Definition of tonoplast in English:


Line breaks: tono|plast
Pronunciation: /ˈtəʊnə(ʊ)plast
, -plɑːst/


  • A membrane which bounds the chief vacuole of a plant cell.
    More example sentences
    • However, these cells had a continuous layer of smooth plasma membrane, and central vacuoles had distinct tonoplasts.
    • MIPs are abundant proteins localized to the plasma membrane, the tonoplast, or other endomembranes of plant cells.
    • The tonoplast of K. daigremontiana mesophyll cells exhibits circadian behaviour of malate retention under constant darkness.


late 19th century: from Greek tonos 'tension, tone' + plastos 'formed'.

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