Volume 48, Issue 8 pp. 920-927
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Effects of Exogenous Spermidine on Photosystem II of Wheat Seedlings Under Water Stress

Hui-Guo Duan

Hui-Guo Duan

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University , Chengdu 610064, China

Department of Chemistry and Life Sciences, Neijiang Teachers' College , Neijiang 641112, China

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Shu Yuan

Shu Yuan

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University , Chengdu 610064, China

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Wen-Juan Liu

Wen-Juan Liu

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University , Chengdu 610064, China

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De-Hui Xi

De-Hui Xi

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University , Chengdu 610064, China

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Dong-Hong Qing

Dong-Hong Qing

Department of Chemistry and Life Sciences, Neijiang Teachers' College , Neijiang 641112, China

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Hou-Guo Liang

Hou-Guo Liang

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University , Chengdu 610064, China

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Hong-Hui Lin

Corresponding Author

Hong-Hui Lin

Key Laboratory of Bio-resources and Eco-environment (Ministry of Education), College of Life Sciences, Sichuan University , Chengdu 610064, China

*Author for correspondence. Tel: +86 (0)28 8541 1175; E-mail: <[email protected]>.Search for more papers by this author
First published: 02 August 2006
Citations: 41

Supported by the National Natural Science Foundation of China (30571119), the Sichuan Science and Technology Foundation (04ZQ026-036 and 05JY029-017), the Education Ministry Doctoral Foundation of China (20040610015), and the Chengdu Science and Technology Foundation (05HJSW117).

Abstract

The effects of exogenous spermidine (Spd) on lipid peroxidation, relative plasma membrane permeability, photosystem II (PSII) gene expression and PSII photochemical activity in water-stressed wheat seedlings were investigated. The decrease in relative water content (RWC), Chl content, and 2,6-dichlorophenol indophenol (DCIP) photoreduction of PSII, and increases in electrolyte leakage of plasma membranes and malonyldialdehyde (MDA) in water-stressed leaves was alleviated by Spd pretreatment. Furthermore, Western and Northern blot analysis showed that decreases in the PSII major proteins D1, D2 and LHCII and the transcripts of corresponding genes psbA, psbD and cab were also alleviated by Spd pretreatment under water stress. These results suggest that the application of exogenous Spd protects PSII against water stress at both the transcriptional level and the translational level, and allows PSII to retain a higher activity level during water stress. The protective role of Spd in the photosynthetic apparatus also is discussed.

(Managing editor: Ping He)

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