metaxylem


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to metaxylem: protoxylem

metaxylem

[¦med·ə′zī·ləm]
(botany)
Primary xylem differentiated after and distinguished from protoxylem by thicker tracheids and vessels with pitted or reticulated walls.
References in periodicals archive ?
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.
brasiliensis root extract fractions displayed a more significant reduction in the average size of the metaxylem cells compared to those grown in the presence of leaf extract fractions and the control solution (Figures 5 and 6).
Types of vascular bundles in the Monocotyledoneae and their relation to the late metaxylem conducting elements.
The vascular bundle structure of stems from both collection sites was similar, and their components had the same structural pattern: the location of the protoxylem and metaxylem, the same arrangement of the phloem like a bunch surrounded by the semicircular sclerenchyma sheath, formed of fibers.
However, with the exception of a few intact (but presumably nonfunctional) metaxylem vessels, all areas of the crown core had disintegrated with only the outline of various cells visible (Fig.
Canny J (1988) Late maturation of large metaxylem Vessels in soybean roots: significance for water and nutrient supply to the shoot.
Half the length of each root of the central cervical region was photographed and 10 central cells of the metaxylem were measured using Image Pro-Plus Software 5.
Similarly endodermal layer thickness thickness of outer tangential wall of endodermis shape and size of phloem region size and arrangement of metaxylem vessels and sclerification in the pith region showed significant (Pless than 0.
Considering the diameter of metaxylem vessels (XD), significantly greater mean diameters were observed during the rainy season in the joint analysis (Tables 3 and 4).
purpurata are of the polyarc type and have a compound endodermis with a thick layer of cells forming an "O"-shaped passage that is lined with metaxylem poles (Figure 1A).