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Article ; Online: CLADISTICS OF THE MAGNOLIIDAE.

Loconte, Henry / Stevenson, Dennis W

Cladistics : the international journal of the Willi Hennig Society

2021 Volume 7, Issue 3, Page(s) 267–296

Abstract: A cladistic resolution is presented for the origin of the angiosperms based on a parsimony analysis of 49 taxa of Magnoliidae. Hamamelidae and Alismatidae, with gymnospermous outgroup comparisons for the polarization of 104 characters. The Magnoliidae is ...

Abstract	A cladistic resolution is presented for the origin of the angiosperms based on a parsimony analysis of 49 taxa of Magnoliidae. Hamamelidae and Alismatidae, with gymnospermous outgroup comparisons for the polarization of 104 characters. The Magnoliidae is recognized as a paraphyletic assemblage of nine orders: Calycanthales, Magnoliales, Laurales, Illiciales, Lactoridales. Ranunculales, Aristolochiales, Piperales and Nymphaeales. The Calycanthaceae and Idiospermaceae are segregated as the new order Calycanthales, which is hypothesized to be the archetype for angiosperms. Excluding Winteraceae and Lactoridaceae, the Magnoliales is monophyletic. The Austrobaileyaceae is a first branch of Magnoliales, rather than lauralean. Excluding Amborellaceae and Calycanthales, the Laurales is monophyletic. The Chloranthaceae is a first branch of Laurales, rather than piperalean. The Amborellaceae and Winteraceae are early branches of Illiciales. The Lactoridaceae is isolated as the Lactoridales. Including Papaveraceae, the Ranunculales is monophyletic, with Lardizabalaceae as a first branch. The Ranunculales is more closely related to the Hamamelidae, forming the clade Tricolpates. The Aristolochiales, Piperales and Nymphaeales are successively more closely related to the Alismatidae, forming the clade Paleoherbs. The Nelumbonaceae are nymphaealean Paleoherbs, rather than Tricolpates. The Lactoridaceae is not a Paleoherb. These results support many aspects of the strobilar-flower hypothesis for the origin of the angiosperms, as well as the plesiomorphic character states of woody shrubs with simple, pinnatelyveined leaves.
Language	English
Publishing date	2021-12-21
Publishing country	United States
Document type	Journal Article
ZDB-ID	1462608-1
ISSN	1096-0031 ; 0748-3007
ISSN (online)	1096-0031
ISSN	0748-3007
DOI	10.1111/j.1096-0031.1991.tb00038.x
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Retracing origins of exceptional cycads in botanical collections to increase conservation value

Iwanycki Ahlstrand, Natalie / Stevenson, Dennis W.

Plants, people, planet. 2021 Mar., v. 3, no. 2

2021

Abstract: Cycads have a long history of use in traditional medicine and food, and are among the most highly sought‐after plants in ornamental horticulture. Threatened by overharvesting and habitat destruction, cycads are the most threatened group of plants in the ... ...

Abstract	Cycads have a long history of use in traditional medicine and food, and are among the most highly sought‐after plants in ornamental horticulture. Threatened by overharvesting and habitat destruction, cycads are the most threatened group of plants in the world. Thousands of cycads are on display at botanic gardens worldwide, and many have been kept alive for centuries. Unfortunately, information about their provenance is unknown or has been lost over time. By retracing wild origins (provenance) of cycads in botanical collections, we can realise their untapped value for use in restoration and recovery work, addressing international conservation targets.
Keywords	habitat destruction ; ornamental horticulture ; provenance ; traditional medicine
Language	English
Dates of publication	2021-03
Size	p. 94-98.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ISSN	2572-2611
DOI	10.1002/ppp3.10176
Database	NAL-Catalogue (AGRICOLA)

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Article: Flower and Spikelet Construction in Rapateaceae (Poales).

Koblova, Sofia D / Rudall, Paula J / Sokoloff, Dmitry D / Stevenson, Dennis W / Remizowa, Margarita V

Frontiers in plant science

2022 Volume 12, Page(s) 813915

Abstract: The family Rapateaceae represents an early-divergent lineage of Poales with biotically pollinated showy flowers. We investigate developmental morphology and anatomy in all three subfamilies and five tribes of Rapateaceae to distinguish between ... ...

