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Coiro M, Martínez LCA, Upchurch GR, Doyle JA. Evidence for an extinct lineage of angiosperms from the Early Cretaceous of Patagonia and implications for the early radiation of flowering plants. THE NEW PHYTOLOGIST 2020; 228:344-360. [PMID: 32400897 DOI: 10.1111/nph.16657] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/05/2020] [Indexed: 06/11/2023]
Abstract
The pinnately lobed Aptian leaf fossil Mesodescolea plicata was originally described as a cycad, but new evidence from cuticle structure suggests that it is an angiosperm. Here we document the morphology and cuticle anatomy of Mesodescolea and explore its significance for early angiosperm evolution. We observed macrofossils and cuticles of Mesodescolea with light, scanning electron and transmission electron microscopy, and used phylogenetic methods to test its relationships among extant angiosperms. Mesodescolea has chloranthoid teeth and tertiary veins forming elongate areoles. Its cuticular morphology and ultrastructure reject cycadalean affinities, whereas its guard cell shape and stomatal ledges are angiospermous. It shares variable stomatal complexes and epidermal oil cells with angiosperm leaves from the lower Potomac Group. Phylogenetic analyses and hypothesis testing support its placement within the basal ANITA grade, most likely in Austrobaileyales, but it diverges markedly in leaf form and venation. Although many Early Cretaceous angiosperms fall within the morphological range of extant taxa, Mesodescolea reveals unexpected early morphological and ecophysiological trends. Its similarity to other Early Cretaceous lobate leaves, many identified previously as eudicots but in some cases pre-dating the appearance of tricolpate pollen, may indicate that Mesodescolea is part of a larger extinct lineage of angiosperms.
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Affiliation(s)
- Mario Coiro
- Department of Systematic and Evolutionary Botany, University of Zurich, Zurich, 8008, Switzerland
| | - Leandro C A Martínez
- Instituto de Botánica Darwinion (ANCEFN - CONICET), Labardén 200, San Isidro, Buenos Aires, Argentina
| | - Garland R Upchurch
- Department of Biology, Texas State University, San Marcos, TX, 78666, USA
| | - James A Doyle
- Department of Evolution and Ecology, University of California Davis, Davis, CA, 95616, USA
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52
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Sokoloff DD, Remizowa MV, El ES, Rudall PJ, Bateman RM. Supposed Jurassic angiosperms lack pentamery, an important angiosperm-specific feature. THE NEW PHYTOLOGIST 2020; 228:420-426. [PMID: 31418869 DOI: 10.1111/nph.15974] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 05/24/2019] [Indexed: 06/10/2023]
Affiliation(s)
- Dmitry D Sokoloff
- Biological Faculty, M.V. Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Margarita V Remizowa
- Biological Faculty, M.V. Lomonosov Moscow State University, Moscow, 119234, Russia
| | - Elena S El
- Biological Faculty, M.V. Lomonosov Moscow State University, Moscow, 119234, Russia
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53
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Budd GE, Mann RP. Survival and selection biases in early animal evolution and a source of systematic overestimation in molecular clocks. Interface Focus 2020; 10:20190110. [PMID: 32637066 PMCID: PMC7333906 DOI: 10.1098/rsfs.2019.0110] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2020] [Indexed: 12/21/2022] Open
Abstract
Important evolutionary events such as the Cambrian Explosion have inspired many attempts at explanation: why do they happen when they do? What shapes them, and why do they eventually come to an end? However, much less attention has been paid to the idea of a 'null hypothesis'-that certain features of such diversifications arise simply through their statistical structure. Such statistical features also appear to influence our perception of the timing of these events. Here, we show in particular that study of unusually large clades leads to systematic overestimates of clade ages from some types of molecular clocks, and that the size of this effect may be enough to account for the puzzling mismatches seen between these molecular clocks and the fossil record. Our analysis of the fossil record of the late Ediacaran to Cambrian suggests that it is likely to be recording a true evolutionary radiation of the bilaterians at this time, and that explanations involving various sorts of cryptic origins for the bilaterians do not seem to be necessary.
