Data/hora: 05/06/2024 02:28:23

Biblioteca(s): | Embrapa Meio-Norte.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - A
Data corrente: | 22/03/2008
Data da última atualização: | 09/11/2023
Autoria: | BARRETO, A. L. H.; VASCONCELOS, I. M.; GRANGEIRO, T. B.; MELO, V. M. M.; MATOS, T. E.; ELOY, Y. R. G.; FERNANDES, C. F.; TORRES, D. C.; FREIRE FILHO, F. R.; FREIRE, F. C. O.; OLIVEIRA, J. T. A.
Afiliação: | ANA LUCIA HORTA BARRETO, CPAMN; ILKA M. VASCONCELOS; FRANCISCO RODRIGUES FREIRE FILHO, CPAMN.
Título: | Infection process and host defense responses in compatible and incompatible interactions between Cowpea (Vigna unguiculata) and Colletotrichum gloeosporioides.
Ano de publicação: | 2007
Fonte/Imprenta: | International Journal of Plant Sciences, Chicago, v. 168, n. 2, p. 193-203, 2007.
ISSN: | 1058-5893
Idioma: | Inglês
Conteúdo: | The infection process of Colletotrichum gloeosporioides was examined by light microscopy on two cowpea genotypes, BR 3 Tracuateua and TE 97-411. In the susceptible genotype BR 3 Tracuateua, the pathogen acted as an intracellular hemibiotroph. Invasion of cowpea primary leaves occurred preferentially through the leaf epidermal cells by penetration tubes that emerged from appressoria. The penetration tube swelled within 48 h to form a spherical infection vesicle inside the epidermal cell in a biotrophic interaction. Subsequently, it became multilobed and multiseptated. By 4 d after inoculation, one or more large primary hyphae emerged from the lateral lobes and grew intracellularly and further colonized several adjacent epidermal host cells, characterizing the necrotrophic phase of infection. Primary leaves of the resistant cowpea genotype, TE 97-411, showed enhanced penetration resistance to C. gloeosporioides associated with higher epidermal H2O2 accumulation beneath appressoria and primary germ tubes, papilla formation, and increased phenylalanine ammonia-lyase activity, possibly related to accumulation of phenolic compounds and host cell wall lignification. Macroscopic examination of the primary leaves revealed the presence of shrunken necrotic lesions characteristic of anthracnose in infected BR 3 Tracuateua, whereas in the genotype TE 97-411, cell death was also observed but only in a reduced percentage of the infection sites. In summary, the results obtained in this study suggested that TE 97-411 is the resistant genotype to C. gloeosporioides compared with BR 3 Tracuateua because it developed more effective defense responses against the establishment of the pathogen.
Palavras-Chave: | Cowpea; Defense responses; Infection process.
Thesagro: | Colletotrichum Gloeosporioides.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Meio-Norte (CPAMN)
Exemplares: | CPAMN - (21745-1) - UPC - AP - PP - 194/08 -  - 2008.00194 - DIS