Changes in tonoplast and its proteins with the development of pear fruit

K. Shiratake, S. Hiroto, S. Yamaki, Y. Kanayama, M. Maeshima

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)


    To clarify the transport system of tonoplast and its roles in fruit development, we studied the changes in the nature of tonoplast during the development of pear fruit. The density of the tonoplast of young fruit was 1.12 g/ml and became lighter with fruit development. The phospholipid amount on protein basis increased with fruit development, suggesting that the change in the density of tonoplast was caused by the change in the ratio of phospholipid to protein. In addition, we determined the levels of two vacuolar proton pumps (V-ATPase and V-PPase) and a protein analogous to water channel (VM23P) by immunoblot analysis. The level of V-ATPase increased with fruit development, while, V-PPase level was particularly high at the cell-division stage in young fruit and remained almost the same at other stages. The level of VM23P was especially high during the active cell-expansion stage, and it might play an important role in the rapid expansion of cells as a vacuolar water channel. Further, we isolated the protein of 94 kDa, the major tonoplast protein in pear which function is unclear, and an antibody was raised against it. The level of TP94 was relatively low in young fruit and became higher in the tonoplasts at the middle and the end of fruit development.

    Original languageEnglish
    Title of host publicationXXV International Horticultural Congress, Part 4
    Subtitle of host publicationCulture Techniques with Special Emphasis on Environmental Implications
    PublisherInternational Society for Horticultural Science
    Number of pages8
    ISBN (Print)9789066057838
    Publication statusPublished - 2000 Jan 1

    Publication series

    NameActa Horticulturae
    ISSN (Print)0567-7572


    • Fruit development
    • Pear (Pyrus communis)
    • Proton pyrophosphatase
    • Tonoplast intrinsic protein (TIP)
    • Vacuolar proton ATPase
    • Water channel

    ASJC Scopus subject areas

    • Horticulture


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