Abstract
The role of mitochondrial alternative oxidase (AOX) and the relationship between systemic AOX induction, ROS formation, and systemic plant basal defense to Tobacco mosaic virus (TMV) were investigated in tomato plants. The results showed that TMV inoculation significantly increased the level of AOX gene transcripts, ubiquinone reduction levels, pyruvate content, and cyanide-resistant respiration (CN-resistant R) in upper, un-inoculated leaves. Pretreatment with potassium cyanide (KCN, a cytochrome pathway inhibitor) greatly increased CN-resistant R and reduced reactive oxygen species (ROS) formation, while application of salicylhydroxamic acid (SHAM, an AOX inhibitor) blocked the AOX activity and enhanced the production of ROS in the plants. Furthermore, TMV systemic infection was enhanced by SHAM and reduced by KCN pretreatment, as compared with the un-pretreated TMV counterpart. In addition, KCN application significantly diminished TMV-induced increase in antioxidant enzyme activities and dehydroascorbate/total ascorbate pool, while an opposite change was observed with SHAM-pretreated plants. These results suggest that the systemic induction of the mitochondrial AOX pathway plays a critical role in the reduction of ROS to enhance basal defenses. Additional antioxidant systems were also coordinately regulated in the maintenance of the cellular redox homeostasis.
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Abbreviations
- AOX:
-
Alternative oxidase
- APX:
-
Ascorbate peroxidase
- AsA:
-
Ascorbate
- A sat :
-
Light saturated rate of the CO2 assimilation
- CAT:
-
Catalase
- CN-resistant R:
-
Cyanide-resistant respiration
- CP:
-
Coat protein
- DAB:
-
3,3′-diaminobenzidine
- DHA:
-
Dehydroascorbate
- dpi:
-
Days post-inoculation
- GLDH:
-
l-galactono-1,4-lactone dehydrogenase
- GPOD:
-
Guaiacol peroxidase
- KCN:
-
Potassium cyanide
- NBT:
-
Nitroblue tetrazolium
- NO:
-
Nitric oxide
- ROS:
-
Reactive oxygen species
- SHAM:
-
Salicylhydroxamic acid
- SOD:
-
Superoxide dismutase
- TMV:
-
Tobacco mosaic virus
- UQ:
-
Ubiquinone
- UQH2:
-
Ubiquinol
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Acknowledgments
We thank Prof. Zhixiang Chen of Purdue University for his critical reading of the manuscript. This work was supported by the National Basic Research Program of China (2009CB119000), the National Natural Science Foundation of China (30800763 and 31071832), the National Key Technology R&D Program of China (2011BAD12B04) and the Fundamental Research Funds for the Central Universities.
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Liao, YWK., Shi, K., Fu, LJ. et al. The reduction of reactive oxygen species formation by mitochondrial alternative respiration in tomato basal defense against TMV infection. Planta 235, 225–238 (2012). https://doi.org/10.1007/s00425-011-1483-z
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DOI: https://doi.org/10.1007/s00425-011-1483-z