Effects of Exogenous Spermidine on Reactive Oxygen Species Levels andAntioxidant Enzymes Activities of Cucumber Seedlings under Salt Stress

ACTA HORTICULTURAE SINICA ›› 2006, Vol. 33 ›› Issue (3): 639-641.

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Effects of Exogenous Spermidine on Reactive Oxygen Species Levels andAntioxidant Enzymes Activities of Cucumber Seedlings under Salt Stress

Duan Jiuju;Guo Shirong^*;Kang Yunyan

(College of Horticulture, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China)

Received:2005-07-25 Revised:2005-10-17 Online:2006-06-25 Published:2006-06-25

Abstract

Abstract: The cucumber seedlings were investigated under salt stress, the results showed that Spd treatment decreased the H₂O₂and MDA contents, and O₂^·
production rate, while the activities of superoxide dismutase ( SOD) , peroxidase ( POD) and catalase (CAT) were promoted under 50 mmol·L ^{- 1} NaCl stress. Spd treatment in ‘Jinchun 2’ seedlings ( low salt-resistance) was more effective than the ‘Changchun Mici’ seedlings ( high salt-resistance). It indicates that exogenous Spd treatment could mitigate the injuries caused by NaCl stress and enhance salt stress resistance of cucumber seedlings through promoting antioxidant enzymes activities and keeping low ROS levels under salt stress.

Key words: Spermidine, Cucumber, Seedling, Salt stress, Reactive oxygen species, Antioxidant enzyme

Duan Jiuju;Guo Shirong;Kang Yunyan. Effects of Exogenous Spermidine on Reactive Oxygen Species Levels andAntioxidant Enzymes Activities of Cucumber Seedlings under Salt Stress[J]. ACTA HORTICULTURAE SINICA, 2006, 33(3): 639-641.

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Effects of Exogenous Spermidine on Reactive Oxygen Species Levels andAntioxidant Enzymes Activities of Cucumber Seedlings under Salt Stress

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