Race Distribution, Vegetative Compatibility and Pathogenicity of Fusarium oxysporum f. sp. melonis Isolates in Greece

Abstract

Races and vegetative compatibility groups (VCGs) inGreek isolates of Fusarium oxysporum f. sp. melonis (Fom) were characterized. Three races (0, 2 and 1-2) among 12 isolates tested and two VCGs among 19 isolates tested, were identified. Race 1-2 was the most common and race 1 was not detected. One widespread VCG corresponded to a VCG previously reported from Israel (coded 0138), and included seven isolates of races 0 and 1-2. The other VCG, which was unclassified, included four isolates of races 0, 2 and 1-2. The latter VCG was detected only in a specific melon-growing location of Evros. The remaining eight isolates tested for VCG did not show positive reactions with other isolates, with each other or with the testers of VCGs 0135 or 0138, although they produced complementary mutants. Using two inoculation methods, the local cv. ÔGolden HeadÕ was found susceptible to all known Fom races, and especially to race 1-2. These results show the presence of more than one VCG and the widespread distribution of the race 1-2, in Greece.www.blackwell-synergy.com

Current status of the taxonomic position of Fusarium oxysporum formae specialis cubense within the Fusarium oxysporum complex

“…dianthi (Aloi and Baayen, 1993;Kalc Wright et al, 1996;Migheli et al, 1998) and F. oxysporum f. sp. melonis (Elena and Pappas, 2006;Jacobson, 1991;Jacobson and Gordon, 1990;Katan et al, 1993). A notable exception is F. oxysporum f. sp.…”

Response of Wild Cucumis Species to Inoculation with Fusarium oxysporum f. sp. melonis Race 1,2y

“…melonis (Leach & Currence) W. C. Snyder & H. N. Hans., is regarded as a severe disease worldwide (Elena and Pappas, 2006;Kurt et al, 2002;Namiki et al, 1998;Zuniga et al, 1997). Once the disease colonizes a field, the pathogen survives in the soil because crop residues and roots of most crops grown in rotation with melon increase these persistent pathogenic populations (Banihashemi and Dezeeuw, 1975;Gordon et al, 1989;Zuniga et al, 1997).…”

Relationship between pathogenicity, race and vegetative compatibility grouping among Algerian populations of Fusarium oxysporum f. sp. pisi causing pea wilt

“…(Mohammadi and Mofrad 2009;Mohammadi et al 2012) and on various formae speciales of F. oxysporum (Belabid and Fortas 2002 Martín-Domínguez R., García-Benavides P., Crespo M.C., lycopersici (Katan and Katan 1999) and F. oxysporum f. sp. melonis (Elena and Pappas 2006). The results of the weak or partial vegetative compatibility observed between isolates of races 1 and 5 suggest a higher degree of similarity with isolates of race 1 than of races 2A and 2B.…”

“…That exchange of genetic material would be limited to compatible isolates within a VCG and so each VCG represents a genetically isolated population. Vegetative compatibility has been used to classify isolates of F. oxysporum belonging to distinct formal specials (Klein et al 2005), races within a special form (Elena and Pappas 2006) and special forms and/or races within or between different geographical origins (Di Primo et al 2002;Pasquali et al 2005). VCG has been used to distinguish between nonpathogenic and pathogenic populations on the same host species (Lori et al 2004).…”