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The citrus fruit proteome: insights into citrus fruit metabolism

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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.

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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.

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Authors and Affiliations

  1. Department of Plant Sciences, University of California, Davis, CA, 95616, USA

    E. Katz, M. Fon & E. Blumwald

  2. Genome Center, University of California, Davis, CA, 95616, USA

    Y. J. Lee & B. S. Phinney

  3. Department of Fruit Tree Species, ARO, The Volcani Center, 50250, Bet Dagan, Israel

    A. Sadka

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  1. E. Katz
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  2. M. Fon
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  3. Y. J. Lee
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  4. B. S. Phinney
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  5. A. Sadka
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  6. E. Blumwald
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Correspondence to E. Blumwald.

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Katz, E., Fon, M., Lee, Y.J. et al. The citrus fruit proteome: insights into citrus fruit metabolism. Planta 226, 989–1005 (2007). https://doi.org/10.1007/s00425-007-0545-8

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