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• W2890569098 endingPage "18" @default.
• W2890569098 startingPage "1" @default.
• W2890569098 abstract "Halophytes tolerate external salt concentrations of 200 mm and more, accumulating salt concentrations of 500 mm and more in their shoots; some, recretohalophytes, excrete salt through glands on their leaves. Ions are accumulated in central vacuoles, but the pathway taken by these ions from the outside of the roots to the vacuoles inside the cells is poorly understood. Do the ions cross membranes through ion channels and transporters or move in vesicles, or both? Vesicular transport from the plasma membrane to the vacuole would explain how halophytes avoid the toxicity of high salt concentrations on metabolism. There is also a role for vesicles in the export of ions via salt glands. We have collected data on the fluxes of sodium and chloride ions in halophytes, based on the weight of the transporting organs and on the membrane area across which the flux occurs; the latter range from 17 nmol m–2 s–1 to 4.2 μmol m–2 s–1 and values up to 1 μmol m–2 s–1 need to be consistent with whatever transport system is in operation. We have summarized the sizes and rates of turnover of vesicles in plants, where clathrin-independent vesicles are 100 nm or more in diameter and can merge with the plasma membrane at rates of 100 s–1. We gathered evidence for vesicular transport of ions in halophytes and evaluated whether vesicular transport could account for the observable fluxes. There is strong evidence in favour of vesicular transport in plants and circumstantial evidence in favour of the movement of ions in vesicles. Estimated rates of vesicle turnover could account for ion transport at the lower reported fluxes (around 20 nmol m–2 s–1), but the higher fluxes may require vesicles of the order of 1 μm or more in diameter. The very high fluxes reported in some salt glands might be an artefact of the way they were measured." @default.
• W2890569098 created "2018-09-27" @default.
• W2890569098 creator A5003250690 @default.
• W2890569098 creator A5034075424 @default.
• W2890569098 creator A5046438544 @default.
• W2890569098 date "2018-09-20" @default.
• W2890569098 modified "2023-10-15" @default.
• W2890569098 title "Could vesicular transport of Na+ and Cl– be a feature of salt tolerance in halophytes?" @default.
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