Results 261 to 270 of about 17,918 (286)

SLIME SUBSTANCE AND STRANDS IN SIEVE ELEMENTS

American Journal of Botany, 1964
Studies 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 Element Cell Walls

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‐Element Characters of the Proteaceae and Elaeagnaceae: Nuclear Crystals, Phloem Proteins and Sieve‐Element Plastids

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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The control of solute movement into sieve elements

Pesticide Science, 1972
AbstractA review is given of work on the movement of solutes into sieve elements, particularly with regard to investigations in which sieve tube exudate is obtained via the severed stylets of the aphid Tuberolachnus salignus (Gmelin), sited on bark strips or stem segments of willow.Evidence is given showing that the uptake of naturally occurring ...
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Modeling the Hydraulic Conductivity of Phloem Sieve Elements

2019
Phloem 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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Proteomics of isolated sieve tubes fromNicotiana tabacum: sieve element–specific proteins reveal differentiation of the endomembrane system

Proceedings of the National Academy of Sciences of the United States of America, 2022
Yan Liu, Viktoriya V Vasina, Max Kraner   +2 more
exaly  

Sieve Elements in Haustoria of Parasitic Angiosperms

1990
The necessity for conducting elements within haustoria of phanerogamic parasites is obvious, especially since holoparasitic angiosperms lack roots and assimilatory organs. Water as well as organic substances must be taken up, therefore, by specialized haustoria (Kuijt 1969; Kollmann and Dorr 1987). The faster the parasite grows, the more efficient must
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Sieve Element Structure in Relation to Function

1975
Translocation in the phloem of higher plants represents a complex physiological process with several partial reactions working together. Uptake and release of substances, energy transfer as well as storage of assimilates, are involved; or there may be a requirement in some cases for the mechanism of long-distance transport.
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Sieve Element of Impatiens sultanii

Annals of Botany, 1965
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Regeneration and Differentiation of Sieve Tube Elements

1970
Publisher Summary This chapter discusses regeneration and differentiation of sieve tube elements. The pattern of first differentiation of sieve tubes in the young leaf is continuous and acropetal. The first sieve tube element in the leaf forms at a separate locus on the outer side of the procambial strand near the base of the leaf.
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