sieve-tube defined in 1951 yearsieve-tube - sieve-tube;
sieve-tube - Characteristic element of phloem functioning in the transport of food materials synthesized within the plant, e.g. sugars, proteins. Consists of thin-walled, elongated, living cells arranged in a longitudinal row and forming a connected series by means of perforations in their walls through which pass strands of cytoplasm. These perforations occur in groups known as sieve-plates in the end or lateral walls. Remarkable in lacking nuclei in mature condition. Closely associated with parenchymatous companion cells with prominent nuclei.
near sieve-tube in Knolik
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