| Abstract Detail
Recent Topics Posters Dilkes, Brian [1], Josefsson, Caroline [2], Henry, Isabelle [2], Comai, Luca [3]. The ploidy hybridization barrier is controlled by a genetic network in A. thaliana. Polyploidy is frequently associated with speciation events in plants. Indeed, shifts in ploidy can result in reproductive isolation via postzygotic lethality and permit divergence of the two isolated populations. Using Arabidopsis thaliana natural variation and genomic resources we have identified a shared genetic mechanism for interploidy and interspecies F1 lethality. Remarkably, polyploid derivatives of different accessions of A. thaliana vary many-fold in their degree of reproductive isolation from diploids. Dissection of the genetic architecture of this variability via QTL analyses has identified both maternally and paternally derived genetic controls. The genes that underlie QTL on both sides are dosage-sensitive regulators of seed viability. Work to determine the identity of genes involved in the maternal control of the ploidy barrier has identified a critical requirement for the coordination of growth between the maternal sporophyte and fertilization products. This both identifies a role for processes other than genomic imprinting as mediators of interploidy and interspecies cross lethality, and highlights the potential role that conflict between parent and offspring may influence the evolution of seed traits.
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1 - UC Davis, Genome Center, Davis, CA, USA
2 - University of Washington, Biology, Seattle, WA, USA
3 - UC Davis, Genome Center and Section of Plant Biology, Davis, CA, USA
Keywords:
endosperm
seed development
testa
epigenetics
fitness.
Presentation Type: Recent Topics Poster
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P79037
Abstract ID:2708 |
