Data/hora: 16/06/2024 09:45:45

Biblioteca(s): | Embrapa Agricultura Digital.
Data corrente: | 06/07/2009
Data da última atualização: | 26/06/2012
Autoria: | OSSWALD, W. F.; STANGARLIN, J. R.; NICHOLSON, R. L.; BRUMMER, M.; WULFF, N. A.; DI PIERO, R. M.; PICCININ, E.; DI CIERO, L.; HOTO, F. V.; PASCHOLATI, S. F.
Afiliação: | WOLFGANG F. OSSWALD, Technical University of Munich; JOSE R. STANGARLIN, ESALQ/USP; RALPH L. NICHOLSON, Purdue University; MARIA BRUMMER, Technical University of Munich; NELSON A. WULFF, ESALQ/USP; ROBSON M. DI PIERO, ESALQ/USP; EVERALDO PICCININ, ESALQ/USP; LUCIANA DI CIERO, ESALQ/USP; FABIANA V. HOTO, ESALQ/USP; SERGIO F. PASCHOLATI, ESALQ/USP.
Título: | The effect of acibenzolar-S-methyl on phytoalexin and PR-protein induction on sorghum mesocotyls and on Colletotrichum sublineolum.
Ano de publicação: | 2004
Fonte/Imprenta: | Summa Phytopathologica, Botucatu, v. 30, n. 4, p. 415-420, Oct./Dec. 2004.
Idioma: | Inglês
Conteúdo: | Treatment of sorghum mesocotyls with the chemical activator benzo(1, 2, 3) thiadiazole-7-carbothioic acid S-methyl ester (BTH, acibenzolar-S-methyl) caused an induction of the phytoalexin apigeninidin.The induction became visible with 5 ppm BTH after an incubation time of 30 hours. The synthesis of three constitutively expressed B-1,3-glucanase isoforms was inhibited by BTH, but no significant effect of BTH was seen on the induction of a sorghum chitinase as demonstrated by immunoblotting experiments with specific antibodies. Besides these effects on sorghum mesocotyls, BTH inhibited spore germination, germ tube and appressorium formation of the sorghum pathogen, Colletotrichum sublineolum. Spore germination and germ tube formation was significantly reduced with 5 ppm BTH, whereas inhibition of appressorium formation started with 10 ppm BTH. Finally, we demonstrated that mycelial growth of the pathogen was also reduced between 50 and 80% with 100 and 200 ppm BTH. Thus, BTH might act on the host pathogen interaction between sorghum and C. sublineolum as a fungitoxic compound and simultaneously as a resistance inducer.
Palavras-Chave: | Ativador químico; B-1,3-glucanases; Benzotiadiazole; BTH; Mesocótilos de sorgo; Quitinases; Resistência induzida.
Thesaurus Nal: | Colletotrichum sublineolum.
Categoria do assunto: | --
Registro original: | Embrapa Agricultura Digital (CNPTIA)
Exemplares: | CNPTIA - (13277-1) - ADD - AP - PP -  -  -  - DIS