2011
DOI: 10.1111/j.1399-3054.2011.01526.x
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Natural variation and persistent developmental instabilities in geographically diverse accessions of the allopolyploid Arabidopsis suecica

Abstract: Allopolyploids arise from the hybridization of two species concomitant to genome doubling. While established allopolyploids are common in nature and vigorous in growth, early generation allopolyploids are often less fertile than their progenitors and display frequent phenotypic instabilities. It is commonly assumed that new allopolyploid species must pass through a bottleneck from which only those lines emerge that have reconciled genomic incompatibilities inherited from their progenitors in their combined gen… Show more

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Cited by 15 publications
(22 citation statements)
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“…Our genome size measurements of diploid A. thaliana (143 Mb) and 4x A. suecica (344 Mb) confirmed earlier measurements for A. thaliana (Davison et al 2007) and A. suecica (Madlung et al 2012). The F 1 individual's genome size (249 Mb) was as expected very close in size to the average of the two parental genomes (244 Mb), suggesting an additive triploid genome.…”
Section: Resultssupporting
confidence: 88%
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“…Our genome size measurements of diploid A. thaliana (143 Mb) and 4x A. suecica (344 Mb) confirmed earlier measurements for A. thaliana (Davison et al 2007) and A. suecica (Madlung et al 2012). The F 1 individual's genome size (249 Mb) was as expected very close in size to the average of the two parental genomes (244 Mb), suggesting an additive triploid genome.…”
Section: Resultssupporting
confidence: 88%
“…While molecular events shaping genomic change during and immediately after allopolyploidization have been studied intensely (Chen 2010), less experimental attention has been given to the question of whether allopolyploidization leads to the formation of a single new species or whether it can result in evolutionary radiation. In the example of the natural allotetraploid A. suecica genetic variation among populations is low (Lind-Hallden et al 2002) and phenotypic differences between accessions are subtle (Madlung et al 2012). By contrast, in resynthesized A. suecica genomic variation is frequent but newly formed allopolyploids also display poor fertility, fecundity, and viability (Comai et al 2000), indicating that allopolyploidization presents a severe bottleneck.…”
Section: Discussionmentioning
confidence: 99%
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“…Finally, we wondered if developmental differences between the three species might affect our analysis since the three species used here flower at slightly different ages (see "Materials and Methods"). However, the concern that low photosynthetic rates, especially when comparing between A. arenosa and A. suecica, might be caused by immaturity of A. arenosa doesn't seem to be likely given that A. arenosa matures earlier than A. suecica (Comai et al, 2000;Madlung et al, 2012) Additionally, given that all three species had a similar number of adult leaves and bolting had not yet started at the time of analysis, it seemed reasonable to us to assume that all plants were both mature and not yet senescent.…”
Section: Discussion Hybrid Vigor In a Suecica Is Enhanced In Favorabmentioning
confidence: 99%