Summary A study was carried out on the linkage relationship between the Frl locus carrying resistance to Fusarium oxysporum f.sp. radicis‐lycopersici and the Tm‐2 locus carrying resistance to several races of tobacco mosaic virus 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‐l). The resulting 222 F2 plants were selfed, and from each F3 family groups of 15–60 seedlings were tested for resistance to either F. oxysporum f.sp. radicis‐lycopersici or tobacco mosaic virus race 0. Segregation data indicated a very tight linkage between Frl and Tm‐2, equal to 5.1 ± 1.07 map units.
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Vakalounakis et al. (1997) studied this question.