Molecular Genetics and Genomics

, Volume 279, Issue 2, pp 171–182 | Cite as

Ascorbate peroxidase gene family in tomato: its identification and characterization

  • Naim Najami
  • Tibor Janda
  • Waseim Barriah
  • Galya Kayam
  • Moshe Tal
  • Micha Guy
  • Micha VolokitaEmail author
Original Paper


The antioxidative response, where ascorbate peroxidase (APX) is a key enzyme, is an integral part of the plant tolerance response to environmental stresses. As a first step towards the study of the physiological role and the regulation of the members of the Apx gene family, the orthologs of the stress-sensitive cultivated tomato Solanum lycopersicum cv. M82 (Slm) and of the wild salt-tolerant species S. pennellii acc. Atico (Spa) were identified by utilizing the tomato EST database, and characterized. A redundant list of 16 virtual Apx transcripts and four singleton ESTs was shown to correspond to seven genuine Apx genes. The complete tomato Apx gene family is comprised of genes encoding three cytosolic, two peroxisomal, and two chloroplastic APXs. These genes attained differential regulatory patterns in various Slm organs. More detailed study of Apx1 and Apx2 genes, that are the products of a recent gene duplication event, shows that they have already attained differential regulation within and between Slm and Spa under control and stress conditions. It is also suggested that due to lineage-specific gene duplication and lose events, intricate phylogenetic relationships exist among the members of the Apx gene families.


Ascorbate peroxidase Gene duplication Gene expression Gene family Tomato 



We thank Prof. L. Reinhold for critical reading of the manuscript and many useful comments. The study was supported by Dr. Herman Kessel Research Fund, in the memory of Mr. C. J. J. Van Kensbury.

Supplementary material

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Table S1 (DOC 33 kb)
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Table S2 (DOC 22 kb)
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Table S4 (DOC 29 kb)


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Naim Najami
    • 1
  • Tibor Janda
    • 2
    • 4
  • Waseim Barriah
    • 1
  • Galya Kayam
    • 1
  • Moshe Tal
    • 1
  • Micha Guy
    • 2
  • Micha Volokita
    • 3
    Email author
  1. 1.Department of Life SciencesBen-Gurion University of the NegevBeer-ShevaIsrael
  2. 2.The Institutes for Desert Research, The Albert Katz department for Dryland BiotechnologiesBen-Gurion University of the NegevSede BoqerIsrael
  3. 3.The National Institute for Biotechnology in the NegevBen-Gurion University of the NegevBeer-ShevaIsrael
  4. 4.Agricultural Research Institute of the Hungarian Academy of SciencesMartonvásárHungary

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