The energy cost of the tonoplast futile sodium leak
Active removal of Na⁺ from the cytosol into the vacuole plays a critical role in salinity tissue tolerance, but another, often neglected component of this trait is Na⁺ retention in vacuoles. This retention is based on an efficient control of Na⁺-permeable slow- and fast-vacuolar channels that mediat...
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| Veröffentlicht in: | The New phytologist 2020-02, Vol.225 (3), p.1105-1110 |
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| container_title | The New phytologist |
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| creator | Shabala, Sergey Chen, Guang Chen, Zhong-Hua Pottosin, Igor |
| description | Active removal of Na⁺ from the cytosol into the vacuole plays a critical role in salinity tissue tolerance, but another, often neglected component of this trait is Na⁺ retention in vacuoles. This retention is based on an efficient control of Na⁺-permeable slow- and fast-vacuolar channels that mediate the back-leak of Na⁺ into cytosol and, if not regulated tightly, could result in a futile cycle. This Tansley insight summarizes our current knowledge of regulation of tonoplast Na⁺-permeable channels and discusses the energy cost of vacuolar Na⁺ sequestration, under different scenarios. We also report on a phylogenetic and bioinformatic analysis of the plant two-pore channel family and the difference in its structure and regulation between halophytes and glycophytes, in the context of salinity tolerance. |
| doi_str_mv | 10.1111/nph.15758 |
| format | Article |
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This retention is based on an efficient control of Na⁺-permeable slow- and fast-vacuolar channels that mediate the back-leak of Na⁺ into cytosol and, if not regulated tightly, could result in a futile cycle. This Tansley insight summarizes our current knowledge of regulation of tonoplast Na⁺-permeable channels and discusses the energy cost of vacuolar Na⁺ sequestration, under different scenarios. 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New Phytologist © 2019 New Phytologist Trust</rights><rights>2019 The Authors. 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| source | Wiley-Blackwell Free Backfiles(OpenAccess); Wiley Online Library - AutoHoldings Journals; MEDLINE; Elektronische Zeitschriftenbibliothek; JSTOR |
| subjects | Channels Cytosol Energy costs Energy Metabolism H+‐ATPase halophyte Halophytes Permeability Phylogeny Plant Proteins - metabolism Proton Pumps - metabolism Retention Salinity Salinity effects salinity stress Salinity tolerance Salt-Tolerant Plants - metabolism Sodium Sodium - metabolism Tansley insight tonoplast ion channels two‐pore channel 1 (TPC1) vacuolar sodium sequestration Vacuoles Vacuoles - metabolism |
| title | The energy cost of the tonoplast futile sodium leak |
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