The fine morphology of pollen grains from the pollen chamber of a supposed ginkgoalean seed from the Middle Jurassic of Uzbekistan (Angren locality)

Zavialova, Natalia; Gordenko, N. V.; Nosova, Natalya; Polevova, Svetlana

doi:10.1007/s00606-014-1024-x

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…Earlier, we also studied pollen grains of Cycadopites , found in pollen chambers of dispersed seeds of Allicospermum spp. from the same locality (Zavialova et al ., ,b). The pollen grains are oval in outlines and medium‐sized (approximately 30 × 43

μ

m).…”

Section: Resultsmentioning

confidence: 99%

“…Pollen grains of Cycadopites-type were found in the pollen chamber of a dispersed seed of Allicospermum angrenicum Nosova from the Middle Jurassic locality of Angren in Uzbekistan; pollen treatment, methods and equipments are after Zavialova et al (2014a).…”

Section: Methodsmentioning

confidence: 99%

“…Because of this reason, no data on the fine morphology have been so far available about pollen grains from sporangia of fossil ginkgoaleans. Our study of ginkgoalean pollen grains found in seeds (Zavialova et al ., ,b) is the only report about the inner structure of pollen grains of fossil ginkgoaleans. On the one hand, the material at hand was very valuable; on the other hand, the few pollen grains, inseparable from the cuticle, were not very suitable for a destructive electron‐microscopical study.…”

Section: Introductionmentioning

confidence: 99%

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Potential of CLSM in studying some modern and fossil palynological objects

Гаврилова

Zavialova

Tekleva

et al. 2017

Journal of Microscopy

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We have tested possibilities and limitations of confocal laser scanning microscopy to study the morphology of pollen and spores and inner structure of sporoderms. As test objects, we used pollen grains of the modern angiosperm Ribes niveum (Grossulariaceae) and Datura metel (Solanaceae), fossil angiosperm pollen grains of Pseudointegricorpus clarireticulatum and Wodehouseia spinata dated to the Late Cretaceous, fossil gymnosperm pollen grains of Cycadopites-type dated to the Middle Jurassic, and fossil megaspores Maexisporites rugulaeferus, M. grosstriletus, and Trileites sp. dated to the Early Triassic. For comparative purpose, we studied the same objects with application of conventional light, scanning electron (to entire pollen grains and spores or to semithin sections of their walls), or transmission electron microscopy. The resolution of confocal microscope is much lower than that of electron microscopes, as are its abilities to reconstruct the surface patterns and inner structure. On the other hand, it can provide information that is unreachable by other microscopical methods. Thus, the structure of endoapertures in angiosperm pollen grains can be directly observed. It is also helpful in studies of asymmetrical pollen and pollen grains bearing various appendages and having complicated exine structure, because rotation of 3-D reconstructions allows one to examine all sides and structures of the pollen grain. The exact location of all visible and concealed structures in the sporoderm can be detected; this information helps to describe the morphology and inner structure of pollen grains and to choose necessary directions of further ultrathin sectioning for a transmission electron microscopical study. In studies of fossil pollen grains that are preserved in clumps and stuck to cuticles, confocal microscope is useful in determining the number of apertures in individual pollen grains. This can be done by means of virtual sections through 3-D reconstructions of pollen grains. Fossil megaspores are too large and too thick-walled objects for a confocal study; however, confocal microscope was able to reveal a degree of compression of fossil megaspores, the presence of a cavity between the outer and inner sporoderm layers, and to get some information about sporoderm inner structure.

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μ

m).…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Potential of CLSM in studying some modern and fossil palynological objects

Гаврилова

Zavialova

Tekleva

et al. 2017

Journal of Microscopy

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show abstract

“…Because of the confusing nomenclature systems and the lack of a regulation about which name is the valid one, users should use the genus name with detailed descriptions and certain affinities when different names are available for the same sporomorph taxon. For example, Cycadopites Wodehouse 1933 ex Wilson et Webster 1946 , has such a broad definition that it includes genera such as Cycadaceaelagenella Malyavkina 1953 (Cycadales) and Ginkgocycadophytus Samoilovich 1953 (Ginkgoales) [ 38 , 72 , 96 ]. In this case, Cycadaceaelagenella and Ginkgocycadophytus are advisable to be used rather than Cycadopites .…”

Section: Discussionmentioning

confidence: 99%

Database-based Eco-Plant analysis for Mesozoic dispersed sporomorphs

et al. 2021

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Patterns of community assemblage for plants are associated with particular climatic elements such as water, heat, light, and air. The classification based on these plant assemblages is referred to here as the ecogroup of plants (Eco-Plant), whereas the method of analysing palaeoenvironmental and palaeoclimate variation by using Eco-Plant is called the Eco-Plant model. The online database Sporopollen was created to quickly assign eco-climatic traits to quantitative fossil sporomorph data to assess implications for past vegetation patterns and climatic changes. A user-friendly interface has been created, where users can upload their data to the database and in return get immediate results. This database can automatically link all Mesozoic and Cenozoic sporomorphs to their putative parent plants at phylum, order, or family level. It can also automatically link all Triassic and Jurassic sporomorphs to Eco-Plant groups to assess the effect of humidity (EPH) and the effect of temperature (EPT). The Eco-Plant model allows to reconstruction of relative Triassic and Jurassic humidity and temperature changes. A useful tool for palaeoenvironmental reconstruction. A useful tool for (high-resolution) palynological studies.

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“…The tectum in pollen grains of the studied species and in those described in the literature has a perforated surface. Sahashi and Ueno (1986), Tekleva et al (2007) and Zavialova et al (2011Zavialova et al ( , 2014 published photos of pollen grains very similar to Sansevieria with swollen apertural areas and the apertural area with a rim in Ginkgo biloba and Cycas revoluta.…”

Section: Discussionmentioning

confidence: 99%

Pollen Morphology of Some Species of the Genus Sansevieria Petagna (Asparagaceae)

Klimko¹,

Nowińska²,

Wilkin³

et al. 2017

Acta Biologica Cracoviensia S. Botanica

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Pollen grains of 15 species of the genus Sansevieria were examined using light and scanning electron microscopy. The pollen grains were single, but dyads were also found. The basic shape of the pollen grains (with chemical treatment) was subprolate, prolate and prolate-spheroidal and the pollen grains were large (> 50 mm). The pollen grains observed in SEM were prolate-spheroidal, subprolate, prolate and perprolate. The aperture occupied nearly the entire distal hemisphere. The surface of non-apertural areas was microreticulate, psilate-perforate, fossulate and verrucate. The surface of the apertural area was psilate-perforate-verrucate, microreticulate-verrucategemmate and psilate-perforate. The tectum was homogeneous, with perforations. Our results suggest that some species cannot be separated based on pollen grain morphology, but only may be categorized into their groups. The present study investigated pollen grain morphology in eleven species for the first time in terms of pollen micromorphology and provided some important new data.

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The fine morphology of pollen grains from the pollen chamber of a supposed ginkgoalean seed from the Middle Jurassic of Uzbekistan (Angren locality)

Cited by 15 publications

References 20 publications

Potential of CLSM in studying some modern and fossil palynological objects

Potential of CLSM in studying some modern and fossil palynological objects

Database-based Eco-Plant analysis for Mesozoic dispersed sporomorphs

Pollen Morphology of Some Species of the Genus Sansevieria Petagna (Asparagaceae)

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