Gels of DNA amplification products from soybean plants with
different susceptibility to frogeye leaf spot: a) marker CSOPA1800C in the
PB cross, b) marker CSOPA21,250C in the PB cross, c) marker
CSOUB11,100C in the UB cross. Lanes are as follows: 1, lambda phage
DNA digested with EcoRI, BamHI and HindIII (size markers); 2, resistant
cultivar; 3, susceptible cultivar; 4, resistant bulk; 5, susceptible bulk; 6-9,
resistant F2 plants; and 10-11, susceptible plants. Arrows indicate the
polymorphic DNA band.