Do Asexual Polyploid Lineages Lead Short Evolutionary Lives? A Case Study From the Fern Genus Astrolepis

Beck, James B.; Windham, Michael D.; Pryer, Kathleen M.

doi:10.1111/j.1558-5646.2011.01362.x

Cited by 50 publications

(60 citation statements)

References 55 publications

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“…Essentially, the short-term ecological advantages of asexual reproduction are balanced by the long-term effect of lower diversification rates. This hypothesis is consistent with reported evidence for shortlived apomictic lineages, for example, the derived fern genus Astrolepis [5], and the developmental feature changes required for the loss of sexuality in plants [3]. However, it is inconsistent with other studies that recover evidence for species rich lineages that lack any reported evidence for at least rare sexual events [6,7], and a recent study on the eudicot genus Oenothera, which shows "increasing diversification associated with loss of sexual recombination and segregation" [4].…”

Section: Introductionsupporting

confidence: 81%

“…In this lineage we did not find a correlation between speciation/extinction rates and apomixis (see results of BiSSE analyses). Nevertheless, the analyses of the polystichoid dataset did support the hypothesised association of apomixis and reticulate evolution involving polyploidy [5,17,[20][21][22][23]. The main caveat here is that polyploidy alone is insufficient to confirm reticulation because chromosome numbers do not provide sufficient evidence to distinguish between auto-and allopolyploidy.…”

Section: Discussionmentioning

confidence: 87%

“…Polyploidy and reticulate evolution are strongly linked with the occurrence and establishment of apomixis in both ferns and angiosperms [5,[17][18][19][20][21][22][23]. This link is especially true for triploid and pentaploid taxa [13,19,23].…”

Section: Introductionmentioning

confidence: 99%

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The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

Dyer

Guo

et al. 2012

Journal of Botany

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The disparate distribution of apomixis between the major plant lineages is arguably one of the most paradoxical phenomena in plant evolution. Ferns are particularly interesting for addressing this issue because apomixis is more frequent than in any other group of plants. Here, we use a phylogenetic framework to explore some aspects of the evolution of apomixis in ferns and in particular in the polystichoid ferns. Our findings indicate that apomixis evolved several times independently in three different clades of polystichoid ferns. A lineage-wide perspective across ferns indicates a correlation between apomixis and the species richness of lineages; however BiSSE tests did not recover evidence for a correlation of apomixis and diversification rates. Instead, evidence was recovered supporting an association between the establishment of apomixis and reticulate evolution, especially in the establishment of triploid hybrids. Diversification time estimates supported the hypothesis of short living apomictic lineages and indicated a link between the establishment of apomixis and the strengthening of the monsoons caused by the lifting of the Qinghai-Tibetan plateau. In general our results supported the hypothesis for the rare establishment of apomictic lineages, high extinction risks, and low speciation rates.

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Section: Introductionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 87%

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The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

Dyer

Guo

et al. 2012

Journal of Botany

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“…The idea that ploidy affects organismal ecology has a long history (Vandel, 1928;Stebbins, 1938;Suomalainen, 1950;Cavalier-Smith, 1978;Bell, 1982;Levin, 1983;Bierzychudek, 1985), but there is still no consensus on whether there are definitive advantages or costs of polyploidy that can explain its frequency and distribution (Mable and Otto, 1998;Mable, 2001;Ramsey and Schemske, 2002;Zeyl, 2004;Buggs and Pannell, 2007;Gerstein and Otto, 2009;Soltis et al, 2010;Beck et al, 2011;Mayrose et al, 2011;Ramsey, 2011). The advantages and disadvantages of polyploidy and its relevance to the distribution and maintenance of sex have been reviewed extensively (Bierzychudek, 1985 The ecological consequences of polyploidy are difficult to empirically disentangle from those directly related to asexuality, with which it is so often associated (Bierzychudek, 1985;Otto and Whitton, 2000;Hörandl, 2006;Mable et al, 2011).…”

Section: Consequences Of High P Content For Asexual Ecologymentioning

confidence: 99%

Can resource costs of polyploidy provide an advantage to sex?

2012

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The predominance of sexual reproduction despite its costs indicates that sex provides substantial benefits, which are usually thought to derive from the direct genetic consequences of recombination and syngamy. While genetic benefits of sex are certainly important, sexual and asexual individuals, lineages, or populations may also differ in physiological and life history traits that could influence outcomes of competition between sexuals and asexuals across environmental gradients. Here, we address possible phenotypic costs of a very common correlate of asexuality, polyploidy. We suggest that polyploidy could confer resource costs related to the dietary phosphorus demands of nucleic acid production; such costs could facilitate the persistence of sex in situations where asexual taxa are of higher ploidy level and phosphorus availability limits important traits like growth and reproduction. We outline predictions regarding the distribution of diploid sexual and polyploid asexual taxa across biogeochemical gradients and provide suggestions for study systems and empirical approaches for testing elements of our hypothesis.

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“…It is doubtful that the apogamous hybrid is only alive for a short time period and would be soon extinct. Recently, it has been revealed that the asexual Astrolepis taxa exit 7 to 47 times younger than sexual parents (Beck et al, 2011). Could this signify that the apogamous ferns have much shorter lives than sexual ferns?…”

Section: Fern Speciation Under Hybridizationmentioning

confidence: 99%

Species Occurrence, Hybridization and Speciation in Postglacial East and South Asia

Liao¹,

Chao²,

Chiang³

2012

The Molecular Basis of Plant Genetic Diversity

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Do Asexual Polyploid Lineages Lead Short Evolutionary Lives? A Case Study From the Fern Genus Astrolepis

Cited by 50 publications

References 55 publications

The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

The Evolutionary Dynamics of Apomixis in Ferns: A Case Study from Polystichoid Ferns

Can resource costs of polyploidy provide an advantage to sex?

Species Occurrence, Hybridization and Speciation in Postglacial East and South Asia

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