Abstract:

In order to research the frost resistance of Chinese orchid varieties, screen out the frost resistant varieties, the dynamic changes of Pro, soluble sugar, soluble protein content and semi-lethal temperature were studied through the artificial low temperature processing. The relationship between them and the frost resistance, and a comprehensive evaluation on frost resistance of Chinese orchid varieties was given based on subordinate function values analysis. The results showed that: With the deepening of frost stress level, the content of pro, soluble sugar, soluble protein was reduced after the first increase. The semi-lethal temperature of leaves was ‘Song Mei’< ‘New Shanghai’< ‘Lao Jipin’< ‘Ji Yuan’< ‘Da Yipin’, a comprehensive evaluation on the ability of frost resistant of the Chinese orchid varieties was ‘Xin Shanghai’> ‘Da Yipin’> ‘Ji Yuan’> ‘Lao Jipin’> ‘Song Mei’.