vascular bundle

[′vas·kyə·lər ′bənd·əl]

(botany)

A strandlike part of the plant vascular system containing xylem and phloem.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Vascular Bundle

in plants, the aggregate of elements of the vascular tissue. The vascular bundle appears in the sprout from the apical meristem or, more precisely, from the procam-bium. It comprises the xylem, the phloem, mechanical tissues, and cells of the living parenchyma. A vascular bundle may be complete or incomplete; that is, in the latter case it may consist of only phloem or only xylem. Dicotyledons are marked by open vascular bundles; in other words, part of the procambium is not differentiated into vascular tissue and remains in the form of cambium. Monocotyledons have closed bundles, without a cambium.

In a collateral bundle, the phloem occurs along one side of the stem, outside the xylem. The presence of phloem along both sides of the xylem makes the bundle bicollateral. A concentric bundle is one that is either amphibasal, with the xylem surrounding the phloem, or amphicribral, with the phloem surrounding the xylem. The structure of a vascular bundle may vary at different points along the stem.

In roots the vascular bundles form radial structures consisting of individual alternating sections of xylem and phloem along the radii of the vascular cylinder.

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References in periodicals archive

Abbreviations: proportion Of the adaxial epidermis (ADE%); proportion of abaxial epidermis (ABE%); proportion of chlorophyll parenchyma (PAR%); proportion of the sum of total phloem in the leaf (PHT%); proportion of the phloem in one vascular bundle (PHVB%); proportion of the bundle sheath in the vascular bundle (BS%); proportion of the vascular bundles in the leaf (VB%); proportion of the sum of total xylem in the leaf (XLT%); proportion of the phloem in one vascular bundle (XLVB%); proportion of the sum of total fibers in the leaf (FBT%), proportion of the fibers in one vascular bundle (FBFV%).

Forage potential of Urochloa genotypes by using leaf anatomy/Avaliacao do potencial forrageiro de genotipos de Urochloa por meio da anatomia foliar

a- Starch occurring near the larval chamber; b- proteins around the larval chamber; c- reducing sugar near the larval chamber; d- lipid compound detected in secretory cavity; e, f, g- oxidative stress occurs predominantly in the epidermis (e), secretory cavities (f) and in the vascular bundles near the larval chamber (g).

Perfiles estructurales, histoquimicos y fotosinteticos de las agallas inducidas por Eugeniamyia dispar (Diptera: Cecidomyiidae) en las hojas de Eugenia uniflora (Myrtaceae)

The area of the vascular bundle differed only in relation to luminosity, being greater in sun leaves, with interaction among treatments (Table 2).

Ecological anatomy of Eugenia luschnathiana (O.Berg) Klotzsch ex B.D.Jacks. (Myrtaceae) leaves in the Restinga region, state of Ceara/Anatomia ecologica foliar da Eugenia luschnathiana (O.Berg) Klotzsch ex B.D.Jacks. (Myrtaceae) na Restinga cearense

In this present study, however, the lower basic density in the nodal area was presumably attributed to its bigger bulk with less vascular bundle in comparison with the internode.

Analysis of Bambusa rigida Bamboo Culms between Internodes and Nodes: Anatomical Characteristics and Physical--Mechanical Properties

Collateral vascular bundles of second order (Figure 3i) occurred periodically in the mesophyll of the leaf blade, interspersed with smaller frequency by first-order bundles (Figure 3g).

Tropical forages: morphoanatomy of plants grown in areas with the death of pasture syndrome/Forrageiras tropicais: anatomia e morfometria de plantas cultivadas em areas com sindrome da morte de pastagens

(B) Cotyledonary petioles with three vascular bundles (lateral and median bundles).

Germination and seedling structure of Ruprechtia laxiflora Meissn. (Polygonaceae)/Germinacao dos diasporos e estrutura das plantulas de Ruprechtia laxiflora Meissn. (Polygonaceae)

Large cortical cell area, epidermal thickness, midrib thickness, vascular bundle area, metaxylem area and spongy cell area in leaves increased in all Rosa species as contamination increased in irrigation waters and R.

Physiological and Anatomical Response of Fragrant Rosa Species with Treated and Untreated Wastewater

Digitaria insularisshowed differences in stomata, vascular bundle, parenchyma, xylem/ phloem relation and trichomes that caninfluence the different glyphosate efficacy between biotypes.The herbicide resistance caused by differential absorption is complex and still need further studies.

Does sourgrass leaf anatomy influence glyphosate resistance?/A anatomia foliar de capim-amargoso influencia na resistencia ao glyphosate?

This scale is then one of few armoured scale species that are capable of piercing lignified plant cells walls like fibers and the xylem vessels in vascular bundles. Leaf vascular bundle penetration by SB has been previously reported in only 2 species of scales (Heriot 1934; Washington & Walker 1990).

Leaf penetration pattern of Aulacaspis tubercularis (Hemiptera: Diaspididae) stylet in mango

According to the early mesoscopic research about bamboo by the authors in this paper, bamboo is a kind of composite composed of a vascular bundle and matrix (thin-walled cells).

Experimental study on the flexural performance of parallel strand bamboo beams

Angiography is mainly done in cases where the injury is in close proximity to the vascular bundle (proximity wounds) and there are no obvious signs of vascular injury25 or when exact localization of vascular injury are required.

MISSED VASCULAR INJURIES