2014
DOI: 10.1111/nph.12954
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Emergence of apospory and bypass of meiosis via apomixis after sexual hybridisation and polyploidisation

Abstract: Hybridisation and polyploidy are major forces contributing to plant speciation. Homoploid (2x) and heteroploid (3x) hybrids, however, represent critical stages for evolution due to disturbed meiosis and reduced fertility. Apomixis – asexual reproduction via seeds – can overcome hybrid sterility, but requires several concerted alterations of developmental pathways to result in functional seed formation.Here, we analyse the reproductive behaviours of homo- and heteroploid synthetic hybrids from crosses between s… Show more

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Cited by 79 publications
(208 citation statements)
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References 62 publications
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“…Especially triploids could have paved way for evolution of apomixis by fixing and maintaining heterozygosity. Spontaneous apospory reported in Ranunculus triploids (Hojsgaard et al, 2014a) might lend additional support along this line. In addition, asynchronous gene expression from different genomes is thought to facilitate asexual re-programming in hybrids (Carman, 1997; Hojsgaard et al, 2014a).…”
Section: Discussionmentioning
confidence: 70%
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“…Especially triploids could have paved way for evolution of apomixis by fixing and maintaining heterozygosity. Spontaneous apospory reported in Ranunculus triploids (Hojsgaard et al, 2014a) might lend additional support along this line. In addition, asynchronous gene expression from different genomes is thought to facilitate asexual re-programming in hybrids (Carman, 1997; Hojsgaard et al, 2014a).…”
Section: Discussionmentioning
confidence: 70%
“…Spontaneous apospory reported in Ranunculus triploids (Hojsgaard et al, 2014a) might lend additional support along this line. In addition, asynchronous gene expression from different genomes is thought to facilitate asexual re-programming in hybrids (Carman, 1997; Hojsgaard et al, 2014a). As hybridity leads to “genomic shock” thus “genomic stress,” we may not be able to tease apart cause and consequence.…”
Section: Discussionmentioning
confidence: 70%
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“…Several studies have raised the possibility that alternative reproductive pathways, such as tetraspory or asexual reproduction through seeds (apomixis), evolved as a response to hybridization, genomic collisions, or unstable climatic environment (Carman, 1997;Voigt-Zielinski et al, 2012;Lovell et al, 2013;Hojsgaard et al, 2014). Segregating F2 populations of ecotypic crosses showed a continuous distribution of the frequency of ectopic configurations, suggesting that the genetic factors influencing the phenotype are quantitative and conserved among different ecotypes.…”
Section: Discussionmentioning
confidence: 99%
“…a) [96].b) [46].c)functional sexual seed, but with low rates of aposporous seeds (for details see [58]). …”
Section: Methodsmentioning
confidence: 99%