Growing Point

Growing Point

 

the rounded cone-shaped tip of a growing axial organ of a plant (stem or root), which consists of formative tissue (meristem). In algae, mosses, ferns, and horsetails the growing point consists of a single initial cell; in club mosses and seed plants it is made up of groups of initial cells placed in layers parallel to the surface of the organ. As a result of the division of these cells, the corpus, a mass of cells enclosed by a dome-shaped tunica, is formed. The cells of the corpus divide in various directions (volume growth), and the cells of the tunica divide predominantly perpendicularly (surface growth). It is by this process that plant growth occurs.

The growing point is sometimes called the apex, and its terminal cells are known as apical cells. The cells of the growing point that lie at its very tip, which are often designated as the promeri-stem, are converted lower on the axis into the meristem, from which true tissues are formed. At some distance from the tip of the growing point of the stem, or shoot apex, rudimentary leaves arise exogenously in the form of surface nodules. Buds are subsequently formed in the axils of these leaves. The young leaves and the shoot apex form the axillary bud. Between the rudimentary leaves there are zones of intercalary growth, which cause the shoot apex to grow. The growing point of a root, or the root apex, lacks surface appendages and is covered with a rootcap.

O. N. CHISTIAKOVA

References in periodicals archive ?
During the tour around the logistics centre, the top managers informed the media people about peculiar features of warehouse logistics, and its role as a new growing point for the national economy.
During this period the bulbs will produce a mat of white fleshy roots but the growing point should only have grown an inch or so.
Move them to pots of compost, before tipping them into their final growing point.
In June, remove the main tip/ growing point when 30cm high.
Our Growing Point Web site is the largest online agronomic library, for example.
10 It's your last chance to stop, or remove the growing point from, late chrysanthemums.
As the growing point lengthens, train it against a cane.
A CORDYLINES survive pretty low temperatures, provided that the growing point is protected.
Each time when carving he wanted to go back, eliminating all imperfections, all wear and tear, to the growing point of the first Creation, to the pure idea as it takes on form.
The growing point should be just below the surface but just above it on wetter soils to prevent rotting, each plant three feet apart.
Stop the plants after four flowering trusses have formed by pinching out the topmost growing point.
But closer inspection revealed no growing point damage.