English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Toxicity from sodium accumulation is an important aspect of salinity stress that has been well studied at the organ and tissue level. However, the effects of salinity on sodium accumulation in the cytosol, where much of the sodium toxicity is thought to occur, are poorly understood due to the difficulty of direct non-invasive measurements of ion activities in living cells. The Na+-sensing fluorescent probe sodium-binding benzofuran isophthalate (SBFI) and the K+-sensing fluorescent probe potassium-binding benzofuran isophthalate (PBFI) were used to quantify Na+ and K+ activity in living root hairs under salinity stress. The effects of exposure of Arabidopsis thaliana roots to 0, 30, 60 or 90 mM NaCl were observed during the 20 min immediately following salinization and also after 2 d of salinization, in plants supplied with 0.5, 2.0 or 5.0 mM Ca. SBFI and PBFI fluorescence was confined primarily to the cytoplasm, with very little signal from the vacuole. Sodium affected the quantification of K+ by PBFI, thus limiting the usefulness of this dye. Root hairs exposed to NaCl accumulated from 30-60 mM Na+ within the first 5 min of salinization in 0.5 and 2.0 mM Ca2+, and up to 15 mM Na+ in the 5.0 mM Ca2+ treatment. Two days of salinization did not increase cytosolic Na+ concentrations beyond the values observed after 20 min of salinization. Cytosolic activities roughly corresponded with elemental analysis of combined dry matter fractions from whole plants. We conclude that SBFI and, to a lesser extent, PBFI are useful tools for quantifying the dynamics of ion activities in the cytosols of living plant cells.

Effects of salinity on cytosolic Na+ and K+ in root hairs of Arabidopsis thaliana: in vivo measurements using the fluorescent dyes SBFI and PBFI