Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Annu Rev Genet. 2008;42:443-61. doi: 10.1146/annurev.genet.42.110807.091524.

Evolutionary genetics of genome merger and doubling in plants.

Author information

  • 1Department of Plant Biology, Cornell University, Ithaca, New York 14850, USA. jjd5@cornell.edu

Abstract

Polyploidy is a common mode of evolution in flowering plants. The profound effects of polyploidy on gene expression appear to be caused more by hybridity than by genome doubling. Epigenetic mechanisms underlying genome-wide changes in expression are as yet poorly understood; only methylation has received much study, and its importance varies among polyploids. Genetic diploidization begins with the earliest responses to genome merger and doubling; less is known about chromosomal diploidization. Polyploidy duplicates every gene in the genome, providing the raw material for divergence or partitioning of function in homoeologous copies. Preferential retention or loss of genes occurs in a wide range of taxa, suggesting that there is an underlying set of principles governing the fates of duplicated genes. Further studies are required for general patterns to be elucidated, involving different plant families, kinds of polyploidy, and polyploids of different ages.

PMID:
18983261
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Atypon
    Loading ...
    Write to the Help Desk