Maps in Cotton, Molecular genetic map, Gossypium hirsutum, Dipolid cotton, Tetraploid cotton, Polymorphism, Linkage groups

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Maps in cotton
A number of molecular genetic maps have been prepared in cotton, most of them for tetraploid upland cotton (Gossypium hirsutum) with AADD genomic constitution, but some of them also for diploid cotton (G. herbaceum) with AA genomic constitution. The mapping populations used for mapping the genome of tetraploid cotton, generally consisted of F₂ or F₂₃ (bulk-sampled plots) or DR lines derived from interspecific cross G. hirsutumx G. barbadense. Some of these maps included the following: (i) In 1998, a detailed restriction fragment length polymorphism (RFLP) map, was prepared for tetraploid cotton, in which 705 RFLP loci, assembled into 41 linkage groups, covered a genetic distance of 4675 cM.

The genomic origin (A vsD) of most, and chromosomal identity of 14 (of 26) linkage groups was shown. (ii) Another molecular linkage map was constructed using 58 doubled haploid plants derived from the interspecific cross G. hirsutum x G. barbadense. Among a total of 624 marker loci (510 SSRs and 114 RAPDs), 489 loci were ass mbled into 43 linkage groups and covered - 3,314.5 centi-Morgans (cM). (iii) A joinmap from four populations comprising 284 loci spanning a genetic distance of approximately 1,500 cM was also published in 2001. This was the first genetic linkage joinmap assembled in G. hirsutum with a core of RFLP markers assayed on different genetic backgrounds of cotton populations (Acala, Delta, and Texas plain). These maps taken together also demonstrated that there are duplicate loci for many markers due to homoeologous relationships between the two genomes (A and D) that are present in tetraploid cotton.

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