A SSR-based composite linkage map of Arachis hypogaea based on three RIL populations. Based on the maps of three RIL populations, a composite map was constructed. The composite linkage maps consist of 22 composite linkage groups with 175 SSR marker loci. Linkage analysis was performed with JoinMap using a minimum LOD score of 3.0 and linkage maps were drawn using MapChart for Windows. Underlined markers were EST-SSRs. Markers that showed significant distortions from 1:1 segregation are indicated by *. Markers that amplified two loci are designated by an Arabic number (-1 or -2) appended to the locus name to distinguish the two loci 1 and 2 after the marker name.