Linkage between Frl (Fusarium oxysporum f.sp. radicis-lycopersici resistance) and Tm-2 (tobacco mosaic virus resistance-2) loci in tomato (Lycopersicon esculentum).

摘要

A study was carried out on the linkage relationship between the Frl locus carrying resistance to F. oxysporum f.sp. radicis-lycopersici and the Tm-2 locus carrying resistance to several races of tobacco mosaic tobamovirus in the tomato inbred line IRB-301-31. The inbred line Motelle (Frl+/Frl+, Tm-2+/Tm-2+) was crossed with the inbred line IRB-301-31 (Frl/Frl, Tm-2/Tm-2). The resulting 222 F2 plants were selfed and, from each F3 family groups of 15-60 seedlings, tested for resistance to either F. oxysporum f.sp. radicis-lycopersici or tobacco mosaic tobamovirus race 0. Segregation data indicated a very tight linkage between Frl and Tm-2, equal to 5.1?.07 map units.