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Statistically significant changes in pHc occur in columella cells of Arabidopsis following gravistimulation (t = 0 s). A, Tier 2 cells (n = 10) alkalinize immediately following gravistimulation. ●, Control; ▿, after gravistimulation. B, Tier 3 cells (n = 10) acidify 180 s following gravistimulation. ●, Control; ▿, after gravistimulation.
