Effects of exogenous spermidine on polyamine metabolism in cucumber (Cucumis sativus L.) seedlings under NaCl stress

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Effects of exogenous spermidine on polyamine metabolism in cucumber (Cucumis sativus L.) seedlings under NaCl stress

Journal Title: Science Paper Online - Year 2007, Vol 2, Issue 2

Abstract

The effects of exogenous spermidine (Spd) on the levels of polyamines (PAs) and the activities of some key enzymes involved in PA metabolism in two cucumber (Cucumis sativus L.) cultivar seedlings differing in salinity-resistance are investigated under NaCl stress in a nutrient solution culture system in this paper. The results show that the activities of agrinine decarboxylase (ADC)、ornithine decarboxylase (ODC)、S-adenosylmethionine decarboxylase (SAMDC) and polyamine oxidase (PAO) significantly increase in leaves and roots of seedlings expose to 50 mmolL-1 NaCl stress, resulting in the significant increases in the contents of putrescine (Put)、Spd and spermine (Spm). In comparison with the seedlings of lower salinity-resistant cv. Jinchun No. 2, the increases of the contents of Spd and Spm and the activities of ADC、ODC and SAMDC are much higher in the seedlings of stronger salinity-resistant cv. Changchun mici, while the increases of Put content and PAO activity lower. Exogenous 0.1 mmolL-1 Spd application treatment promotes rapid increases of the activities of ADC、ODC and SAMDC and significantly increases the contents of Spd and Spm, while Put content and PAO activity decrease. The effects of exogenous Spd application are more pronounced in cv. Jinchun No. 2 than in cv. Changchun mici. It indicates that exogenous Spd can be involved in the regulation of PA metabolism and play an important role in enhancing salinity stress tolerance in seedlings.

Authors and Affiliations

Jiuju Duan, Shirong Guo, Jing Li, Yunyan Kang

Keywords

EP ID EP149748
DOI -
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