Definition of tonoplast in English:

tonoplast

noun

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

    • ‘However, these cells had a continuous layer of smooth plasma membrane, and central vacuoles had distinct tonoplasts.’
    • ‘The tonoplast of K. daigremontiana mesophyll cells exhibits circadian behaviour of malate retention under constant darkness.’
    • ‘MIPs are abundant proteins localized to the plasma membrane, the tonoplast, or other endomembranes of plant cells.’
    • ‘The black material at the left edge of the micrograph is vacuolar tannin lining the tonoplast.’
    • ‘Aquaporins mediate the bidirectional passage of water over membranes and are present in tonoplasts and in plasma membranes of plant cells.’

Origin

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

Pronunciation:

tonoplast

/ˈtəʊnə(ʊ)plast//ˈtəʊnə(ʊ)plɑːst/