Litseoxylon gen. nov. (Lauraceae): The most ancient fossil angiosperm wood with helical thickenings from southeastern Asia

Huang, Liuqin; Sun, Jun; Jin, Jianhua; Quan, Cheng; Oskolski, Alexei A.

doi:10.1016/j.revpalbo.2018.08.006

Cited by 11 publications

(4 citation statements)

References 51 publications

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“…chunii Cheng discovered in the Late Pliocene's sediments of the Mangbang formation in Tengchong county, Yunnan Province, China, and a mummified fossil wood of Litseoxylon nanningensis gen. et sp. Nov. was identified from the Upper Oligocene Yongning Formation of the Nanning Basin, Guangxi Province, South China, by Huang et al [11]. Moreover, the origin and evolution of Litsea genera group sensu lato was discussed by Li [12], who pointed that this group originated at South Laurasia and North Gondwana, as well as the tropical coast of Tethys sea after Mid-Cretaceous; furthermore, the core genera of this group (Litsea and Lindera) probably originated and speciated ranging from South China to Indo-Malaysia, from where they migrated into tropical America and Australasia.…”

Section: Introductionmentioning

confidence: 99%

Comparative Chloroplast Genomics of Litsea Lam. (Lauraceae) and Its Phylogenetic Implications

Zhang

Tian

Tng³

et al. 2021

Forests

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Litsea Lam. is an ecological and economic important genus of the “core Lauraceae” group in the Lauraceae. The few studies to date on the comparative chloroplast genomics and phylogenomics of Litsea have been conducted as part of other studies on the Lauraceae. Here, we sequenced the whole chloroplast genome sequence of Litsea auriculata, an endangered tree endemic to eastern China, and compared this with previously published chloroplast genome sequences of 11 other Litsea species. The chloroplast genomes of the 12 Litsea species ranged from 152,132 (L. szemaois) to 154,011 bp (L. garrettii) and exhibited a typical quadripartite structure with conserved genome arrangement and content, with length variations in the inverted repeat regions (IRs). No codon usage preferences were detected within the 30 codons used in the chloroplast genomes, indicating a conserved evolution model for the genus. Ten intergenic spacers (psbE–petL, trnH–psbA, petA–psbJ, ndhF–rpl32, ycf4–cemA, rpl32–trnL, ndhG–ndhI, psbC–trnS, trnE–trnT, and psbM–trnD) and five protein coding genes (ndhD, matK, ccsA, ycf1, and ndhF) were identified as divergence hotspot regions and DNA barcodes of Litsea species. In total, 876 chloroplast microsatellites were located within the 12 chloroplast genomes. Phylogenetic analyses conducted using the 51 additional complete chloroplast genomes of “core Lauraceae” species demonstrated that the 12 Litsea species grouped into four sub-clades within the Laurus-Neolitsea clade, and that Litsea is polyphyletic and closely related to the genera Lindera and Laurus. Our phylogeny strongly supported the monophyly of the following three clades (Laurus–Neolitsea, Cinnamomum–Ocotea, and Machilus–Persea) among the above investigated “core Lauraceae” species. Overall, our study highlighted the taxonomic utility of chloroplast genomes in Litsea, and the genetic markers identified here will facilitate future studies on the evolution, conservation, population genetics, and phylogeography of L. auriculata and other Litsea species.

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Section: Introductionmentioning

confidence: 99%

Comparative Chloroplast Genomics of Litsea Lam. (Lauraceae) and Its Phylogenetic Implications

Zhang

Tian

Tng³

et al. 2021

Forests

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“…2018 a ), whereas helical thickenings have been reported in Litseoxylon nanningensis Huang, Jin, Quan & Oskolski and Magnolia nanningensis Huang, Jin, Quan & Oskolski (Huang et al . 2018 b , 2020).…”

Section: Discussionmentioning

confidence: 99%

“…It is noteworthy that the spread of ring‐porosity and semi‐ring‐porosity is nearly in conjunction with the distribution of helical thickenings in Asian trees (Huang et al . 2018 b , 2020).…”

Section: Discussionmentioning

confidence: 99%

Earliest fossil record of the genus Tetradium (Rutaceae) in Asia: implications for its evolution and palaeoecology

Huang

Jin

Quan

et al. 2021

Papers in Palaeontology

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A new species, Tetradium nanningense sp. nov. (Rutaceae), is described on the basis of well-preserved mummified wood from the upper Oligocene Yongning Formation of Nanning Basin, Guangxi Province, South China. This species represents the most ancient fossil evidence of the genus Tetradium in Asia, the region of its modern distribution. Its occurrence in the late Oligocene is consistent with the diversification age of the modern Asian species within this genus as estimated by molecular dating: T. nanningense could be closely related to an ancestor of extant Tetradium species. The fossil record of Tetradium suggests that this genus migrated from North America to eastern Asia in the Oligocene. The presence of (semi-)ring-porous wood and helical thickenings on vessel walls in T. nanningense provides new evidence for the independent gains of these traits in the course of evolution among different plant groups from eastern and south-eastern Asia in the Oligocene. These wood features might have arisen in response to the increase in climate seasonality following the abrupt climate cooling across the Eocene-Oligocene boundary.

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“…Litsea is primarily Asian, but there are a few species in Australia as well as some ranging from North America to subtropical South America (Huang et al, 2008). More recently, Huang et al (2018) created the genus Litseoxylon for an Oligocene Chinese wood they considered to belong to the Litsea complex. Their generic diagnosis specified presence of helical thickenings throughout the vessel elements and occasional scalariform perforation plates; neither feature occurs in the Cherokee Ranch woods.…”

Section: Descriptions Of the Wood Typesmentioning

confidence: 99%

Late Paleocene woods from Cherokee Ranch, Colorado, U.S.A.

Wheeler

Brown

Koch

2019

Rocky Mountain Geology

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Fossil woods are common in the Late Cretaceous through early Eocene rocks of the Denver Basin, Colorado. The overwhelming majority of these woods are dicotyledonous angiosperms. A new locality for fossil woods, Cherokee Ranch, in the upper D1 stratigraphic sequence (Denver Formation) is described, and evidence for it being late Paleocene is reviewed. Most Cherokee Ranch woods resemble previously described Denver Basin angiosperm woods, but there is one new type of wood attributed to the family Lauraceae. A new genus, Ubiquitoxylon, is proposed for woods with the combination of features commonly seen in the Cherokee Ranch woods. Denver Basin Paleocene woods differ from Paleocene wood assemblages to the north (Wyoming and Montana), where conifer woods are common and angiosperms are rare. The width and spacing of the water-conducting vessels and the lack of distinct growth rings in almost all of the Cherokee Ranch woods suggest that these trees did not experience water stress, and there was no pronounced seasonality.

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Litseoxylon gen. nov. (Lauraceae): The most ancient fossil angiosperm wood with helical thickenings from southeastern Asia

Cited by 11 publications

References 51 publications

Comparative Chloroplast Genomics of Litsea Lam. (Lauraceae) and Its Phylogenetic Implications

Comparative Chloroplast Genomics of Litsea Lam. (Lauraceae) and Its Phylogenetic Implications

Earliest fossil record of the genus Tetradium (Rutaceae) in Asia: implications for its evolution and palaeoecology

Late Paleocene woods from Cherokee Ranch, Colorado, U.S.A.

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