Ecological and phylogenetic approaches for diversification of apogamous ferns in Japan

Tanaka, Takayuki; Isaka, Yuichi; Hattori, Mitsuru; Sato, Toshiyuki

doi:10.1007/s00606-014-1036-6

Cited by 15 publications

(27 citation statements)

References 56 publications

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“…Recent analyses by Liu et al (2012) reveal that in ferns as a whole the frequency of apomixis is significantly correlated with species diversity; nevertheless, a further comparative probe into the polystichoid ferns did not expose any significant relationship between apomixis and diversification rates . These results are in agreement with recent studies showing that apomictic lineages themselves are apparently young, with initial estimates placing the ages of extant apomictic ferns in relatively recent evolutionary time (e.g., 0.4 my in Astrolepis, Beck et al, 2011; <8 my for the polystichoid ferns, Liu et al, 2012; <15 my for the crown groups of apogamous ferns in Japan, Tanaka et al, 2014).…”

Section: Recent Phylogenetic Insightssupporting

confidence: 92%

“…Surprisingly, these authors found that the frequency of apomixis among Japanese ferns declined with increasing latitude and elevation (temperature being correlated along both gradients). Their analyses also uncovered a strong correlation between increased seasonality of precipitation and the incidence of apomixis in the ferns of Japan, thought to be driven by the Asian monsoon (Tanaka et al, ). Apomixis is regularly observed within lineages that experience extreme fluctuations in water availability (e.g., within Pteridaceae; Fig.…”

Section: Apomixis In Ferns Since 2004mentioning

confidence: 97%

“…Few investigations have gone beyond untangling reticulate relationships to examine the broader evolutionary significance of apomixis in ferns. Recent studies, however, have made strides in this direction by uniting fossil, environmental, and molecular evidence (Liu et al, ; Tanaka et al, ). Tanaka et al () integrated such data to explore correlations between apomixis and abiotic factors in the ferns of Japan.…”

Section: Apomixis In Ferns Since 2004mentioning

confidence: 99%

“…Recent studies, however, have made strides in this direction by uniting fossil, environmental, and molecular evidence (Liu et al, ; Tanaka et al, ). Tanaka et al () integrated such data to explore correlations between apomixis and abiotic factors in the ferns of Japan. Surprisingly, these authors found that the frequency of apomixis among Japanese ferns declined with increasing latitude and elevation (temperature being correlated along both gradients).…”

Section: Apomixis In Ferns Since 2004mentioning

confidence: 99%

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A current perspective on apomixis in ferns

Grusz

2016

J of Sytematics Evolution

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This review provides a synopsis of apogamous reproduction in ferns and highlights important progress made in the study of fern apomixis over the past decade. First, a summary of the apomictic fern life cycle is provided, distinguishing between two pathways to diploid spore production that have been documented in apomictic ferns (premeiotic endomitosis and meiotic first division restitution) and briefly discussing the evolutionary implications of each. Next, recent trends in fern apomixis research are highlighted, exposing a shift in focus from the observation and characterization of apomixis in ferns to more integrated studies of the evolutionary and ecological implications of this reproductive mode. Peer-reviewed contributions from the past decade are then summarized, spanning the identification of new apomictic lineages through to the developmental, phylogenetic, and population genetic insights that have been made in studies of fern apomixis during that time. Gaps in our understanding of fern apomixis are also discussed, including the extent and implications of recombinant apomixis in ferns, the possible reversibility of reproductive mode (from apomictic to sexual) in ferns, and the genomic causes and consequences of apomixis in seed A u t h o r M a n u s c r i p t A u t h o r M a n u s c r i p t A u t h o r M a n u s c r i p tGrusz, 2 of 23 free vascular plants. Finally, future directions for fern apomixis research are discussed in the context of modern technological advances and recent insights from studies of apomixis in other groups.Keywords: apogamy, evolution of sex, meiosis, pteridophytes.A u t h o r M a n u s c r i p t A u t h o r M a n u s c r i p t A u t h o r M a n u s c r i p t Grusz, 3 of 23 "…apomixis is an escape from sterility, but it is an escape into a blind alley of evolution…" -Darlington, 1939A renaissance is underway in fern biology, propelled, in part, by technological advances being embraced by a growing research community. In particular, modern, cost-effective tools are enabling new inquiries into the unique fern life cycle, which alternates between independent, free-living sporophyte and gametophyte generations (Haufler et al., 2016). Among the many aspects of fern reproduction that are being examined in light of new approaches-and an improved understanding of fern evolution as a whole-is their propensity for apogamous reproduction (i.e., apomixis). This form of asexual reproduction (by spore or seed) is more common in ferns than in any other group of vascular plants. Nearly 10% of the ferns for which reproductive mode has been determined exhibit apomixis (Walker, 1985; Liu et al., 2012), compared to less than 1% in flowering plants (Bicknell & Koltunow, 2004; Becks & Alavi, 2015). Given that data on reproductive mode is lacking for the vast majority of ferns, this relative contribution of apomicts to fern diversity may well be an underestimate (Liu et al., 2012). The elevated frequency and distinctive meiotic characteristics of apomixis in ferns, which are elaborated upon bel...

