Crops ›› 2023, Vol. 39 ›› Issue (2): 151-156.doi: 10.16035/j.issn.1001-7283.2023.02.022

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Effects of Exogenous Salicylic Acid on Physiological Characteristics of Flue-Cured Tobacco Seedlings under Low Temperature Stress

Niu Hanhui1(), Wei Xiaokai1(), Yu Shikang2, Gu Huizhan2, He Jixian2, Zhang Qili2, Li Junju2, Jing Yanqiu1(), Lei Qiang3()   

  1. 1College of Tobacco, Henan Agricultural University, Zhengzhou 450002, Henan, China
    2Guangyuan Branch of Sichuan Tobacco Company, Guangyuan 628017, Sichuan, China
    3Sichuan Branch of China National Tobacco Company, Chengdu 610041, Sichuan, China
  • Received:2021-12-31 Revised:2022-06-14 Online:2023-04-15 Published:2023-04-11

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Abstract:

In order to reveal the physiological effects of exogenous salicylic acid on improving the low temperature resistance of flue-cured tobacco seedlings, Yunyan 87 was used as the material, and artificial climate incubator was used to simulate 4°C low temperature. Different concentrations (0, 0.6, 0.8, 1.0 and 1.2mmol/L) of salicylic acid were set up to pretreatment on flue-cured tobacco seedlings for three days, followed by five days of low temperature treatment. With 25°C and spraying distilled water as control, the effects of active oxygen metabolism, antioxidant enzyme activity, osmotic adjustment substance content and root activity of flue-cured tobacco seedlings were measured. The results showed that, under low temperature stress, the reactive oxygen species of flue-cured tobacco seedlings increased, and the degree of membrane lipid peroxidation increased, which inhibited the growth and development of seedlings. Exogenous salicylic acid could significantly improve the antioxidant enzyme activity of flue-cured tobacco seedlings under low temperature stress, increase the content of osmotic adjustment substances, reduce the O-2· production rate and MDA accumulation, alleviate the damage of low temperature stress on flue-cured tobacco seedlings, and enhance their low temperature resistance.

Key words: Low temperature stress, Salicylic acid, Physiological characteristics

Fig.1

Effects of exogenous salicylic acid on MDA content of flue-cured tobacco seedlings under low temperature stress Different lowercase letters indicate significant differences (P < 0.05), the same below"

Fig.2

Effects of exogenous salicylic acid on the O-2· production rate of flue-cured tobacco seedlings under low temperature stress"

Fig.3

Effects of exogenous salicylic acid on SOD, POD and CAT activities of flue-cured tobacco seedlings under low temperature stress"

Fig.4

Effects of exogenous salicylic acid on Pro and soluble protein contents of flue-cured tobacco seedlings under low temperature stress"

Fig.5

Effects of exogenous salicylic acid on root activity of flue-cured tobacco seedlings under low temperature stress"

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