Topic
Trollius
About: Trollius is a research topic. Over the lifetime, 75 publications have been published within this topic receiving 1181 citations. The topic is also known as: globe flower.
Papers published on a yearly basis
Papers
TL;DR: The epidermal microcharacters of 20 genera in the Ranunculaceae and 10 outgroup genera from the families Glaucidiaceae, Circaeasteraceae, Berberidaceae, Menispermaceae, and Lar- dizabalaceae were studied employing scanning electron and light microscopy to assess phylogeny in the family.
Abstract: The epidermal microcharacters of 20 genera in the Ranunculaceae and 10 outgroup genera from the families Glaucidiaceae, Circaeasteraceae, Berberidaceae, Menispermaceae, and Lar- dizabalaceae were studied employing scanning electron and light microscopy. Characters such as type of trichome and stomatal length are valuable tools in assessing phylogeny in the Ranunculaceae. Using cladistic analyses, the basic division of the family into two major groups according to chro- mosome size (R- and T-types) was confirmed. By outgroup polarization, the T-type chromosome group is considered most primitive. Two major clades are recognized in the T-type taxa: the Aquilegia and Thalictrum group including closely related genera and a group consisting of Coptis and Xan- thorhiza. Hydrastis is not consjdered a member of the Ranunculaceae. Further cladistic analyses of the R-type taxa using macrocharacters derived mainly from floral and fruit morphology resulted in the following subdivisions: the Anemone and Ranunculus group including Pulsatilla, Hepatica, and Clematis; the Cimicifuga and Actaea group; and the Helleborus group including Eranthis, Trollius, and Caltha. The Ranunculaceae, a large and varied fam- ily, consist of approximately 66 genera and 2000 species (Takhtajan 1987). Members of the family are distributed throughout the world, but are centered in the temperate and cold regions of both hemispheres; representatives are uncom- mon in tropical and subtropical zones except in montane regions (Ziman and Keener 1989).
86 citations
TL;DR: It is shown that most species belonging to the same genus have similar chemical compositions, including aliphatic compounds, aromatics, mono- and sesquiterpenoids, and nitrogen-bearing compounds.
Abstract: Anther volatiles of 12 Ranunculaceae species distributed in six genera (Anemone, Aquilegia, Caltha, Pulsatilla, Ranunculus, and Trollius) were investigated by thermal desorption of anthers in quartz microvials inserted into a modified injector. Chemical analysis (GC-MS) yielded a total of 116 compounds from which 103 compounds could be identified. A great diversity of compounds was observed, including aliphatic compounds, aromatics, mono- and sesquiterpenoids, and nitrogen-bearing compounds. Intraspecific variation in the chemical profiles was significantly lower than interspecific variation. Eight compounds explained 96.1% of the observed total variation between the taxa: protoanemonin, octanal, (E,E)-α-farnesene, 2-phenyl ethanol, pentadecane, α-muurolene, phenyl acetaldehyde, and linalool oxide (pyranoid) were either present only in specific taxa or varied greatly in their relative amount between the taxa. An analysis of the scent data using the chord-normalized expected species shared (CNESS) distances of chemical profiles of the species, followed by visualization of the data with nonmetric multidimensional scaling (NMDS) showed that most species belonging to the same genus have similar chemical compositions. The differences in the chemical composition of anther volatiles are discussed with respect to the taxonomy and pollination biology of the species.
84 citations
TL;DR: A strong discrepancy between nucleotide variation and male genitalia morphology variation was found, particularly within and among European species coexisting on a single host plant, suggesting a recent origin of the Chiastocheta genus and several events of diversification, involving both host shifts and within-host-plant radiation.
45 citations
TL;DR: The ability of T. europaeus to extend flower longevity during rainy periods and a long stigmatic receptivity in the absence of pollinators may help to explain the high female reproductive success observed at all elevations.
Abstract: Trollius europaeus (Ranunculaceae) is involved in a mutualistic interaction with several species of Chiastocheta flies (Anthomyiidae) that are both seed predators and pollinators. In the present work, the pollination biology of T. europaeus and its association with Chiastocheta were studied for 3 years in six populations along an elevational gradient in the northern French Alps. We showed that T. europaeus is mainly xenogamous and Chiastocheta represented 90 % of all visitors. We suggest that almost all seed production was achieved by these obligate seed-parasites. Despite high variability in Chiastocheta activity, the pollination service they provided was high and reliable in all populations during this 3-year study and the seed set was not pollen-limited. The ability of T. europaeus to extend flower longevity during rainy periods and a long stigmatic receptivity in the absence of pollinators may help to explain the high female reproductive success observed at all elevations.
45 citations
TL;DR: The pollen of three monotypic genera, Circaeaster, Kingdonia, and Sargentodoxa, has been examined by light and scanning electron microscopy and in the case of the last genus, also by transmission electron microscope.
Abstract: The pollen of three monotypic genera, Circaeaster, Kingdonia, and Sargentodoxa has been examined by light and scanning electron microscopy and in the case of the last genus, also by transmission electron microscopy. The type of tectum found in Circaeaster and Kingdonia, derivations of a compound layer of striae, has a restricted distribution in the Order Ranunculales. Of 64 genera examined in this order only six had species with a similar tectum. They include Achlys, Epimedium, Jeffersonia, and Vancouveria of the Berberidaceae s.l., the controversial Hydrastis, and Trollius of the Ranunculaceae. Circaeaster and Kingdonia have been considered as related since both have rare and primitive vegetative characteristics, the most notable being open dichotomous leaf venation. They are probably best treated as a ditypic family, Circaeasteraceae. The pollen of Sargentodoxa, especially the structure of the exine, closely resembles that of the Lardizabalaceae. However, the fruits of Sargentodoxa have been considered to be distinct from those of the Lardizabalaceae, suggesting that it be treated as a separate, but closely allied, family.
44 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2020 | 4 |
| 2019 | 3 |
| 2018 | 5 |
| 2017 | 1 |
| 2016 | 1 |