Abstract	The family Rapateaceae represents an early-divergent lineage of Poales with biotically pollinated showy flowers. We investigate developmental morphology and anatomy in all three subfamilies and five tribes of Rapateaceae to distinguish between contrasting hypotheses on spikelet morphology and to address questions on the presence of nectaries and gynoecium structure. We support an interpretation of the partial inflorescence (commonly termed spikelet), as a uniaxial system composed of a terminal flower and numerous empty phyllomes. A terminal flower in an inflorescence unit is an autapomorphic feature of Rapateaceae. The gynoecium consists of synascidiate, symplicate, and usually asymplicate zones, with gynoecium formation encompassing congenital and often also postgenital fusions between carpels. Species of Rapateaceae differ in the relative lengths of the gynoecial zones, the presence or absence of postgenital fusion between the carpels and placentation in the ascidiate or plicate carpel zones. In contrast with previous reports, septal nectaries are lacking in all species. The bird-pollinated tribe Schoenocephalieae is characterized by congenital syncarpy; it displays an unusual type of gynoecial (non-septal) nectary represented by a secretory epidermis at the gynoecium base.
Language	English
Publishing date	2022-01-27
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2613694-6
ISSN	1664-462X
ISSN	1664-462X
DOI	10.3389/fpls.2021.813915
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Article: Seed anatomy and development in cycads and Ginkgo, keys for understanding the evolution of seeds

Zumajo-Cardona, Cecilia / Frangos, Samantha / Stevenson, Dennis W.

Flora. 2021 Dec., v. 285

2021

Abstract: Cycadales and Ginkgoales constitute two of the most ancient lineages of extant seed plants and as such are prime candidates for the study of the evolution of seeds and the genes involved. The ovules of these plant lineages are formed by a single massive ... ...

Abstract	Cycadales and Ginkgoales constitute two of the most ancient lineages of extant seed plants and as such are prime candidates for the study of the evolution of seeds and the genes involved. The ovules of these plant lineages are formed by a single massive integument that, as the ovule matures into a seed, is comprised of a stony layer covered by a fleshy seed coat. However, literature on their seed morphology and anatomy, which is key for understanding the evolution of land plants, is scarce and not easily accessible. Here we provide a literature review highlighting the diversity of ovule and megastrobilus morphologies. Additionally, we present further morphological and anatomical descriptions, making a comprehensive description of ovulated structures in Cycadales. In general, the integument is similar amongst these species, with three well differentiated zones: sarcotesta, sclerotesta and endotesta, from the outer most zone to the inner most zone. Cycad ovules have two sets of vascular bundles: one in the sarcotesta and another one in the region between the endotesta and the nucellus (i.e., the pachychalaza). However, Ginkgo does not have any vasculature in the ovule. Other differences between species that are mainly related with the number of cell layers and to the abundance and the location of ergastic substances.
Keywords	Cycadales ; Ginkgo ; evolution ; flora ; integument ; nucellus ; seed morphology ; testa
Language	English
Dates of publication	2021-12
Publishing place	Elsevier GmbH
Document type	Article
ZDB-ID	5580-3
ISSN	0367-2530 ; 0373-6490
ISSN	0367-2530 ; 0373-6490
DOI	10.1016/j.flora.2021.151951
Database	NAL-Catalogue (AGRICOLA)

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Article: Cycad-Weevil Pollination Symbiosis Is Characterized by Rapidly Evolving and Highly Specific Plant-Insect Chemical Communication.

Salzman, Shayla / Crook, Damon / Calonje, Michael / Stevenson, Dennis W / Pierce, Naomi E / Hopkins, Robin

Frontiers in plant science

2021 Volume 12, Page(s) 639368

Abstract: Coevolution between plants and insects is thought to be responsible for generating biodiversity. Extensive research has focused largely on antagonistic herbivorous relationships, but mutualistic pollination systems also likely contribute to ... ...

