Abstract: The purpose of the present study was to contribute to the literature on the role of organic acids in Al tolerance in maize (Zea mays L.). Treatment with increasing Al concentrations from 100 to 1000 μM for 4 days Al caused substantial inhibition of lateral roots, as well as severe alterations on root apices. In roots, the malate content was decreased significantly by Al. However, the citrate, lactate and total organic acids were not affected by Al. In shoots, the citrate, tartarate and total organic acids were decreased significantly by 100, 250 and 500 μM Al. However, the succinate was increased by 500 and 1000 μM Al, while that of lactate increased only by 1000 μM Al. Only the highest Al concentration 1000 μM induced exudation of citrate. It is shown that the enhanced citrate exudation induced by Al support the concept that organic acid exudation may be an effective strategy to cope with soil acidity and Al toxicity in maize.