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Structure, evolution, and comparative genomics of tetraploid cotton based on a high-density genetic linkage map

Update Time: 2016-04-19 10:50:00Click:5591 times
Ximei Li, Xin Jin, Hantao Wang, Xianlong Zhang and Zhongxu Lin.2016.DNA Research


A high-density linkage map was constructed using 1,885 newly obtained loci and 3,747 previously published loci, which included 5,152 loci with 4696.03 cM in total length and 0.91 cM in mean distance. Homology analysis in the cotton genome further confirmed the 13 expected homologous chromosome pairs and revealed an obvious inversion on Chr10 or Chr20 and repeated inversions on Chr07 or Chr16. In addition, two reciprocal translocations between Chr02 and Chr03 and between Chr04 and Chr05 were confirmed. Comparative genomics between the tetraploid cotton and the diploid cottons showed that no major structural changes exist between DTand D chromosomes but rather between ATand A chromosomes. Blast analysis between the tetraploid cotton genome and the mixed genome of two diploid cottons showed that most AD chromosomes, regardless of whether it is from the ATor DTgenome, preferentially matched with the corresponding homologous chromosome in the diploid A genome, and then the corresponding homologous chromosome in the diploid D genome, indicating that the diploid D genome underwent converted evolution by the diploid A genome to form the DTgenome during polyploidization. In addition, the results reflected that a series of chromosomal translocations occurred among Chr01/Chr15, Chr02/Chr14, Chr03/Chr17, Chr04/Chr22, and Chr05/Chr19.,%20evolution,%20and%20comparative%20genomics%20of%20tetraploid%20cotton%20based%20on%20a%20high-density%20genetic%20linkage%20map

pii: dsw016.(IF=5.477)