Growing Point

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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 ?
Mr Stockford, formerly of Holmfirth, will be raising cash for Growing Points as part of a crowd-funding campaign called 'From The Margins To The Mainstream.
But don't bother with summer bedding - it's probably impossible to find the growing points for many crop plants.
There are more growing points and less chance of them all being attacked by wilt.
Assuming that the growing points (Better growth environment than the root [X.
Remove the growing points from early peas which have finished flowering.
Durana differs from Regal in having more stolon growing points per unit area, shorter plant height, smaller leaflets, shorter petioles, earlier heading date, greater number of seedheads per plant, and a higher frequency of cyanogenic plants.
10 Look in growing points and under leaves on plants for greenfly or whitefly - and spray at the earliest opportunity.
If you buy tubers, plant them about three times as deep as they are wide, but since there are roots and growing points (buds) all over, there is no ``up'' or ``down'' like there is with tulip or daffodil bulbs.
Growing points can split, die off, or merge with other growing points.
It is our intention to share the growth opportunities we see in the future with our franchisees while at the same time concentrating on our abilities to serve our expanding product line through rapidly growing points of distribution including grocery and club stores as well as non-traditional venues nationwide," said Mortensen.
n Remove growing points from early peas which have finished flowering to concentrate energies on pod production.
Water hanging baskets and containers daily to stop them drying out Prune early-flowering shrubs such as lilac and deutzia Make a sowing of winter-flowering pansies for display next winter or spring Remove growing points from early peas which have finished flowering to concentrate energies on pod production Boost gladioli with a liquid feed Remove young green gooseberries for cooking or preserving, leaving enough to mature for dessert n Cut back rock plants after flowering and trim invasive plants in rock garden n Deadhead roses to encourage repeat flowering unless being grown for the colour and profusion of their hips n Take cuttings of carnations, fuchsias, herbs and shrubs to root in greenhouse