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Two soybean (Glycine max) cultivars were used in this study, Ocepar 4, rated as moderately resistant to Meloidogyne incognita race 3 but susceptible to M. javanica, and 'BR 16', susceptible to both nematodes. The effect of nematodes infection on the uptake and transport of N, P and Ca to the shoot was studied in plants growing in a split root system. The upper half was inoculated with 0, 3,000, 9,000 or 27,000 eggs/plant while the lower half received 15N, 32P or 45Ca. Infected plants showed an increase of root but a decrease of shoot mass with increasing inoculum levels. In general, total endogenous nutrients increased in the roots and tended to decrease in the shoots with increasing inoculum levels. When concentrations were calculated, there was an increase in the three nutrients in the roots, and an increase of Ca but no significant variation of N and P was observed in the shoots. The total amount of 15N in the roots increased at the highest inoculum levels but 32P and 45Ca decreased. In the shoots there was a reduction of 32P and 45Ca. The specific concentrations of the labelled nutrients (abundance or radioactivity/tissue mass) also showed a decrease of 32P and 45Ca in the shoots and roots of infected plants and an increase of 15N in the shoots. Considering that overall nutrient concentrations reflect cumulative nutrient uptake and the data from labelled elements gave information at a specific moment of the infection, thus nematodes do interfere with nutrient uptake and translocation. Duas cultivares de soja (Glycine max) foram usadas neste estudo, Ocepar 4, moderadamente resistente a Meloidogyne incognita raça 3, mas suscetível a M. javanica, e 'BR 16', suscetível a ambos nematóides. O efeito da infecção de nematóides na absorção e transporte de N, P e Ca para a parte aérea foi estudada em plantas crescendo em um sistema da raízes divividas, sendo a parte superior das raízes inoculada com 0, 3.000, 9.000 ou 27.000 ovos/planta, enquanto a inferior recebeu 15N, 32P ou 45Ca. Plantas infetadas mostraram aumento de raízes, mas diminuição da massa da parte aérea com o aumento do inóculo. De modo geral, as quantidades endógenas totais dos elementos estudados aumentaram nas raízes e tenderam a diminuir na parte aérea com o aumento do inóculo. Quando os dados foram expressos em concentração do elemento/massa de tecido, observou-se aumento para os três elementos nas raízes e aumento de Ca na parte aérea. A quantidade total de 15N nas raízes aumentou no maior nível de inóculo, havendo diminuição de 32P e 45Ca. Na parte aérea, houve redução de 32P e 45Ca. As concentrações específicas dos elementos marcados (abundância ou radioatividade/massa de tecido) também mostrou diminuição de 32P e 45Ca na parte aérea e raízes de plantas infetadas, e aumento de 15N na parte aérea. Considerando que as quantidades endógenas dos elementos refletem a absorção cumulativa e que os dados de elementos marcados fornecem informação de um momento específico da infecção, nematóides interferem de fato com a absorção e translocação de nutrientes

Uptake and translocation of nitrogen, phosphorus and calcium in soybean infected with Meloidogyne incognita and M. javanica