Two high-density genetic maps have been constructed for papaya; one of them includes 1498 amplified fragment length polymorphism (AFLP) markers (Ma et al., 2004), while the other one includes 706 microsatellite loci (Chen et al., 2007). Both genetic maps were constructed using 54 F2 plants derived from cultivars AU9, Kapoho and SunUp with the papaya ringspot virus coat protein marker, morphological sex type, and fruit flesh color. Markers were mapped into 12 linkage groups.

A complementary CMap (a CGI application for displaying comparative maps) database running under MySQL using the Chado schema was created to accommodate both genetic maps (Ma et al., 2004; Chen et al., 2007).

References:

H. Ma, P. H. Moore, Z. Liu, M. S. Kim, Q. Yu, M.M.M. Fitch, T. Sekioka, A. H. Paterson, R. Ming. 2004. High-density linkage mapping revealed suppression of recombination at the sex determination locus in papaya. Genetics 166:419-436.

Chen C, Yu Q, Hou S, Li Y, Eustice M, Skelton R, Veatch O, Herdes RE, Diebold L, Saw J, Feng Y, Qian W, Bynum L, Moore PH, Paull RE, Alam M, Ming R (2007) Construction of a Sequence-Tagged High-Density Genetic Map of Papaya for Comparative Structural and Evolutionary Genomics in Brassicales. Genetics 177:2481-2491