Definition of tonoplast in English:

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Pronunciation: /ˈtəʊnə(ʊ)plast/
Pronunciation: /ˈtəʊnə(ʊ)plɑːst/


A membrane which bounds the chief vacuole of a plant cell.
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'.

For editors and proofreaders

Line breaks: tono|plast

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