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As(V) sensitivity to BSO increased preferentially in CK-depleted plants. Plants were grown on Johnson medium with 12.5 μm Pi in a vertical position for 5 d and then transferred to the same medium with 20 μm As(V) alone or with increasing concentrations of BSO. Root growth inhibition (fold change) was determined by quantifying root elongation after 3 d of As(V) exposure alone or with BSO. Bars show mean ± sd (n ≥ 15). *P < 0.0001 (Student’s t test).
