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Brassinosteroids alleviate chilling-induced oxidative damage by enhancing antioxidant defense system in suspension cultured cells of Chorispora bungeana

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Abstract

Brassinosteroids (BRs), a class of plant steroid hormones, play a significant role in the amelioration of various biotic and abiotic stresses. In order to further explore and elaborate their roles in plants subjected to chilling stress, suspension cultured cells of Chorispora bungeana with or without 24-epibrassinolide (EBR) application were exposed to 4 and 0°C for 5 days. The EBR treated cells exhibited higher viability after exposure to low temperatures compared with the control. Under chilling stress, reactive oxygen species (ROS) levels and lipid peroxidation were increased in the cultured cells, which were significantly inhibited by EBR application. The activities of antioxidative enzymes such as ascorbate peroxidase (APX), catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) were increased during chilling treatments, and these increases were more significant in the EBR applied suspension cells. The EBR treatment also greatly enhanced contents of ascorbic acid (AsA) and reduced glutathione (GSH) under chilling stress. From these results, it can be concluded that EBR could play the positive roles in the alleviation of oxidative damage caused by ROS overproduction through enhancing antioxidant defense system, resulting in improving the tolerance of C. bungeana suspension cultures to chilling stress.

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Abbreviations

APX:

Ascorbate peroxidase

AsA:

Ascorbic acid or ascorbate

BRs:

Brassinosteroids

CAT:

Catalase

EBR:

24-Epibrassinolide

GSH:

Reduced glutathione

H2O2 :

Hydrogen peroxide

MDA:

Malondialdehyde

NBT:

Nitroblue tetrazolium

OH :

Hydroxyl radical

O2 :

Superoxide radical

POD:

Peroxidase

ROS:

Reactive oxygen species

SOD:

Superoxide dismutase

TBA:

Thiobarbituric acid

TCA:

Trichloroacetic acid

TTC:

2, 3, 5-Triphenyltetrazolium chloride

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Acknowledgments

This study has been supported by the National Outstanding Youth Foundation of China (No. 30625008), the National High Technology Research and Development Program of China (863 Program) (No. 2007AA021401) and the National Basic Research Program of China (973 Program) (No. 2007CB108902).

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Correspondence to Lizhe An.

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Liu, Y., Zhao, Z., Si, J. et al. Brassinosteroids alleviate chilling-induced oxidative damage by enhancing antioxidant defense system in suspension cultured cells of Chorispora bungeana . Plant Growth Regul 59, 207–214 (2009). https://doi.org/10.1007/s10725-009-9405-9

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  • DOI: https://doi.org/10.1007/s10725-009-9405-9

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