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Fig. 1. Relative elongation rates of roots (percentage of con-trol without Al) from Al-resistant variety ATP SR Yellow andAl-sensitive variety HS 701 B exposed to 50 �M Al for 4 or 24h.
Fig. 2. Fluorescence microscopy images of the surface of primary roots (5 mm from tip) of the Al-sensitive variety HS 701 B (A–C) and Al-resistant variety ATP SRYellow (D–F) exposed to control (A, D) or 50 �M Al treatments for 4 (B, E) or 24 h (C, E)
Fig. 3. Fluorescence microscopy images of tips of primary roots stained with morin for Al detection
Fig. 4. Ethylene production (A, B), ACC synthase activity (C, D) and ACC oxidase activity (E, F) in 5 mm root tips of Al-resistantATP SR Yellow and Al-sensitive HS 701 B exposed for 4 or 24 h to control (0 �M Al) or 50 �M Al-containing nutrient solution,(E, F).

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