A RAPD marker, linked to the Tm-2(a) gene engendering TMV resistance i
n tomatoes, was identified. The validity of the RAPD marker was corrob
orated by screening several tomato varieties, and correctly identifyin
g those which carried Tm-2(a), as well as by F-2 segregation analysis.
All tested resistant varieties descending from a common Lycopersicon
peruvianum/esculentum ancestor, LA1791, exhibited this marker.