Abstract
Drought stress has a negative impact on plant cells and results in the generation of reactive oxygen species (ROS). To increase our understanding of the effects of drought stress on antioxidant processes, we investigated the response of the ascorbate-deficient Arabidopsis thaliana vtc1 mutant to drought stress. After drought stress, vtc1 mutants exhibited increases in several oxidative parameters, including H2O2 content and the production of thiobarbituric acid reactive substances. Decreases in chlorophyll content and chlorophyll fluorescence parameters were also observed. The vtc1 mutants had higher total glutathione than did wild-type (WT) plants after 48 h of drought stress. A reduced ratio of glutathione/total glutathione and an increased ratio of dehydroascorbate/total ascorbate were observed in the vtc1 mutants compared with the WT plants. In addition, the activities of enzymes that are responsible for ROS scavenging, including superoxide dismutase, catalase, and ascorbate peroxidase, were decreased in the vtc1 mutants compared with the WT plants. Similar reductions in activity in the vtc1 mutant were observed for the enzymes that are responsible for the regeneration of ascorbate and glutathione, including monodehydroascorbate reductase, dehydroascorbate reductase, and glutathione reductase. These results suggest that low intrinsic ascorbate and impaired ascorbate–glutathione cycling in the vtc1 mutant induced a decrease in the reduced form of ascorbate, which enhanced sensitivity to drought stress.
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Abbreviations
- AsA:
-
Ascorbate acid
- vtc1 :
-
Vitamin C-deficient mutant-1
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dimutase
- APX:
-
Ascorbate peroxidase
- GR:
-
Glutathione reductase
- AGC:
-
Ascorbate–glutathione cycle
- MDHA:
-
Monodehydroascorbate
- DHA:
-
Dehydroascorbate
- DHAR:
-
Dehydroascorbate reductase
- CAT:
-
Catalase
- POD:
-
Peroxidase
- ABA:
-
Abscisic acid
- GA:
-
Gibberellic acid
- NPQ:
-
Non-photochemical quenching
- GMPase:
-
GDP-mannose pyrophosphorylase
- UV-B:
-
Ultraviolet ray-B
- WT:
-
Wild type
- RWC:
-
Relative water content
- Chl:
-
Chlorophyll
- PSII:
-
Photosystem II
- PVP:
-
Polyvinyl pyrrolidone
- DMAB:
-
Dimethylamine borane
- MBTH:
-
3-Methyl-2-benzothiazolinone hydrazone hydrochloride monohydrate
- TBARS:
-
Thiobarbituric acid reactive substances
- TCA:
-
Trichloroacetic acid
- BHT:
-
Butylated hydroxytoluene
- DTT:
-
Dithiothreitol
- EDTA:
-
Ethylene diamine tetraacetic acid
- BSA:
-
Bovine serum albumin
- GSSG:
-
Oxidized glutathione
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Acknowledgments
This work was supported by program for National Natural Science Foundation (31060063), Gansu National Science Foundation (0803RJZA051), Gansu Provincial Key Laboratory of Aridland Crop Science(GSCS-02).The National Natural Science Foundation of China (No. 30771091 and 30970234), and the Program for New Century Excellent Talents in University (NCET) (2011 to Dr. Liu) by Ministry of Education (MOE).
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Communicated by G. Bartosz.
Y. Niu and Y. Wang contributed equally to this work.
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Niu, Y., Wang, Y., Li, P. et al. Drought stress induces oxidative stress and the antioxidant defense system in ascorbate-deficient vtc1 mutants of Arabidopsis thaliana . Acta Physiol Plant 35, 1189–1200 (2013). https://doi.org/10.1007/s11738-012-1158-9
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DOI: https://doi.org/10.1007/s11738-012-1158-9