14C-photo assimilation, IAA and GA3 contents in Maize treated with aluminum

This study was carried out to show the effect of different concentrations of aluminum (0.0, 0.1, 1.0 and 10 m M Al) on the ''14C-photo assimilation and contents of IAA (indole acetic acid) and GA3 (gibberellic acid) in maize plants grown in nutrient solution. Results of 14C-photo assimilation showed that, the highest loss of 14C was in plants treated with 10 m M Al while the lowest loss was in plants treated with 0.1 m M Al throughout the experimental period. 14C in ethanolic extract of plants treated with 1.0 and 10 m M Al was higher than that of control (0.0 Al) while 0.1 m M Al reduced 14C in ethanol extract than the control plants. In contrast to 14C in the ethanol extract, 0.1 m M Al increased 14C-bound in tissue while 1.0 and 10 m M Al decreased it as compared with the control. Al affected both IAA and GA3 contents in the same manner where slight increases were observed due to 0.1 m M and the maximum increase was observed in plants treated with 1.0 m M Al