RFLP patterns detected by the Pto gene in wild L.
hirsutum, L. esculentum, and near-isogenic
L. esculentum lines. Genomic DNA (3 μg) isolated from
each of the indicated lines was digested with EcoRI,
separated on a 1% agarose gel, and transferred onto Hybond N+
membrane. The membrane was hybridized to a 32P-labeled PCR
product of the Pto open reading frame and washed to a
stringency of 0.5× SSC at 65°C. Rio Grande-PtoR and TA537 contain
the Pto locus from L. pimpinellifolium,
Rio Grande-PtoS and TA209 contain the Pto locus from
L. esculentum, and 96T133-3 contains the
Pto locus from the L. hirsutum tomato
accession PI134418.