sieve tube

noun

Botany.

a vertical series of sieve cells in the phloem, specialized for the conduction of food materials.
a single sieve cell.

sieve tube

noun

botany an element of phloem tissue consisting of a longitudinal row of thin-walled elongated cells with perforations in their connecting walls through which food materials pass

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Word History and Origins

Origin of sieve tube¹

First recorded in 1870–75

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Example Sentences

Examples have not been reviewed.

Annular vessel; 2. spiral vessel; 3. pitted vessel; 4. phloëm or sieve tubes; 5. sclerenchyma.

From

The wood is distinguished by the presence of vessels with close, spiral or ring-shaped thickenings, while in the phloem are found sieve tubes, not unlike those in the ferns.

From

This is the phloëm and it consists of sieve tubes and thin-walled cells.

From

Annular vessel; 2. spiral vessel; 3. pitted vessel; 4. sieve tubes or phloëm; 5. sclerenchyma.

From

The rest of the bundle is made up of nearly uniform, rather thin-walled, colorless cells, some of which, however, are larger, and have perforated cross-walls, representing the sieve tubes of the fern bundle.

From

sievert sieve-tube element

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