SciELO - Scientific Electronic Library Online

 
vol.48 número2Triticale: avaliação de linhagens em diferentes regiões paulistas índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Bragantia

versão impressa ISSN 0006-8705versão On-line ISSN 1678-4499

Resumo

MAZZAFERA, Paulo; GONCALVES, Wallace  e  FERNANDES, José Afonso Righetti. Phenols, peroxidase and polyphenoloxidase in the resistance of coffee to Meloidogyne incognita. Bragantia [online]. 1989, vol.48, n.2, pp.131-142. ISSN 1678-4499.  http://dx.doi.org/10.1590/S0006-87051989000200001.

Seedlings of two coffee cultivars were inoculated with the nematode Meloidogyne incognita: cv. Mundo Novo (susceptible) of Coffea arabica and cv. Apoatã (resistant) of C. canephora. During the larval penetration and adult female phases of the parasite, evaluations were made on phenol content, peroxidase and polyphenoloxidase activities. In the two evaluations, no differences were observed in roots and shoots growth among inoculated and non inoculated seedling. For both cultivars, only in the first phase infected seedlings showed an increase in phenols as compared to their counterparts not inoculated. However, phenol values were higher in the second than in the first phase. The cv. Mundo Novo had always higher phenols content than Apoatã. Only inoculated seedlings of the cv. Mundo Novo showed an increase of peroxidase activities in the first phase; but, both cultivars presented higher peroxidase activities in the second phase as compared to the first. Apoatã seedlings had always higher peroxidase and polyphenoloxidase activities than Mundo Novo. Infected seedlings of the cv. Apoatã showed in the first phase, only, an increase in polyphenoloxidase activity. Thin-layer chromatograms of phenolic extracts did not present any difference among inoculated and non-inoculated seedlings. Twenty three spots on the chromatograms were common to both cultivars, except that Apoatã had a further nine spots not found in Mundo Novo and the later had a further eleven not found in the former.

Palavras-chave : Coffee; nematodes; phenols; enzymes.

        · resumo em Português     · texto em Português | Inglês     · Português ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons