High-quality tobacco leaf production is greatest between 22 and 25 ☌. The most suitable temperature in the field growth phase of tobacco is between 22 and 28 ☌ and the temperature should not be lower than 20 ☌ in the mature period. Therefore, tobacco is suitable to be studied as a model plant for crops subjected to cold stress. The growth of tobacco plants is restricted at the temperature lower than 10 to 13 ☌ and plants will die when the temperature drops to 2 to 3 ☌. Tobacco ( Nicotiana tabacum L.) is extremely sensitive to low temperature. This adverse environment seriously damaged the quality of tobacco leaves, but can be mitigated by pay attention to the weather forecast and pick tobacco leaves in advance.Ĭold stress greatly influences crops growing in high-altitude areas, so it is essential to explore the mechanism of natural cold stress to field crops. This study confirmed that cold stress in high-altitude tobacco areas was the main reason for the browning of tobacco leaves during the tobacco curing process.
Therefore, the quality of fresh tobacco leaves, the content of key chemical components, and the production quality were greatly reduced by cold stress. We hypothesize that cold stress in high altitude environments destroyed the antioxidant enzyme system of mature flue-cured tobacco.
Further research found the quality of fresh tobacco leaves, the content of key chemical components, and the production quality were greatly reduced by cold stress.
ResultsĪfter the flue-cured tobacco suffered cold stress in the field, the surface color of tobacco leaves changed and obvious large browning areas were appeared, and the curing availability was extremely poor. A brupt diurnal temperature differences (the daily temperature dropping more than 20 ☌) along with rainfall in tobacco-growing areas at an altitude above 2450 m, caused cold stress to field-grown tobacco. Weather change in high-altitude areas subjects mature tobacco ( Nicotiana tabacum L.) to cold stress, which damages tobacco leaf yield and quality.
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