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Effect of Fe, P or S deficiency on the expression of the Fe-related gene IRT1 in roots of the Arabidopsis WT Columbia and its ethylene mutants ctr1, ein2-1 and ein3eil1 (A–D). Treatments and gene expression determination as in Figure 1. Within each day and genotype, * or ** indicate significant differences (P < 0.05 or P < 0.01) in relation to the control treatment.
