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Open AccessArticle

Effects of Exogenous Spermidine on Root Metabolism of Cucumber Seedlings under Salt Stress by GC-MS

by Bing Liu 1,2,†, Xujian Peng 3,†, Lingjuan Han 1, Leiping Hou 1 and Bin Li 1,*
1
Collaborative Innovation Center for Improving Quality and Increase Profits of Protected Vegetables in Shanxi, College of Horticulture, Shanxi Agricultural University, Taigu 030801, China
2
Collaborative Innovation Center of Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
3
Department of Public Order, Nanjing Forest Police College, Nanjing 210023, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Agronomy 2020, 10(4), 459; https://doi.org/10.3390/agronomy10040459
Received: 20 February 2020 / Revised: 21 March 2020 / Accepted: 23 March 2020 / Published: 26 March 2020
To investigate the effects of exogenous spermidine (Spd) on metabolism changes under salt stress in cucumber roots, a gas chromatography-mass spectrometry (GC-MS) was performed. The results showed that most of the 142 metabolites responded to salt stress or exogenous Spd treatment. Salt stress reduced carbon consumption, resulted in the transformation of glycolysis and the tricarboxylic acid (TCA) cycle to the pentose phosphate pathway (PPP), and meanwhile increased salicylic acid (SA) and ethylene synthesis, and, thus, inhibited the growth of seedlings. However, exogenous Spd further improved the utilization of carbon, the energy-saving pattern of amino acid accumulation, and the control of hydroxyl radicals. In conclusion, Spd could promote energy metabolism and inhibit SA and ethylene synthesis in favor of root growth that contributes to higher salt tolerance. This study provides insight that may facilitate a better understanding of the salt resistance by Spd in cucumber seedlings. View Full-Text
Keywords: spermidine; salt stress; roots; metabolomics; cucumber spermidine; salt stress; roots; metabolomics; cucumber
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Liu, B.; Peng, X.; Han, L.; Hou, L.; Li, B. Effects of Exogenous Spermidine on Root Metabolism of Cucumber Seedlings under Salt Stress by GC-MS. Agronomy 2020, 10, 459.

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