Homeostasis and transport of inorganic phosphate in plants

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In this review, homeostasis of inorganic phosphate (Pi) in plants is discussed in terms of membrane transport of Pi. Phosphate homeostasis is observed in plant systems at various levels. The cytoplasmic level of Pi is kept almost constant by exploitation of the vacuole as a reservoir of Pi. The vacuole also seems to maintain the apoplastic level of Pi at a quasi-constant level. During Pi deficiency, Pi is re-translocated from the older to the younger leaves. The concentration of Pi in young leaves, thus, is kept at a higher level without a supply of Pi from the root. The phenomenon can be referred to as leaf-level Pi homeostasis. All these phenomena are related to membrane Pi transport activities. Pi uptake activities of both the plasma membrane and the tonoplast change in response to the supply of Pi. Pi transport across the plasma membrane is controlled by the activities of both the Pi transporter and the H+ pump, the activity of which is modulated by Pi itself.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalPlant and Cell Physiology
Issue number1
Publication statusPublished - 1995 Jan

All Science Journal Classification (ASJC) codes

  • Physiology
  • Plant Science
  • Cell Biology


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