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Affiliation(s)
- Graham E. Budd
- Department of Earth Sciences, Palaeobiology, Uppsala University, Villavägen 16, Uppsala 752 36, Sweden
| | - Richard P. Mann
- Department of Statistics, School of Mathematics, University of Leeds, Leeds LS2 9JT, UK
- The Alan Turing Institute, London NW1 2DB, UK
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54
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Affiliation(s)
- Casper J van der Kooi
- Groningen Institute for Evolutionary Life Sciences, University of Groningen, NL-9747AG Groningen, Netherlands.
| | - Jeff Ollerton
- Faculty of Arts, Science and Technology, University of Northampton, Northampton NN1 5PH, UK
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55
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The delayed and geographically heterogeneous diversification of flowering plant families. Nat Ecol Evol 2020; 4:1232-1238. [PMID: 32632260 DOI: 10.1038/s41559-020-1241-3] [Citation(s) in RCA: 79] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 06/03/2020] [Indexed: 11/08/2022]
Abstract
The Early Cretaceous (145-100 million years ago (Ma)) witnessed the rise of flowering plants (angiosperms), which ultimately lead to profound changes in terrestrial plant communities. However, palaeobotanical evidence shows that the transition to widespread angiosperm-dominated biomes was delayed until the Palaeocene (66-56 Ma). Important aspects of the timing and geographical setting of angiosperm diversification during this period, and the groups involved, remain uncertain. Here we address these aspects by constructing and dating a new and complete family-level phylogeny, which we integrate with 16 million geographic occurrence records for angiosperms on a global scale. We show substantial time lags (mean, 37-56 Myr) between the origin of families (stem age) and the diversification leading to extant species (crown ages) across the entire angiosperm tree of life. In turn, our results show that families with the shortest lags are overrepresented in temperate and arid biomes compared with tropical biomes. Our results imply that the diversification and ecological expansion of extant angiosperms was geographically heterogeneous and occurred long after most of their phylogenetic diversity originated during the Cretaceous Terrestrial Revolution.
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56
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El ES, Remizowa MV, Sokoloff DD. Developmental Flower and Rhizome Morphology in Nuphar (Nymphaeales): An Interplay of Chaos and Stability. Front Cell Dev Biol 2020; 8:303. [PMID: 32509775 PMCID: PMC7248231 DOI: 10.3389/fcell.2020.00303] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 04/07/2020] [Indexed: 11/13/2022] Open
Abstract
European species of Nuphar are amongthe most accessible members of the basal angiosperm grade, but detailed studies using scanning electron microscopy are lacking. We provide such data and discuss them in the evolutionary context. Dorsiventral monopodial rhizomes of Nuphar bear foliage leaves and non-axillary reproductive units (RUs) arranged in a Fibonacci spiral. The direction of the phyllotaxis spiral is established in seedlings apparently environmentally and maintained through all rhizome branching events. The RUs can be located on dorsal, ventral or lateral side of the rhizome. There is no seasonality in timing of their initiation. The RUs usually form pairs in positions N and N + 2 along the ontogenetic spiral. New rhizomes appear on lateral sides of the mother rhizome. A lateral rhizome is subtended by a foliage leaf (N) and is accompanied by a RU in the position N + 2. We hypothesize a two-step process of regulation of RU/branch initiation, with the second step possibly involving environmental factors such as gravitropism. Each RU has a short stalk, 1-2 scale-like phyllomes and a long-pedicellate flower. We support a theory that the flower is lateral to the RU axis. The five sepals initiate successively and form two whorls as 3 + 2. The sepal arrangement is not 'intermediate' between whorled and spiral. Mechanisms of phyllotaxis establishment differ between flowers and lateral rhizomes. Petal, stamen and carpel numbers are not precisely fixed. Petals are smaller than sepals and form a whorl. They appear first in the sectors of the outer whorl sepals. The stamen arrangement is whorled to chaotic. The merism of the androecium tends to be the same as in the corolla. Flowers with odd numbers of stamen orthostichies are found. These are interpreted as having a non-integer merism of the androecium (e.g., 14.5). Carpels form a whorl in N. lutea and normally alternate with inner whorl stamens. Sterile second whorl carpel(s) are found in some flowers of N. pumila.
