Data/hora: 26/05/2024 03:47:09

Biblioteca(s): | Embrapa Meio-Norte.
Data corrente: | 14/10/1998
Data da última atualização: | 02/02/2012
Autoria: | VAILLANCOURT, L. J.; HANAU, R. M.
Título: | Genetic and morphological comparisons of Glomerella (Colletotrichum) isolates from maize and from sorghum.
Ano de publicação: | 1992
Fonte/Imprenta: | Experimental Mycology, v.16, n.3, p.219-229, 1992.
Idioma: | Inglês
Conteúdo: | Genetic and morphological comparisons of Glomerella (Colletotrichum) isolates from maize and from sorghum. Various morphological and genetic characteristics were compared among six isolates of Colletotrichum from maize and six from sorghum. For the first time, a teleomorph was induced in sorghum isolates by pairing them on autoclaved sorghum leaves in a humidity chamber. The sorghum teleomorph was morphologically similar to Glomerella graminicola and Glomerella tucumanensis, the teleomorphs of Colletotrichum isolates from maize and from sugarcane, respectively. Mating tests demonstrated that Glomerella isolates from maize and sorghum were not interfertile. Several small but consistent differences in the morphologies of the isolates from maize and from sorghum were observed which agreed with earlier reports. DNA fingerprints detected as restriction fragment length polymorphisms of mitochondrial DNA and random polymorphic DNA (RAPD) produced from nuclear DNA by the polymerase chain reaction could be used to reliably and unambiguously distinguish members of the two groups of isolates. Results of a statistical analysis of similarity of the RAPD fingerprints suggested that maize and sorghum isolates of Colletotrichum are only about 45% similar and represent two distinct and separate genetic lineages. We conclude that isolates of Colletotrichum from maize and sorghum are sibling species since they are morphologically very similar but reproductively completely isolated.
Palavras-Chave: | Características morfologicas; Genetic; Maize; Morphological comparisons; Sorghum.
Thesagro: | Fungo; Milho; Sorgo.
Thesaurus Nal: | Colletotrichum; Glomerella.
Categoria do assunto: | --
Registro original: | Embrapa Meio-Norte (CPAMN)
Exemplares: | CPAMN - (5895-1) - ADC - SP - -- - S 11407 -  - S 11407 - DIS