The Difference of Biochemistry and the Sensitivity to Low Temperature in Flue-Cured Tobacco Varieties

Flue-cured tobacco varieties with different chilling tolerance, such as Zhongyan100, NC82, K326, were treated eated with 2 ℃, 5 ℃and 8 ℃ at 5th-leaf stage. The sensitivity to low temperatures of flue-cured tobacco varieties were investigated according to the biochemical indexes, such as relative electrical conductivity, MDA, Peroxidase activity, Proline content and so on. The results demonstrated that, relative electrical conductivity, Peroxidase activity, MDA content and Proline content all obviously rise under the low temperature stress; In all the three tobacco varieties, the low temperature sensitivities are higher under 2 ℃ and 5 ℃, and the most under 2 ℃ treatment of 3 days, the least under 8 ℃ treatment of 7 days.