Abstract:
:Fusarium oxysporum is an ascomycetous fungus that is well-known as a soilborne plant pathogen. In addition, a large population of nonpathogenic F. oxysporum (NPF) inhabits various environmental niches, including the phytosphere. To obtain an insight into the origin of plant pathogenic F. oxysporum, we focused on the tomato (Solanum lycopersicum) and its pathogenic F. oxysporum f. sp. lycopersici (FOL). We collected F. oxysporum from wild and transition Solanum spp. and modern cultivars of tomato in Chile, Ecuador, Peru, Mexico, Afghanistan, Italy, and Japan, evaluated the fungal isolates for pathogenicity, VCG, mating type, and distribution of SIX genes related to the pathogenicity of FOL, and constructed phylogenies based on ribosomal DNA intergenic spacer sequences. All F. oxysporum isolates sampled were genetically more diverse than FOL. They were not pathogenic to the tomato and did not carry SIX genes. Certain NPF isolates including those from wild Solanum spp. in Peru were grouped in FOL clades, whereas most of the NPF isolates were not. Our results suggested that the population of NPF isolates in FOL clades gave rise to FOL by gaining pathogenicity.
journal_name
Microbes Environjournal_title
Microbes and environmentsauthors
Inami K,Kashiwa T,Kawabe M,Onokubo-Okabe A,Ishikawa N,Pérez ER,Hozumi T,Caballero LA,de Baldarrago FC,Roco MJ,Madadi KA,Peever TL,Teraoka T,Kodama M,Arie Tdoi
10.1264/jsme2.me13184subject
Has Abstractpub_date
2014-01-01 00:00:00pages
200-10issue
2eissn
1342-6311issn
1347-4405pii
DN/JST.JSTAGE/jsme2/ME13184journal_volume
29pub_type
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