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Once more unto the breach, dear friends: Resolving the origins and relationships of the Pellaea wrightiana hybrid complex.
Am J Bot. 2022 05; 109(5):821-850.AJ

Abstract

PREMISE

The taxonomic status of Wright's cliff brake fern, Pellaea wrightiana, has been in dispute ever since it was first described by Hooker in 1858. Previously published evidence suggested that this "taxon" may represent a polyploid complex rather than a single discrete species, a hypothesis tested here using a multifaceted analytical approach.

METHODS

Data derived from cytogenetics, spore analyses, leaf morphometrics, enzyme electrophoresis, and phylogenetic analyses of plastid and nuclear DNA sequences are used to elucidate the origin, relationships, and taxonomic circumscription of P. wrightiana.

RESULTS

Plants traditionally assigned to this taxon represent three distinct polyploids. The most widespread, P. wrightiana, is a fertile allotetraploid that arose through hybridization between two divergent diploid species, P. truncata and P. ternifolia. Sterile triploids commonly identified as P. wrightiana, were found to be backcross hybrids between this fertile tetraploid and diploid P. truncata. Relatively common across Arizona and New Mexico, they are here assigned to P. ×wagneri hyb. nov. In addition, occasional sterile tetraploid plants assigned to P. wrightiana are shown here to be hybrids between the fertile allotetraploid and the tetraploid P. ternifolia subsp. arizonica. These tetraploid hybrids originated independently in two regions of parental sympatry (southern Arizona and west Texas) and are here assigned to P. ×gooddingii hyb. nov.

CONCLUSIONS

Weaving together data from a diversity of taxonomic approaches, we show that plants identified as P. wrightiana represent three morphologically distinguishable polyploids that have arisen through repeated hybridization events involving the divergent sexual taxa P. ternifolia and P. truncata.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Windham MD
Department of Biology, Duke University, Durham, 27708, NC, USA.
Huiet L
Department of Biology, Duke University, Durham, 27708, NC, USA.
Metzgar JS
Department of Biological Sciences, Virginia Tech, Blacksburg, 24061, VA, USA.
Ranker TA
School of Life Sciences, University of Hawai'i at Mānoa, Honolulu, 96822, HI, USA.
Yatskievych G
Billie L. Turner Plant Resources Center, University of Texas, Austin, 78712, TX, USA.
Haufler CH
Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, 66045, KS, USA.
Pryer KM
Department of Biology, Duke University, Durham, 27708, NC, USA.

MeSH

PhylogenyPolyploidyPteridaceaeTetraploidy

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

35568966

Citation

Windham, Michael D., et al. "Once More Unto the Breach, Dear Friends: Resolving the Origins and Relationships of the Pellaea Wrightiana Hybrid Complex." American Journal of Botany, vol. 109, no. 5, 2022, pp. 821-850.
Windham MD, Huiet L, Metzgar JS, et al. Once more unto the breach, dear friends: Resolving the origins and relationships of the Pellaea wrightiana hybrid complex. Am J Bot. 2022;109(5):821-850.
Windham, M. D., Huiet, L., Metzgar, J. S., Ranker, T. A., Yatskievych, G., Haufler, C. H., & Pryer, K. M. (2022). Once more unto the breach, dear friends: Resolving the origins and relationships of the Pellaea wrightiana hybrid complex. American Journal of Botany, 109(5), 821-850. https://doi.org/10.1002/ajb2.1850
Windham MD, et al. Once More Unto the Breach, Dear Friends: Resolving the Origins and Relationships of the Pellaea Wrightiana Hybrid Complex. Am J Bot. 2022;109(5):821-850. PubMed PMID: 35568966.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Once more unto the breach, dear friends: Resolving the origins and relationships of the Pellaea wrightiana hybrid complex. AU - Windham,Michael D, AU - Huiet,Layne, AU - Metzgar,Jordan S, AU - Ranker,Tom A, AU - Yatskievych,George, AU - Haufler,Christopher H, AU - Pryer,Kathleen M, Y1 - 2022/05/14/ PY - 2022/03/09/revised PY - 2022/01/05/received PY - 2022/03/10/accepted PY - 2022/5/16/pubmed PY - 2022/6/3/medline PY - 2022/5/15/entrez KW - Pteridaceae KW - cytogenetics KW - enzyme electrophoresis KW - ferns KW - morphometrics KW - plastid and nuclear phylogeny KW - spores SP - 821 EP - 850 JF - American journal of botany JO - Am J Bot VL - 109 IS - 5 N2 - PREMISE: The taxonomic status of Wright's cliff brake fern, Pellaea wrightiana, has been in dispute ever since it was first described by Hooker in 1858. Previously published evidence suggested that this "taxon" may represent a polyploid complex rather than a single discrete species, a hypothesis tested here using a multifaceted analytical approach. METHODS: Data derived from cytogenetics, spore analyses, leaf morphometrics, enzyme electrophoresis, and phylogenetic analyses of plastid and nuclear DNA sequences are used to elucidate the origin, relationships, and taxonomic circumscription of P. wrightiana. RESULTS: Plants traditionally assigned to this taxon represent three distinct polyploids. The most widespread, P. wrightiana, is a fertile allotetraploid that arose through hybridization between two divergent diploid species, P. truncata and P. ternifolia. Sterile triploids commonly identified as P. wrightiana, were found to be backcross hybrids between this fertile tetraploid and diploid P. truncata. Relatively common across Arizona and New Mexico, they are here assigned to P. ×wagneri hyb. nov. In addition, occasional sterile tetraploid plants assigned to P. wrightiana are shown here to be hybrids between the fertile allotetraploid and the tetraploid P. ternifolia subsp. arizonica. These tetraploid hybrids originated independently in two regions of parental sympatry (southern Arizona and west Texas) and are here assigned to P. ×gooddingii hyb. nov. CONCLUSIONS: Weaving together data from a diversity of taxonomic approaches, we show that plants identified as P. wrightiana represent three morphologically distinguishable polyploids that have arisen through repeated hybridization events involving the divergent sexual taxa P. ternifolia and P. truncata. SN - 1537-2197 UR - https://www.unboundmedicine.com/medline/citation/35568966/Once_more_unto_the_breach_dear_friends:_Resolving_the_origins_and_relationships_of_the_Pellaea_wrightiana_hybrid_complex_ DB - PRIME DP - Unbound Medicine ER -