PJB-2017-606
Effects of exogenous polyamines on seedling growth and anti-oxidation capacity of tobacco under chilling stress
Guofu Wang
Abstract
Chilling stress is an important constraint to tobacco (Nicotiana tabacum) growth. Seeds of two tobacco varieties, cv. K326 (chilling sensitive) and HD (chilling tolerant) were used to investigate the effects of seed soaking treatments with different concentrations (0.01, 0.1 and 1.0 mM) of putrescine (Put) and spermidine (Spd) on seedling growth and anti-oxidation capacity under chilling stress. The results showed that germination percentage, germination index, mean germination time, shoot length, root length and seedling weight from soaking treatments with polyamines were significantly higher than control under chilling stress in both varieties. The soaking treatments with low concentration (0.01 mM and 0.1 mM) of Put significantly increased the activities of antioxidant enzymes, including superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and reduced the malondialdehyde (MDA) content in tobacco seedlings. The results showed that tobacco seeds soaking with Put and Spd at a suitable concentration could improve seed germination and seedling growth under chilling stress.
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