Characterization of Phytophthora infestans (Mont.) De Bary. II. Subpopulations obtained from wild solanum Species
In the summer of 2000, isolates from natural infections of P.infestans (P.i.) were obtained from six wild species of Solanumplanted ex-profeso under rainfed conditions in the Toluca Valleyof México to determine possible host-pathogen specificity and forcharacterization regarding mating type (MT; A1,...
| Autores: | , , , |
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| Tipo de documento: | artigo |
| Estado: | Versão publicada |
| Data de publicação: | 2006 |
| País: | México |
| Recursos: | Universidad Michoacana de San Nicolás de Hidalgo |
| Repositório: | Redalyc-UMSNH |
| OAI Identifier: | oai:redalyc.org:30240305 |
| Acesso em linha: | https://www.redalyc.org/articulo.oa?id=30240305 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Agrociencias Isozymes mating type metalaxyl resistance |
| Resumo: | In the summer of 2000, isolates from natural infections of P.infestans (P.i.) were obtained from six wild species of Solanumplanted ex-profeso under rainfed conditions in the Toluca Valleyof México to determine possible host-pathogen specificity and forcharacterization regarding mating type (MT; A1, A2 ), sensitivityto metalaxyl, and the presence of allozymes of glucose-6-phosphateisomerase(Gpi) and peptidase (Pep). Solanum phureja and S. acaulepresented diverse degrees of severity of the disease amongindividuals of each population. The rest of the species wasuniformly resistant to the pathogen. Of 24 isolates from S. phureja,13 multilocus genotypes were detected, the most frequent of whichwas the A2 100/100 Gpi and 100/100 Pep (22%) and an A1:A2ratio of 0.6:1. Nine multilocus genotypes were found in thepopulation of P.i. obtained from S. acaule. The most commonone was also A2, 100/100 Gpi and 100/100 Pep (22% of suchpopulation too), with a MT proportion of 1:1. In S. bulbocastanum,no particular genotype was more common, and the only MT wasA1, nor was there a more frequent genotype found in S. caripense,where the proportion of MT A1:A2 was 0.25:1. The only genotyperecovered from S. muricatum was A1 86/11, 92/100 (Gpi, Pep),corresponding to US1. The two isolates from S. andreanum wereA1, 86/100 Gpi and 100/100 Pep. Solanum phureja and S. acaulehad the greatest frequency of isolates highly resistant to metalaxyl,and to a lesser degree of resistance those of S. caripense and S.muricatum. The isolates from S. bulbocastanum and S. andreanum,two species resistant to P.i., were A1 and susceptible to metalaxyl.All of the homothallic isolates were highly resistant to metalaxyl,and host-pathogen specificity was observed only in S. muricatum. |
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