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Affiliation(s)
- Elena S. El
- Department of Higher Plants, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Margarita V. Remizowa
- Department of Higher Plants, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia
- Faculty of Biology and Biotechnologies, National Research University Higher School of Economics, Moscow, Russia
| | - Dmitry D. Sokoloff
- Department of Higher Plants, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia
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57
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Stull GW, Soltis PS, Soltis DE, Gitzendanner MA, Smith SA. Nuclear phylogenomic analyses of asterids conflict with plastome trees and support novel relationships among major lineages. AMERICAN JOURNAL OF BOTANY 2020; 107:790-805. [PMID: 32406108 DOI: 10.1002/ajb2.1468] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Accepted: 02/26/2020] [Indexed: 05/14/2023]
Abstract
PREMISE Discordance between nuclear and organellar phylogenies (cytonuclear discordance) is a well-documented phenomenon at shallow evolutionary levels but has been poorly investigated at deep levels of plant phylogeny. Determining the extent of cytonuclear discordance across major plant lineages is essential not only for elucidating evolutionary processes, but also for evaluating the currently used framework of plant phylogeny, which is largely based on the plastid genome. METHODS We present a phylogenomic examination of a major angiosperm clade (Asteridae) based on sequence data from the nuclear, plastid, and mitochondrial genomes as a means of evaluating currently accepted relationships inferred from the plastome and exploring potential sources of genomic conflict in this group. RESULTS We recovered at least five instances of well-supported cytonuclear discordance concerning the placements of major asterid lineages (i.e., Ericales, Oncothecaceae, Aquifoliales, Cassinopsis, and Icacinaceae). We attribute this conflict to a combination of incomplete lineage sorting and hybridization, the latter supported in part by previously inferred whole-genome duplications. CONCLUSIONS Our results challenge several long-standing hypotheses of asterid relationships and have implications for morphological character evolution and for the importance of ancient whole-genome duplications in early asterid evolution. These findings also highlight the value of reevaluating broad-scale angiosperm and green-plant phylogeny with nuclear genomic data.
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Affiliation(s)
- Gregory W Stull
- Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan, 650204, China
- Department of Botany, Smithsonian Institution, Washington, D.C., 20013, USA
| | - Pamela S Soltis
- Florida Museum of Natural History, University of Florida, Gainesville, Florida, 32611, USA
- Biodiversity Institute, University of Florida, Gainesville, Florida, 32611, USA
| | - Douglas E Soltis
- Florida Museum of Natural History, University of Florida, Gainesville, Florida, 32611, USA
- Biodiversity Institute, University of Florida, Gainesville, Florida, 32611, USA
- Department of Biology, University of Florida, Gainesville, Florida, 32611, USA
| | | | - Stephen A Smith
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, 48109, USA
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58
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Budd GE, Mann RP. The dynamics of stem and crown groups. SCIENCE ADVANCES 2020; 6:eaaz1626. [PMID: 32128421 PMCID: PMC7030935 DOI: 10.1126/sciadv.aaz1626] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Accepted: 12/03/2019] [Indexed: 05/22/2023]
Abstract
The fossil record of the origins of major groups such as animals and birds has generated considerable controversy, especially when it conflicts with timings based on molecular clock estimates. Here, we model the diversity of "stem" (basal) and "crown" (modern) members of groups using a "birth-death model," the results of which qualitatively match many large-scale patterns seen in the fossil record. Typically, the stem group diversifies rapidly until the crown group emerges, at which point its diversity collapses, followed shortly by its extinction. Mass extinctions can disturb this pattern and create long stem groups such as the dinosaurs. Crown groups are unlikely to emerge either cryptically or just before mass extinctions, in contradiction to popular hypotheses such as the "phylogenetic fuse". The patterns revealed provide an essential context for framing ecological and evolutionary explanations for how major groups originate, and strengthen our confidence in the reliability of the fossil record.
