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companion cell

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mass flow

Overview page. Subjects: Biological Sciences.

A hypothesis to explain the movement of sugars in the phloem tissue of plants. At a source (site of production) sugars are loaded into companion cells and thence into the sieve elements...

See overview in Oxford Index

phloem

Overview page. Subjects: Biological Sciences.

The main food‐conducting tissue of plants, via which nutrients and photosynthate are conveyed between different sites. Phloem comprises two types of cells: sieve‐tube elements, which are...

See overview in Oxford Index

sieve element

Overview page. Subjects: Biological Sciences.

A type of plant cell occurring within the phloem. Sieve elements combine to form a series of tubes (sieve tubes) connecting the leaves, shoots, and roots in a fine network. Food materials...

See overview in Oxford Index