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Protein fractions obtained from seeds of the jack bean (Canavalia ensiformis) as well as the amino acid canavanine, present in these seeds, were tested for their capacity to inhibit the growth of the phytopathogenic fungi Macrophomina phaseolina, Colletotrichum gloesporioides, Sclerotium rolfsii and Fusarium oxysporum. We found that most of the proteins examined and also canavanine did not have any effect on the growth of these fungi. On the other hand the toxic protein canatoxin was found to be effective, at a concentration of 2%, in the inhibition of the growth of M. phaseolina, C. gloesporioides and S. rolfsii. Frações protéicas obtidas de sementes de feijão-de-porco (Canavalia ensiformis), bem como o aminoácido canavanina presente nestas sementes, foram avaliadas em sua capacidade de inibir o crescimento dos fungos fitopatogênicos Macrophomina phaseolina, Colletotrichum gloesporioides, Sclerotium rolfsii e Fusarium oxysporum. Constatamos que a maior parte das proteínas examinadas e também canavanina não apresentaram nenhum efeito sobre o crescimento desses fungos. Por outro lado, a proteína tóxica canatoxina mostrou-se efetiva, a uma concentração de 2%, na inibição do crescimento de M. phaseolina, C. gloesporioides e S. rolfsii

The toxicity of jack bean [Canavalia ensiformis (L.) DC.] canatoxin to plant pathogenic fungi