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Affiliation(s)
- Graham E. Budd
- Department of Earth Sciences, Palaeobiology Programme, Uppsala University, Uppsala, Sweden
- Corresponding author.
| | - Richard P. Mann
- Department of Statistics, School of Mathematics, University of Leeds, Leeds, UK
- The Alan Turing Institute, London, UK
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59
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Zhang L, Chen F, Zhang X, Li Z, Zhao Y, Lohaus R, Chang X, Dong W, Ho SYW, Liu X, Song A, Chen J, Guo W, Wang Z, Zhuang Y, Wang H, Chen X, Hu J, Liu Y, Qin Y, Wang K, Dong S, Liu Y, Zhang S, Yu X, Wu Q, Wang L, Yan X, Jiao Y, Kong H, Zhou X, Yu C, Chen Y, Li F, Wang J, Chen W, Chen X, Jia Q, Zhang C, Jiang Y, Zhang W, Liu G, Fu J, Chen F, Ma H, Van de Peer Y, Tang H. The water lily genome and the early evolution of flowering plants. Nature 2020; 577:79-84. [PMID: 31853069 PMCID: PMC7015852 DOI: 10.1038/s41586-019-1852-5] [Citation(s) in RCA: 199] [Impact Index Per Article: 49.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 10/31/2019] [Indexed: 12/16/2022]
Abstract
Water lilies belong to the angiosperm order Nymphaeales. Amborellales, Nymphaeales and Austrobaileyales together form the so-called ANA-grade of angiosperms, which are extant representatives of lineages that diverged the earliest from the lineage leading to the extant mesangiosperms1-3. Here we report the 409-megabase genome sequence of the blue-petal water lily (Nymphaea colorata). Our phylogenomic analyses support Amborellales and Nymphaeales as successive sister lineages to all other extant angiosperms. The N. colorata genome and 19 other water lily transcriptomes reveal a Nymphaealean whole-genome duplication event, which is shared by Nymphaeaceae and possibly Cabombaceae. Among the genes retained from this whole-genome duplication are homologues of genes that regulate flowering transition and flower development. The broad expression of homologues of floral ABCE genes in N. colorata might support a similarly broadly active ancestral ABCE model of floral organ determination in early angiosperms. Water lilies have evolved attractive floral scents and colours, which are features shared with mesangiosperms, and we identified their putative biosynthetic genes in N. colorata. The chemical compounds and biosynthetic genes behind floral scents suggest that they have evolved in parallel to those in mesangiosperms. Because of its unique phylogenetic position, the N. colorata genome sheds light on the early evolution of angiosperms.
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Affiliation(s)
- Liangsheng Zhang
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Fei Chen
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China ,0000 0000 9750 7019grid.27871.3bCollege of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Xingtan Zhang
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhen Li
- 0000 0001 2069 7798grid.5342.0Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium ,0000000104788040grid.11486.3aVIB Center for Plant Systems Biology, Ghent, Belgium
| | - Yiyong Zhao
- 0000 0001 0125 2443grid.8547.eState Key Laboratory of Genetic Engineering, Ministry of Education Key Laboratory of Biodiversity Sciences and Ecological Engineering, School of Life Sciences, Fudan University, Shanghai, China ,0000 0001 2097 4281grid.29857.31Department of Biology, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA USA
| | - Rolf Lohaus
- 0000 0001 2069 7798grid.5342.0Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium ,0000000104788040grid.11486.3aVIB Center for Plant Systems Biology, Ghent, Belgium
| | - Xiaojun Chang
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China ,Fairy Lake Botanical Garden, Shenzhen and Chinese Academy of Sciences, Shenzhen, China
| | - Wei Dong
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Simon Y. W. Ho
- 0000 0004 1936 834Xgrid.1013.3School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales Australia
| | - Xing Liu
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Aixia Song
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Junhao Chen
- 0000 0000 9152 7385grid.443483.cState Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
| | - Wenlei Guo
- 0000 0000 9152 7385grid.443483.cState Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
| | - Zhengjia Wang
- 0000 0000 9152 7385grid.443483.cState Key Laboratory of Subtropical Silviculture, School of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou, China
| | - Yingyu Zhuang
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Haifeng Wang
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xuequn Chen
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Juan Hu
