Tissue meristematic

The differentiation of cells occurs concomitantly to modifications of wall components. The nature of the pectins of the walls changes under the action of enzymes, among which esterases, secreted between the apical meristematic cells and the more basal differentiated cells. The apposition of new layers of pectins with different compositions at the inner surface of the walls is another mechanism by which the cells adapt their immediate environment. Using the 2F4 antibody, we have observed, in plant suspensions as well as in tissues, a third mechanism involved in wall modification. Numerous invaginations of the... 

Developing soybean roots and hypocotyls Localization of respiratory oxidase in meristematic and xylematic tissues Hilal et al. (12)... 

Hilal M, Castagnaro A, Moreno H, Massa EM. Specific localization of the respiratory alternative oxidase in meristematic and xylematic tissues from developing soybean roots and hypocotyls. Plant Physiol 1997 115 1499-1503. 

Toth et al. 2005), induced resistance was found only in the top blades of S.filipendula (Taylor et al. 2002). The authors concluded that valuable basal stipes are mechanically and constitutively defended, while the valuable meristematic tissues have inducible chemical defenses (Taylor et al. 2002). 

The plastid genome of modern higher plants remains well conserved, with little interspecific variation in genomic organization and coding capacity. Identical copies of the plastid genome are present in a diverse array of plastid transformation types proplastids (precursor plastids found in most plant cells and present predominantly in meristematic tissues). 

Two processes are involved in plant growth, namely, cell division and cell elongation. The former process takes place only in specialized tissue, the meristematic regions, characteristically found at root and stem tips and in the buds that form leaves and flowers. Grasses, on the other hand, have a meristematic region between the leaves and the roots. During... 

There are several kinds of plant tissues. Undifferentiated, embryonic cells found in rapidly growing regions of shoots and roots form the meristematic tissue. By differentiation, the latter yields the simple tissues, the parenchyma, collenchyma, and scleren-chyma. Parenchyma cells are among the most abundant and least specialized in plants. They give rise through further differentiation to the cambium layer, the growing layer of roots and stems. They also... 

Cloning. Asexual propagation (cloning) of plants ordinarily occurs by virture of the ability of embryonic meristematic tissue to differentiate into roots and shoots. If isolated phloem cells or other more differentiated cells are cultured, the result is often the formation of a callus, a dedifferentiated mass of cells somewhat reminiscent of embryonic cells. Under proper conditions, e.g., in a coconut milk culture and in the presence of the correct auxin-to-cytokinin ratio, some carrot root phloem cells revert to embyronic cells and develop into intact plants.99 This experiment provided proof that the differentiated carrot phloem cells... 

In plants, the meristematic tissues in general are particularly rich in potassium, as are other metabolically active regions, such as buds, young leaves, and ioot tips. Potassium deficiency may produce both gross and microscopic changes in the structure of plants. Effects of deficiency reported include leaf damage, high or low water content of leaves, decreased photosynthesis, disturbed carbohydrate metabolism, low protein content and other abnormalities. 

Algae are not as well differentiated as terrestrial vascular plants. However, tissues within individual algae can be substantially different in their ecological roles and chemical compositions. Algae can be divided into support and attachment tissues such as holdfasts, stipes, and midribs, reproductive tissues such as receptacles and sporophylls, meristematic tissues, and blade tissues, which are non-reproductive, nonmeristematic tissues that do not function in attachment or support. Within these tissue types are additional morphological divisions such as cortical and medullary tissues and tissues that differ in age. 

MERISTEMATIC Pertaining to undifferentiated plant tissues (e.g., root tips) that are characterized by regular, frequent cell division. 

Selective systemic herbicide, absorbed by roots and leaves with rapid translocation in xylem and phloem to the meristematic tissues... 

Selective systemic herbicide, rapidly absorbed by root and foliage with rapid translocation to meristematic tissue... 

Immediately inside the endodermis is the pericycle, which is typically one cell thick in angiosperms. The cells of the pericycle can divide and form a meristematic region that can produce lateral or branch roots in the region just above the root hairs. Radially inside the pericycle is the vascular tissue. The phloem generally occurs in two to eight or more strands located around the root axis. The xylem usually radiates out between the phloem strands, so water does not have to cross the phloem to reach the xylem of a young root. The tissue between the xylem and the phloem is the vascular cambium, which through cell division and differentiation produces xylem (to the inside in stems and older roots) and phloem (to the outside in stems and older roots). 

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