Abstract Detail

Polyploidy, microevolution and species level systematics

Soltis, Douglas [1], Chester, Michael [2], Soltis, Pamela [3].

The early stages of genome evolution in newly formed polyploids.

Most naturally occurring polyploids or polyploid crops formed many thousands or millions of years ago. Through the study of synthetic polyploids as well as the investigation of several naturally occurring polyploids that formed in just the past several hundred years, it has been possible to piece together the early stages of genome evolution in young polyploids. These studies have revealed that there is no one “model”—different polyploid systems have emphasized different types of genomic change. Changes include rapid and extensive chromosomal repatterning, homeolog loss, gene silencing, subfunctionalization, methylation, and genome dominance of one diploid parent. Some changes are associated with the initial hybridization event whereas other changes occur post-polyploidization and may require many subsequent generations to reach fixation in natural populations. There is also evidence that some genomic changes are hard wired—the same genomic changes occur in populations of independent origin or in separate synthetic lines. Similarly, the same types of genomic change that occurred following ancient polyploidization in a given lineage can be noted after just a few generations in young polyploids.

Broader Impacts:

1 - University of Florida, Biology and Florida Museum of Natural History, Gainesville, FL, 32605, USA
2 - University of Florida, Department of Biology, Gainesville, FL, 32605, USA
3 - University of Florida, Florida Museum of Natural History, PO BOX 117800, Gainesville, FL, 32611-7800, USA

Keywords:
genome evolution
genome doubling
Polyploidy.

Presentation Type: Symposium or Colloquium Presentation
Session: C9
Location: Belle-Chasse/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 2:00 PM
Number: C9002
Abstract ID:348
Candidate for Awards:None