protoxylem

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Related to protoxylem: metaxylem

protoxylem

[¦prōd·ō′zī·ləm]

(botany)

The part of the primary xylem that differentiates from the procambium and is formed during elongation of an embryonic plant organ.

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References in periodicals archive ?

Epidermis (Epi), diameter of the root (Root diam), diameter of the vascular cylinder (VC diam), protoxylem (n), coefficient of variation (CV) and simple medium deviation (SMD).

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

Passage cells are usually aligned with protoxylem poles (Fleet 1961, Peterson & Enstone 1996), so the flow of water through them is more intense and efficient than through the other cells.

Adaptaciones estructurales de dos orquideas epifitas simpatricas (Orchidaceae) en un bosque nuboso de un campo rupestre del sureste de Brasil

Inner wall of epidermic cells are thin; parenchyma composed of polyhedral cells; collateral bundles with a set of sclerenchyma fibers are located at the periphery, each collateral bundle includes two lateral strands of phloem, a central bundle composed of small strands of phloem surrounded with phloematic fibers, a large vessel of metaxylem, several small vessels of protoxylem and xylematic parenchyma.

Caracterizacion de la anatomia foliar de especies de Astrocaryum y Hexopetion (Arecaceae)

The vascular cylinder of the cultivare is polyarc, and the average is 36 poles of protoxylem in U.

Death of pastures syndrome: tissue changes in urochloa hybrida cv. Mulato II and urochloa brizantha cv. marandu/ Sindrome da morte das pastagens: Alteracoes teciduais em Urochloa hybrida cv. Mulato II e Urochloa brizantha cv. Marandu

Reports of such structures in protoxylem of angiosperms other than Limnanthes are not evident to me, although protoxylem is little studied by means of SEM.

Wood anatomy of Brassicales: new information, new evolutionary concepts

However, Souza (2009), who examined seedlings of other eudicots, found that primary roots may present from two (diarch) to five (pentarch) protoxylem poles.

Morphoanatomy of Serjania communis Cambess. seedling (Sapindaceae)/Morfoanatomia da plantula de Serjania communis Cambess. (Sapindaceae)

The stele has 8-12 mature protoxylem elements (Figures 1(d), 1(f), and 1(g)) with two to three metaxylem elements (Figures 1(a), 1(d), 1(f), 1(g), and 1(h)), and almost all cells in the stele become lignified as sclerenchyma in aged roots (Figure 1(g)).

Anatomy and histochemistry of roots and shoots in wild rice (Zizania latifolia Griseb.)

In Figure 20, the protoxylem is mature and the center of the stele (the pith) contains a parenchymatous tissue (actually, fiber primordia).

Intervascular pit membranes in roots of two species of Osmanthus (Oleaceae)

protoxylem: First xylem cells formed in the primary xylem.

Glossary

The variation in the number of protoxylem poles varies along the primary root.

Morphology and anatomy of the seedling and the tirodendro of Calophyllum brasiliense Cambess. (Clusiaceae)/Morfoanatomia da plantula e do tirodendro de Calophyllum brasiliense Cambess. (Clusiaceae)

In addition to the anatomical description, the root diameter, expansion of the cortex, thickness of the exodermis, and diameter of vascular cylinder were measured, and the numbers of protoxylem poles and metaxylem vessel elements were quantified.

Morphoanatomical and biochemical changes in the roots of rice plants induced by plant growth-promoting microorganisms

Protoxylem, early metaxylem, and late metaxylem could also be given separate scores on this basis.