Table 1. Dry weight (g), concentration of total Fe ([Fe]_t), concentration of ⁵⁷Fe in excess ([⁵⁷Fe]_e) and content of ⁵⁷Fe in excess (⁵⁷Fe_e) in the leaves, stems and roots measured in Citrus aurantium seedlings.

	+Fe		-Fe		ANOVA
	Ct	S	Ct	S	Fe	S	Fe x S
DW (g)
Leaves	10.33a	10.04a	5.91b	5.87b	***	ns	ns
Stems	4.65a	4.25b	3.18c	3.00c	***	*	***
Roots	2.86a	2.07b	2.50a	1.81b	**	***	ns
[Fe]t (μg Fe g-1 DW)
Leaves	75.85a	35.87b	31.21b	25.61b	***	***	***
Stems	6.42a	4.20b	4.90b	4.25b	**	***	***
Roots	496.72a	248.08b	127.42c	114.83c	***	***	***
[57Fe]e (μg 57Fe g-1 DW)
Leaves	0.94b	0.68c	2.49a	0.70c	***	***	***
Stems	0.29b	0.20c	0.70a	0.17c	***	***	***
Roots	3.59b	2.52c	7.33a	2.48c	***	***	***
57Fee (μg 57Fe plant-1)
Whole seedling	21.35b	12.89c	35.16a	9.13c	***	***	***
Aerial part	11.06b	7.68c	16.81a	4.65c	***	***	***
Roots	10.29b	5.21c	18.35a	4.48c	***	***	***

Plants were grown for 21 days in Fe-sufficient (+Fe) or Fe-deficient (-Fe) nutrient solutions with the non-stressed (Ct) or the flooding treatment (S). For ⁵⁷Fe determinations, plants were labelled immediately after treatments with 100 μM o,o-⁵⁷FeEDDHA for 24 h.

¹Values for DW and [Fe_t] are the means of six independent plants per treatment (n = 6). Values for [⁵⁷Fe_e] and ⁵⁷Fe_e are the means of three independent experiments (n = 3). For a comparison of the means, an ANOVA followed by the Fisher´s least significant differences (LSD) test, calculated at the 95% confidence level, was performed. Different letters in the same row indicate significant differences between the different genotypes and treatments. Levels of significance are represented by P < 0.05 (*), P < 0.01 (**), P < 0.001 (***) and ns (non-significant).