Figure 3. Amplification patterns of the DNA fragments with the simple sequence repeat (SSR) primer Satt 114 in 34 plants of the F₂ population derived from J05 x Essex and two parents on 6% nondenaturing polyacrylamide gel. P₁, J05; P₂, Essex; R, resistant F₂ plant; S, susceptible F₂ plant. Lane M is a 100-bp molecular-weight marker.