The Value of the Tree of Life

Soltis, Douglas E.; Soltis, Pamela S.

doi:10.1016/b978-0-12-812553-3.00005-9

Cited by 2 publications

(4 citation statements)

References 79 publications

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“…8a; Supplementary Dataset). Notably, the majority of genes in this network evolved within PS4, which marks the first appearance of the plant embryo 8 . In contrast, just 12 embryonic transcripts (9.23%) are identified from algae (PS3), comprising plants that do not contain embryos.…”

Section: Discussionmentioning

confidence: 99%

“…This embryo-containing central region was fixed in Farmer’s Fixative (Ethanol:Acetic acid=3:1). After fixation, the samples were dehydrated, cleared, embedded and sectioned as described previously 8, 9 . Tissue sections were mounted on PEN membrane slides (Leica Microsystems, Deer Park, IL) pre-treated at 180 °C for 4 hours followed by UV irradiation at 254 nm for 30 minutes.…”

Section: Methodsmentioning

confidence: 99%

“…Chronological descriptions of the phylotypic stage are problematic for plants, where embryogenesis extends throughout the life cycle and the mid-point of seed maturation is morphologically and chronologically variable among taxa 7 . Here we use multiplexed spatial-transcriptomic analyses to investigate the homology of the grass embryo, which evolved ∼ 150 million years since the divergence of eudicots and grasses 8 . Our data support a model where the single maize embryonic leaf (cotyledon) is a novel, bi-partite organ derived within the monocotyledonous grasses, after the evolution of the ancestral angiosperm cotyledon from a modified embryonic leaf 9, 10 .…”

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confidence: 99%

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Multiplexed transcriptomic analyses of the plant embryonic hourglass

Wu,

Zhang,

Niklas

et al. 2024

Preprint

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The embryo defines the primordial developmental stage of multicellular organisms, from fertilization of the zygote to the formation of tissue layers and organs. Animal zoologists described a period of maximum morphological similarity between embryos of different species within related taxa, later termed the phylotypic stage of mid-embryogenesis. Modern transcriptomic studies identified a phylotypic pattern of gene expression in Drosophila, zebrafish, and the flowering plant Arabidopsis, featuring enhanced accumulation of evolutionarily older and conserved transcripts during mid-embryogenesis. Such plots of transcriptomic age and divergence conform to the "hourglass models" of morphological similarities described by 19th century embryologists. Chronological descriptions of the phylotypic stage are problematic for plants, where embryogenesis extends throughout the life cycle and the mid-point of seed maturation is morphologically and chronologically variable among taxa. Here we use multiplexed spatial-transcriptomic analyses to investigate the homology of the grass embryo, which evolved around 150 million years since the divergence of eudicots and grasses. Our data support a model where the single maize embryonic leaf (cotyledon) is a novel, bi-partite organ derived within the monocotyledonous grasses, after the evolution of the ancestral angiosperm cotyledon from a modified embryonic leaf. We describe a maize embryonic-organ-initiation genetic-network that uses ancient and conserved genes, comprising a phylotypic pattern of "mid embryogenesis" during the ancestrally conserved initiation of histogenesis and organogenic growth in plant and animal embryos.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Multiplexed transcriptomic analyses of the plant embryonic hourglass

Wu,

Zhang,

Niklas

et al. 2024

Preprint

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“…18). Hennig's figure was reproduced in Nelson and Platnick (1981), Williams (1992), Knox (1998), and Soltis and Soltis (2019).…”

Section: A Rorschach Test For Systematistsmentioning

confidence: 99%

Hierarchies, classifications, cladograms and phylogeny

Brower

2023

Cladistics

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Figure 18 of Hennig's Phylogenetic Systematics (University of Illinois Press, Urbana, IL, 1966) shows a phylogenetic tree (a generative hierarchy) and what appear to be nested sets (an inclusive hierarchy) that he stated were two representations of the same pattern of relationships. This essay questions whether this is correct or not, explores the meanings of different hierarchical patterns, reviews various interpretations of Hennig's figure, and discusses the conceptual path from systematic evidence to phylogenetic explanation. The crux of the argument is that systematic hierarchies as we know them scientifically are nested sets that group theoretical entities based on patterns of synapomorphy. The notions of phylogeny and common ancestry reflect this hierarchical pattern.

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The Value of the Tree of Life

Cited by 2 publications

References 79 publications

Multiplexed transcriptomic analyses of the plant embryonic hourglass

Multiplexed transcriptomic analyses of the plant embryonic hourglass

Hierarchies, classifications, cladograms and phylogeny

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