In the medium - high altitude areas, this paper studied the sensitivity and tolerance of three flue - cured tobacco varieties (Yunyan 87, Yunyan 97 and Zhongyan 103) with different seedling - ages to low temperature at seedling stage. The results showed that the seedlings of Yunyan 97 had the strongest sensitivity to low temperature, followed by those of Yunyan 87. The response of Zhongyan 103 to low temperature was complex with a opposite pattern. Meanwhile, the sensitive seedling - age of Yunyan 97 to low temperature ranged from 45 days to 55 days. In a word, it was necessary to choose proper variety and reinforce the preventive and remedial measures to early flowering based on the characteristics of early flowering in the production.%以中高海拔烟区不同品种和苗龄烤烟为对象,研究了云烟87、云烟97和中烟103对苗期低温的敏感性,分析了不同苗龄对苗期低温的耐受性,结果表明:云烟97和云烟87属于苗期对低温敏感性较强的品种,云烟97的敏感性最强,云烟87次之,而中烟103对低温的反应较复杂,表现出相反的规律；云烟97对低温敏感的苗龄范围是45 ～55 d,因此在生产上应根据早花发生的特性,合理选择品种,加强早花的预防及补救措施.
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