Abstract	Coevolution between plants and insects is thought to be responsible for generating biodiversity. Extensive research has focused largely on antagonistic herbivorous relationships, but mutualistic pollination systems also likely contribute to diversification. Here we describe an example of chemically-mediated mutualistic species interactions affecting trait evolution and lineage diversification. We show that volatile compounds produced by closely related species of
Language	English
Publishing date	2021-04-30
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2711035-7
ISSN	1664-462X
ISSN	1664-462X
DOI	10.3389/fpls.2021.639368
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Article ; Online: Molecular phylogenetics of the Ronnbergia Alliance (Bromeliaceae, Bromelioideae) and insights into their morphological evolution.

Aguirre-Santoro, Julián / Michelangeli, Fabián A / Stevenson, Dennis W

Molecular phylogenetics and evolution

2016 Volume 100, Page(s) 1–20

Abstract: The tank-epiphytic clade of berry-fruited bromeliads, also known as the Core Bromelioideae, represents a remarkable event of adaptive radiation within the Bromeliaceae; however, the details of this radiation have been difficult to study because this ... ...

Abstract	The tank-epiphytic clade of berry-fruited bromeliads, also known as the Core Bromelioideae, represents a remarkable event of adaptive radiation within the Bromeliaceae; however, the details of this radiation have been difficult to study because this lineage is plagued with generic delimitation problems. In this study, we used a phylogenetic approach to investigate a well supported, albeit poorly understood, lineage nested within the Core Bromelioideae, here called the "Ronnbergia Alliance". In order to assess the monophyly and phylogenetic relationships of this group, we used three plastid and three nuclear DNA sequence markers combined with a broad sampling across three taxonomic groups and allied species of Aechmea expected to comprise the Ronnbergia Alliance. We combined the datasets to produce a well-supported and resolved phylogenetic hypothesis. Our main results indicated that the Ronnbergia Alliance was a well-supported monophyletic group, sister to the remaining Core Bromelioideae, and it was composed by species of the polyphyletic genera Aechmea, Hohenbergia and Ronnbergia. We identified two major internal lineages with high geographic structure within the Ronnbergia Alliance. The first of these lineages, called the Pacific Clade, contained species of Aechmea and Ronnbergia that occur exclusively from southern Central America to northwestern South America. The second clade, called the Atlantic Clade, contained species of Aechmea, Hohenbergia and Ronnbergia mostly limited to the Atlantic Forest and the Caribbean. We also explored the diagnostic and evolutionary importance of 13 selected characters using ancestral character reconstructions on the phylogenetic hypothesis. We found that the combination of tubular corollas apically spreading and unappendaged ovules had diagnostic value for the Ronnbergia Alliance, whereas flower size, length of the corolla tube, and petal pigmentation and apex were important characters to differentiate the Pacific and Atlantic clades. This study opens new perspectives for future taxonomic reorganizations and provides a framework for evolutionary and biogeographic studies.
MeSH term(s)	Atlantic Ocean ; Bayes Theorem ; Bromeliaceae/anatomy & histology ; Bromeliaceae/classification ; Bromeliaceae/genetics ; Cell Nucleus/genetics ; DNA, Chloroplast/genetics ; DNA, Plant/genetics ; Databases, Nucleic Acid ; Geography ; Likelihood Functions ; Pacific Ocean ; Phylogeny ; Sequence Analysis, DNA ; Species Specificity
Chemical Substances	DNA, Chloroplast ; DNA, Plant
Language	English
Publishing date	2016-07
Publishing country	United States
Document type	Journal Article
ZDB-ID	33610-5
ISSN	1095-9513 ; 1055-7903
ISSN (online)	1095-9513
ISSN	1055-7903
DOI	10.1016/j.ympev.2016.04.007
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Article: Respiratory temperature responses of tropical conifers differ with leaf morphology

Schmiege, Stephanie C. / Buckley, Brendan M. / Stevenson, Dennis W. / Heskel, Mary A. / Cuong, Truong Quang / Nam, Le Canh / Griffin, Kevin L.

