Pollen morphology of the genus Skimmia (Rutaceae) and its taxonomic implications

Fukuda, Tomoko; Naiki, Akiyo; Nagamasu, Hidetoshi

doi:10.1007/s10265-008-0174-8

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…Variations in the number and arrangement of apertures have been reported as the most common type of variation within the eudicots (Ressayre et al 2002;Fukuda et al 2008;Golshan et al 2014), which can occur at the population level (polymorphism) or at the individual level (heteromorphism) (Walker and Doyle 1975). In this study, aperture variations were observed to be restricted to the individual level.…”

Section: Number Of Aperturesmentioning

confidence: 66%

Pollen morphology of Indigofera (Fabaceae) in China and its taxonomic implications

Zhao

Gao

2016

Plant Syst Evol

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Asia, especially the temperate Sino-Himalayan region is one of the four major diversity centers of Indigofera. Pollen morphology of Indigofera species in the Sino-Himalayan region is poorly known. In this study, pollen morphology of 52 samples representing 43 Chinese Indigofera species and two varieties was examined using scanning electron microscopy to evaluate its taxonomic significance. Parasyncolpate pollen grains were described in Indigofera for the first time. Cluster and principal component analyses were conducted based on four quantitative and three qualitative pollen characters. Five groups were recognized within Chinese Indigofera in the cluster analysis, but only one can be separated by the first three principal components. The shape and size of pollen grains in Indigofera are highly variable. Consequently, both the characters lack any significant taxonomic value. The number of apertures, tectum architecture and perforation density shows some taxonomic significance. The pollen morphology exhibits obvious phylogenetic and biogeographical significance on large scales in Indigofera. Although pollen characters alone are insufficient to reconstruct the taxonomic relationships within Indigofera, palynological data can provide some useful information for the species-level revisions.

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Section: Number Of Aperturesmentioning

confidence: 66%

Pollen morphology of Indigofera (Fabaceae) in China and its taxonomic implications

Zhao

Gao

2016

Plant Syst Evol

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“…It is widely accepted that the pollen size usually increases with chromosome number. It has been reported that the pollen grains size of the tetraploid species in the genus Skimmia tend to be larger in comparison with other diploid species, though it is not always true (Fukuda et al, 2008). In this study, we also observe that the allotetreaploids (4n = 52) with tetraploid had larger pollen size than the diploid cotton species (2n = 26) with diploid.…”

Section: Discussionsupporting

confidence: 58%

Pollen morphology of the genus Gossypium and its systematic implications

Cai

Hou

Wang

et al. 2022

Preprint

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Background Plants develop a variety of pollen morphological features during long-term evolution, which are controlled by genes and are not easily affected by the external natural environment. Therefore, pollen morphology has great significance in plant taxonomy, evolution and identification. However, there is no detailed study on the pollen morphology of the Gossypium genus although some cotton species have been investigated in the scattered reports. In this study, the pollen morphology of 23 cotton species was comprehensively examined using scanning electron microscopy to evaluate the pollen diversity of the genus and its taxonomic significance. Results The common characteristics of Gossypium pollen are spherical, radially symmetrical, echinate, panporate and operculate. The pollen diameter ranges from 62.43µm in G. harknessii to 103.41µm in G. barbadense, revealing that there are great variations in pollen size among cotton species. Moreover, the exine sculpture is echinate. The exine echini shape is mostly conical or sharply conical and occasionally rodlike. Echini density is found maximum in G. incanum (173) and minimum in G.gossypioides (54), meanwhile, echini length varies from 3.53 µm in G. herbaceum to 9.47 µm in G. barbadense. In addition, all cotton species are divided into three clusters based on cluster analysis, which provides new understanding of the evolution and phylogeny of the Gossypium genus. Conclusion Although the pollen characteristics alone are insufficient to reconstruct taxonomic and systematic relationships within the genus Gossypium, our findings can enrich our knowledge of sporopollen morphology and fill the phenological gap of these taxa and will contribute to future systematic and phylogenetic studies of the Gossypium genus.

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“…A pollen fossil-taxon from California, based on two poorly preserved specimens of 3-colporate, 5-colpate, prolate shaped grains with striate ornamentation, resembles pollen grains of Lycium , Nolana , and Hyoscyamus [51,52]. Similar characters appear in the pollen of the unrelated genera Brucea (Simaroubaceae) and Skimmia (Rutaceae) [51,53], and hence we have not assigned this pollen fossil-taxon to Solanaceae for our analysis (Table 1). …”

Section: Resultsmentioning

confidence: 99%

A phylogenetic framework for evolutionary study of the nightshades (Solanaceae): a dated 1000-tip tree

et al. 2013

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BackgroundThe Solanaceae is a plant family of great economic importance. Despite a wealth of phylogenetic work on individual clades and a deep knowledge of particular cultivated species such as tomato and potato, a robust evolutionary framework with a dated molecular phylogeny for the family is still lacking. Here we investigate molecular divergence times for Solanaceae using a densely-sampled species-level phylogeny. We also review the fossil record of the family to derive robust calibration points, and estimate a chronogram using an uncorrelated relaxed molecular clock.ResultsOur densely-sampled phylogeny shows strong support for all previously identified clades of Solanaceae and strongly supported relationships between the major clades, particularly within Solanum. The Tomato clade is shown to be sister to section Petota, and the Regmandra clade is the first branching member of the Potato clade. The minimum age estimates for major splits within the family provided here correspond well with results from previous studies, indicating splits between tomato & potato around 8 Million years ago (Ma) with a 95% highest posterior density (HPD) 7–10 Ma, Solanum & Capsicum c. 19 Ma (95% HPD 17–21), and Solanum & Nicotiana c. 24 Ma (95% HPD 23–26).ConclusionsOur large time-calibrated phylogeny provides a significant step towards completing a fully sampled species-level phylogeny for Solanaceae, and provides age estimates for the whole family. The chronogram now includes 40% of known species and all but two monotypic genera, and is one of the best sampled angiosperm family phylogenies both in terms of taxon sampling and resolution published thus far. The increased resolution in the chronogram combined with the large increase in species sampling will provide much needed data for the examination of many biological questions using Solanaceae as a model system.

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Pollen morphology of the genus Skimmia (Rutaceae) and its taxonomic implications

Cited by 7 publications

References 23 publications

Pollen morphology of Indigofera (Fabaceae) in China and its taxonomic implications

Pollen morphology of Indigofera (Fabaceae) in China and its taxonomic implications

Pollen morphology of the genus Gossypium and its systematic implications

A phylogenetic framework for evolutionary study of the nightshades (Solanaceae): a dated 1000-tip tree

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