NDLI: Aneuploidy and Genetic Variation in the Arabidopsis thaliana Triploid Response

Content Provider	PubMed Central
Author	Henry, Isabelle M. Dilkes, Brian P. Young, Kim Watson, Brian Wu, Helen Luca, Comai
Copyright Year	2005
Abstract	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.
Related Links	http://dx.doi.org/10.1534/genetics.104.037788
Starting Page	1979
File Format	PDF
ISSN	00166731
Journal	Genetics
Issue Number	4
Volume Number	170
Language	English
Publisher	Genetics Society of America
Publisher Date	2005-08-01
Access Restriction	Open
Rights Holder	Genetics Society of America
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics

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