The co-dominant AFLP marker was successfully converted into simple and applied SCAR markers.Two

special SCPM166 and SCPM66 were designed according to the sequence information of AFLP fragments.The SCAR-PCR

result showed that the resistant parent,resistant F₂ plants and hybrid plants possessed 166 bp fragment,while

the susceptible parent and susceptible F₂ plants did not possess any fragments by primer SCPM166.This

indicated that the SCAR marker could identify susceptible homozygous single plant.The susceptible

parent,susceptible F₂ plants and hybrid plants possessed 66 bp fragment,while the resistant parent and

resistant F₂ plants did not possess any fragments by primer SCPM66.This indicated that the SCAR marker could

identify homozygous resistant single plant.By joint application of these 2 dominant SCAR markers,homozygous

resistant plant and homozygous susceptible plant could be identified simultaneously.It is equivalent to a

commonly dominant SCAR marker.