Companion cells

Companion cells move sugars and amino acids into and out of the sieve elements.
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Companion cells load sugar into the sieve element (sieve elements are connected into sieve tubes). Fluids can move up or down within the phloem, and are translocated from one place to another. Sources are places where sugars are being produced.
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companion cells
A type of plant cell that is connected to a sieve-tube member, making up the phloem tissue.
Covered in Lab 9 Seed Plant Sporophyte ...
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Phloem tissue consists of less specialised and nucleate parenchyma cells, sieve-tube cells, and companion cells (in addition albuminous cells, fibers and sclereids).
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Phloem tissue consists of sieve-tube members and companion cells . The sieve-tube elements are large, cylindrical cells, with large pores in the cell wall at either end. They are almost entirely dead, and have no organelles.
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phloem. The food-conducting tissue of a plant, made up of sieve tubes, companion cells, phloem parenchyma, and fibers.
phloem-feeding. An organism that withdraws nutrients from the food-conducting tissue of a plant's vascular system.
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