Abstract
New resistance genes to root-knot nematodes ( Meloidogyne spp.) could be identified in a flower-ornamental peach cultivar ‘Juseitou’, based on linkage analysis between its resistance loci and DNA markers. Two DNA markers EAA/MCAT10 (STS) and pchgms1 (SSR) reported to be linked to the nematode resistance loci Mi and Mij of ‘Nemared’ [Theor. Appl. Genet. 99 (1999) 115; Theor. Appl. Genet. 101 (2000) 421] were analysed and mapped in an F 2 population derived from a cross between ‘Juseitou’ and susceptible ‘Akame’. These two markers, which showed a significant linkage in our mapping population, did not show any linkages with the resistance loci to M. incognita and M. javanica of ‘Juseitou’. These results suggest that the nematode resistance character of ‘Juseitou’ is different from that of ‘Nemared’ and is controlled by new genes. Four STS (sequence tagged site) markers, tightly linked to the resistance genes of ‘Juseitou’, were successfully developed. Among them, the STS-834b marker co-segregated with the resistance gene to M. javanica. The STS markers obtained will be utilized for the introgression of new root-knot nematode resistance genes from ‘Juseitou’ into peach rootstocks.
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