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| Evaluation on Cold and Drought Resistance of 27 Woody Flower Species |
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| DOI：10.16768/j.issn.1004-874X.2020.08.006 |
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| Abstract: |
| 【Objective】The study was conduct to explore the physiological responses of different woody flower species under different drought and cold conditions, and a comprehensive assessment on the cold resistance and drought resistance of these species was performed in order to provide a reliable basis for the introduction and promotion of various species.【Method】The potted plants of 27 species belonging to 14 families were used as test materials. Large-scale lowtemperature artificial climate chambers were used for stage cooling and cold simulation. Polyethylene glycol 6000 solution was used to simulate different arid environments. The electrical conductivity and relative water content of plant leaves treated at different time points were measured, and the k-means clustering method was used to evaluate the cold and drought resistance of various species. Based on the measured physiological index data, TOPSIS method was used to comprehensively evaluate and rank the ability of cold and drought resistance.【Result】The results of cold resistance test showed that 15 species such as Camellia azalea and Brachychiton acerifolius had relatively strong cold resistance, the U value of the comprehensive evaluation of cold resistance was below 2.73. Species such as Handroanthus chrysanthus and Bombax malabaricum has relatively weak cold resistance. The results of drought resistance tests showed that 10 species such as Cassia siamea and Camellia azalea were more resistant to drought, the U value of comprehensive evaluation of drought resistance was below 2.30, while 17 species such as Cassia fi stula and Lysidice rhodostegia had weaker drought resistance.【Conclusion】There are significant differences in cold and drought resistance among 27 species, of which Camellia and Hematoxylin have better comprehensive resistance. The results provide a robust reference for the cultivation and promotion of various woody flower species. |
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