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Total phenol exudation of 2-cm root tips of intact plants of maize cv Lixis. Plants were precultured in 500 μm CaCl2 and 8 μm H3BO3 solution at pH 4.3 for 24 h without or with 1.4 mm Si. Then the roots of 10 plants were bundled and the tips (2 cm) were incubated for 2 h in 5 mL of the same solution with different Al and Si levels according to the treatments. Bars show sd, n = 4.