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yanhui Liu
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuan Qin
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Kai Wang
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shanshan Dong
- Fairy Lake Botanical Garden, Shenzhen and Chinese Academy of Sciences, Shenzhen, China
| | - Yang Liu
- Fairy Lake Botanical Garden, Shenzhen and Chinese Academy of Sciences, Shenzhen, China ,0000 0001 2034 1839grid.21155.32BGI-Shenzhen, Shenzhen, China
| | - Shouzhou Zhang
- Fairy Lake Botanical Garden, Shenzhen and Chinese Academy of Sciences, Shenzhen, China
| | - Xianxian Yu
- 0000 0000 8989 0732grid.412992.5School of Urban-Rural Planning and Landscape Architecture, Xuchang University, Xuchang, China
| | - Qian Wu
- 0000000119573309grid.9227.eKey Laboratory of Plant Resources/Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Beijing, China ,0000 0004 1797 8419grid.410726.6University of the Chinese Academy of Sciences, Beijing, China
| | - Liangsheng Wang
- 0000000119573309grid.9227.eKey Laboratory of Plant Resources/Beijing Botanical Garden, Institute of Botany, Chinese Academy of Sciences, Beijing, China ,0000 0004 1797 8419grid.410726.6University of the Chinese Academy of Sciences, Beijing, China
| | - Xueqing Yan
- 0000 0004 1797 8419grid.410726.6University of the Chinese Academy of Sciences, Beijing, China ,0000000119573309grid.9227.eState Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Yuannian Jiao
- 0000 0004 1797 8419grid.410726.6University of the Chinese Academy of Sciences, Beijing, China ,0000000119573309grid.9227.eState Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Hongzhi Kong
- 0000 0004 1797 8419grid.410726.6University of the Chinese Academy of Sciences, Beijing, China ,0000000119573309grid.9227.eState Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Xiaofan Zhou
- 0000 0000 9546 5767grid.20561.30Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
| | - Cuiwei Yu
- Hangzhou Tianjing Aquatic Botanical Garden, Zhejiang Humanities Landscape Co. Ltd., Hangzhou, China
| | - Yuchu Chen
- Hangzhou Tianjing Aquatic Botanical Garden, Zhejiang Humanities Landscape Co. Ltd., Hangzhou, China
| | - Fan Li
- 0000 0004 1799 1111grid.410732.3National Engineering Research Center for Ornamental Horticulture, Key Laboratory for Flower Breeding of Yunnan Province, Floriculture Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, China
| | - Jihua Wang
- 0000 0004 1799 1111grid.410732.3National Engineering Research Center for Ornamental Horticulture, Key Laboratory for Flower Breeding of Yunnan Province, Floriculture Research Institute, Yunnan Academy of Agricultural Sciences, Kunming, China
| | - Wei Chen
- 0000 0001 0376 205Xgrid.411304.3Innovative Institute of Chinese Medicine and Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Xinlu Chen
- 0000 0001 2315 1184grid.411461.7Department of Plant Sciences, University of Tennessee, Knoxville, TN USA
| | - Qidong Jia
- 0000 0001 2315 1184grid.411461.7Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN USA
| | - Chi Zhang
- 0000 0001 2315 1184grid.411461.7Department of Plant Sciences, University of Tennessee, Knoxville, TN USA
| | - Yifan Jiang
- 0000 0000 9750 7019grid.27871.3bCollege of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Wanbo Zhang
- 0000 0000 9750 7019grid.27871.3bCollege of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - Guanhua Liu
- 0000 0001 0526 1937grid.410727.7Key Laboratory of Tea Quality and Safety Control, Ministry of Agriculture and Rural Affairs, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
| | - Jianyu Fu
- 0000 0001 0526 1937grid.410727.7Key Laboratory of Tea Quality and Safety Control, Ministry of Agriculture and Rural Affairs, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
| | - Feng Chen
- 0000 0000 9750 7019grid.27871.3bCollege of Horticulture, Nanjing Agricultural University, Nanjing, China ,0000 0001 2315 1184grid.411461.7Department of Plant Sciences, University of Tennessee, Knoxville, TN USA ,0000 0001 2315 1184grid.411461.7Graduate School of Genome Science and Technology, University of Tennessee, Knoxville, TN USA
| | - Hong Ma
- 0000 0001 2097 4281grid.29857.31Department of Biology, Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, PA USA
| | - Yves Van de Peer
- 0000 0001 2069 7798grid.5342.0Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium ,0000000104788040grid.11486.3aVIB Center for Plant Systems Biology, Ghent, Belgium ,0000 0001 2107 2298grid.49697.35Centre for Microbial Ecology and Genomics, Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - Haibao Tang
- 0000 0004 1760 2876grid.256111.0Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Key Laboratory of Ministry of Education for Genetics, Breeding and Multiple Utilization of Crops, Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization, Fujian Agriculture and Forestry University, Fuzhou, China
