Data/hora: 22/06/2024 11:46:22

Biblioteca(s): | Embrapa Meio-Norte.
Data corrente: | 17/05/1996
Data da última atualização: | 16/01/2024
Autoria: | APPEL, D. J.; GORDON, T. R.
Título: | Local and regional variation in populations of Fusarium oxysporum fromagricultural field soils
Ano de publicação: | 1994
Fonte/Imprenta: | Phytopathology, v. 84, n. 8, p. 786-791, 1994.
Idioma: | Inglês
Conteúdo: | Population of Furasium oxysporum were sampled from two agricultural fields in Maryland. Among 197 isolates, 56 vegetative compatibility groups (VCGs) and 25 mitochondrial DNA (mtDNA) haplotypes were identified.Fift-four VCGs, representing 97% of the VCG diversity and 92% of the mtDNA haplotypes, were found among 78 isolates that were not pathogenicto muskmelon. The remaining two VCGs included 115 isolates of F. o. melonis: 40 isolates in VCG 0131 (races 0, 1, and 2) and 75 in 0134 (races 1 and 1,2). This is the first report from North America of race 1,2, for which there is presently no resistance in muskmelon. The two VCGs associated with virulent isolates also included four nonpathogenic isolates. Only one VCG and four mtDNA haplotypes overlapped between thetwo locations sampled. Sixty nonpathogenic VCGs of F. oxysporum previously identified from the San Joaquin Valley of California, were pairedwith representative isolates of the 54 VCGs from Maryland; only one VCG was sahared between these populations. Based on parsimony analysis of the mtDNA data, the Maryland nonpathogens were more closely related to F. o. melonis than to the California nonphatogens. One nonphatogen shared the mtDNA haplotype of VCG 0131 but lacked pathogenicity to muskmelon. The other nonpathogen within VCG 0131 and two in VCG 0134 deffered in mtDNA haplotype from the pathogens within these groups and were not closely related to them, except for their shared vegetative compatibility phenotype.
Palavras-Chave: | Furasium oxysporum; Furasium wilt; Variabilidade.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
Registro original: | Embrapa Meio-Norte (CPAMN)
Exemplares: | CPAMN - (1040-1) - ADC - AP - PP - S 10777 -  - 0010777 - DIS