Resistance to Fusarium oxysporum f. sp. melonis Race 1,2 in Muskmelon Lines Nad-1 and Nad-2

Abstract

Of seven doubled-haploid melon lines parthenogenetically originated using irradiated pollen, two lines, Nad-1 and Nad-2, were selected for resistance to Fusarium wilt after successive inoculations with F. oxysporum f. sp. melonis race 1,2w virulent isolate. Nad-1 and Nad-2 were compared with the commercial hybrids and with the parent cvs. Isabelle and Giallo di Paceco. Evaluation of germplasm extended over a 2-year period showed a higher resistance of Nad-1 and Nad-2 plants to Fusarium oxysporum f. sp. melonis race 1,2 than other genotypes tested in this study. The resistance expressed in the two doubled-haploid lines could be due to their homozygous state that maximizes the expression of the genes for resistance already present in the parental line Isabelle. The use of this source of resistance may be exploited commercially either in rootstocks or to facilitate breeding for F1 hybrids. Future research will concentrate on the identification of genetic markers associated with resistance to race 1,2 using these doubledhaploid lines.

Morphological and molecular characterization of melon accessions resistant to Fusarium wilts

“…This, together with the fact that most of the resistances to F.o.m race 1,2 are recessive and polygenically controlled (Risser and Rode 1973;Ficcadenti et al 2002) makes difficult its exploitation in breeding programs. Moreover, these accessions could be easily exploited as resistant rootstocks to F.o.m race 1,2.…”

“…Polygenic recessive genes have been found to confer resistance to race 1,2 in a few Far-Eastern accessions such as 'Ogon 9' and 'Piboule' (Risser and Rode 1973;Perchepied and Pitrat 2004). These accessions allowed breeding of partially resistant lines to race 1,2, such as 'Isabelle' (Risser and Rode 1973), and two doubled-haploid lines, 'Nad-1' and 'Nad-2' (Ficcadenti et al 2002).…”

Efficacy of Some Medicinal Plants Extracts for Potential Antifungal Activity

“…Crown and root rot caused by these fungi are reported (1). The species were isolated from several European countries, Asia, Africa and North America (2). In Iran, for the first time in 1964, the causal agent was isolated from melon in Mashhad (3).…”

Inheritance of race 1.2 Fusarium wilt resistance in four melon cultivars

“…However, partial resistance to race 1.2, under polygenic recessive gene control, has been only found in a few Far-Eastern accessions, such as 'Ogon 9' and 'Kogane Nashi Makuwa' (Risser and Rode 1973;Perchepied and Pitrat 2004), which are organoleptically distant from melons accepted by Western markets. These accessions allowed the development of partially resistant lines to race 1.2, such as 'Isabelle', two doublehaploid lines, 'Nad-1' and 'Nad-2', showing higher levels of resistance than other genotypes (Ficcadenti et al 2002), and 'Dinero', a melon hybrid used in this work. Recently, Herman and Perl-Treves (2007) described a near complete resistance to race 1.2 conferred by two complementary recessive genes in the breeding line ' BIZ', and Oumouloud et al (2009) reported the possible existence of partial resistance to this race in some inodorus accessions of Western origin.…”