Abstract
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.
http://www.ncbi.nlm.nih.gov/pubmed/?term=Structure,%20evolution,%20and%20comparative%20genomics%20of%20tetraploid%20cotton%20based%20on%20a%20high-density%20genetic%20linkage%20map
pii: dsw016.（IF=5.477）
PMID:27084896