Submitted to: American Society of Horticulture Science Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 1/30/2001
Publication Date: 7/20/2001
Citation: Levi, A., Zhang, X., Thomas, C.E., Joobeur, T., Wehner, T.C. 2001. An initial genetic linkage map for watermelon. American Society of Horticulture Science Meeting. Hortscience 36:456.
Technical Abstract: An initial genetic linkage map was constructed for watermelon using a BC1 population [U.S. Plant Introduction accession (PI) 296341-FR (Fusarium resistant) x New Hampshire Midget (Fusarium susceptible)] x New Hampshire Midget. The map contains 154 RAPD markers produced by 106 primers, and includes a 700 bp SCAR marker that corresponds to a fragment produced by the RAPD primer GTAGCACTCC. This marker was previously reported as linked (3 cM) to race 1 Fusarium wilt resistance in watermelon. The markers segregated to 17 linkage groups. Of these, 10 groups included 8-18 markers, and 7 groups included 2-4 markers. The map covers a genetic linkage distance of 1086.3 cM. Each of the 10 large linkage groups contained segments with no or with low levels of recombination events among markers (0-2.7 cM), indicating that the watermelon genome may contain large conserved chromosomal regions. The map should be useful for identification of markers closely linked to genes that control fruit quality and Fusarium wilt (races 1 and 2) resistance in watermelon.