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Originally published as Genetics Published Articles Ahead of Print on June 8, 2005.
Genetics, Vol. 170, 1979-1988, August 2005, Copyright © 2005
doi:10.1534/genetics.104.037788
Aneuploidy and Genetic Variation in the Arabidopsis thaliana Triploid Response
Isabelle M. Henry*,
Brian P. Dilkes*,
Kim Young
,
Brian Watson*,
Helen Wu* and
Luca Comai*,1
* Department of Biology, University of Washington, Seattle, Washington 98195-5325
Fred Hutchinson Cancer Research Center, Seattle, Washington 98109
1 Corresponding author: Department of Biology, University of Washington, 1521 NE Pacific St., Seattle, WA 98195-0001.
E-mail: comai{at}u.washington.edu
Polyploidy, the inheritance of more than two genome copies per cell, has played a major role in the evolution of higher plants. Little is known about the transition from diploidy to polyploidy but in some species, triploids are thought to function as intermediates in this transition. In contrast, in other species triploidy is viewed as a block. We investigated the responses of Arabidopsis thaliana to triploidy. The role of genetic variability was tested by comparing triploids generated from crosses between Col-0, a diploid, and either a natural autotetraploid (Wa-1) or an induced tetraploid of Col-0. In this study, we demonstrate that triploids of A. thaliana are fertile, producing a swarm of different aneuploids. Propagation of the progeny of a triploid for a few generations resulted in diploid and tetraploid cohorts. This demonstrated that, in A. thaliana, triploids can readily form tetraploids and function as bridges between euploid types. Genetic analysis of recombinant inbred lines produced from a triploid identified a locus on chromosome I exhibiting allelic bias in the tetraploid lines but not in the diploid lines. Thus, genetic variation was subject to selection contingent on the final ploidy and possibly acting during the protracted aneuploid phase.
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