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Jul 4, 2013 · Phloem parenchyma cells in the minor veins of some species (Pate and Gunning, 1969), including Arabidopsis (Haritatos et al., 2000b), differentiate into transfer cells in a non-continuous pattern along the length of the phloem (Chinnappa et al., 2013) with wall ingrowths primarily at the interface with the sieve element–companion cell complex (Figure 5C).
Aug 28, 2012 · One of the most intriguing aspects of the phloem is the connection between living sieve tubes formed from interconnected sieve elements (SEs) and the sieve-tube control system provided by the companion cells (CCs). In angiosperms, the only structures within the lumen of a SE are the phloem-specific proteins. The major component of the remaining ...
- Rosemary G. White
- 2012
Oct 8, 2013 · Relationship between the phloem loading strategy at the minor vein and the ultrastructure of the companion cell(i) When apoplastic loading occurs, sucrose is pumped from the apoplast into the transfer cells (TCs) of the minor vein phloem by transporters (yellow circle), which enables the leaf to minimize the overall sucrose concentration in the leaf blade. Transfer cells (TCs) possess cell ...
- Veerle De Schepper, Tom De Swaef, Ingvar Bauweraerts, Kathy Steppe
- 2013
It includes the following issues: (a) evolution of the sieve elements; (b) the specific structural outfit of sieve elements and its functional significance; (c) modes of cellular and molecular interaction between sieve element and companion cell; (d) plasmodesmal trafficking between sieve element and companion cell as the basis for macromolecular long-distance signalling in the phloem; (e ...
- A. J. E. Van Bel
- 2003
Apr 1, 1999 · Of all the intricate cell–cell interactions in nature, those between the sieve element (SE) and its companion cell (CC) rank among the most complex and mysterious. Mature SEs are enucleate and retain only a highly degenerate cytoplasm, yet they can remain viable and functional for decades (Parthasarathy and Tomlinson, 1967). Generations of ...
- Karl J. Oparka, Robert Turgeon
- 1999
Nov 3, 2016 · Abstract. Vascular plants have developed highly specialized cells to transport nutrients and developmental signals. The differentiation process includes the degradation of multiple organelles of the sieve element cells (SEs) to facilitate transport and, as a consequence, SEs become dependent on neighboring companion cells (CCs).
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Sep 12, 2022 · The vascular bundles of modern-day tracheophytes comprising xylem and phloem with the sieve element/companion cell (SE/CC) complex as the core unit of the phloem. (a) The concentrically arranged vascular bundles in the stem of dicotyledonous plants (here a cross-section of a Vicia faba stem) allow the efficient long-distance transport of water, nutrients and signals throughout the plant body.
