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Plant Molecular Biology Reporter

, Volume 30, Issue 2, pp 309–318 | Cite as

Role of a Newly Cloned Alternative Oxidase Gene (BjAOX1a) in Turnip Mosaic Virus (TuMV) Resistance in Mustard

  • Lei Zhu
  • Yanman Li
  • Neelam Ara
  • Jinghua Yang
  • Mingfang Zhang
Article

Abstract

A new alternative oxidase (AOX) gene, designated as BjAOX1a, of mustard (Brassica juncea) was cloned by reverse transcription-polymerase chain reaction (RT-PCR). The full-length cDNA of BjAOX1a was 1,346 bp in size and containing an open reading frame (ORF) of 1,083 bp in size. The predicted amino acid sequence exhibited 82.17% homology to the alternative oxidase of Arabidopsis thaliana. Analysis of functional regions revealed that the BjAOX1a protein contained several metal-binding regions, α-helical regions, and cysteine residues, similar to other AOX1 proteins. Pretreatment of mustard plants with salicylhydroxamic acid (SHAM), an inhibitor of AOX protein, inhibited AOX activity and promoted systemic movement of the coat protein of Turnip mosaic virus (TuMV), whereas pretreatment of plants with antimycin A (AA), a cytochrome pathway inhibitor, inhibited the systemic movement of the coat protein of TuMV. Furthermore, H2O2 and O2− contents were enhanced following SHAM pretreatment. Thus, AOX1 might alleviate reactive oxygen species (ROS) and enhance resistance of mustard plants to TuMV, and could serve as a critical component in TuMV resistance.

Keywords

Alternative oxidase (AOX) Reactive oxygen species Cyanide (CN)-resistant respiration Turnip mosaic virus (TuMV) 

Notes

Acknowledgements

We thank Prof. JS. Chen for providing the B strain of TuMV. We also express our gratitude to Dr. X. Li for the measurements of respiratory rate. This work was supported by grants from Trans-Century Fund for the Excellence Talents by the State Education Commission (J20070206).

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Lei Zhu
    • 1
    • 2
  • Yanman Li
    • 1
    • 2
  • Neelam Ara
    • 1
    • 2
  • Jinghua Yang
    • 1
    • 2
  • Mingfang Zhang
    • 1
    • 2
  1. 1.Laboratory of Genetic Resources and Functional Improvement for Horticultural Plants, Department of HorticultureZhejiang UniversityHangzhouChina
  2. 2.Key laboratory of Horticultural Plant Growth, Development and Quality ImprovementMinistry of AgricultureHangzhouChina

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