Cloning of a peroxidase gene from cassava with potential as a molecular marker for resistance to bacterial blight
Braz. arch. biol. technol
; Braz. arch. biol. technol;46(2): 149-154, Mar. 2003. ilus, tab
Article
em En
| LILACS
| ID: lil-351387
Biblioteca responsável:
BR1.1
RESUMO
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 percent 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
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
Braz. arch. biol. technol
Assunto da revista:
BIOLOGIA
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Brasil
/
Canadá
País de publicação:
Brasil