Results 231 to 240 of about 98,754 (272)
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A reevaluation of extruded nucleoli in sieve elements
Journal of Ultrastructure Research, 1970Immature and mature sieve elements of Populus deltoides, Quercus alba, Salix nigra, Tilia americana, and Rhus glabra were examined with light and electron microscopes. Sieve elements of the first four species contain persistent spherical inclusions similar to those heretofore interpreted as extruded nucleoli.
B P, Deshpande, R F, Evert
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1990
The survival of higher plants is highly dependent upon the phloem path linking assimilate sources and sinks. In an individual plant the elongation, capacity and function of this path have to be finely adjusted to internal and environmental conditions.
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The survival of higher plants is highly dependent upon the phloem path linking assimilate sources and sinks. In an individual plant the elongation, capacity and function of this path have to be finely adjusted to internal and environmental conditions.
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1975
Although it is now more than a hundred years since Hartig (1837, 1860) first discovered sieve tubes, and associated solute transport with sieve elements, the structure of functioning sieve elements and the mechanism of phloem transport are still controversial issues.
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Although it is now more than a hundred years since Hartig (1837, 1860) first discovered sieve tubes, and associated solute transport with sieve elements, the structure of functioning sieve elements and the mechanism of phloem transport are still controversial issues.
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Microtubules in differentiating sieve elements of Gossypium hirsutum
Journal of Ultrastructure Research, 1982Changes in distribution, orientation, and abundance of microtubules (MT) in relation to sieve element differentiation in root protophloem and stem and midvein metaphloem of Gossypium hirsutum were studied at the ultrastructural level. Depending on their stage of differentiation the sieve elements were divided into four previously characterized groups ...
J, Thorsch, K, Esau
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1975
Sieve elements typically have non-lignified cellulosic walls similar to those of parenchyma cells. The walls are often thickened and in most instances this thickening is described as “nacreous” thickening or the “nacre” wall. The term “nacre” was introduced because of the refractve properties of this wall and its characteristic lustre when viewed with ...
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Sieve elements typically have non-lignified cellulosic walls similar to those of parenchyma cells. The walls are often thickened and in most instances this thickening is described as “nacreous” thickening or the “nacre” wall. The term “nacre” was introduced because of the refractve properties of this wall and its characteristic lustre when viewed with ...
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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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