Feulgen-positive staining of the cell nuclei in fossilized leaf and fruit tissues of the Lower Eocene Myrtaceae

Ozerov, Igor A.; Zhinkina, N. A.; Efimov, Alexander M.; Мачс, Э. М.; Rodionov, A. V.

doi:10.1111/j.1095-8339.2006.00471.x

Cited by 25 publications

(23 citation statements)

References 37 publications

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“…The identification of nuclei within the Weng'an Biota, along Z. Yin et al Precambrian Research 301 (2017) 145-151 with plausible reports from Phanerozoic deposits (Bomfleur et al, 2012(Bomfleur et al, , 2014Matzke-Karasz et al, 2014;Ozerov et al, 2006), indicates that nuclei can be preserved in the fossil record, contrary to general expectation. Their preservation as external molds, in some instances in association with probable nucleoli, suggests that the nucleus was less susceptible to mineral replication than the surrounding cytoplasm.…”

Section: Discussionmentioning

confidence: 45%

Nuclei and nucleoli in embryo-like fossils from the Ediacaran Weng’an Biota

Yin

Cunningham

Vargas

et al. 2017

Precambrian Research

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms A R T I C L E I N F OKeywords: Fossil embryo Doushantuo Animal Evolution Ediacaran A B S T R A C TThe embryo-like microfossils from the Ediacaran Weng'an Biota (ca. 609 million years old) are among the oldest plausible claims of animals in the fossil record. Fossilization frequently extends beyond the cellular, to preserve subcellular structures including contentious Large Intracellular Structures (LISs) that have been alternately interpreted as eukaryote nuclei or organelles, degraded remains, or abiological structures. Here we present new data on the structure, morphology, and development of the LISs in these embryo-like fossils, based on Synchrotron Radiation X-ray Tomographic Microscopy (SRXTM) and quantitative computed tomographic analysis. All the lines of evidence, including consistency in the number, shape, position, and relative size (LIS-tocytoplasm ratio) of the LISs, as well as their occurrence within preserved cytoplasm, support their interpretation as cell nuclei. Our results allow us to reject the view that nuclei cannot be preserved in early eukaryote fossils, offering new potential for interpreting the fossil record of early eukaryote evolution.

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Section: Discussionmentioning

confidence: 45%

Nuclei and nucleoli in embryo-like fossils from the Ediacaran Weng’an Biota

Yin

Cunningham

Vargas

et al. 2017

Precambrian Research

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“…For histological analysis, sections prepared as described above were stained for 30 s with 0.2% (w/v) toluidine blue (Belami Fine Chemicals [Mumbai, India]) in 0.1 M phosphate buffer, after which the stain was removed, or with a doublestaining technique (with Ehrlich's hematoxylin and alcian blue (BioVitrum [Saint Petersburg, Russia]), as described by Ozerov et al (2006) …”

Section: Methodsmentioning

confidence: 99%

Changes in distribution of zeatin and indole-3-acetic acid in cells during callus induction and organogenesis in vitro in immature embryo culture of wheat

Seldimirova

Kudoyarova

Круглова

et al. 2016

In Vitro Cell.Dev.Biol.-Plant

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Plant organogenesis remains one of the most essential questions of plant developmental biology. Callus tissue in vitro is a valuable tool for the studies on hormonal aspects of plant organogenesis, especially its early events, and immunohistochemical analysis is one of the few approaches offering information on the localization and role of hormones during organ development. The localization of endogenous zeatin and indole-3-acetic acid was investigated during simultaneous bud and root formation in calluses derived from immature embryos of wheat (Triticum aestivum L.). Calluses were induced on Murashige and Skoog (MS) medium supplemented with 2.0 mg L −1 2,4-dichlorophenoxyacetic acid. To stimulate simultaneous bud and root formation, calluses were transferred onto MS medium supplemented with 0.2 mg L −1 kinetin and 0.2 mg L −1 indoleacetic acid. Strong immunostaining for both hormones was detected in proliferating callus tissue, in developing meristematic centers and meristematic zones (whose cells were shown to be involved in organ formation), and at the sites of shoot and root apex initiation. During further development, shoot apexes with leaf primordia were heavily immunostained for zeatin, while immunostaining for indole-3-acetic acid was more intense at the sites of leaf primordia initiation and incipient primordia themselves. In the developing roots, immunostaining for both hormones reached a maximum in the root apex and gradually declined with increasing distance from the apex. Cells of developing procambial strands were also strongly stained for both zeatin and indole-3-acetic acid. These data suggest considerable similarity between patterns of hormone distribution in organs in vitro and in vivo. Thus, callus culture is a convenient and useful model for the study of fundamental biological questions such as how hormones regulate development.

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“…), both deciduous broadleaved trees (Trochodendroides, Platanaceae, Ulmaceae, etc.) and thermophilic southern migrants, such as Myrtaceae and Liquidambar represented by leaves and reproductive organs (Ozerov et al 2006), leaves of Magnolia, Palmae (pollen), Loranthaceae (pollen), and Hamamelidaceae (Kulkova 1973).…”

Section: Later Paleocene and Eocene Floras In The Western Pacific Marginmentioning

confidence: 99%

Paleocene and Eocene floristic and climatic change in Russia and Northern Kazakhstan

Akhmetiev¹

2010

Bull. Geosci.

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Paleocene and Eocene floras of Russia and adjacent regions are reviewed with an interpretation of climatic conditions under which they developed. Floristic and climatic changes in western and central regions of Russia in the Paleocene and in the first part of the Eocene were caused by the dynamics and rearrangement of the systems of marine seaways: a longitudinal seaway, which connected the Arctic basin with the marginal seas of Northern Peri-Tethys (Turanian, South Russian and others), and a latitudinal seaway, which connected the marginal seas of Northern Peri-Tethys with the Atlantic Ocean. As these systems were progressively reduced, the climate in the middle latitudes changed from paratropical (like in West and Central Europe) to a subtropical monsoon climate with wet summers (Late Ypresian to Lutetian), and later to a climate with wet winters (Late Lutetian to the first part of the Priabonian). Floristic changes reflect these climatic trends. In the Paleogene, cold currents constantly influenced the climate of regions of the northwestern Pacific and facilitated development of a warm-temperate mesophilic flora. A warmer episode took place in the Early Eocene. At this time thermophilic plants (Sabal, Myrtaceae and Lauraceae) reached Koryakia, North Western Kamchatka, probably as a result of northward migration. Some subtropical plants existed near the Recent Polar circle. The subtropical Raichikha-type Flora lost temperate elements and, by ecological and climatic types, it is more similar to the Recent flora of South-West and South China.

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Feulgen-positive staining of the cell nuclei in fossilized leaf and fruit tissues of the Lower Eocene Myrtaceae

Cited by 25 publications

References 37 publications

Nuclei and nucleoli in embryo-like fossils from the Ediacaran Weng’an Biota

Nuclei and nucleoli in embryo-like fossils from the Ediacaran Weng’an Biota

Changes in distribution of zeatin and indole-3-acetic acid in cells during callus induction and organogenesis in vitro in immature embryo culture of wheat

Paleocene and Eocene floristic and climatic change in Russia and Northern Kazakhstan

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