Iowa State University Brigham Young University University of Georgia

Fiber Evolution

Introgression Populations
Homoeolog-specific Profiling
Genetic Networks & Phenotype
Effects of Selection
Sequence Capture

Genetic and Physical mapping resources
Comparative BAC Sequencing
Genome Sequence Resources
EST D-genome map
EST Resources

Web Database
Education and Outreach
Significance for cotton industry
Cotton Literature
Cotton Links
Wendel Lab
PGML (Paterson Lab)
Udall Lab

Lists & protocols
How to
CEGC Site Search

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
turn explanations on/off


As Gossypium diversified and colonized arid and semi-arid regions around the globe it underwent extensive chromosomal evolution. Collective observations of pairing behavior, chromosome size, and relative fertility in interspecific hybrids led to the designation of single-letter genome symbols for related clusters of species. Presently, eight diploid genome groups (A through G, plus K) are recognized among the 50 species in the genus. These genome groups have been shown to correspond to natural lineages, and in most cases, these lineages are also geographically cohesive. Polyploidization has occurred in CottonFiber. Gossypium hirsutum and G. barbadense are classic allopolyploids, tracing to an improbable hybridization of an African/Asian A-genome and an American D-genome species perhaps 1-2 MYA.

We welcome your comments and suggestions.