Figure 1.

Phenotypes controlled by the I locus after inoculation with the NL3 strain of BNMV and genotypes of a tightly linked marker. (A) Ten-day-old seedling of Jamapa (II) showing local lesions and necrosis of the apical meristem 4 days after inoculation. (B) Three-and-a-half-week-old seedling of Calima (ii) showing symptoms of systemic mosaic 2 1/2 weeks after inoculation. (C) Ethidium-bromide-stained gel displaying the segregation of the codominant PCR-based Bng45 marker from the F₂ mapping population. The higher molecular weight amplicon is the Jampa allele (J) and the low molecular weight represents the Calima (C) allele.