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Polyamines are involved in chilling tolerance in tobacco (Nicotiana tabacum) seedlings

文献类型： 外文期刊

作者： Wang, Yang 1 ; Wang, Gangjun 2 ; Zheng, Yuanting 3 ; Zheng, Yunye 4 ; Li, Sujuan 2 ; Shao, Jianfeng 2 ; Luo, Jie 2 ; Hu, 1 ;

作者机构： 1.Zhejiang Agr & Forestry Univ, Coll Agr & Food Sci, Key Lab Agr Prod Qual Improvement Technol Zhejian, Hangzhou 311300, Zhejiang, Peoples R China

2.Zhejiang Acad Agr Sci, Cent Lab, Hangzhou 310021, Zhejiang, Peoples R China

3.Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou 310029, Zhejiang, Peoples R China

4.Yuxi China Tobacco Seed Ltd Co, Yuxi 653100, Peoples R China

关键词： Tobacco; Polyamine metabolism; Chilling stress; Biosynthesis inhibitors; Seedling growth

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

ISSN： 0167-6903

年卷期： 2019 年 89 卷 2 期

页码：

收录情况： SCI

摘要： To better understand the role of polyamines (PAs) and their metabolism in responses to chilling stress in tobacco plants, this study investigated changes of endogenous PA contents, PA synthetase and oxidase activities, seedling growth and membrane permeability in tobacco (Nicotiana tabacum) cvs. MSk326 (MK, chilling-sensitive variety) and Honghuadajinyuan (HD, chilling-tolerant variety) under chilling stress. Chilling stress significantly reduced the shoot and root dry weights but improved PA contents, especially of putrescine, in the two tobacco cultivars, with higher contents in the tolerant variety. Moreover, stepwise regression analysis indicated that the relative growth rate of tobacco seedlings under chilling stress was positively correlated with endogenous PA contents, putrescine and spermidine, particularly. The above results suggested that the resistance of tobacco seedlings to chilling stress was promoted mainly by putrescine and spermidine. And further study specified that the higher PA contents in the chilling-tolerant tobacco variety were related to higher PA synthetase activities [arginine decarboxylase (ADC) and ornithine decarboxylase (ODC)] and lower oxidase activities (diamine oxidase and polyamine oxidase) under chilling stress. Again, the study demonstrated that PA biosynthesis in tobacco seedlings was mainly dependent on the ODC pathway under chilling stress, through ADC and ODC inhibitor application and recovery treatments. Compared with the ADC inhibitor (d-arginine), the ODC inhibitor (2-fluoromethyl ornithine) more significantly inhibited PA contents and increased membrane permeability in tobacco seedlings under chilling stress. In summary, the research findings suggested PAs play an important role in regulating the chilling tolerance of tobacco seedlings.

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