primary xylem


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primary xylem

n.
A type of xylem tissue derived from the procambium.
References in periodicals archive ?
The central cylinder is composed of parenchymatous uniseriate pericycle and alternate bundles of primary xylem and phloem (Figure 2D).
In the root and collet region, each primary xylem bundle breaks into a median protoxylem and a pair of metaxylems, and in this portion a pith begins to appear (Figure 2E, F).
Functional (water-conducting) tracheary elements of all anthesis flower parts, including the pedicel, had helical bands and thus were part of the primary xylem.
Are there monocots in which primary xylem and early metaxylem are vesselless but metaxylem contains vessels?
The provascular tissues give rise to the primary vascular system of the plant--the primary xylem and primary phloem.
The roots were either diarch with two primary xylem strands or triarch with three primary xylem strands cleaving into two or three wide secondary xylem lobes.
Cell wall development was most pronounced in collenchyma, primary phloem, and primary xylem vessels at the first sampling date, while other tissues such as epidermis, chlorenchyma, and pith parenchyma had only thin primary walls (Fig.
In this region, tracheary elements of each primary xylem strand deviate and are distributed on the parenchymatic pith periphery (Figure 4A).
Torus-bearing pit membranes are present in secondary xylem (wood) and largely or completely absent from primary xylem.
diversifolia has a peripheral ring of 24-36 collateraL vascular bundles each with a conspicuous crescent-shaped bundle cap and a strip of densely stained cambial cells between the primary phloem and the primary xylem (Figs.
Central cylinder is composed of uniseriate parenchymatous pericycle and three strands of primary xylem and phloem (Figure 2A and B).