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60
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Bateman RM. Hunting the Snark: the flawed search for mythical Jurassic angiosperms. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:22-35. [PMID: 31538196 DOI: 10.1093/jxb/erz411] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 09/03/2019] [Indexed: 06/10/2023]
Abstract
Several recent palaeobotanical studies claim to have found and described pre-Cretaceous angiosperm macrofossils. With rare exceptions, these papers fail to define a flower, do not acknowledge that fossils require character-based rather than group-based classification, do not explicitly state which morphological features would unambiguously identify a fossil as angiospermous, ignore the modern conceptual framework of phylogeny reconstruction, and infer features in the fossils in question that are interpreted differently by (or even invisible to) other researchers. This unfortunate situation is compounded by the relevant fossils being highly disarticulated two-dimensional compression-impressions lacking anatomical preservation. Given current evidence, all supposed pre-Cretaceous angiosperms are assignable to other major clades among the gymnosperms sensu lato. By any workable morphological definition, flowers are not confined to, and therefore cannot delimit, the angiosperm clade. More precisely defined character states that are potentially diagnostic of angiosperms must by definition originate on the phylogenetic branch that immediately precedes the angiosperm crown group. Although the most reliable candidates for diagnostic characters (triploid endosperm reflecting double fertilization, closed carpel, bitegmic ovule, and phloem companion cells) are rarely preserved and/or difficult to detect unambiguously, similar characters have occasionally been preserved in high-quality permineralized non-angiosperm fossils. The angiosperm radiation documented by Early Cretaceous fossils involves only lineages closely similar to extant taxonomic families, lacks obvious morphological gaps, and (as agreed by both the fossil record and molecular phylogenies) was relatively rapid-all features that suggest a primary radiation. It is unlikely that ancestors of the crown group common ancestor would have fulfilled a character-based definition of (and thereby required expansion of the concept of) an angiosperm; they would instead form a new element of the non-angiosperm members of the 'anthophyte' grade, competing with Caytonia to be viewed as morphologically determined sister group for angiosperms. Conclusions drawn from molecular phylogenetics should not be allowed to routinely constrain palaeobotanical inferences; reciprocal illumination between different categories of data offers greater explanatory power than immediately resorting to Grand Syntheses. The Jurassic angiosperm-essentially a product of molecular phylogenetics-may have become the holy grail of palaeobotany but it appears equally mythical.
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Abstract
Insect pollination of flowering plants (angiosperms) is responsible for the majority of the world's flowering plant diversity and is key to the Cretaceous radiation of angiosperms. Although both insects and angiosperms were common by the mid-Cretaceous, direct fossil evidence of insect pollination is lacking. Direct evidence of Cretaceous insect pollination is associated with insect-gymnosperm pollination. Here, we report a specialized beetle-angiosperm pollination mode from mid-Cretaceous Burmese amber (99 mega-annum [Ma]) in which a tumbling flower beetle (Mordellidae), Angimordella burmitina gen. et sp. nov., has many tricolpate pollen grains attached. A. burmitina exhibits several specialized body structures for flower-visiting behavior including its body shape and pollen-feeding mouthparts revealed by X-ray microcomputed tomography (micro-CT). The tricolpate pollen in the amber belongs to the eudicots that comprise the majority of extant angiosperm species. These pollen grains exhibit zoophilous pollination attributes including their ornamentation, size, and clumping characteristics. Tricolpate pollen grains attached to the beetle's hairs are revealed by confocal laser scanning microscopy, which is a powerful tool for investigating pollen in amber. Our findings provide direct evidence of insect pollination of Cretaceous angiosperms, extending the range insect-angiosperm pollination association by at least 50 million years. Our results support the hypothesis that specialized insect pollination modes were present in eudicots 99 million years ago.