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Section: Recent Phylogenetic Insightssupporting

confidence: 92%

Section: Apomixis In Ferns Since 2004mentioning

confidence: 97%

Section: Apomixis In Ferns Since 2004mentioning

confidence: 99%

Section: Apomixis In Ferns Since 2004mentioning

confidence: 99%

See 2 more Smart Citations

A current perspective on apomixis in ferns

Grusz

2016

J of Sytematics Evolution

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“…Similarly, polyploidy is argued to confer a set of advantages such as larger cells, more gene expression, less sensibility to deleterious mutations and more evolutionary potential thanks to gene redundancy [84], which might provide an advantage in colonizing harsher environments [85], although this argument should not be taken at face value. For instance, in a species of Japanese ferns, sexuals are found at higher latitudes, altitudes and colder places than parthenogens, as the latter's larger, polyploid cells are more sensitive to freezing owing to their high water content [16]. Because most asexual species featured in the geographic parthenogenesis literature are both hybrid and polyploid, disentangling these effects is tricky.…”

Section: (B) Models In Which Correlates Of Parthenogenesis Rather Thamentioning

confidence: 99%

What does the geography of parthenogenesis teach us about sex?

Tilquin

Kokko

2016

Phil. Trans. R. Soc. B

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One contribution of 15 to a theme issue 'Weird sex: the underappreciated diversity of sexual reproduction'. Theory predicts that sexual reproduction is difficult to maintain if asexuality is an option, yet sex is very common. To understand why, it is important to pay attention to repeatably occurring conditions that favour transitions to, or persistence of, asexuality. Geographic parthenogenesis is a term that has been applied to describe a large variety of patterns where sexual and related asexual forms differ in their geographic distribution. Often asexuality is stated to occur in a habitat that is, in some sense, marginal, but the interpretation differs across studies: parthenogens might not only predominate near the margin of the sexuals' distribution, but might also extend far beyond the sexual range; they may be disproportionately found in newly colonizable areas (e.g. areas previously glaciated), or in habitats where abiotic selection pressures are relatively stronger than biotic ones (e.g. cold, dry). Here, we review the various patterns proposed in the literature, the hypotheses put forward to explain them, and the assumptions they rely on. Surprisingly, few mathematical models consider geographic parthenogenesis as their focal question, but all models for the evolution of sex could be evaluated in this framework if the (often ecological) causal factors vary predictably with geography. We also recommend broadening the taxa studied beyond the traditional favourites.This article is part of the themed issue 'Weird sex: the underappreciated diversity of sexual reproduction'.

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Are rates of species diversification and body size evolution coupled in the ferns?

Testo

Sundue

2018

American J of Botany

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Our findings indicate that lineage diversification in ferns is largely decoupled from shifts in body size, in contrast to several other groups of organisms. Speciation in ferns appears to be primarily driven by hybridization and isolation along elevational gradients, rather than adaptive radiations featuring prominent morphological restructuring. The exceptional diversity of leaf morphologies in ferns appears to reflect a combination of ecophysiological constraints and adaptations that are not key innovations.

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Ecological and phylogenetic approaches for diversification of apogamous ferns in Japan

Cited by 15 publications

References 56 publications

A current perspective on apomixis in ferns

A current perspective on apomixis in ferns

What does the geography of parthenogenesis teach us about sex?

Are rates of species diversification and body size evolution coupled in the ferns?

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