Seed ferns and the origin of angiosperms

Doyle, James A.

doi:10.3159/1095-5674(2006)133[169:sfatoo]2.0.co;2

Cited by 229 publications

(272 citation statements)

References 163 publications

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“…Because of their uncertain phylogenetic placement (Bateman et al 2006, Burleigh and Mathews 2004, Doyle 2006, Doyle 2008), a confirmed appearance of torus-margo pits in this group could represent either retention of the plesiomorphic state from crown group conifers, or another independent origin in addition to Ginkgo.…”

Section: Discussionmentioning

confidence: 93%

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A physiologically explicit morphospace for tracheid-based water transport in modern and extinct seed plants

Wilson¹,

Knoll²

2010

Paleobiology

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Section: Discussionmentioning

confidence: 93%

“…Figure 2. A phylogenetic tree of taxa used in this study, based on Crane (1985), Doyle (2006), andJudd (2007). Extinct lineages are in dark grey, living plants are in light grey.…”

Section: Resultsmentioning

confidence: 99%

A physiologically explicit morphospace for tracheid-based water transport in modern and extinct seed plants

Wilson¹,

Knoll²

2010

Paleobiology

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“…This was accomplished through a parsimony phylogenetic analysis including representatives of the major living and extinct seed plant lineages, and combining morphological data (Doyle, 2006) for all taxa, with the highly-conserved molecular data for living taxa. The strict consensus of 30 most parsimonious trees is almost entirely resolved, and it identifi es three angiosperm stem relatives ( Figure 4A).…”

Section: Cg Fagalesmentioning

confidence: 99%

A Review of the Effect of Relaxed Clock Method, Long Branches, Genes, and Calibrations in the Estimation of Angiosperm Age

Magallón

2014

Bot. Sci.

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Abstract:The timing of angiosperm origin and diversifi cation is crucial to understand the evolution of terrestrial ecosystems as we know them today. The fossil record and relaxed molecular clocks provide substantially different estimates of the time in which angiosperms started to diversify into lineages that originated living species. The roles of different methodological and systematic factors on ages estimated with relaxed clocks across land plants, with a focus on angiosperms, are here reviewed. Different relaxed clocks and molecular data provided similar age estimates for nodes across land plants. Breaking the long branch subtending angiosperms typically did not result in substantially younger age estimates for angiosperms. Including or excluding fossil-derived calibrations on internal nodes had a pronounced effect on ages across the tree, and among examined factors, calibrations were the most infl uential in resulting ages. However, interactions between calibrations and genes were detected as different genes converged on similar ages when the same set of calibrations was applied. Estimated angiosperm ages were much older than angiosperm earliest fossils. Although a missing fossil history cannot be ruled out, this explanation alone is insuffi cient, considering the gradually increasing abundance, diversity and geographical distribution of angiosperms in the fossil record; the ordered progression of their morphological and functional diversifi cation; and the agreement in the sequence of appearance of lineages in the stratigraphic record and in molecular phylogenies. It is hypothesized that model misspecifi cation may play a role in the observed molecular clock/fossil discrepancy. Key words: calibrations, fossil record, land plants, lineage effects, model misspecifi cation.Resumen: La edad del origen y diversifi cación de las angiospermas son cruciales para entender la evolución de los ecosistemas terrestres modernos. El registro fósil y los relojes moleculares relajados calculan edades substancialmente diferentes para el inicio de la diversifi cación de las angiospermas. Se revisa el efecto de diferentes factores metodológicos y sistemáticos en los estimados de relojes relajados para las plantas terrestres, con énfasis en las angiospermas. Diferentes métodos de reloj relajado y datos moleculares estimaron edades similares en todo el árbol fi logenético. Romper la rama larga que subyace a las angiospermas no resultó en edades substancialmente más jóvenes. La inclusión o exclusión de calibraciones derivadas del registro fósil tuvo un efecto pronunciado en las edades estimadas, además de ser el factor más relevante entre los que se evaluaron. Sin embargo, existen interacciones entre las calibraciones y los genes, pues diferentes genes convergieron en edades similares cuando las mismas calibraciones fueron aplicadas. Las edades estimadas para las angiospermas son mucho más viejas que sus primeros fósiles. Aunque la posibilidad de un registro fósil incompleto no puede excluirse, ésta sola explicación es insufi ...

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“…Whereas morphological analyses associated living Gnetales in various ways with angiosperms, molecular analyses appear to be converging on trees with Gnetales nested within conifers (summarized in Burleigh and Mathews, 2004 ;Soltis et al, 2005 ). Morphological analyses that constrained Gnetale s to a position in conifers (Doyle, 2006(Doyle, , 2008 identifi ed fossil glossopterids , Pentoxylon , Bennettitale s and Caytonia as extinct outgroups of the angiosperms, but there is no consensus that any of these taxa are related to angiosperms (cf. Taylor and Taylor, 2009 ).…”

Section: Introductionmentioning

confidence: 99%