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O objetivo deste trabalho foi avaliar a influência do Mg na absorção do Zn e do Mn em quatro cultivares de soja. Utilizou-se a técnica de cinética de absorção por raízes destacadas. As raízes foram colocadas em frascos com as seguintes combinações: três doses de Mg (1,0, 3,0 e 6,0 mmol L-1) x cinco doses de Zn ou Mn (0,5, 1,0, 2,0, 5,0 e 10,0 mimol L-1), com três repetições. Com pipetador, foi colocado 14,8 MBq de radiozinco ou de radiomanganês. Após uma hora de exposição, as raízes foram lavadas e secadas em estufa; em seguida foram pesadas e determinou-se a radioatividade. Os valores foram convertidos em micromoles por grama de matéria seca. Foram estimadas as variáveis Km e Vmax pela equação de Lineweaver & Burk. As cultivares apresentaram comportamentos distintos na absorção de Mg, Mn e Zn; a inibição do Mg sobre o Zn e o Mn na soja é do tipo não competitiva, e as variáveis Km e Vmax comportaram-se de modo independente no processo de absorção. The objective of this work was to evaluate the influence of Mg in the absorption of Mn and Zn in four soybean cultivars. Excised roots were used in the assays of absorption kinetics. The roots were placed in solutions with the following combinations: three concentrations of Mg (1.0, 3.0 and 6.0 mmol L-1) x five concentrations of Zn or Mn (0.5, 1.0, 2.0, 5.0 and 10.0 mumol L-1), with three replicates. To each of these solutions 14.8 MBq of radiozinc or radiomanganese was pipetted. After one hour of exposure, the roots were washed, ovendried, weighted, and the absorbed radioactivity determined. The obtained values were converted to micromoles per gram of dry matter. The Km and Vmax estimated values were determined by the Lineweaver & Burk transformation. The soybean cultivars showed an effect of noncompetitive inhibition between Mg and Zn and between Mg and Mn. The cultivars had distinct behavior in absorption of Mg, Mn and Zn. The Km and Vmax values were mutually independent in the absorption process of roots

Influência do magnésio na absorção de manganês e zinco por raízes destacadas de soja