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Cassava bacterial blight (CBB), caused by Xanthomonas axonopodis pv. manihotis, is considered one of the most important bacterial diseases of cassava (Manihot esculenta Crantz). In order to characterize the cassava genes involved in resistance to this disease, a genomic clone of a cationic peroxidase gene, MEPX1, was isolated by PCR from cassava cultivar MCOL 22. The DNA sequence of MEPX1 showed high homology with other plant peroxidase genes and contained a large intron typical of peroxidase genes. The predicted translation product showed a heme-ligand motif, also a characteristic of peroxidases, as well as phosphorylation, myristoylation and glycosylation sites. The amino acid sequence had 75 % homology with two Arabidopsis thaliana peroxidases. A Southern blot of 17 cassava cultivars, probed with MEPX1, showed multiple hybridization bands. Polymorphisms between cultivars generally reflected geographic origin, but there was also an association with resistance to CBB, indicating that MEPX1 could be a potentially useful marker for this trait. Uma das mais importantes doenças da mandioca (Manihot esculenta Crantz) é a bacteriose, causada pela Xanthomonas axonopodis pv. manihotis. Visando caracterizar genes de mandioca envolvidos na resistência a esta doença, um clone genômico do gene de peroxidase (MEPX1) foi isolado por meio de PCR. A sequência de nucleotídeos apresentou homologia com outros genes de peroxidase de plantas, contendo um intron, típico de genes de peroxidase. O produto de translação apresenta o domínio heme-ligante, característico de peroxidases, assim como domínios de fosforilação e glicosilação. A sequência de aminoácidos teve 75% de homologia com genes de peroxidase de Arabidopsis thaliana. Análise em Southern blot de 17 cultivares de mandioca, usando MEPX1 como sonda, apresentou polimorfismos que, além de refletirem a origem geográfica do material, demonstraram associação com resistência ou tolerância a bacteriose, indicando que MEPX1 pode vir a ser explorado como marcador para esta importante doença em programas de melhoramento de mandioca

Cloning of a peroxidase gene from cassava with potential as a molecular marker for resistance to bacterial blight