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Affiliation(s)
- Tong Bao
- State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 210008 Nanjing, China
- Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 210008 Nanjing, China
- Institut für Geowissenschaften, Universität Bonn, 53115 Bonn, Germany
| | - Bo Wang
- State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 210008 Nanjing, China;
- Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 210008 Nanjing, China
- Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 100101 Beijing, China
| | - Jianguo Li
- State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 210008 Nanjing, China
- Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 210008 Nanjing, China
| | - David Dilcher
- Department of Geology and Atmospheric Science, Indiana University, Bloomington, IN 47405
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Marshall CR. Using the Fossil Record to Evaluate Timetree Timescales. Front Genet 2019; 10:1049. [PMID: 31803226 PMCID: PMC6871265 DOI: 10.3389/fgene.2019.01049] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 09/30/2019] [Indexed: 12/11/2022] Open
Abstract
The fossil and geologic records provide the primary data used to established absolute timescales for timetrees. For the paleontological evaluation of proposed timetree timescales, and for node-based methods for constructing timetrees, the fossil record is used to bracket divergence times. Minimum brackets (minimum ages) can be established robustly using well-dated fossils that can be reliably assigned to lineages based on positive morphological evidence. Maximum brackets are much harder to establish, largely because it is difficult to establish definitive evidence that the absence of a taxon in the fossil record is real and not just due to the incompleteness of the fossil and rock records. Five primary methods have been developed to estimate maximum age brackets, each of which is discussed. The fact that the fossilization potential of a group typically decreases the closer one approaches its time of origin increases the challenge of estimating maximum age brackets. Additional complications arise: 1) because fossil data actually bracket the time of origin of the first relevant fossilizable morphology (apomorphy), not the divergence time itself; 2) due to the phylogenetic uncertainty in the placement of fossils; 3) because of idiosyncratic temporal and geographic gaps in the rock and fossil records; and 4) if the preservation potential of a group changed significantly during its history. In contrast, uncertainties in the absolute ages of fossils are typically relatively unimportant, even though the vast majority of fossil cannot be dated directly. These issues and relevant quantitative methods are reviewed, and their relative magnitudes assessed, which typically correlate with the age of the group, its geographic range, and species richness.
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Affiliation(s)
- Charles R. Marshall
- Department of Integrative Biology, University of California, Berkeley, Berkeley, CA, United States
- University of California Museum of Paleontology, University of California, Berkeley, Berkeley, CA, United States
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63
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Grimaldi DA, Peñalver E, Barrón E, Herhold HW, Engel MS. Direct evidence for eudicot pollen-feeding in a Cretaceous stinging wasp (Angiospermae; Hymenoptera, Aculeata) preserved in Burmese amber. Commun Biol 2019; 2:408. [PMID: 31728419 PMCID: PMC6838090 DOI: 10.1038/s42003-019-0652-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Accepted: 10/07/2019] [Indexed: 11/08/2022] Open
Abstract
Angiosperms and their insect pollinators form a foundational symbiosis, evidence for which from the Cretaceous is mostly indirect, based on fossils of insect taxa that today are anthophilous, and of fossil insects and flowers that have apparent anthophilous and entomophilous specializations, respectively. We present exceptional direct evidence preserved in mid-Cretaceous Burmese amber, 100 mya, for feeding on pollen in the eudicot genus Tricolporoidites by a basal new aculeate wasp, Prosphex anthophilos, gen. et sp. nov., in the lineage that contains the ants, bees, and other stinging wasps. Plume of hundreds of pollen grains wafts from its mouth and an apparent pollen mass was detected by micro-CT in the buccal cavity: clear evidence that the wasp was foraging on the pollen. Eudicots today comprise nearly three-quarters of all angiosperm species. Prosphex feeding on Tricolporoidites supports the hypothesis that relatively small, generalized insect anthophiles were important pollinators of early angiosperms.
