A genetic map of cucumber composed of RAPDs, RFLPs, AFLPs, and loci conditioning resistance to papaya ringspot and zucchini yellow mosaic viruses

A genetic linkage map for watermelon derived from a testcross population: (Citrullus lanatus var. citroides × C. lanatus var. lanatus) × Citrullus colocynthis

“…The highly heterochromatic short arm of chromosome 10 of rice shows a lower recombination frequency than the euchromatic long arm of this chromosome (Cheng et al 2001). Dense regions with low recombination events are also indicated in the map constructed for cucumber (Park et al 2000;Bradeen et al 2001). Further studies are needed to determine the nature and location of these regions in the watermelon genome.…”

“…They are also useful for positional cloning of genes and elucidating the genetic basis of complex traits that do not display Mendelian segregation (Lee 1995). Extensive genetic linkage maps have been constructed for major cucurbit species such as melon (Baudracco-Arnas and Pitrat 1996;Wang et al 1997;Brotman et al 2000;Dogimont et al 2000;Oliver et al 2000;Perin et al 2000) and cucumber (Park et al 2000;Staub and Serquen 2000). However, only a few small linkage maps have been constructed for watermelon (Navot and Zamir 1986;Navot et al 1990;Hashizume et al 1996;Hawkins et al 2001).…”

Genetic Mapping and Molecular Breeding in Cucurbits

“…hardwickii) F 2 populations, genetic maps 766 and 480 cM in length, respectively, were generated (Kennard et al 1994). Because of the small number of markers in these maps, the average distance between markers was significantly larger than in maps generated later (Park et al 2000;Bradeen et al 2001;Fazio et al 2003b). The densest of these (Park et al 2000) contained 347 markers and covered 816 cM, within a range of 750-1000 cM estimated by Staub and Meglic (1993).…”

“…Because of the small number of markers in these maps, the average distance between markers was significantly larger than in maps generated later (Park et al 2000;Bradeen et al 2001;Fazio et al 2003b). The densest of these (Park et al 2000) contained 347 markers and covered 816 cM, within a range of 750-1000 cM estimated by Staub and Meglic (1993). In squash, Brown and Myers (2002) created a RAPD map from BC 1 of C. pepo (A0449) × C. moschata (Nigerian Local) with 148 markers in 28 linkage groups covering 1954 cM (Table 5.1).…”

“…Park et al (2000) found that zym (zucchini yellow mosaic virus resistance), while co-segregating with E15/M47-F-197, was 2.2 cM from Prsv-2 (papaya ring spot virus resistance) and 5.2 cM from AFLP markers E14/M50-F-69, E14/M50-F-140, and E15/M50-F-221 (Table 5.2). Bradeen et al (2001) in cucumber identified RFLP marker CMTC51 and AFLP marker E14/M19-F-158-P2 that flanked a scab resistance gene (Ccu) at 0.5 cM and 1.9 cM, respectively.…”