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Os generos Arachis, Stylosanthes e Aeschynomene, pertencentes, a tribo Aeschynomeneae, sao nodu-lados por varios tipos diferentes de rizobios. Essas bacterias formam um grupo de inoculacao alta-mente heterogeneo, normalmente conhecido como rizobio tropical. Dois experimentos foram con-duzidos em casa de vegetacao utilizando-se vasos de Leonard sob condicoes estereis, para avaliacao da faixa de especificidade hospedeira de rizobio isolado de nodulos das raizes de plantas da tribo Aeschynomene, e da sua eficiencia simbiotica. Testaram-se vinte estirpes de rizobios isoladas de Arachis hypogaea (cv. BR 1), 5tylosanthes guyanensis e Aeschynomene americana cultivadas em amostras de solos da regiao nordeste do Brasil. as isolados usados como inoculantes provieram de plantas de caupi (Vigna unguic.ulata), siratro (Macropitilium atropurpureum) e amendoim (Arachis hypogaea). No segundo experimento vinte estirpes tambem foram testadas nas seguintes especies: A. hypogaea, S. guyanensis, A. americana, V. unguiculata e M. artropurpureum. Macropitilium atropurpureum foi capaz de nodular com todos os isolados testados, mas mostrou diferenca na eficiencia simbiotica. De outro lado, apenas oito isolados foram capazes de nodular o caupi. Esses resultados sugerem que isolados de rizobios da tribo Aeschynomene apresentam diferencas quanto a faixa hospedeira, indi-cando tambem a ocorreencia de diferentes grupos de inoculacao. The genus Arachis, 5tylosanthes and Aeschynomene which belong to the Aeschynomeneae tribe are nodulated by several different types of rhizobia. These bacteria form a highly heterogeneous inocu-lation group which is commonly known as tropical rhizobia. Two experiments were performed in greenhouse with Leonard jars under sterile conditions to evaluate the specificity host range of rhizo-bia isolated from root nodules of the Aeschynomeneae tribe, as well as its symbiotic efficiency. Twenty rhizobia strains isolated from Arachis hipogaea (cv. BR1), 5tylosanthes guyanensis and Aeschynome-ne americana cultivated in soil samples from the north-east region of Brazil were tested. The isolates were used as inoculant for cowpea (Vigna unguiculata), Macropitilium atropurpureum and peanut (Arachis hypogaea). In a second experiment twenty rhizobia strains were tested in A. hypogaea, S. guyanensis, A. americana, V. unguiculata e M. artropurpureum species. Peanut and Macropitilium atropurpureum were capable of nodulating with all isolates tested but differences were found regar-ding symbiotic efficiency. On the other hand, only 8 of the isolates were capable of nodulating co-wpea. These results suggest that rhizobial isolates from the Aeschynomene tribe display differences in the host range and should form different inoculation groups.

Faixa hospedeira de rizóbios isolados das espécies Arachis hypogaea, Stylosanthes guyanensis e Aeschynomene americana