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The role of arbuscular mycorrhizae (AM) in the nitrogen (N) metabolism of host plants is not understood, and the mechanisms regulating N uptake and assimilation in AM are not known. Recently, a gene highly induced in mycorrhizal tobacco roots was cloned and characterized. Its deduced amino acid sequence showed a high degree of homology to urease accessory proteins (UreG). The differential regulation of ureG in AM suggests that arbuscular mycorrhizal fungi may alter N metabolism in the host plants, and/or that ureases may be important in controlling symbiosis development. The aim of this work was to determine whether urease activities are altered in mycorrhizal roots, and whether these alterations are related to changes in the rei ative abundance of free amino acids in shoots, and/or intraradical fungaI growth. Tobacco seedlings were inoculated with Glomus c/arum or Glomus intraradices, and grown in sterilized substrate containing 50, 1000r 150 mg N kgl , as urea or ammonium sulphate. Eight weeks after inoculation, the following parameters were evaIuated: shoot and root dry weight, intraradical fungaI growth, urease activities in roots, and free amino acid concentration in shoots. IntraradicaI colonization by G. c/arum was higher than by G. intraradices, at the different experimental conditions. Root coIonization by G. c/arum and G. intraradices

Atividade de ureases e concentração de aminoácidos em tabaco inoculado com fungos micorrízicos arbusculares