Citrate content in the root tips of C tora. 15 8 v3 05 0 10 691215 Al concentration (uM Time(h Exposed to the 0.5mM CaCl2(ph 4. 5)solutions containing various concentrations of Al for 12 h(a) Exposed to the 0.5mM CaCI,(ph 4.5) solutions containing OmM (filled squires)and 50mM(open squires)Al for 12 h(b).20 Exposed to the 0.5mM CaCl2 (pH 4.5) solutions containing various concentrations of Al for 12 h (a) Exposed to the 0.5mM CaCl2 (pH 4.5) solutions containing 0mM (filled squires) and 50mM (open squires) Al for 12 h (b). Citrate content in the root tips of C. tora