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Chilling tolerance in Nicotiana tabacum induced by seed priming with putrescine

文献类型： 外文期刊

作者： Xu, Shengchun 1 ; Hu, Jin 1 ; Li, Yongping 2 ; Ma, Wenguang 2 ; Zheng, Yunye 2 ; Zhu, Shuijin 1 ;

作者机构： 1.Zhejiang Univ, Dept Agron, Hangzhou 310029, Zhejiang, Peoples R China

2.So Ctr China Tobacco Breeding Res, Yunnan Tobacco Sci Res Inst, Yuxi 653100, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Vegetables, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Antioxidant enzymes;Chilling;Nicotiana tabacum L.;Polyamine;Seed priming;Seedling growth

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

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收录情况： SCI

摘要： Chilling stress is one of primary constraints to tobacco production in many parts of the world. The present study was conducted to induce chilling tolerance in tobacco by seed priming with putrescine (Put) in relation to physiological changes, using seeds from two tobacco varieties, MSk326 (chilling sensitive variety) and Honghuadajinyuan (HHDJY, chilling tolerant variety). Seed germination, seedling antioxidant enzyme activities and malondialdehyde (MDA) concentration, as well as polyamine concentration were determined under low temperature. During chilling stress at 11°C, seed priming with 0.01 mM Put for 48 h (Put0.01mM48 h) and seed priming with 0.1 mM Put for 48 h (Put0. 1mM48 h) significantly increased germination percentage, germination index, seedling length and dry weight of both varieties compared to the controls without Put treatment. When seedlings of 4-leaf stage suffered a short chilling stress (5°C), Put 0.1 mM 48 h improved the activities of antioxidant enzymes including superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX), increased endogenous Put, Spd and Spm concentration and decreased the MDA concentration. The results showed that Put priming treatments were available to enhance the chilling tolerance of tobacco seedlings. The optimal treatment of Put was Put0.1 mM48 h.

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