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A drought-driven model for the evolution of obligate apomixis in ferns: evidence from pellaeids (Pteridaceae).

dc.contributor.author Grusz, Amanda L
dc.contributor.author Windham, Michael D
dc.contributor.author Picard, Kathryn T
dc.contributor.author Pryer, Kathleen M
dc.contributor.author Schuettpelz, Eric
dc.contributor.author Haufler, Christopher H
dc.date.accessioned 2021-11-09T16:32:28Z
dc.date.available 2021-11-09T16:32:28Z
dc.date.issued 2021-02-23
dc.identifier.issn 0002-9122
dc.identifier.issn 1537-2197
dc.identifier.uri https://hdl.handle.net/10161/23974
dc.description.abstract <h4>Premise</h4>Xeric environments impose major constraints on the fern life cycle, yet many lineages overcome these limitations by evolving apomixis. Here, we synthesize studies of apomixis in ferns and present an evidence-based model for the evolution and establishment of this reproductive strategy, focusing on genetic and environmental factors associated with its two defining traits: the production of "unreduced" spores (n = 2n) and the initiation of sporophytes from gametophyte tissue (i.e., diplospory and apogamy, respectively).<h4>Methods</h4>We evaluated existing literature in light of the hypothesis that abiotic characteristics of desert environments (e.g., extreme diurnal temperature fluctuations, high light intensity, and water limitation) drive the evolution of obligate apomixis. Pellaeid ferns (Cheilanthoideae: Pteridaceae) were examined in detail, as an illustrative example. We reconstructed a plastid (rbcL, trnG-trnR, atpA) phylogeny for the clade and mapped reproductive mode (sexual versus apomictic) and ploidy across the resulting tree.<h4>Results</h4>Our six-stage model for the evolution of obligate apomixis in ferns emphasizes the role played by drought and associated abiotic conditions in the establishment of this reproductive approach. Furthermore, our updated phylogeny of pellaeid ferns reveals repeated origins of obligate apomixis and shows an increase in the frequency of apomixis, and rarity of sexual reproduction, among taxa inhabiting increasingly dry North American deserts.<h4>Conclusions</h4>Our findings reinforce aspects of other evolutionary, physiological, developmental, and omics-based studies, indicating a strong association between abiotic factors and the establishment of obligate apomixis in ferns. Water limitation, in particular, appears critical to establishment of this reproductive mode.
dc.language eng
dc.publisher Wiley
dc.relation.ispartof American journal of botany
dc.relation.isversionof 10.1002/ajb2.1611
dc.subject Ferns
dc.subject Pteridaceae
dc.subject Droughts
dc.subject Germ Cells, Plant
dc.subject Apomixis
dc.title A drought-driven model for the evolution of obligate apomixis in ferns: evidence from pellaeids (Pteridaceae).
dc.type Journal article
duke.contributor.id Pryer, Kathleen M|0079353
dc.date.updated 2021-11-09T16:32:27Z
pubs.begin-page 263
pubs.end-page 283
pubs.issue 2
pubs.organisational-group Trinity College of Arts & Sciences
pubs.organisational-group Biology
pubs.organisational-group Duke Science & Society
pubs.organisational-group Duke
pubs.organisational-group Initiatives
pubs.organisational-group Institutes and Provost's Academic Units
pubs.publication-status Published
pubs.volume 108
duke.contributor.orcid Pryer, Kathleen M|0000-0002-9776-6736


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