Figure 1.

Cucumber seedlings under different conditions of Fe supply. (A) 10 days-old cucumber seedlings grown in hydroponic medium containing either 500 μM Fe(III)-EDTA (Fe excess), 50 μM Fe(III)-EDTA (control), or with no added Fe in the medium (Fe deficiency). (B) Leaves of cucumber seedlings grown as in (A). (C) Chl content (mg g⁻¹ FW) of seedlings leaves, grown as in (A); upper panel: total Chl content; lower panel: Chla and Chlb content. Bars represent mean values ± SE from 4 independent samples of 3–4 leaves each (D) O₂ consumption in seedlings roots, grown as in (A); for each condition (Fe excess, control, Fe deficiency), the initial rate and the rates after addition of KCN or KCN + SHAM are provided. Bars represent mean values ± SE from 6 independent samples of 10 root tips each.