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Cibotium barometz, a nationally second-class protected plant in China, exhibits significant medicinal and ornamental value. It is naturally distributed in the southern regions of China and exhibits stringent requirements for its growth environment. Investigating the physiological response mechanisms of C. barometz to low-temperature stress can provide a scientific foundation for its artificial cultivation and the comprehensive development and utilization of its resources. This study utilized artificially cultivated C. barometz as the experimental material and established three temperature levels: 5 ℃, 15 ℃ and 25 ℃. Each temperature level was subjected to treatments lasting 5 days, 10 days, and 15 days, respectively. Following the stress treatment, chlorophyll fluorescence parameters, physiological indicators, and total flavonoid content in the leaves were measured. The growth and physiological characteristics of C. barometz under different temperature conditions were analyzed based on the experimental results. The results indicated that following exposure to 5 ℃ and 15 ℃, the photosynthetic capacity of C. barometz leaves significantly decreased, whereas the activities of superoxide dismutase (SOD) and peroxidase (POD) markedly increased. In contrast, no significant differences were observed in the levels of free proline (Pro) and soluble sugars. After 15 days of treatment at 5 ℃, the malondialdehyde (MDA) content in the leaves of C. barometz significantly increased. Proper low-temperature treatment significantly enhanced the accumulation of total flavonoids in the leaves of C. barometz. On the 10th day of treatment at 5 ℃and 15 ℃, the total flavonoid content reached 688.78% and 511.01% of that in the 25 ℃ treatment group, respectively, representing the highest levels observed. This study demonstrated that low-temperature stress exerts differential effects on various physiological indicators in C. barometz. The activities of SOD and POD, and the total flavonoid content, can serve as key indicators for evaluating the cold tolerance of C. barometz seedlings. Temperatures of 15 ℃ and below can significantly reduce the photosynthetic capacity of C. barometz, leading to abiotic stress and a marked increase in the total flavonoid content in its leaves. This result could provide an important reference for optimizing temperature control conditions in the artificial cultivation of. C. barometz.
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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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