Cultivated allotetraploid cottons (Gossypium hirsutum and Gossypium barbadense) contain two subgenomes, At and Dt, which most cotton geneticists believe are derived from a spinnable fiber capable “A” genome species (Gossypium arboreum) [31] and a non-spinnable fiber capable “D” genome (Gossypium raimondii) [31,32]. Cotton polyploidization has altered the function of the A and D ancestral diploid genomes, conferring emergent properties, such as higher fiber yield and quality [17,36]. An RFLP-QTL mapping study showed that more QTLs associated with fiber quality and yield are located on the Dt subgenome than the At subgenome of the cultivated tetraploid, even though the ancestral D-genome diploid progenitor does not produce spinnable fibers [9].
Cotton (Gossypium spp.) is the leading fiber crop worldwide and an important oil crop. Cotton is a diploidized allopolyploid species containing two subgenomes designated At and Dt. It is a model system to study polyploidization and post-polyploidization of plants. To develop tools essential for the genetic improvement of cotton and research in polyploid plant genetics, a number of genetic linkage maps have been developed [1-8].
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