sieve tube

noun Botany.
1.
a vertical series of sieve cells in the phloem, specialized for the conduction of food materials.
2.
a single sieve cell.

Origin:
1870–75

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World English Dictionary
sieve tube
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

sieve tube

in flowering plants, elongated living cells (sieve-tube elements) of the phloem, the nuclei of which have fragmented and disappeared and the transverse end walls of which are pierced by sievelike groups of pores (sieve plates). They are the conduits of food (mostly sugar) transport.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Sieve tube development in strawberry receptacles in relation to fruit set and initial growth.
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