NaCl-induced [Ca²⁺]_i increases inhibits NaCl-activated channels more than H₂O₂-activated channels.

<div><p>(A and C) <i>Arabidopsis</i> seedlings were subjected to a 200 mM NaCl treatment once at 0 sec, and the solution was perfused by deionized water at 200 sec. Then, a second 200 mM NaCl (A), or 4 mM H₂O₂ (C) treatment was applied around 300 sec. Aequorin luminescence was recorded continuously through the treatments in the dark.</p> <p>(B and D) Quantification of [Ca²⁺]_i increases for the 2^nd NaCl (B) or 2^nd H₂O₂ treatment (C) from experiments as in (A) to (C), respectively. Data for four independent experiments are shown (mean ± sd; <i>n</i> = 64; NS, not significant <i>P</i> > 0.05; *** <i>P</i> < 0.001).</p>