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Dendrobium is a class of ornamental plants native to tropical regions, suitable for cultivation in high temperature and high humidity environment, and susceptible to low temperature stress. To investigate the physiological response and cold tolerance of Dendrobium to low temperature stress, Dendrobium 'Sonia Hiasakul' mature (SH) were treated in temperature 15 ℃, 10 ℃ and 5 ℃ for 1 h, 2 h, 4 h, 8 h, and the physiological indexes and morphological changes of SH were surveyed 1 d, 2 d, 4 d, 8 d and 16 d after. The changes of physiological indexes included soluble protein, soluble sugar, free proline, malondialdehyde (MDA), chlorophyll content, electrical conductivity and the defoliation rate of the treated plants. Based on the relative conductivity of different temperature treatments, a Logistic equation was fitted to calculate the half-lethal temperature (LT50) of SH, and a correlation analysis between the half-lethal temperature at low temperature (LT50) and the physiological indexes of cold resistance was conducted, with the aim to investigate the morphological and physiological response characteristics of SH under different low temperature environment and to understand the pattern of its growth and development. The electrical conductivity, free proline, malondialdehyde (MDA) content and the defoliation rate of SH increased significantly with the extension of the stress time and the soluble protein and soluble sugar content fluctuated continuously, in a state of rising, falling, then rising again. The chlorophyll content decreased gradually, reaching the lowest 0.2534 mg/g treated at 5 ℃ for 16 d. Correlation analysis revealed that the free proline, malondialdehyde (MDA), defoliation rate and semi-lethal temperature were all highly significantly correlated and chlorophyll content and semi-lethal temperature were significantly correlated, and it was speculated that the content of the physiological indicators was related to the cold resistance characteristics of SH. The study would provide a theoretical basis for determining the cold tolerance identification index and dealing with cold damage in SH, and lay a foundation for further research on the resistance of Dendrobium hybrids to low temperature damage.
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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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