Figure 9.

Effect of Si on total root length (A), root length of different root classes (B), and the number of root tips (C) of maize cv Lixis exposed to 0 and 25 μm Al in a basic solution containing 500 μm CaCl₂ and 8 μm H₃BO₃ at pH 4.3. Plants were precultured for 36 h without or with 1.4 mm Si and then treated without or with 25 μm Al for 44 h in the presence or absence of 1.4 mm Si. Bars show sd, n = 6. Significant differences between mean values are indicated by different letters at the P < 0.05 level (Tukey test).