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Effect of Fe, P or S deficiency on the expression of the P-related gene PAP17 (A); and of phosphatase activity (PA; B) in roots of the Arabidopsis ethylene mutant ctr1. Treatments and determinations as in Figure 5. Within each day and genotype, * or ** indicate significant differences (P < 0.05 or P < 0.01) in relation to the control treatment.