Functional ecology. 2021 July, v. 35, no. 7

2021

Abstract: Photosynthetic traits suggest that shade tolerance may explain the contrasting success of two conifer taxa, Podocarpaceae and Pinaceae, in tropical forests. Needle‐leaved species from Pinus (Pinaceae) are generally absent from tropical forests, whereas ... ...

Abstract	Photosynthetic traits suggest that shade tolerance may explain the contrasting success of two conifer taxa, Podocarpaceae and Pinaceae, in tropical forests. Needle‐leaved species from Pinus (Pinaceae) are generally absent from tropical forests, whereas Pinus krempfii, a flat‐leaved pine, and numerous flat‐leaved Podocarpaceae are abundant. Respiration (R) traits may provide additional insight into the drivers of the contrasting success of needle‐ and flat‐leaved conifers in tropical forests. We measured the short‐term respiratory temperature (RT) response between 10 and 50°C and foliar morphological traits of three needle‐ and seven flat‐leaved conifer species coexisting in a tropical montane forest in the Central Highlands of Vietnam containing notable conifer diversity. We fit a lognormal polynomial model to each RT curve and extracted the following three parameters: a (basal R), and b and c (together describing the shape of the response). Needle‐leaved species (Pinus kesiya, Pinus dalatensis and Dacrydium elatum) had higher rates of area‐based R at 25°C (R₂₅‐ₐᵣₑₐ) as well as higher area‐based modelled basal respiration (a) than flat‐leaved species (P. krempfii, Podocarpus neriifolius, Dacrycarpus imbricatus, Nageia nana, Taxus wallichiana, Keteeleria evelyniana and Fokienia hodginsii). No significant differences were found between needle‐ and flat‐leaved species in mass‐based R₂₅ (R₂₅‐ₘₐₛₛ) or in the shape of the RT response (b and c); however, interspecific differences in R₂₅‐ₘₐₛₛ, R at nighttime temperature extremes (R₄.₁ and R₂₀.₆) and leaf traits were apparent. Differences in R₂₅‐ₐᵣₑₐ and a suggest that needle‐leaved foliage may be more energetically costly to maintain than flat‐leaved foliage, providing new insight and additional support for the hypothesis that shade tolerance is an important driver of Podocarpaceae success and Pinaceae absence in the majority of tropical forests. Interspecific differences in R₂₅‐ₘₐₛₛ and leaf traits highlight that varying ecological strategies are employed by conifers to coexist and survive in the Central Highlands of Vietnam. Ultimately, these data further our understanding of current conifer biogeographical distributions and underscore the need for additional studies to elucidate the effects of extreme temperature events on the continued survival of conifers in this unique forest. A free Plain Language Summary can be found within the Supporting Information of this article.
Keywords	Dacrycarpus imbricatus ; Dacrydium ; Fokienia hodginsii ; Nageia ; Pinus kesiya ; Podocarpus neriifolius ; Taxus wallichiana ; conifers ; geographical distribution ; leaf morphology ; leaves ; mathematical models ; montane forests ; night temperature ; photosynthesis ; shade tolerance ; Vietnam
Language	English
Dates of publication	2021-07
Size	p. 1408-1423.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	2020307-X
ISSN	1365-2435 ; 0269-8463
ISSN (online)	1365-2435
ISSN	0269-8463
DOI	10.1111/1365-2435.13814
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Anatomy of fleshy fruits in the monocots.

Thadeo, Marcela / Hampilos, Katherine E / Stevenson, Dennis W

American journal of botany

2015 Volume 102, Issue 11, Page(s) 1757–1779

Abstract: Premise of the study: An anatomical and developmental study of distantly related fleshy fruits in the monocots was undertaken to better understand the evolution of baccate fruits in the monocot clade as a whole. We studied 14 species with fleshy fruits ... ...

