Abstract
SummaryMaize (Zea mays L.) inbred lines were grown in nutrient solution with different levels of Al and P to study their genetic variability for Al tolerance. Plant measurements for determining inbred line responses to Al were also evaluated. The best traits to assess maize for Al tolerance were seminal and adventitious root lengths.Brazilian maize inbred lines were more tolerant to Al for the traits measured than USA inbred lines when grown in nutrient solution. Most inbred lines tested showed decreased root lengths, but a few Brazilian lines were not affected by the Al levels used. At higher Al levels most Brazilian lines were not affected as severely as the USA lines. Tolerance of the inbred lines to Al was increased by inclusion of P in nutrient solutions. The greatest Al-induced decrease in root length generally occurred at the lowest P level. The combination of 185 μmol AlL−1 and 45 μmol P L−1 in nutrient solutions was the best combination of Al and P to evaluate maize genotypes for Al tolerance in this study.
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