response models to fit, and then screened the optimal model to obtain the corresponding photosynthetic characteristic parameters. The daily change of light intensity showed a single-peak parabolic trend, and the daily light intensity reached the maximum at 12∶00 noon, while the daily change of net photosynthesis of Noni showed an inverted U-shaped change, with a rapid increase from 6∶00 to 10∶00, and a slow decline from 10∶00 to 16∶00, and a rapid decline at 16∶00. The daily changes of the two existed some synchronous and non-synchronous changes. The net photosynthetic rate (Pn) and light intensity (I) both showed obvious decreasing trends with the increase of shade between different treatments. The modified model of the right-angle hyperbola (MRHM) fit most effectively for the light response curve of Noni. With the exception of 90% shade, both the root mean square error (RMSE) and mean absolute error (MAE) were lower than those of the other three models, ranging from 0.06 to 0.12 and 0.05 to 0.09, respectively. With the increase of shade, the photosynthetic apparent quantum efficiency (AQE), maximum net photosynthetic rate (Pnmax), light saturation point (LSP) and dark respiration rate (Rd) of Noni gradually decreased, while the light compensation point (LCP) gradually increased, indicating that under the induction of low light, the photosynthetic efficiency of Noni gradually decreased, and the photosynthetic efficiency of Noni gradually decreased when over-shaded. This indicates that the photosynthetic efficiency of noni decreases gradually under low light induction, and even decreases dramatically under excessive shade, and its high photosynthetic efficiency can only be activated under strong light stimulation. This study reveals the photosynthetic characteristics of Noni and its response strategy to different shade, which would provide a theoretical basis for the deep understanding of Noni ecological adaptation, and also provide a reference for the production of Noni understory planting or shade measures.
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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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