Abstract	Premise of the study: An anatomical and developmental study of distantly related fleshy fruits in the monocots was undertaken to better understand the evolution of baccate fruits in the monocot clade as a whole. We studied 14 species with fleshy fruits spanning the Alismatales, Arecales, Asparagales, Commelinales, Dioscoreales, Liliales, and Poales to determine various mechanisms through which baccate fruits attain fleshiness at maturity. Methods: Flowers and fruits of various stages were collected, sectioned, stained, and examined using light microscopy and scanning electron microscopy. Key results: Three basic pathways for attaining fleshiness were identified within the species examined (true berries, with a uniform pericarp; typical drupes, with an endocarp differentiated by the presence of stony pyrenes; and specialized drupes, involving mesocarp and endocarp differentiated by stone pyrenes). Furthermore, developmental characters differentiating basic fruit types were identified. Conclusions: Fleshy fruits in the monocots do not develop through a single shared pathway, indicating that fleshiness has evolved multiple times within the clade.
MeSH term(s)	Fruit/anatomy & histology ; Fruit/genetics ; Fruit/growth & development ; Magnoliopsida/anatomy & histology ; Magnoliopsida/genetics ; Magnoliopsida/growth & development ; Seeds/anatomy & histology ; Seeds/genetics ; Seeds/growth & development
Language	English
Publishing date	2015-11
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2935-x
ISSN	1537-2197 ; 0002-9122
ISSN (online)	1537-2197
ISSN	0002-9122
DOI	10.3732/ajb.1500204
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Book: Plant anatomy

Cutler, David F. / Botha, Christiaan E. J. / Stevenson, Dennis W.

an applied approach

2008

Author's details	D. F. Cutler ; C. E. J. Botha ; D. W. Stevenson
Keywords	Plant anatomy ; Pflanzenanatomie
Subject	Pflanzen ; Phytotomie
Subject code	571.32
Language	English
Size	VII, 302 S. : Ill., graph. Darst.
Publisher	Blackwell
Publishing place	Malden, Mass. u.a.
Publishing country	United States
Document type	Book
Accompanying material	1 CD-ROM (12 cm)
HBZ-ID	HT014508776
ISBN	1-4051-2679-5 ; 978-1-4051-2679-3
Database	Catalogue ZB MED Nutrition, Environment, Agriculture

In stock of ZB MED Bonn / Germany

Shelf mark	Loan status	Location
088/393	available for loan (reading room)	Freihandmagazin (U1)

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Article: The Plant Ontology Facilitates Comparisons of Plant Development Stages Across Species.

Walls, Ramona L / Cooper, Laurel / Elser, Justin / Gandolfo, Maria Alejandra / Mungall, Christopher J / Smith, Barry / Stevenson, Dennis W / Jaiswal, Pankaj

Frontiers in plant science

2019 Volume 10, Page(s) 631

Abstract: The Plant Ontology (PO) is a community resource consisting of standardized terms, definitions, and logical relations describing plant structures and development stages, augmented by a large database of annotations from genomic and phenomic studies. This ... ...

Abstract	The Plant Ontology (PO) is a community resource consisting of standardized terms, definitions, and logical relations describing plant structures and development stages, augmented by a large database of annotations from genomic and phenomic studies. This paper describes the structure of the ontology and the design principles we used in constructing PO terms for plant development stages. It also provides details of the methodology and rationale behind our revision and expansion of the PO to cover development stages for all plants, particularly the land plants (bryophytes through angiosperms). As a case study to illustrate the general approach, we examine variation in gene expression across embryo development stages in Arabidopsis and maize, demonstrating how the PO can be used to compare patterns of expression across stages and in developmentally different species. Although many genes appear to be active throughout embryo development, we identified a small set of uniquely expressed genes for each stage of embryo development and also between the two species. Evaluating the different sets of genes expressed during embryo development in Arabidopsis or maize may inform future studies of the divergent developmental pathways observed in monocotyledonous versus dicotyledonous species. The PO and its annotation database (http://www.planteome.org) make plant data for any species more discoverable and accessible through common formats, thus providing support for applications in plant pathology, image analysis, and comparative development and evolution.
Language	English
Publishing date	2019-06-04
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2613694-6
ISSN	1664-462X
ISSN	1664-462X
DOI	10.3389/fpls.2019.00631
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