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Affiliation(s)
- David A. Grimaldi
- American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192 USA
| | - Enrique Peñalver
- Museo Geominero, Instituto Geológico y Minero de España. Ríos Rosas 23, E-28003 Madrid, Spain
| | - Eduardo Barrón
- Museo Geominero, Instituto Geológico y Minero de España. Ríos Rosas 23, E-28003 Madrid, Spain
| | - Hollister W. Herhold
- American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192 USA
| | - Michael S. Engel
- Division of Entomology, Natural History Museum, and Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas 66045 USA
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Abstract
Two new studies that consider the timing of origin of angiosperms are poles apart in their estimates. However, their partisan molecular and palaeontological perspectives may hold the key to establishing a unified evolutionary timescale for flowering plants.
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Affiliation(s)
- Philip Donoghue
- School of Earth Sciences, University of Bristol, Life Sciences Building, Tyndall Avenue, Bristol BS8 1TQ, UK.
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Li HT, Yi TS, Gao LM, Ma PF, Zhang T, Yang JB, Gitzendanner MA, Fritsch PW, Cai J, Luo Y, Wang H, van der Bank M, Zhang SD, Wang QF, Wang J, Zhang ZR, Fu CN, Yang J, Hollingsworth PM, Chase MW, Soltis DE, Soltis PS, Li DZ. Origin of angiosperms and the puzzle of the Jurassic gap. NATURE PLANTS 2019; 5:461-470. [PMID: 31061536 DOI: 10.1038/s41477-019-0421-0] [Citation(s) in RCA: 355] [Impact Index Per Article: 71.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Accepted: 04/02/2019] [Indexed: 05/19/2023]
Abstract
Angiosperms are by far the most species-rich clade of land plants, but their origin and early evolutionary history remain poorly understood. We reconstructed angiosperm phylogeny based on 80 genes from 2,881 plastid genomes representing 85% of extant families and all orders. With a well-resolved plastid tree and 62 fossil calibrations, we dated the origin of the crown angiosperms to the Upper Triassic, with major angiosperm radiations occurring in the Jurassic and Lower Cretaceous. This estimated crown age is substantially earlier than that of unequivocal angiosperm fossils, and the difference is here termed the 'Jurassic angiosperm gap'. Our time-calibrated plastid phylogenomic tree provides a highly relevant framework for future comparative studies of flowering plant evolution.
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Affiliation(s)
- Hong-Tao Li
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Ting-Shuang Yi
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Lian-Ming Gao
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Peng-Fei Ma
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Ting Zhang
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Jun-Bo Yang
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Matthew A Gitzendanner
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Department of Biology, University of Florida, Gainesville, FL, USA
| | | | - Jie Cai
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Yang Luo
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Hong Wang
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Michelle van der Bank
- Department of Botany & Plant Biotechnology, University of Johannesburg, Johannesburg, South Africa
| | - Shu-Dong Zhang
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Qing-Feng Wang
- Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China
| | - Jian Wang
- Queensland Herbarium, Department of Environment and Science, Brisbane Botanic Gardens, Toowong, Queensland, Australia
| | - Zhi-Rong Zhang
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Chao-Nan Fu
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
| | - Jing Yang
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | | | - Mark W Chase
- Royal Botanic Gardens, Kew, UK
- Department of Environment and Agriculture, Curtin University, Bentley, Western Australia, Australia
| | - Douglas E Soltis
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA
- Department of Biology, University of Florida, Gainesville, FL, USA
- Genetics Institute, University of Florida, Gainesville, FL, USA
- Biodiversity Institute, University of Florida, Gainesville, FL, USA
| | - Pamela S Soltis
- Florida Museum of Natural History, University of Florida, Gainesville, FL, USA.
- Genetics Institute, University of Florida, Gainesville, FL, USA.
- Biodiversity Institute, University of Florida, Gainesville, FL, USA.
| | - De-Zhu Li
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
- CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China.
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