Presence of putative pathogenicity genes in isolates of Fusarium oxysporum f. sp. cubense from Australia

Plant defense response against Fusarium oxysporum and strategies to develop tolerant genotypes in banana

“…Also genome data enabled the identification of genes for three additional proteins on chromosome 14, named as SIX5, SIX6 and SIX7 . Recently homologs of three Foc pathogenicity genes, SIX genes called SIX1, SIX7 and SIX8 were identified by Meldrum et al (2012). Insertional mutant banks of Fol generated by inserting the novel modified impala element (fungal transposon) can be used for further investigation of pathogenicity genes (Lopez-Berges et al 2009).…”

Post-transcriptional silencing of the SGE1 gene induced by a dsRNA hairpin in Fusarium oxysporum f. sp cubense, the causal agent of Panama disease

“…SIX proteins are directly involved in the infectious process of the host plant (Michielse et al, 2009). The presence of Six1 through Six10 has been reported in Fol (Rep et al, 2004;Lievens et al, 2009;Meldrum et al, 2012), and some of these genes have already been detected in Foc (Meldrum et al, 2012). Fol strains containing mutations in the SGE1 gene were unable to cause disease in tomato plants, although conidiogenesis was affected, albeit without altering the viability of the generated spores (Michielse et al, 2009).…”

Fusarium species associated with grain sorghum and mungbean in Queensland

“…The genetics of pathogenicity in Fol involves the expression of a number of effector genes (Rocha et al, 2016). Fourteen secreted in xylem (SIX) effector genes have since been identified in Fol and are most likely situated within the LS chromosome (Rocha et al, 2016, Rep et al, 2004 (Meldrum et al, 2012, Rocha et al, 2016.…”

“…According to Leslie and Summerell (2006) many races and formae speciales of F. oxysporum are based on observations of the disease on hosts, rather than on a genetic or evolutionary basis, and should therefore their genetic or evolutionary basis should not be assumed. Phylogenetic analyses of these formae speciales have revealed that many are polyphyletic and the origin for their pathogenic lineages is complex (Rocha et al, 2016, Meldrum et al, 2012. Recent studies have identified 14 secreted in xylem (SIX) genes, that likely relate to pathogenicity, and demonstrated horizontal gene transfer from a pathogenic to a non-pathogenic isolate of F. oxysporum f. sp.…”

“…lycopersici (Rep et al, 2004, Ma et al, 2010 oxysporum f. sp. cubense (Meldrum et al, 2012, Rocha et al, 2016. It is not known whether any SIX genes are present in F. oxysporum isolates associated with Fusarium wilt in mungbean.…”