Data/hora: 23/09/2024 17:11:56

Biblioteca(s): 	Embrapa Agricultura Digital.	
Data corrente: 	20/07/2009	
Data da última atualização: 	11/11/2010	
Autoria: 	STANGARLIN, J. R.; PASCHOLATI, S. F.; FRANZENER, G.	
Afiliação: 	JOSÉ RENATO STANGARLIN, UNIOESTE; SÉRGIO F. PASCHOLATI, ESALQ/USP; GILMAR FRANZENER, UNIOESTE.	
Título: 	Phenols, B-1,3 glucanase, chitinase and phenylalanine ammonia-lyase activities in infection sites of Exserohilum turcicum in maize genotypes.	
Ano de publicação: 	2005	
Fonte/Imprenta: 	Summa Phytopathologica, Botucatu, v. 31, n. 3, p. 261-267, July/Sept. 2005.	
Idioma: 	Inglês	
Conteúdo: 	Resistant and susceptible maize inbreds were inoculated with the pathogen Exserohilum turcicum to compare biochemical responses in both interactions. Total phenolic compounds, and the activities of ?-1,3 glucanase, chitinase and phenylalanine ammonia-lyase were measured after inoculation with the pathogen. The production of fungitoxic compounds was evaluated by thin-layer chromatography using tissue samples. Fungal biomass inside infected tissues was determined by using ergosterol quantification as a parameter. The results showed that in the resistant maize inbred line, the infection site (called "primary infection site") was represented by chlorotic spots, with restricted colonization of the xylem vessel and mesophyll cells around it, accompanied by increases in the concentration of phenolic compounds and high ?-1,3 glucanase and chitinase activities. In the susceptible inbred, however, two types of infection sites were characterized. In the first, the primary infection site was represented by chlorotic spots, with moderate ?-1,3 glucanase and chitinase activities and restricted colonization by the fungus. In the second, necrotic lesions (secondary infection site) were seen away from the penetration area and, increases in the content of phenolic compounds, moderate activity of ?-1,3 glucanase and chitinase, and strong colonization ofmesophyll tissue: by the pathogen were detected. These results provide evidence for different patterns of lesion development in resistant and susceptible maize inbred lines following E. turcicum infection.	
Palavras-Chave: 	Atividade fungitóxica; Excerohilum turcicum; Híbridos de milho; Sítios de infecção.	
Thesagro: 	Zea Mays.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Agricultura Digital (CNPTIA)	
Exemplares: 	CNPTIA - (13462-1) - ADD - AP - PP -  -  -  - DIS