Potential Role of Transposable Elements in the Rapid Reorganization of the Fusarium oxysporum Genome

Alarming occurrence of Fusarium wilt disease in pea (Pisum sativum L.) cultivations of Jabalpur district in Central India revealed by an array of pathogenicity tests

“…Chromosome rearrangement mediated by transposon has been studied in F. oxysporum. This suggests that transposable elements could be agents of rapid genomic reshuffle in natural populations of F. oxysporum, consequently providing an adaptive suppleness for this fungus (Daviere et al, 2001).…”

Pulsed field gel electrophoresis reveals chromosome length and number differences in Brazilian strains of Metarhizium Anisopliae

“…These differences were attributed mainly to translocations (Orbach et al, 1988 andTalbot et al 1991) and other chromosomal rearrangements (Masel et al, 1990). Davière et al (2001) observed a correlation between the high level of chromosomal polymorphism in F. oxysporum and concentrations of transposables elements (TEs) but these elements were not detected in M. anisopliae. In M. anisopliae, recombinants were obtained by parasexuality (Bagagli et al, 1991;Messias and Azevedo, 1980;Valadares-Inglis and Azevedo, 1997) but, in some cases it was extremely difficult to produce heterokaryons and stable recombinants between some strains.…”

“…Molecular sizes of the chromosomal DNAs were estimated with reference to the size standards, using Kodak 1D Imaging Analysis Software. Differences in chromosome number and length are common not only in Metarhizium anisopliae (Shimizu et al, 1992, Valadares-Inglis andPeberdy, 1998) but also in other fungi such as Cladosporium fulvum (Talbot et al 1991), Neurospora crassa (Orbach et al, 1988), Colletotrichum gloeosporioides (Masel et al, 1990), Ustilago hordei (McCluskey and Mills, 1990), Fusarium solani (Bruschi and Nazareth, 1994;Suga et al 2002) and Fusarium oxysporum (Davière et al, 2001). These differences were attributed mainly to translocations (Orbach et al, 1988 andTalbot et al 1991) and other chromosomal rearrangements (Masel et al, 1990).…”

The biology and potential for genetic research of transposable elements in filamentous fungi

“…The activity of the fot1 and impala transposons and of other elements has been shown by chromosome rearrangements detected by analysis of the electrophoretic karyotype, this analysis also showing a grouping of transposons in some regions and a correlation between the high level of chromosome polymorphisms and transposable element concentration (Davière et al, 2001). In F. oxysporum chromosome duplications and gene rearrangements of the skippy LTR retrotransposon were also induced by growth under nutritional stress in the presence of potassium chlorate (Anaya and Roncero, 1996).…”

“…Karyotypic instability has been investigated in species carriers of many families of transposons such as F. oxysporum and M. grisea. The analysis of the karyotypic instability showed a high level of chromosome length polymorphism with a high density of transposons and that the occurrence of chromosome rearrangements is associated with the clustering of transposable elements on the chromosomes (Davière et al, 2001;Hua-van et al, 2000;Nitta and Farman, 1997). These changes are reported as being genetically neutral, but can also lead to genetic combinations important for adaptation to new environments.…”