Aluminum toxicity is one of the major factors limiting plant growth in acid soils. Taro [Colocasiaesculenta (L.) Schott] cultivars `Lehua maoli' and `Bun long ' were grown in hydroponic solution at six levels of aluminum (0, 110, 220, 440, 890, and 1330 μM Al), to determine the differential response of taro to Al. Increasing Al levels resulted in significantly depressed fresh and dry weights of leaves, petioles, and roots, as well as leaf areas and root lengths. Significant cultivar differences were found, with `Lehua maoli' exhibiting greater leaf fresh weights and root lengths in the presence of Al, compared to `Bun long'. These cultivar differences were not associated with differences in Al concentrations of the leaves, petioles, or roots.
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