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Aspects of sieve element ultrastructure in Primula obconica
Planta, 1966At maturity, the enucleate sieve element of Primula obconica is lined with a parietal layer of cytoplasm consisting of plasmalemma, one or more cisterna-like layers of endoplasmic reticulum, numerous mitochondria and plastids, and a membrane which apparently separates these cytoplasmic components from a large central cavity. The central cavity contains
S R, Tamulevich, R F, Evert
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Soluble and filamentous proteins in Arabidopsis sieve elements
Plant, Cell & Environment, 2012ABSTRACTPhloem sieve elements are highly differentiated cells involved in the long‐distance transport of photoassimilates. These cells contain both aggregated phloem‐proteins (P‐proteins) and soluble proteins, which are also translocated by mass flow. We used liquid chromatography–tandem mass spectrometry (LC‐MS/MS) to carry out a proteomic survey of ...
Batailler, Brigitte +7 more
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American Journal of Botany, 1976
Both intact and cut duckweed plants were prepared for electron microscopy. Plants which are prepared intact do not exhibit callose formation during development of sieve‐plate pores. Future pore sites can be recognized by the presence of median cavities that are unassociated with callose platelets.
Michael A. Walsh, Jerry E. Melaragno
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Both intact and cut duckweed plants were prepared for electron microscopy. Plants which are prepared intact do not exhibit callose formation during development of sieve‐plate pores. Future pore sites can be recognized by the presence of median cavities that are unassociated with callose platelets.
Michael A. Walsh, Jerry E. Melaragno
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Sieve-element plastids ofTriticum andAegilops (Poaceae)
Plant Systematics and Evolution, 1984Fourteen taxa of the Triticum-Aegilops group have been investigated for their sieve-element plastids. At maturity they contain dense and thin crystalloid inclusions and are classified into the PIIc' plastid type; onlyAe. comosa var.biaristata lacked the thin crystalloids and thus conforms to the PII c type.
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Ultrastructure of metaphloem sieve elements inZea mays
Protoplasma, 1975Metaphloem sieve elements from various parts of the plant body ofZea mays L. were examined with the electron microscope. No qualitative differences were found among sieve elements from sources, sinks, and intermediate regions of the plant. At maturity all sieve elements are lined with a parietal layer of cytoplasm, consisting of a plasmalemma, an ...
Michael A. Walsh, Ray F. Evert
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SLIME SUBSTANCE AND STRANDS IN SIEVE ELEMENTS
American Journal of Botany, 1964Studies of the secondary phloem of 6 species of woody dicotyledons revealed that slime is not normally dispersed throughout the vacuole of mature sieve elements, but occurs in the form of discrete strands that traverse the cell and run from cell to cell through the sieve‐plate pores. As many as 5 fine strands, each measuring less than 0.5μ in diameter,
R. F. Evert, W. F. Derr
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Sieve Elements: The Favourite Habitat of Phytoplasmas
2018The sieve elements are the only plant compartments, where phytoplasmas can survive and propagate. Therefore, this chapter is focussed on the specific molecular and cell-biological properties of the sieve element. Sieve element-companion cell complexes arise from (pro)cambial mother cells induced by key genes known to be decisive for sieve-element ...
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Botanica Acta, 1995
AbstractThe sieve‐element characters of 34 species from the Proteaceae and Elaeagnaceae have been studied by transmission electron microscopy. While nondispersive protein bodies and dispersive P‐protein are typical components of both families, specific forms and/or their distinctive origin accentuate some taxa.
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AbstractThe sieve‐element characters of 34 species from the Proteaceae and Elaeagnaceae have been studied by transmission electron microscopy. While nondispersive protein bodies and dispersive P‐protein are typical components of both families, specific forms and/or their distinctive origin accentuate some taxa.
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Microfilaments in pores between frozen-etched sieve elements
Planta, 1968Sieve tubes were frozen before being cut from plants and were prepared for electron microscopy by freeze-etching. Structures that may be interpreted as filaments appeared in and near pores through sieve plates. Their presence suggests that filaments seen in sieve-pores prepared chemically may be there normally.
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Modeling the Hydraulic Conductivity of Phloem Sieve Elements
2019Phloem transport of photoassimilates affects nearly all aspects of plant life, from growth to reproduction. This chapter summarizes mathematical techniques to quantify the impact of sieve element anatomy on phloem transport processes.
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