noun
definition
The plant tissue composed of totipotent cells that allows plant growth.
Examples of meristem in a Sentence
The separation of layers in the apical meristem of the root is usually very much more obvious than in that of the stem.
The branches of the stem arise by multiplication of the cells 01 the epidermis and cortex at a given spot, giving rise to a protuber ance, at the end of which an apical meristem is established.
If this division occurs by means of a localized secondary meristem connecting the cambial layers of adjacent bundles, an inlerfascicular is formed in addition to the fascicular cambium.
An ordinary cambium is scarcely ever found in the Monocotyledons, but in certain woody forms a secondary meristem is formed outside the primary bundles, and gives rise externally to a little secondary cortex, and internally to a secondary parenchyma in which are developed numerous zones of additional bundles, usually of concentric structure, with phloem surrounded by xylem.
In nearly all plants which produce secondary vascular tissues by means of a cambium there is another layer of secondary meristem arising externally to, but in quite the same fashion as, Ph II
The leaves always arise from the outer portion of the primary meristem of the plant, and the tissues of the leaf are continuous with those of the stem.
The stem is traversed by numerous collateral bundles, which have a limited growth, and are constantly replaced by new bundles developed from strands of secondary meristem.
In many Laminariaceae the thallus also grows regularly in thickness by division of its surface layer, adding to the subjacent permanent tissue and thus forming a secondary meristem.
Fin, 22.Median Longitudinal Section of the Growing, Point of the Stem of HiPPurii vulgaris, showing a many-layered meristem.
In each bundle, separating the xylem and phloem, is a layer of meristem or active formative tissue, known as cambium; by the formation of a layer of cambium between the bundles (interfascicular cambium) a complete ring is formed, and a regular periodical increase in thickness results from it by the development of xylem on the inside and phloem on the outside.
It appears at first as a simple cellular papilla of meristem, upon which an indication of two lobes soon appears.
Auxins control a number of developmental processes in plants, including cell elongation, the formation of vascular tissue and meristem organization.
The combined genetic and visualization tools are providing powerful new methods for dissecting cell-cell interactions within the developing root meristem.
The apical meristem is an area of a plant where cell division takes place at a rapid rate.
The main part of this image shows a root tip meristem cell from pea root.
Cells within a plant meristem form a complex system, and clearly possess self-organising properties.
In the study presented here, yam tubers, which were inoculated with C. gloeosporioides, developed characteristic discoloration of the meristem and cortex.