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Planta

, Volume 226, Issue 4, pp 989–1005 | Cite as

The citrus fruit proteome: insights into citrus fruit metabolism

  • E. Katz
  • M. Fon
  • Y. J. Lee
  • B. S. Phinney
  • A. Sadka
  • E. BlumwaldEmail author
Original Article

Abstract

Fruit development and ripening are key processes in the production of the phytonutrients that are essential for a balanced diet and for disease prevention. The pathways involved in these processes are unique to plants and vary between species. Climacteric fruit ripening, especially in tomato, has been extensively studied; yet, ripening of non-climacteric fruit is poorly understood. Although the different species share common pathways; developmental programs, physiological, anatomical, biochemical composition and structural differences must contribute to the operation of unique pathways, genes and proteins. Citrus has a non-climacteric fruit ripening behavior and has a unique anatomical fruit structure. For the last few years a citrus genome-wide ESTs project has been initiated and consists of 222,911 clones corresponding to 19,854 contigs and 37,138 singletons. Taking advantage of the citrus database we analyzed the citrus proteome. Using LC-MS/MS we analyzed soluble and enriched membrane fractions of mature citrus fruit to identify the proteome of fruit juice cells. We have identified ca. 1,400 proteins from these fractions by searching NCBI-nr (green plants) and citrus ESTs databases, classified these proteins according to their putative function and assigned function according to known biosynthetic pathways.

Keywords

Citrus sinensis Juice sac cell LC-MS/MS Sugar metabolism Vesicle trafficking Citrate metabolism 

Notes

Acknowledgments

This work was supported by grant No. 5000-117 from the California Citrus Research Board, by a Research Grant No. US-3575-04R from BARD, the United States-Israel Binational Agricultural Research and Development Fund, and by the Will W. Lester Endowment, University of California.

Supplementary material

425_2007_545_MOESM1_ESM.xls (4.3 mb)
Supplementary Table 1(XLS 4.3 Mb)

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • E. Katz
    • 1
  • M. Fon
    • 1
  • Y. J. Lee
    • 2
  • B. S. Phinney
    • 2
  • A. Sadka
    • 3
  • E. Blumwald
    • 1
    Email author
  1. 1.Department of Plant SciencesUniversity of CaliforniaDavisUSA
  2. 2.Genome CenterUniversity of CaliforniaDavisUSA
  3. 3.Department of Fruit Tree SpeciesARO, The Volcani CenterBet DaganIsrael

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