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 ?
The following parameters were assessed: (1) time from beginning of recording to first probe, (2) time from the beginning of recording to first sieve element phase, (3) number of pathway phases, (4) number of xylem phases, (5) number of sieve element phases, (6) number of non-probing events (resting phase), (7) number of potential drops [intracellular stylet puncture), (8) duration of pathway phases, (9) duration of xylem phases, (10) duration of non-probing events, (11) duration of sieve element phases, and (12) number of A.
The time that/4, glycines spent in the first sieve element phase, the number of xylem phases and sieve element phases, and duration of xylem phases did not differ among the genotypes.
Aphids fed on 'Dowling' had the shortest duration of sieve element phases (Fig.
Sieve elements. Cells 402 (320-460) [micron]m long, 32 to 55 [micron]m wide, and 4 to 6 [micron]m wall thickness.
This cells are surrounding the sieve elements and tend to form bands slightly dilated as far as 610 [micron]m from the vascular cambium.
Sieve elements. These cells are 265 (250-286) [micron]m long, 10 to 25 [micron]m wide and 2 to 3 [micron]m wall thickness.
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 8.16 in Behnke (1990), taken from the same plant (then named D.
Sieve elements of internodal and nodal anastomoses of the monocotyledon liana Dioscorea.
Tjallingii (1990) suggested that the E1e waveform might represent the watery salivation activity that normally occurs during E1 in sieve elements. Huang et al.
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.
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.