Physical linkage map of the tomato genome.

<p>Twelve linkage groups were constructed using 829 SSR markers (SSRs) and 96 RFLP markers (RFLPs). The names of the SSRs are marked to the right of each chromosome and the inter-distance in kb between each two adjacent SSRs is marked on the left. The Inter-distance in the figure means the physical distance between each two adjacent SSR markers and the black bar under inter-distances highlights some very large inter-distances with measurement unit Mb instead of kb. The markers in the bold font are the 96 RFLPs from the Tomato IL Map on the Sol Genomics Network (<a href="http://sgn.cornell.edu/" target="_blank">http://sgn.cornell.edu/</a>), and the 179 SSRs investigated previously undefined segments in 75 introgression lines from the cross between cv. M82 (<i>S. lycopersicum</i>) × LA0716 (<i>S. pennellii</i>). The thick black bar indicates the presumed heterochomatin region, between two SSRs marked with *. Euchromatin and heterochromatin regions were estimated based on previous reports and the released sequence data of the tomato genome on the Sol Genomics Network (<a href="http://sgn.cornell.edu/" target="_blank">http://sgn.cornell.edu/</a>). The SSR loci adopted from Tomato-EXPEN2000 Map <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0081091#pone.0081091-Fulton1" target="_blank">[29]</a> and the linkage map constructed by Shirasawa et al. <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0081091#pone.0081091-Shirasawa1" target="_blank">[30]</a> were marked with red and green color, respectively.