sieve elements


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Related to sieve elements: sieve tube, Sieve cell, Sieve plates

sieve elements

[′siv ‚el·ə·məns]
(botany)
The food-conducting cells of phloem tissue; may be either sieve cells (in seedless vascular plants and gymnosperms) or sieve-tube members (in angiosperms).
References in periodicals archive ?
np] -- Number of waveform np (no penetration) per insect 1st P Min Time to first penetration (waveform C) per insect 1st E1 Min Time to first sieve element penetration with saliva secretion per insect 1st E2 Min Time to first sieve elements with sap ingestion per insect 1st Pd Min Time to waveform Pd event per insect 1st G Min Time to waveform G event per insect 1st F Min Time to waveform F event per insect 1st E1e Min Time to waveform E1e event per insect %E2 -- Percent of mealybugs produce waveform E2 %G -- Percent of mealybugs produce waveform G %E1e -- Percent of mealybugs produce waveform E1e %F -- Percent of mealybugs produce waveform F TABLE 2.
invicta the total duration of the path wave was significantly shortened as well as the time of first sieve element penetration with saliva secretion (E1), whereas the duration of the F waveform was not significantly different between the ant-tended and untended treatments.
In the one sample, and in other Dioscorea species investigated, the plastids of anastomosal sieve elements located in the node of stems are distinguished by cuneate crystals that are much smaller than those of all other sieve elements: see figure 8.
Sieve elements of internodal and nodal anastomoses of the monocotyledon liana Dioscorea.
Nevertheless, she considered it significant that they were there at all, since it meant that sieve plate pores between the sieve elements are open to entities that may be included from the outside in the translocation stream.
Before the external symptoms appear in the young leaves, virus particles are found in mature sieve elements and undergo changes in distribution and numbers such that a multiplication of the virus is indicated.
Tubular and fibrillar components of mature and differentiating sieve elements.
definitive callose: usually massive deposits in sieve elements at cessation or interruption of translocation in the sieve element.
phloem: principal food-conducting tissue of the vascular plant; composed of sieve elements, various kinds of parenchyma cells, fibers, and sclereids.
P-protein: phloem protein formerly called "slime"; in cells of seed plants, most commonly in sieve elements.
1957) had brought the once controversial matter of plasmolyzability of the sieve element into relation with other concepts concerning the connection between structure and function in the conduit of the phloem tissue.
The main topics of research at UC Santa Barbara, as at UC Davis, were the structure and development of the phloem tissue, especially the sieve element, and the appearance and fate of the virus in plant cells.